diff options
Diffstat (limited to 'tools/testing/selftests/kvm/lib/x86_64/processor.c')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/x86_64/processor.c | 1470 |
1 files changed, 782 insertions, 688 deletions
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index 683d3bdb8f6a..39c4409ef56a 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -5,94 +5,22 @@ * Copyright (C) 2018, Google LLC. */ -#define _GNU_SOURCE /* for program_invocation_name */ - #include "test_util.h" #include "kvm_util.h" -#include "../kvm_util_internal.h" #include "processor.h" -/* Minimum physical address used for virtual translation tables. */ -#define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000 - -/* Virtual translation table structure declarations */ -struct pageMapL4Entry { - uint64_t present:1; - uint64_t writable:1; - uint64_t user:1; - uint64_t write_through:1; - uint64_t cache_disable:1; - uint64_t accessed:1; - uint64_t ignored_06:1; - uint64_t page_size:1; - uint64_t ignored_11_08:4; - uint64_t address:40; - uint64_t ignored_62_52:11; - uint64_t execute_disable:1; -}; +#ifndef NUM_INTERRUPTS +#define NUM_INTERRUPTS 256 +#endif -struct pageDirectoryPointerEntry { - uint64_t present:1; - uint64_t writable:1; - uint64_t user:1; - uint64_t write_through:1; - uint64_t cache_disable:1; - uint64_t accessed:1; - uint64_t ignored_06:1; - uint64_t page_size:1; - uint64_t ignored_11_08:4; - uint64_t address:40; - uint64_t ignored_62_52:11; - uint64_t execute_disable:1; -}; +#define DEFAULT_CODE_SELECTOR 0x8 +#define DEFAULT_DATA_SELECTOR 0x10 -struct pageDirectoryEntry { - uint64_t present:1; - uint64_t writable:1; - uint64_t user:1; - uint64_t write_through:1; - uint64_t cache_disable:1; - uint64_t accessed:1; - uint64_t ignored_06:1; - uint64_t page_size:1; - uint64_t ignored_11_08:4; - uint64_t address:40; - uint64_t ignored_62_52:11; - uint64_t execute_disable:1; -}; +#define MAX_NR_CPUID_ENTRIES 100 -struct pageTableEntry { - uint64_t present:1; - uint64_t writable:1; - uint64_t user:1; - uint64_t write_through:1; - uint64_t cache_disable:1; - uint64_t accessed:1; - uint64_t dirty:1; - uint64_t reserved_07:1; - uint64_t global:1; - uint64_t ignored_11_09:3; - uint64_t address:40; - uint64_t ignored_62_52:11; - uint64_t execute_disable:1; -}; +vm_vaddr_t exception_handlers; -/* Register Dump - * - * Input Args: - * indent - Left margin indent amount - * regs - register - * - * Output Args: - * stream - Output FILE stream - * - * Return: None - * - * Dumps the state of the registers given by regs, to the FILE stream - * given by steam. - */ -void regs_dump(FILE *stream, struct kvm_regs *regs, - uint8_t indent) +static void regs_dump(FILE *stream, struct kvm_regs *regs, uint8_t indent) { fprintf(stream, "%*srax: 0x%.16llx rbx: 0x%.16llx " "rcx: 0x%.16llx rdx: 0x%.16llx\n", @@ -115,20 +43,6 @@ void regs_dump(FILE *stream, struct kvm_regs *regs, regs->rip, regs->rflags); } -/* Segment Dump - * - * Input Args: - * indent - Left margin indent amount - * segment - KVM segment - * - * Output Args: - * stream - Output FILE stream - * - * Return: None - * - * Dumps the state of the KVM segment given by segment, to the FILE stream - * given by steam. - */ static void segment_dump(FILE *stream, struct kvm_segment *segment, uint8_t indent) { @@ -146,20 +60,6 @@ static void segment_dump(FILE *stream, struct kvm_segment *segment, segment->unusable, segment->padding); } -/* dtable Dump - * - * Input Args: - * indent - Left margin indent amount - * dtable - KVM dtable - * - * Output Args: - * stream - Output FILE stream - * - * Return: None - * - * Dumps the state of the KVM dtable given by dtable, to the FILE stream - * given by steam. - */ static void dtable_dump(FILE *stream, struct kvm_dtable *dtable, uint8_t indent) { @@ -169,22 +69,7 @@ static void dtable_dump(FILE *stream, struct kvm_dtable *dtable, dtable->padding[0], dtable->padding[1], dtable->padding[2]); } -/* System Register Dump - * - * Input Args: - * indent - Left margin indent amount - * sregs - System registers - * - * Output Args: - * stream - Output FILE stream - * - * Return: None - * - * Dumps the state of the system registers given by sregs, to the FILE stream - * given by steam. - */ -void sregs_dump(FILE *stream, struct kvm_sregs *sregs, - uint8_t indent) +static void sregs_dump(FILE *stream, struct kvm_sregs *sregs, uint8_t indent) { unsigned int i; @@ -226,126 +111,230 @@ void sregs_dump(FILE *stream, struct kvm_sregs *sregs, } } -void virt_pgd_alloc(struct kvm_vm *vm, uint32_t pgd_memslot) +bool kvm_is_tdp_enabled(void) +{ + if (is_intel_cpu()) + return get_kvm_intel_param_bool("ept"); + else + return get_kvm_amd_param_bool("npt"); +} + +void virt_arch_pgd_alloc(struct kvm_vm *vm) { TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " "unknown or unsupported guest mode, mode: 0x%x", vm->mode); /* If needed, create page map l4 table. */ if (!vm->pgd_created) { - vm_paddr_t paddr = vm_phy_page_alloc(vm, - KVM_GUEST_PAGE_TABLE_MIN_PADDR, pgd_memslot); - vm->pgd = paddr; + vm->pgd = vm_alloc_page_table(vm); vm->pgd_created = true; } } -/* VM Virtual Page Map - * - * Input Args: - * vm - Virtual Machine - * vaddr - VM Virtual Address - * paddr - VM Physical Address - * pgd_memslot - Memory region slot for new virtual translation tables - * - * Output Args: None - * - * Return: None - * - * Within the VM given by vm, creates a virtual translation for the page - * starting at vaddr to the page starting at paddr. - */ -void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, - uint32_t pgd_memslot) +static void *virt_get_pte(struct kvm_vm *vm, uint64_t pt_pfn, uint64_t vaddr, + int level) +{ + uint64_t *page_table = addr_gpa2hva(vm, pt_pfn << vm->page_shift); + int index = (vaddr >> PG_LEVEL_SHIFT(level)) & 0x1ffu; + + return &page_table[index]; +} + +static uint64_t *virt_create_upper_pte(struct kvm_vm *vm, + uint64_t pt_pfn, + uint64_t vaddr, + uint64_t paddr, + int current_level, + int target_level) +{ + uint64_t *pte = virt_get_pte(vm, pt_pfn, vaddr, current_level); + + if (!(*pte & PTE_PRESENT_MASK)) { + *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK; + if (current_level == target_level) + *pte |= PTE_LARGE_MASK | (paddr & PHYSICAL_PAGE_MASK); + else + *pte |= vm_alloc_page_table(vm) & PHYSICAL_PAGE_MASK; + } else { + /* + * Entry already present. Assert that the caller doesn't want + * a hugepage at this level, and that there isn't a hugepage at + * this level. + */ + TEST_ASSERT(current_level != target_level, + "Cannot create hugepage at level: %u, vaddr: 0x%lx\n", + current_level, vaddr); + TEST_ASSERT(!