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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2022, Red Hat, Inc.
*
* Tests for Hyper-V extensions to SVM.
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/bitmap.h>
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "svm_util.h"
#include "hyperv.h"
#define L2_GUEST_STACK_SIZE 256
/* Exit to L1 from L2 with RDMSR instruction */
static inline void rdmsr_from_l2(uint32_t msr)
{
/* Currently, L1 doesn't preserve GPRs during vmexits. */
__asm__ __volatile__ ("rdmsr" : : "c"(msr) :
"rax", "rbx", "rdx", "rsi", "rdi", "r8", "r9",
"r10", "r11", "r12", "r13", "r14", "r15");
}
void l2_guest_code(void)
{
u64 unused;
GUEST_SYNC(3);
/* Exit to L1 */
vmmcall();
/* MSR-Bitmap tests */
rdmsr_from_l2(MSR_FS_BASE); /* intercepted */
rdmsr_from_l2(MSR_FS_BASE); /* intercepted */
rdmsr_from_l2(MSR_GS_BASE); /* not intercepted */
vmmcall();
rdmsr_from_l2(MSR_GS_BASE); /* intercepted */
GUEST_SYNC(5);
/* L2 TLB flush tests */
hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE |
HV_HYPERCALL_FAST_BIT, 0x0,
HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES |
HV_FLUSH_ALL_PROCESSORS);
rdmsr_from_l2(MSR_FS_BASE);
/*
* Note: hypercall status (RAX) is not preserved correctly by L1 after
* synthetic vmexit, use unchecked version.
*/
__hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE |
HV_HYPERCALL_FAST_BIT, 0x0,
HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES |
HV_FLUSH_ALL_PROCESSORS, &unused);
/* Done, exit to L1 and never come back. */
vmmcall();
}
static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm,
struct hyperv_test_pages *hv_pages,
vm_vaddr_t pgs_gpa)
{
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
struct vmcb *vmcb = svm->vmcb;
struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
GUEST_SYNC(1);
wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID);
wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa);
enable_vp_assist(hv_pages->vp_assist_gpa, hv_pages->vp_assist);
GUEST_ASSERT(svm->vmcb_gpa);
/* Prepare for L2 execution. */
generic_svm_setup(svm, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
/* L2 TLB flush setup */
hve->partition_assist_page = hv_pages->partition_assist_gpa;
hve->hv_enlightenments_control.nested_flush_hypercall = 1;
hve->hv_vm_id = 1;
hve->hv_vp_id = 1;
current_vp_assist->nested_control.features.directhypercall = 1;
*(u32 *)(hv_pages->partition_assist) = 0;
GUEST_SYNC(2);
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
GUEST_SYNC(4);
vmcb->save.