(*pte & PTE_LARGE_MASK), + "Cannot create page table at level: %u, vaddr: 0x%lx\n", + current_level, vaddr); + } + return pte; +} + +void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level) +{ + const uint64_t pg_size = PG_LEVEL_SIZE(level); + uint64_t *pml4e, *pdpe, *pde; + uint64_t *pte; + + TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, + "Unknown or unsupported guest mode, mode: 0x%x", vm->mode); + + TEST_ASSERT((vaddr % pg_size) == 0, + "Virtual address not aligned,\n" + "vaddr: 0x%lx page size: 0x%lx", vaddr, pg_size); + TEST_ASSERT(sparsebit_is_set(vm->vpages_valid, (vaddr >> vm->page_shift)), + "Invalid virtual address, vaddr: 0x%lx", vaddr); + TEST_ASSERT((paddr % pg_size) == 0, + "Physical address not aligned,\n" + " paddr: 0x%lx page size: 0x%lx", paddr, pg_size); + TEST_ASSERT((paddr >> vm->page_shift) <= vm->max_gfn, + "Physical address beyond maximum supported,\n" + " paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x", + paddr, vm->max_gfn, vm->page_size); + + /* + * Allocate upper level page tables, if not already present. Return + * early if a hugepage was created. + */ + pml4e = virt_create_upper_pte(vm, vm->pgd >> vm->page_shift, + vaddr, paddr, PG_LEVEL_512G, level); + if (*pml4e & PTE_LARGE_MASK) + return; + + pdpe = virt_create_upper_pte(vm, PTE_GET_PFN(*pml4e), vaddr, paddr, PG_LEVEL_1G, level); + if (*pdpe & PTE_LARGE_MASK) + return; + + pde = virt_create_upper_pte(vm, PTE_GET_PFN(*pdpe), vaddr, paddr, PG_LEVEL_2M, level); + if (*pde & PTE_LARGE_MASK) + return; + + /* Fill in page table entry. */ + pte = virt_get_pte(vm, PTE_GET_PFN(*pde), vaddr, PG_LEVEL_4K); + TEST_ASSERT(!(*pte & PTE_PRESENT_MASK), + "PTE already present for 4k page at vaddr: 0x%lx\n", vaddr); + *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK | (paddr & PHYSICAL_PAGE_MASK); +} + +void virt_arch_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr) +{ + __virt_pg_map(vm, vaddr, paddr, PG_LEVEL_4K); +} + +void virt_map_level(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, + uint64_t nr_bytes, int level) +{ + uint64_t pg_size = PG_LEVEL_SIZE(level); + uint64_t nr_pages = nr_bytes / pg_size; + int i; + + TEST_ASSERT(nr_bytes % pg_size == 0, + "Region size not aligned: nr_bytes: 0x%lx, page size: 0x%lx", + nr_bytes, pg_size); + + for (i = 0; i < nr_pages; i++) { + __virt_pg_map(vm, vaddr, paddr, level); + + vaddr += pg_size; + paddr += pg_size; + } +} + +static uint64_t *_vm_get_page_table_entry(struct kvm_vm *vm, + struct kvm_vcpu *vcpu, + uint64_t vaddr) { uint16_t index[4]; - struct pageMapL4Entry *pml4e; + uint64_t *pml4e, *pdpe, *pde; + uint64_t *pte; + struct kvm_sregs sregs; + uint64_t rsvd_mask = 0; + + /* Set the high bits in the reserved mask. */ + if (vm->pa_bits < 52) + rsvd_mask = GENMASK_ULL(51, vm->pa_bits); + + /* + * SDM vol 3, fig 4-11 "Formats of CR3 and Paging-Structure Entries + * with 4-Level Paging and 5-Level Paging". + * If IA32_EFER.NXE = 0 and the P flag of a paging-structure entry is 1, + * the XD flag (bit 63) is reserved. + */ + vcpu_sregs_get(vcpu, &sregs); + if ((sregs.efer & EFER_NX) == 0) { + rsvd_mask |= PTE_NX_MASK; + } TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " "unknown or unsupported guest mode, mode: 0x%x", vm->mode); - - TEST_ASSERT((vaddr % vm->page_size) == 0, - "Virtual address not on page boundary,\n" - " vaddr: 0x%lx vm->page_size: 0x%x", - vaddr, vm->page_size); TEST_ASSERT(sparsebit_is_set(vm->vpages_valid, (vaddr >> vm->page_shift)), "Invalid virtual address, vaddr: 0x%lx", vaddr); - TEST_ASSERT((paddr % vm->page_size) == 0, - "Physical address not on page boundary,\n" - " paddr: 0x%lx vm->page_size: 0x%x", - paddr, vm->page_size); - TEST_ASSERT((paddr >> vm->page_shift) <= vm->max_gfn, - "Physical address beyond beyond maximum supported,\n" - " paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x", - paddr, vm->max_gfn, vm->page_size); + /* + * Based on the mode check above there are 48 bits in the vaddr, so + * shift 16 to sign extend the last bit (bit-47), + */ + TEST_ASSERT(vaddr == (((int64_t)vaddr << 16) >> 16), + "Canonical check failed. The virtual address is invalid."); index[0] = (vaddr >> 12) & 0x1ffu; index[1] = (vaddr >> 21) & 0x1ffu; index[2] = (vaddr >> 30) & 0x1ffu; index[3] = (vaddr >> 39) & 0x1ffu; - /* Allocate page directory pointer table if not present. */ pml4e = addr_gpa2hva(vm, vm->pgd); - if (!pml4e[index[3]].present) { - pml4e[index[3]].address = vm_phy_page_alloc(vm, - KVM_GUEST_PAGE_TABLE_MIN_PADDR, pgd_memslot) - >> vm->page_shift; - pml4e[index[3]].writable = true; - pml4e[index[3]].present = true; - } + TEST_ASSERT(pml4e[index[3]] & PTE_PRESENT_MASK, + "Expected pml4e to be present for gva: 0x%08lx", vaddr); + TEST_ASSERT((pml4e[index[3]] & (rsvd_mask | PTE_LARGE_MASK)) == 0, + "Unexpected reserved bits set."); + + pdpe = addr_gpa2hva(vm, PTE_GET_PFN(pml4e[index[3]]) * vm->page_size); + TEST_ASSERT(pdpe[index[2]] & PTE_PRESENT_MASK, + "Expected pdpe to be present for gva: 0x%08lx", vaddr); + TEST_ASSERT(!(pdpe[index[2]] & PTE_LARGE_MASK), + "Expected pdpe to map a pde not a 1-GByte page."); + TEST_ASSERT((pdpe[index[2]] & rsvd_mask) == 0, + "Unexpected reserved bits set."); + + pde = addr_gpa2hva(vm, PTE_GET_PFN(pdpe[index[2]]) * vm->page_size); + TEST_ASSERT(pde[index[1]] & PTE_PRESENT_MASK, + "Expected pde to be present for gva: 0x%08lx", vaddr); + TEST_ASSERT(!(pde[index[1]] & PTE_LARGE_MASK), + "Expected pde to map a pte not a 2-MByte page."); + TEST_ASSERT((pde[index[1]] & rsvd_mask) == 0, + "Unexpected reserved bits set."); + + pte = addr_gpa2hva(vm, PTE_GET_PFN(pde[index[1]]) * vm->page_size); + TEST_ASSERT(pte[index[0]] & PTE_PRESENT_MASK, + "Expected pte to be present for gva: 0x%08lx", vaddr); + + return &pte[index[0]]; +} - /* Allocate page directory table if not present. */ - struct pageDirectoryPointerEntry *pdpe; - pdpe = addr_gpa2hva(vm, pml4e[index[3]].address * vm->page_size); - if (!pdpe[index[2]].present) { - pdpe[index[2]].address = vm_phy_page_alloc(vm, - KVM_GUEST_PAGE_TABLE_MIN_PADDR, pgd_memslot) - >> vm->page_shift; - pdpe[index[2]].writable = true; - pdpe[index[2]].present = true; - } +uint64_t vm_get_page_table_entry(struct kvm_vm *vm, struct kvm_vcpu *vcpu, + uint64_t vaddr) +{ + uint64_t *pte = _vm_get_page_table_entry(vm, vcpu, vaddr); - /* Allocate page table if not present. */ - struct pageDirectoryEntry *pde; - pde = addr_gpa2hva(vm, pdpe[index[2]].address * vm->page_size); - if (!pde[index[1]].present) { - pde[index[1]].address = vm_phy_page_alloc(vm, - KVM_GUEST_PAGE_TABLE_MIN_PADDR, pgd_memslot) - >> vm->page_shift; - pde[index[1]].writable = true; - pde[index[1]].present = true; - } + return *(uint64_t *)pte; +} - /* Fill in page table entry. */ - struct pageTableEntry *pte; - pte = addr_gpa2hva(vm, pde[index[1]].address * vm->page_size); - pte[index[0]].address = paddr >> vm->page_shift; - pte[index[0]].writable = true; - pte[index[0]].present = 1; +void vm_set_page_table_entry(struct kvm_vm *vm, struct kvm_vcpu *vcpu, + uint64_t vaddr, uint64_t pte) +{ + uint64_t *new_pte = _vm_get_page_table_entry(vm, vcpu, vaddr); + + *(uint64_t *)new_pte = pte; } -/* Virtual Translation Tables Dump - * - * Input Args: - * vm - Virtual Machine - * indent - Left margin indent amount - * - * Output Args: - * stream - Output FILE stream - * - * Return: None - * - * Dumps to the FILE stream given by stream, the contents of all the - * virtual translation tables for the VM given by vm. - */ -void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent) +void virt_arch_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent) { - struct pageMapL4Entry *pml4e, *pml4e_start; - struct pageDirectoryPointerEntry *pdpe, *pdpe_start; - struct pageDirectoryEntry *pde, *pde_start; - struct pageTableEntry *pte, *pte_start; + uint64_t *pml4e, *pml4e_start; + uint64_t *pdpe, *pdpe_start; + uint64_t *pde, *pde_start; + uint64_t *pte, *pte_start; if (!vm->pgd_created) return; @@ -355,62 +344,58 @@ void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent) fprintf(stream, "%*s index hvaddr gpaddr " "addr w exec dirty\n", indent, ""); - pml4e_start = (struct pageMapL4Entry *) addr_gpa2hva(vm, - vm->pgd); + pml4e_start = (uint64_t *) addr_gpa2hva(vm, vm->pgd); for (uint16_t n1 = 0; n1 <= 0x1ffu; n1++) { pml4e = &pml4e_start[n1]; - if (!pml4e->present) + if (!(*pml4e & PTE_PRESENT_MASK)) continue; - fprintf(stream, "%*spml4e 0x%-3zx %p 0x%-12lx 0x%-10lx %u " + fprintf(stream, "%*spml4e 0x%-3zx %p 0x%-12lx 0x%-10llx %u " " %u\n", indent, "", pml4e - pml4e_start, pml4e, - addr_hva2gpa(vm, pml4e), (uint64_t) pml4e->address, - pml4e->writable, pml4e->execute_disable); + addr_hva2gpa(vm, pml4e), PTE_GET_PFN(*pml4e), + !!(*pml4e & PTE_WRITABLE_MASK), !!(*pml4e & PTE_NX_MASK)); - pdpe_start = addr_gpa2hva(vm, pml4e->address - * vm->page_size); + pdpe_start = addr_gpa2hva(vm, *pml4e & PHYSICAL_PAGE_MASK); for (uint16_t n2 = 0; n2 <= 0x1ffu; n2++) { pdpe = &pdpe_start[n2]; - if (!pdpe->present) + if (!(*pdpe & PTE_PRESENT_MASK)) continue; - fprintf(stream, "%*spdpe 0x%-3zx %p 0x%-12lx 0x%-10lx " + fprintf(stream, "%*spdpe 0x%-3zx %p 0x%-12lx 0x%-10llx " "%u %u\n", indent, "", pdpe - pdpe_start, pdpe, addr_hva2gpa(vm, pdpe), - (uint64_t) pdpe->address, pdpe->writable, - pdpe->execute_disable); + PTE_GET_PFN(*pdpe), !!(*pdpe & PTE_WRITABLE_MASK), + !!(*pdpe & PTE_NX_MASK)); - pde_start = addr_gpa2hva(vm, - pdpe->address * vm->page_size); + pde_start = addr_gpa2hva(vm, *pdpe & PHYSICAL_PAGE_MASK); for (uint16_t n3 = 0; n3 <= 0x1ffu; n3++) { pde = &pde_start[n3]; - if (!pde->present) + if (!(*pde & PTE_PRESENT_MASK)) continue; fprintf(stream, "%*spde 0x%-3zx %p " - "0x%-12lx 0x%-10lx %u %u\n", + "0x%-12lx 0x%-10llx %u %u\n", indent, "", pde - pde_start, pde, addr_hva2gpa(vm, pde), - (uint64_t) pde->address, pde->writable, - pde->execute_disable); + PTE_GET_PFN(*pde), !!(*pde & PTE_WRITABLE_MASK), + !!(*pde & PTE_NX_MASK)); - pte_start = addr_gpa2hva(vm, - pde->address * vm->page_size); + pte_start = addr_gpa2hva(vm, *pde & PHYSICAL_PAGE_MASK); for (uint16_t n4 = 0; n4 <= 0x1ffu; n4++) { pte = &pte_start[n4]; - if (!pte->present) + if (!(*pte & PTE_PRESENT_MASK)) continue; fprintf(stream, "%*spte 0x%-3zx %p " - "0x%-12lx 0x%-10lx %u %u " + "0x%-12lx 0x%-10llx %u %u " " %u 0x%-10lx\n", indent, "", pte - pte_start, pte, addr_hva2gpa(vm, pte), - (uint64_t) pte->address, - pte->writable, - pte->execute_disable, - pte->dirty, + PTE_GET_PFN(*pte), + !!(*pte & PTE_WRITABLE_MASK), + !!(*pte & PTE_NX_MASK), + !!(*pte & PTE_DIRTY_MASK), ((uint64_t) n1 << 27) | ((uint64_t) n2 << 18) | ((uint64_t) n3 << 9) @@ -421,7 +406,8 @@ void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent) } } -/* Set Unusable Segment +/* + * Set Unusable Segment * * Input Args: None * @@ -430,7 +416,7 @@ void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent) * * Return: None * - * Sets the segment register pointed to by segp to an unusable state. + * Sets the segment register pointed to by @segp to an unusable state. */ static void kvm_seg_set_unusable(struct kvm_segment *segp) { @@ -446,11 +432,12 @@ static void kvm_seg_fill_gdt_64bit(struct kvm_vm *vm, struct kvm_segment *segp) desc->limit0 = segp->limit & 0xFFFF; desc->base0 = segp->base & 0xFFFF; desc->base1 = segp->base >> 16; - desc->s = segp->s; desc->type = segp->type; + desc->s = segp->s; desc->dpl = segp->dpl; desc->p = segp->present; desc->limit1 = segp->limit >> 16; + desc->avl = segp->avl; desc->l = segp->l; desc->db = segp->db; desc->g = segp->g; @@ -460,7 +447,8 @@ static void kvm_seg_fill_gdt_64bit(struct kvm_vm *vm, struct kvm_segment *segp) } -/* Set Long Mode Flat Kernel Code Segment +/* + * Set Long Mode Flat Kernel Code Segment * * Input Args: * vm - VM whose GDT is being filled, or NULL to only write segp @@ -471,8 +459,8 @@ static void kvm_seg_fill_gdt_64bit(struct kvm_vm *vm, struct kvm_segment *segp) * * Return: None * - * Sets up the KVM segment pointed to by segp, to be a code segment - * with the selector value given by selector. + * Sets up the KVM segment pointed to by @segp, to be a code segment + * with the selector value given by @selector. */ static void kvm_seg_set_kernel_code_64bit(struct kvm_vm *vm, uint16_t selector, struct kvm_segment *segp) @@ -491,7 +479,8 @@ static void kvm_seg_set_kernel_code_64bit(struct kvm_vm *vm, uint16_t selector, kvm_seg_fill_gdt_64bit(vm, segp); } -/* Set Long Mode Flat Kernel Data Segment +/* + * Set Long Mode Flat Kernel Data Segment * * Input Args: * vm - VM whose GDT is being filled, or NULL to only write segp @@ -502,8 +491,8 @@ static void kvm_seg_set_kernel_code_64bit(struct kvm_vm *vm, uint16_t selector, * * Return: None * - * Sets up the KVM segment pointed to by segp, to be a data segment - * with the selector value given by selector. + * Sets up the KVM segment pointed to by @segp, to be a data segment + * with the selector value given by @selector. */ static void kvm_seg_set_kernel_data_64bit(struct kvm_vm *vm, uint16_t selector, struct kvm_segment *segp) @@ -521,31 +510,11 @@ static void kvm_seg_set_kernel_data_64bit(struct kvm_vm *vm, uint16_t selector, kvm_seg_fill_gdt_64bit(vm, segp); } -/* Address Guest Virtual to Guest Physical - * - * Input Args: - * vm - Virtual Machine - * gpa - VM virtual address - * - * Output Args: None - * - * Return: - * Equivalent VM physical address - * - * Translates the VM virtual address given by gva to a VM physical - * address and then locates the memory region containing the VM - * physical address, within the VM given by vm. When found, the host - * virtual address providing the memory to the vm physical address is returned. - * A TEST_ASSERT failure occurs if no region containing translated - * VM virtual address exists. - */ -vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) +vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) { uint16_t index[4]; - struct pageMapL4Entry *pml4e; - struct pageDirectoryPointerEntry *pdpe; - struct pageDirectoryEntry *pde; - struct pageTableEntry *pte; + uint64_t *pml4e, *pdpe, *pde; + uint64_t *pte; TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " "unknown or unsupported guest mode, mode: 0x%x", vm->mode); @@ -558,47 +527,42 @@ vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) if (!vm->pgd_created) goto unmapped_gva; pml4e = addr_gpa2hva(vm, vm->pgd); - if (!pml4e[index[3]].present) + if (!(pml4e[index[3]] & PTE_PRESENT_MASK)) goto unmapped_gva; - pdpe = addr_gpa2hva(vm, pml4e[index[3]].address * vm->page_size); - if (!pdpe[index[2]].present) + pdpe = addr_gpa2hva(vm, PTE_GET_PFN(pml4e[index[3]]) * vm->page_size); + if (!(pdpe[index[2]] & PTE_PRESENT_MASK)) goto unmapped_gva; - pde = addr_gpa2hva(vm, pdpe[index[2]].address * vm->page_size); - if (!pde[index[1]].present) + pde = addr_gpa2hva(vm, PTE_GET_PFN(pdpe[index[2]]) * vm->page_size); + if (!(pde[index[1]] & PTE_PRESENT_MASK)) goto unmapped_gva; - pte = addr_gpa2hva(vm, pde[index[1]].address * vm->page_size); - if (!pte[index[0]].present) + pte = addr_gpa2hva(vm, PTE_GET_PFN(pde[index[1]]) * vm->page_size); + if (!(pte[index[0]] & PTE_PRESENT_MASK)) goto unmapped_gva; - return (pte[index[0]].address * vm->page_size) + (gva & 0xfffu); + return (PTE_GET_PFN(pte[index[0]]) * vm->page_size) + (gva & ~PAGE_MASK); unmapped_gva: - TEST_ASSERT(false, "No mapping for vm virtual address, " - "gva: 0x%lx", gva); + TEST_FAIL("No mapping for vm virtual address, gva: 0x%lx", gva); exit(EXIT_FAILURE); } -static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt, int gdt_memslot, - int pgd_memslot) +static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt) { if (!vm->gdt) - vm->gdt = vm_vaddr_alloc(vm, getpagesize(), - KVM_UTIL_MIN_VADDR, gdt_memslot, pgd_memslot); + vm->gdt = vm_vaddr_alloc_page(vm); dt->base = vm->gdt; dt->limit = getpagesize(); } static void kvm_setup_tss_64bit(struct kvm_vm *vm, struct kvm_segment *segp, - int selector, int gdt_memslot, - int pgd_memslot) + int selector) { if (!vm->tss) - vm->tss = vm_vaddr_alloc(vm, getpagesize(), - KVM_UTIL_MIN_VADDR, gdt_memslot, pgd_memslot); + vm->tss = vm_vaddr_alloc_page(vm); memset(segp, 0, sizeof(*segp)); segp->base = vm->tss; @@ -609,16 +573,16 @@ static void kvm_setup_tss_64bit(struct kvm_vm *vm, struct kvm_segment *segp, kvm_seg_fill_gdt_64bit(vm, segp); } -static void vcpu_setup(struct kvm_vm *vm, int vcpuid, int pgd_memslot, int gdt_memslot) +static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu) { struct kvm_sregs sregs; /* Set mode specific system register values. */ - vcpu_sregs_get(vm, vcpuid, &sregs); + vcpu_sregs_get(vcpu, &sregs); sregs.idt.limit = 0; - kvm_setup_gdt(vm, &sregs.gdt, gdt_memslot, pgd_memslot); + kvm_setup_gdt(vm, &sregs.gdt); switch (vm->mode) { case VM_MODE_PXXV48_4K: @@ -627,322 +591,241 @@ static void vcpu_setup(struct kvm_vm *vm, int vcpuid, int pgd_memslot, int gdt_m sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX); kvm_seg_set_unusable(&sregs.ldt); - kvm_seg_set_kernel_code_64bit(vm, 0x8, &sregs.cs); - kvm_seg_set_kernel_data_64bit(vm, 0x10, &sregs.ds); - kvm_seg_set_kernel_data_64bit(vm, 0x10, &sregs.es); - kvm_setup_tss_64bit(vm, &sregs.tr, 0x18, gdt_memslot, pgd_memslot); + kvm_seg_set_kernel_code_64bit(vm, DEFAULT_CODE_SELECTOR, &sregs.cs); + kvm_seg_set_kernel_data_64bit(vm, DEFAULT_DATA_SELECTOR, &sregs.ds); + kvm_seg_set_kernel_data_64bit(vm, DEFAULT_DATA_SELECTOR, &sregs.es); + kvm_setup_tss_64bit(vm, &sregs.tr, 0x18); break; default: - TEST_ASSERT(false, "Unknown guest mode, mode: 0x%x", vm->mode); + TEST_FAIL("Unknown guest mode, mode: 0x%x", vm->mode); } sregs.cr3 = vm->pgd; - vcpu_sregs_set(vm, vcpuid, &sregs); + vcpu_sregs_set(vcpu, &sregs); } -/* Adds a vCPU with reasonable defaults (i.e., a stack) - * - * Input Args: - * vcpuid - The id of the VCPU to add to the VM. - * guest_code - The vCPU's entry point - */ -void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code) + +void __vm_xsave_require_permission(int bit, const char *name) +{ + int kvm_fd; + u64 bitmask; + long rc; + struct kvm_device_attr attr = { + .group = 0, + .attr = KVM_X86_XCOMP_GUEST_SUPP, + .addr = (unsigned long) &bitmask + }; + + TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XFD)); + + kvm_fd = open_kvm_dev_path_or_exit(); + rc = __kvm_ioctl(kvm_fd, KVM_GET_DEVICE_ATTR, &attr); + close(kvm_fd); + + if (rc == -1 && (errno == ENXIO || errno == EINVAL)) + __TEST_REQUIRE(0, "KVM_X86_XCOMP_GUEST_SUPP not supported"); + + TEST_ASSERT(rc == 0, "KVM_GET_DEVICE_ATTR(0, KVM_X86_XCOMP_GUEST_SUPP) error: %ld", rc); + + __TEST_REQUIRE(bitmask & (1ULL << bit), + "Required XSAVE feature '%s' not supported", name); + + TEST_REQUIRE(!syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit)); + + rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_GUEST_PERM, &bitmask); + TEST_ASSERT(rc == 0, "prctl(ARCH_GET_XCOMP_GUEST_PERM) error: %ld", rc); + TEST_ASSERT(bitmask & (1ULL << bit), + "prctl(ARCH_REQ_XCOMP_GUEST_PERM) failure bitmask=0x%lx", + bitmask); +} + +struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, + void *guest_code) { struct kvm_mp_state mp_state; struct kvm_regs regs; vm_vaddr_t stack_vaddr; + struct kvm_vcpu *vcpu; + stack_vaddr = vm_vaddr_alloc(vm, DEFAULT_STACK_PGS * getpagesize(), - DEFAULT_GUEST_STACK_VADDR_MIN, 0, 0); + DEFAULT_GUEST_STACK_VADDR_MIN); - /* Create VCPU */ - vm_vcpu_add(vm, vcpuid); - vcpu_setup(vm, vcpuid, 0, 0); + vcpu = __vm_vcpu_add(vm, vcpu_id); + vcpu_init_cpuid(vcpu, kvm_get_supported_cpuid()); + vcpu_setup(vm, vcpu); /* Setup guest general purpose registers */ - vcpu_regs_get(vm, vcpuid, ®s); + vcpu_regs_get(vcpu, ®s); regs.rflags = regs.rflags | 0x2; regs.rsp = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize()); regs.rip = (unsigned long) guest_code; - vcpu_regs_set(vm, vcpuid, ®s); + vcpu_regs_set(vcpu, ®s); /* Setup the MP state */ mp_state.mp_state = 0; - vcpu_set_mp_state(vm, vcpuid, &mp_state); + vcpu_mp_state_set(vcpu, &mp_state); + + return vcpu; } -/* Allocate an instance of struct kvm_cpuid2 - * - * Input Args: None - * - * Output Args: None - * - * Return: A pointer to the allocated struct. The caller is responsible - * for freeing this struct. - * - * Since kvm_cpuid2 uses a 0-length array to allow a the size of the - * array to be decided at allocation time, allocation is slightly - * complicated. This function uses a reasonable default length for - * the array and performs the appropriate allocation. - */ -static struct kvm_cpuid2 *allocate_kvm_cpuid2(void) -{ - struct kvm_cpuid2 *cpuid; - int nent = 100; - size_t size; - - size = sizeof(*cpuid); - size += nent * sizeof(struct kvm_cpuid_entry2); - cpuid = malloc(size); - if (!cpuid) { - perror("malloc"); - abort(); - } +struct kvm_vcpu *vm_arch_vcpu_recreate(struct kvm_vm *vm, uint32_t vcpu_id) +{ + struct kvm_vcpu *vcpu = __vm_vcpu_add(vm, vcpu_id); - cpuid->nent = nent; + vcpu_init_cpuid(vcpu, kvm_get_supported_cpuid()); - return cpuid; + return vcpu; } -/* KVM Supported CPUID Get - * - * Input Args: None - * - * Output Args: - * - * Return: The supported KVM CPUID - * - * Get the guest CPUID supported by KVM. - */ -struct kvm_cpuid2 *kvm_get_supported_cpuid(void) +void vcpu_arch_free(struct kvm_vcpu *vcpu) +{ + if (vcpu->cpuid) + free(vcpu->cpuid); +} + +const struct kvm_cpuid2 *kvm_get_supported_cpuid(void) { static struct kvm_cpuid2 *cpuid; - int ret; int kvm_fd; if (cpuid) return cpuid; - cpuid = allocate_kvm_cpuid2(); - kvm_fd = open(KVM_DEV_PATH, O_RDONLY); - if (kvm_fd < 0) - exit(KSFT_SKIP); + cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES); + kvm_fd = open_kvm_dev_path_or_exit(); - ret = ioctl(kvm_fd, KVM_GET_SUPPORTED_CPUID, cpuid); - TEST_ASSERT(ret == 0, "KVM_GET_SUPPORTED_CPUID failed %d %d\n", - ret, errno); + kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_CPUID, cpuid); close(kvm_fd); return cpuid; } -/* Locate a cpuid entry. - * - * Input Args: - * cpuid: The cpuid. - * function: The function of the cpuid entry to find. - * - * Output Args: None - * - * Return: A pointer to the cpuid entry. Never returns NULL. - */ -struct kvm_cpuid_entry2 * -kvm_get_supported_cpuid_index(uint32_t function, uint32_t index) +bool kvm_cpuid_has(const struct kvm_cpuid2 *cpuid, + struct kvm_x86_cpu_feature feature) { - struct kvm_cpuid2 *cpuid; - struct kvm_cpuid_entry2 *entry = NULL; + const struct kvm_cpuid_entry2 *entry; int i; - cpuid = kvm_get_supported_cpuid(); for (i = 0; i < cpuid->nent; i++) { - if (cpuid->entries[i].function == function && - cpuid->entries[i].index == index) { - entry = &cpuid->entries[i]; - break; - } + entry = &cpuid->entries[i]; + + /* + * The output registers in kvm_cpuid_entry2 are in alphabetical + * order, but kvm_x86_cpu_feature matches that mess, so yay + * pointer shenanigans! + */ + if (entry->function == feature.function && + entry->index == feature.index) + return (&entry->eax)[feature.reg] & BIT(feature.bit); } - TEST_ASSERT(entry, "Guest CPUID entry not found: (EAX=%x, ECX=%x).", - function, index); - return entry; + return false; } -/* VM VCPU CPUID Set - * - * Input Args: - * vm - Virtual Machine - * vcpuid - VCPU id - * cpuid - The CPUID values to set. - * - * Output Args: None - * - * Return: void - * - * Set the VCPU's CPUID. - */ -void vcpu_set_cpuid(struct kvm_vm *vm, - uint32_t vcpuid, struct kvm_cpuid2 *cpuid) +uint64_t kvm_get_feature_msr(uint64_t msr_index) { - struct vcpu *vcpu = vcpu_find(vm, vcpuid); - int rc; + struct { + struct kvm_msrs header; + struct kvm_msr_entry entry; + } buffer = {}; + int r, kvm_fd; - TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid); + buffer.header.nmsrs = 1; + buffer.entry.index = msr_index; + kvm_fd = open_kvm_dev_path_or_exit(); - rc = ioctl(vcpu->fd, KVM_SET_CPUID2, cpuid); - TEST_ASSERT(rc == 0, "KVM_SET_CPUID2 failed, rc: %i errno: %i", - rc, errno); + r = __kvm_ioctl(kvm_fd, KVM_GET_MSRS, &buffer.header); + TEST_ASSERT(r == 1, KVM_IOCTL_ERROR(KVM_GET_MSRS, r)); + close(kvm_fd); + return buffer.entry.data; } -/* Create a VM with reasonable defaults - * - * Input Args: - * vcpuid - The id of the single VCPU to add to the VM. - * extra_mem_pages - The size of extra memories to add (this will - * decide how much extra space we will need to - * setup the page tables using mem slot 0) - * guest_code - The vCPU's entry point - * - * Output Args: None - * - * Return: - * Pointer to opaque structure that describes the created VM. - */ -struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages, - void *guest_code) +void vcpu_init_cpuid(struct kvm_vcpu *vcpu, const struct kvm_cpuid2 *cpuid) { - struct kvm_vm *vm; - /* - * For x86 the maximum page table size for a memory region - * will be when only 4K pages are used. In that case the - * total extra size for page tables (for extra N pages) will - * be: N/512+N/512^2+N/512^3+... which is definitely smaller - * than N/512*2. - */ - uint64_t extra_pg_pages = extra_mem_pages / 512 * 2; + TEST_ASSERT(cpuid != vcpu->cpuid, "@cpuid can't be the vCPU's CPUID"); - /* Create VM */ - vm = vm_create(VM_MODE_DEFAULT, - DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, - O_RDWR); + /* Allow overriding the default CPUID. */ + if (vcpu->cpuid && vcpu->cpuid->nent < cpuid->nent) { + free(vcpu->cpuid); + vcpu->cpuid = NULL; + } - /* Setup guest code */ - kvm_vm_elf_load(vm, program_invocation_name, 0, 0); + if (!vcpu->cpuid) + vcpu->cpuid = allocate_kvm_cpuid2(cpuid->nent); - /* Setup IRQ Chip */ - vm_create_irqchip(vm); + memcpy(vcpu->cpuid, cpuid, kvm_cpuid2_size(cpuid->nent)); + vcpu_set_cpuid(vcpu); +} - /* Add the first vCPU. */ - vm_vcpu_add_default(vm, vcpuid, guest_code); +void vcpu_set_cpuid_maxphyaddr(struct kvm_vcpu *vcpu, uint8_t maxphyaddr) +{ + struct kvm_cpuid_entry2 *entry = vcpu_get_cpuid_entry(vcpu, 0x80000008); - return vm; + entry->eax = (entry->eax & ~0xff) | maxphyaddr; + vcpu_set_cpuid(vcpu); } -/* VCPU Get MSR - * - * Input Args: - * vm - Virtual Machine - * vcpuid - VCPU ID - * msr_index - Index of MSR - * - * Output Args: None - * - * Return: On success, value of the MSR. On failure a TEST_ASSERT is produced. - * - * Get value of MSR for VCPU. - */ -uint64_t vcpu_get_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index) +void vcpu_clear_cpuid_entry(struct kvm_vcpu *vcpu, uint32_t function) +{ + struct kvm_cpuid_entry2 *entry = vcpu_get_cpuid_entry(vcpu, function); + + entry->eax = 0; + entry->ebx = 0; + entry->ecx = 0; + entry->edx = 0; + vcpu_set_cpuid(vcpu); +} + +void vcpu_set_or_clear_cpuid_feature(struct kvm_vcpu *vcpu, + struct kvm_x86_cpu_feature feature, + bool set) +{ + struct kvm_cpuid_entry2 *entry; + u32 *reg; + + entry = __vcpu_get_cpuid_entry(vcpu, feature.function, feature.index); + reg = (&entry->eax) + feature.reg; + + if (set) + *reg |= BIT(feature.bit); + else + *reg &= ~BIT(feature.bit); + + vcpu_set_cpuid(vcpu); +} + +uint64_t vcpu_get_msr(struct kvm_vcpu *vcpu, uint64_t msr_index) { - struct vcpu *vcpu = vcpu_find(vm, vcpuid); struct { struct kvm_msrs header; struct kvm_msr_entry entry; } buffer = {}; - int r; - TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid); buffer.header.nmsrs = 1; buffer.entry.index = msr_index; - r = ioctl(vcpu->fd, KVM_GET_MSRS, &buffer.header); - TEST_ASSERT(r == 1, "KVM_GET_MSRS IOCTL failed,\n" - " rc: %i errno: %i", r, errno); + + vcpu_msrs_get(vcpu, &buffer.header); return buffer.entry.data; } -/* _VCPU Set MSR - * - * Input Args: - * vm - Virtual Machine - * vcpuid - VCPU ID - * msr_index - Index of MSR - * msr_value - New value of MSR - * - * Output Args: None - * - * Return: The result of KVM_SET_MSRS. - * - * Sets the value of an MSR for the given VCPU. - */ -int _vcpu_set_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index, - uint64_t msr_value) +int _vcpu_set_msr(struct kvm_vcpu *vcpu, uint64_t msr_index, uint64_t msr_value) { - struct vcpu *vcpu = vcpu_find(vm, vcpuid); struct { struct kvm_msrs header; struct kvm_msr_entry entry; } buffer = {}; - int r; - TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid); memset(&buffer, 0, sizeof(buffer)); buffer.header.nmsrs = 1; buffer.entry.index = msr_index; buffer.entry.data = msr_value; - r = ioctl(vcpu->fd, KVM_SET_MSRS, &buffer.header); - return r; -} - -/* VCPU Set MSR - * - * Input Args: - * vm - Virtual Machine - * vcpuid - VCPU ID - * msr_index - Index of MSR - * msr_value - New value of MSR - * - * Output Args: None - * - * Return: On success, nothing. On failure a TEST_ASSERT is produced. - * - * Set value of MSR for VCPU. - */ -void vcpu_set_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index, - uint64_t msr_value) -{ - int r; - r = _vcpu_set_msr(vm, vcpuid, msr_index, msr_value); - TEST_ASSERT(r == 1, "KVM_SET_MSRS IOCTL failed,\n" - " rc: %i errno: %i", r, errno); + return __vcpu_ioctl(vcpu, KVM_SET_MSRS, &buffer.header); } -/* VM VCPU Args Set - * - * Input Args: - * vm - Virtual Machine - * vcpuid - VCPU ID - * num - number of arguments - * ... - arguments, each of type uint64_t - * - * Output Args: None - * - * Return: None - * - * Sets the first num function input arguments to the values - * given as variable args. Each of the variable args is expected to - * be of type uint64_t. - */ -void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...) +void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...) { va_list ap; struct kvm_regs regs; @@ -952,7 +835,7 @@ void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...) num); va_start(ap, num); - vcpu_regs_get(vm, vcpuid, ®s); + vcpu_regs_get(vcpu, ®s); if (num >= 1) regs.rdi = va_arg(ap, uint64_t); @@ -972,102 +855,112 @@ void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...) if (num >= 6) regs.r9 = va_arg(ap, uint64_t); - vcpu_regs_set(vm, vcpuid, ®s); + vcpu_regs_set(vcpu, ®s); va_end(ap); } -/* - * VM VCPU Dump - * - * Input Args: - * vm - Virtual Machine - * vcpuid - VCPU ID - * indent - Left margin indent amount - * - * Output Args: - * stream - Output FILE stream - * - * Return: None - * - * Dumps the current state of the VCPU specified by vcpuid, within the VM - * given by vm, to the FILE stream given by stream. - */ -void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent) +void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent) { struct kvm_regs regs; struct kvm_sregs sregs; - fprintf(stream, "%*scpuid: %u\n", indent, "", vcpuid); + fprintf(stream, "%*svCPU ID: %u\n", indent, "", vcpu->id); fprintf(stream, "%*sregs:\n", indent + 2, ""); - vcpu_regs_get(vm, vcpuid, ®s); + vcpu_regs_get(vcpu, ®s); regs_dump(stream, ®s, indent + 4); fprintf(stream, "%*ssregs:\n", indent + 2, ""); - vcpu_sregs_get(vm, vcpuid, &sregs); + vcpu_sregs_get(vcpu, &sregs); sregs_dump(stream, &sregs, indent + 4); } -struct kvm_x86_state { - struct kvm_vcpu_events events; - struct kvm_mp_state mp_state; - struct kvm_regs regs; - struct kvm_xsave xsave; - struct kvm_xcrs xcrs; - struct kvm_sregs sregs; - struct kvm_debugregs debugregs; - union { - struct kvm_nested_state nested; - char nested_[16384]; - }; - struct kvm_msrs msrs; -}; - -static int kvm_get_num_msrs_fd(int kvm_fd) +static struct kvm_msr_list *__kvm_get_msr_index_list(bool feature_msrs) { + struct kvm_msr_list *list; struct kvm_msr_list nmsrs; - int r; + int kvm_fd, r; + + kvm_fd = open_kvm_dev_path_or_exit(); nmsrs.nmsrs = 0; - r = ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, &nmsrs); - TEST_ASSERT(r == -1 && errno == E2BIG, "Unexpected result from KVM_GET_MSR_INDEX_LIST probe, r: %i", - r); + if (!feature_msrs) + r = __kvm_ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, &nmsrs); + else + r = __kvm_ioctl(kvm_fd, KVM_GET_MSR_FEATURE_INDEX_LIST, &nmsrs); + + TEST_ASSERT(r == -1 && errno == E2BIG, + "Expected -E2BIG, got rc: %i errno: %i (%s)", + r, errno, strerror(errno)); + + list = malloc(sizeof(*list) + nmsrs.nmsrs * sizeof(list->indices[0])); + TEST_ASSERT(list, "-ENOMEM when allocating MSR index list"); + list->nmsrs = nmsrs.nmsrs; + + if (!feature_msrs) + kvm_ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, list); + else + kvm_ioctl(kvm_fd, KVM_GET_MSR_FEATURE_INDEX_LIST, list); + close(kvm_fd); - return nmsrs.nmsrs; + TEST_ASSERT(list->nmsrs == nmsrs.nmsrs, + "Number of MSRs in list changed, was %d, now %d", + nmsrs.nmsrs, list->nmsrs); + return list; } -static int kvm_get_num_msrs(struct kvm_vm *vm) +const struct kvm_msr_list *kvm_get_msr_index_list(void) { - return kvm_get_num_msrs_fd(vm->kvm_fd); + static const struct kvm_msr_list *list; + + if (!list) + list = __kvm_get_msr_index_list(false); + return list; } -struct kvm_msr_list *kvm_get_msr_index_list(void) + +const struct kvm_msr_list *kvm_get_feature_msr_index_list(void) { - struct kvm_msr_list *list; - int nmsrs, r, kvm_fd; + static const struct kvm_msr_list *list; - kvm_fd = open(KVM_DEV_PATH, O_RDONLY); - if (kvm_fd < 0) - exit(KSFT_SKIP); + if (!list) + list = __kvm_get_msr_index_list(true); + return list; +} - nmsrs = kvm_get_num_msrs_fd(kvm_fd); - list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0])); - list->nmsrs = nmsrs; - r = ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, list); - close(kvm_fd); +bool kvm_msr_is_in_save_restore_list(uint32_t msr_index) +{ + const struct kvm_msr_list *list = kvm_get_msr_index_list(); + int i; - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_MSR_INDEX_LIST, r: %i", - r); + for (i = 0; i < list->nmsrs; ++i) { + if (list->indices[i] == msr_index) + return true; + } - return list; + return false; } -struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid) +static void vcpu_save_xsave_state(struct kvm_vcpu *vcpu, + struct kvm_x86_state *state) { - struct vcpu *vcpu = vcpu_find(vm, vcpuid); - struct kvm_msr_list *list; + int size = vm_check_cap(vcpu->vm, KVM_CAP_XSAVE2); + + if (size) { + state->xsave = malloc(size); + vcpu_xsave2_get(vcpu, state->xsave); + } else { + state->xsave = malloc(sizeof(struct kvm_xsave)); + vcpu_xsave_get(vcpu, state->xsave); + } +} + +struct kvm_x86_state *vcpu_save_state(struct kvm_vcpu *vcpu) +{ + const struct kvm_msr_list *msr_list = kvm_get_msr_index_list(); struct kvm_x86_state *state; - int nmsrs, r, i; + int i; + static int nested_size = -1; if (nested_size == -1) { @@ -1083,143 +976,90 @@ struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid) * kernel with KVM_RUN. Complete IO prior to migrating state * to a new VM. */ - vcpu_run_complete_io(vm, vcpuid); - - nmsrs = kvm_get_num_msrs(vm); - list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0])); - list->nmsrs = nmsrs; - r = ioctl(vm->kvm_fd, KVM_GET_MSR_INDEX_LIST, list); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_MSR_INDEX_LIST, r: %i", - r); - - state = malloc(sizeof(*state) + nmsrs * sizeof(state->msrs.entries[0])); - r = ioctl(vcpu->fd, KVM_GET_VCPU_EVENTS, &state->events); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_VCPU_EVENTS, r: %i", - r); - - r = ioctl(vcpu->fd, KVM_GET_MP_STATE, &state->mp_state); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_MP_STATE, r: %i", - r); - - r = ioctl(vcpu->fd, KVM_GET_REGS, &state->regs); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_REGS, r: %i", - r); - - r = ioctl(vcpu->fd, KVM_GET_XSAVE, &state->xsave); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_XSAVE, r: %i", - r); - - if (kvm_check_cap(KVM_CAP_XCRS)) { - r = ioctl(vcpu->fd, KVM_GET_XCRS, &state->xcrs); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_XCRS, r: %i", - r); - } + vcpu_run_complete_io(vcpu); + + state = malloc(sizeof(*state) + msr_list->nmsrs * sizeof(state->msrs.entries[0])); + + vcpu_events_get(vcpu, &state->events); + vcpu_mp_state_get(vcpu, &state->mp_state); + vcpu_regs_get(vcpu, &state->regs); + vcpu_save_xsave_state(vcpu, state); - r = ioctl(vcpu->fd, KVM_GET_SREGS, &state->sregs); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_SREGS, r: %i", - r); + if (kvm_has_cap(KVM_CAP_XCRS)) + vcpu_xcrs_get(vcpu, &state->xcrs); + + vcpu_sregs_get(vcpu, &state->sregs); if (nested_size) { state->nested.size = sizeof(state->nested_); - r = ioctl(vcpu->fd, KVM_GET_NESTED_STATE, &state->nested); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_NESTED_STATE, r: %i", - r); + + vcpu_nested_state_get(vcpu, &state->nested); TEST_ASSERT(state->nested.size <= nested_size, - "Nested state size too big, %i (KVM_CHECK_CAP gave %i)", - state->nested.size, nested_size); - } else + "Nested state size too big, %i (KVM_CHECK_CAP gave %i)", + state->nested.size, nested_size); + } else { state->nested.size = 0; + } - state->msrs.nmsrs = nmsrs; - for (i = 0; i < nmsrs; i++) - state->msrs.entries[i].index = list->indices[i]; - r = ioctl(vcpu->fd, KVM_GET_MSRS, &state->msrs); - TEST_ASSERT(r == nmsrs, "Unexpected result from KVM_GET_MSRS, r: %i (failed MSR was 0x%x)", - r, r == nmsrs ? -1 : list->indices[r]); + state->msrs.nmsrs = msr_list->nmsrs; + for (i = 0; i < msr_list->nmsrs; i++) + state->msrs.entries[i].index = msr_list->indices[i]; + vcpu_msrs_get(vcpu, &state->msrs); - r = ioctl(vcpu->fd, KVM_GET_DEBUGREGS, &state->debugregs); - TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_DEBUGREGS, r: %i", - r); + vcpu_debugregs_get(vcpu, &state->debugregs); - free(list); return state; } -void vcpu_load_state(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_x86_state *state) +void vcpu_load_state(struct kvm_vcpu *vcpu, struct kvm_x86_state *state) { - struct vcpu *vcpu = vcpu_find(vm, vcpuid); - int r; - - r = ioctl(vcpu->fd, KVM_SET_XSAVE, &state->xsave); - TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_XSAVE, r: %i", - r); - - if (kvm_check_cap(KVM_CAP_XCRS)) { - r = ioctl(vcpu->fd, KVM_SET_XCRS, &state->xcrs); - TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_XCRS, r: %i", - r); - } - - r = ioctl(vcpu->fd, KVM_SET_SREGS, &state->sregs); - TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_SREGS, r: %i", - r); - - r = ioctl(vcpu->fd, KVM_SET_MSRS, &state->msrs); - TEST_ASSERT(r == state->msrs.nmsrs, "Unexpected result from KVM_SET_MSRS, r: %i (failed at %x)", - r, r == state->msrs.nmsrs ? -1 : state->msrs.entries[r].index); + vcpu_sregs_set(vcpu, &state->sregs); + vcpu_msrs_set(vcpu, &state->msrs); - r = ioctl(vcpu->fd, KVM_SET_VCPU_EVENTS, &state->events); - TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_VCPU_EVENTS, r: %i", - r); + if (kvm_has_cap(KVM_CAP_XCRS)) + vcpu_xcrs_set(vcpu, &state->xcrs); - r = ioctl(vcpu->fd, KVM_SET_MP_STATE, &state->mp_state); - TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_MP_STATE, r: %i", - r); + vcpu_xsave_set(vcpu, state->xsave); + vcpu_events_set(vcpu, &state->events); + vcpu_mp_state_set(vcpu, &state->mp_state); + vcpu_debugregs_set(vcpu, &state->debugregs); + vcpu_regs_set(vcpu, &state->regs); - r = ioctl(vcpu->fd, KVM_SET_DEBUGREGS, &state->debugregs); - TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_DEBUGREGS, r: %i", - r); - - r = ioctl(vcpu->fd, KVM_SET_REGS, &state->regs); - TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_REGS, r: %i", - r); - - if (state->nested.size) { - r = ioctl(vcpu->fd, KVM_SET_NESTED_STATE, &state->nested); - TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_NESTED_STATE, r: %i", - r); - } + if (state->nested.size) + vcpu_nested_state_set(vcpu, &state->nested); } -bool is_intel_cpu(void) +void kvm_x86_state_cleanup(struct kvm_x86_state *state) { - int eax, ebx, ecx, edx; - const uint32_t *chunk; - const int leaf = 0; + free(state->xsave); + free(state); +} - __asm__ __volatile__( - "cpuid" - : /* output */ "=a"(eax), "=b"(ebx), - "=c"(ecx), "=d"(edx) - : /* input */ "0"(leaf), "2"(0)); +static bool cpu_vendor_string_is(const char *vendor) +{ + const uint32_t *chunk = (const uint32_t *)vendor; + uint32_t eax, ebx, ecx, edx; - chunk = (const uint32_t *)("GenuineIntel"); + cpuid(0, &eax, &ebx, &ecx, &edx); return (ebx == chunk[0] && edx == chunk[1] && ecx == chunk[2]); } -uint32_t kvm_get_cpuid_max_basic(void) +bool is_intel_cpu(void) { - return kvm_get_supported_cpuid_entry(0)->eax; + return cpu_vendor_string_is("GenuineIntel"); } -uint32_t kvm_get_cpuid_max_extended(void) +/* + * Exclude early K5 samples with a vendor string of "AMDisbetter!" + */ +bool is_amd_cpu(void) { - return kvm_get_supported_cpuid_entry(0x80000000)->eax; + return cpu_vendor_string_is("AuthenticAMD"); } void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits) { - struct kvm_cpuid_entry2 *entry; + const struct kvm_cpuid_entry2 *entry; bool pae; /* SDM 4.1.4 */ @@ -1233,3 +1073,257 @@ void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits) *va_bits = (entry->eax >> 8) & 0xff; } } + +struct idt_entry { + uint16_t offset0; + uint16_t selector; + uint16_t ist : 3; + uint16_t : 5; + uint16_t type : 4; + uint16_t : 1; + uint16_t dpl : 2; + uint16_t p : 1; + uint16_t offset1; + uint32_t offset2; uint32_t reserved; +}; + +static void set_idt_entry(struct kvm_vm *vm, int vector, unsigned long addr, + int dpl, unsigned short selector) +{ + struct idt_entry *base = + (struct idt_entry *)addr_gva2hva(vm, vm->idt); + struct idt_entry *e = &base[vector]; + + memset(e, 0, sizeof(*e)); + e->offset0 = addr; + e->selector = selector; + e->ist = 0; + e->type = 14; + e->dpl = dpl; + e->p = 1; + e->offset1 = addr >> 16; + e->offset2 = addr >> 32; +} + + +static bool kvm_fixup_exception(struct ex_regs *regs) +{ + if (regs->r9 != KVM_EXCEPTION_MAGIC || regs->rip != regs->r10) + return false; + + if (regs->vector == DE_VECTOR) + return false; + + regs->rip = regs->r11; + regs->r9 = regs->vector; + return true; +} + +void kvm_exit_unexpected_vector(uint32_t value) +{ + ucall(UCALL_UNHANDLED, 1, value); +} + +void route_exception(struct ex_regs *regs) +{ + typedef void(*handler)(struct ex_regs *); + handler *handlers = (handler *)exception_handlers; + + if (handlers && handlers[regs->vector]) { + handlers[regs->vector](regs); + return; + } + + if (kvm_fixup_exception(regs)) + return; + + kvm_exit_unexpected_vector(regs->vector); +} + +void vm_init_descriptor_tables(struct kvm_vm *vm) +{ + extern void *idt_handlers; + int i; + + vm->idt = vm_vaddr_alloc_page(vm); + vm->handlers = vm_vaddr_alloc_page(vm); + /* Handlers have the same address in both address spaces.*/ + for (i = 0; i < NUM_INTERRUPTS; i++) + set_idt_entry(vm, i, (unsigned long)(&idt_handlers)[i], 0, + DEFAULT_CODE_SELECTOR); +} + +void vcpu_init_descriptor_tables(struct kvm_vcpu *vcpu) +{ + struct kvm_vm *vm = vcpu->vm; + struct kvm_sregs sregs; + + vcpu_sregs_get(vcpu, &sregs); + sregs.idt.base = vm->idt; + sregs.idt.limit = NUM_INTERRUPTS * sizeof(struct idt_entry) - 1; + sregs.gdt.base = vm->gdt; + sregs.gdt.limit = getpagesize() - 1; + kvm_seg_set_kernel_data_64bit(NULL, DEFAULT_DATA_SELECTOR, &sregs.gs); + vcpu_sregs_set(vcpu, &sregs); + *(vm_vaddr_t *)addr_gva2hva(vm, (vm_vaddr_t)(&exception_handlers)) = vm->handlers; +} + +void vm_install_exception_handler(struct kvm_vm *vm, int vector, + void (*handler)(struct ex_regs *)) +{ + vm_vaddr_t *handlers = (vm_vaddr_t *)addr_gva2hva(vm, vm->handlers); + + handlers[vector] = (vm_vaddr_t)handler; +} + +void assert_on_unhandled_exception(struct kvm_vcpu *vcpu) +{ + struct ucall uc; + + if (get_ucall(vcpu, &uc) == UCALL_UNHANDLED) { + uint64_t vector = uc.args[0]; + + TEST_FAIL("Unexpected vectored event in guest (vector:0x%lx)", + vector); + } +} + +const struct kvm_cpuid_entry2 *get_cpuid_entry(const struct kvm_cpuid2 *cpuid, + uint32_t function, uint32_t index) +{ + int i; + + for (i = 0; i < cpuid->nent; i++) { + if (cpuid->entries[i].function == function && + cpuid->entries[i].index == index) + return &cpuid->entries[i]; + } + + TEST_FAIL("CPUID function 0x%x index 0x%x not found ", function, index); + + return NULL; +} + +uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2, + uint64_t a3) +{ + uint64_t r; + + asm volatile("vmcall" + : "=a"(r) + : "a"(nr), "b"(a0), "c"(a1), "d"(a2), "S"(a3)); + return r; +} + +const struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void) +{ + static struct kvm_cpuid2 *cpuid; + int kvm_fd; + + if (cpuid) + return cpuid; + + cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES); + kvm_fd = open_kvm_dev_path_or_exit(); + + kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, cpuid); + + close(kvm_fd); + return cpuid; +} + +void vcpu_set_hv_cpuid(struct kvm_vcpu *vcpu) +{ + static struct kvm_cpuid2 *cpuid_full; + const struct kvm_cpuid2 *cpuid_sys, *cpuid_hv; + int i, nent = 0; + + if (!cpuid_full) { + cpuid_sys = kvm_get_supported_cpuid(); + cpuid_hv = kvm_get_supported_hv_cpuid(); + + cpuid_full = allocate_kvm_cpuid2(cpuid_sys->nent + cpuid_hv->nent); + if (!cpuid_full) { + perror("malloc"); + abort(); + } + + /* Need to skip KVM CPUID leaves 0x400000xx */ + for (i = 0; i < cpuid_sys->nent; i++) { + if (cpuid_sys->entries[i].function >= 0x40000000 && + cpuid_sys->entries[i].function < 0x40000100) + continue; + cpuid_full->entries[nent] = cpuid_sys->entries[i]; + nent++; + } + + memcpy(&cpuid_full->entries[nent], cpuid_hv->entries, + cpuid_hv->nent * sizeof(struct kvm_cpuid_entry2)); + cpuid_full->nent = nent + cpuid_hv->nent; + } + + vcpu_init_cpuid(vcpu, cpuid_full); +} + +const struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vcpu *vcpu) +{ + struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES); + + vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, cpuid); + + return cpuid; +} + +unsigned long vm_compute_max_gfn(struct kvm_vm *vm) +{ + const unsigned long num_ht_pages = 12 << (30 - vm->page_shift); /* 12 GiB */ + unsigned long ht_gfn, max_gfn, max_pfn; + uint32_t eax, ebx, ecx, edx, max_ext_leaf; + + max_gfn = (1ULL << (vm->pa_bits - vm->page_shift)) - 1; + + /* Avoid reserved HyperTransport region on AMD processors. */ + if (!is_amd_cpu()) + return max_gfn; + + /* On parts with <40 physical address bits, the area is fully hidden */ + if (vm->pa_bits < 40) + return max_gfn; + + /* Before family 17h, the HyperTransport area is just below 1T. */ + ht_gfn = (1 << 28) - num_ht_pages; + cpuid(1, &eax, &ebx, &ecx, &edx); + if (x86_family(eax) < 0x17) + goto done; + + /* + * Otherwise it's at the top of the physical address space, possibly + * reduced due to SME by bits 11:6 of CPUID[0x8000001f].EBX. Use + * the old conservative value if MAXPHYADDR is not enumerated. + */ + cpuid(0x80000000, &eax, &ebx, &ecx, &edx); + max_ext_leaf = eax; + if (max_ext_leaf < 0x80000008) + goto done; + + cpuid(0x80000008, &eax, &ebx, &ecx, &edx); + max_pfn = (1ULL << ((eax & 0xff) - vm->page_shift)) - 1; + if (max_ext_leaf >= 0x8000001f) { + cpuid(0x8000001f, &eax, &ebx, &ecx, &edx); + max_pfn >>= (ebx >> 6) & 0x3f; + } + + ht_gfn = max_pfn - num_ht_pages; +done: + return min(max_gfn, ht_gfn - 1); +} + +/* Returns true if kvm_intel was loaded with unrestricted_guest=1. */ +bool vm_is_unrestricted_guest(struct kvm_vm *vm) +{ + /* Ensure that a KVM vendor-specific module is loaded. */ + if (vm == NULL) + close(open_kvm_dev_path_or_exit()); + + return get_kvm_intel_param_bool("unrestricted_guest"); +} |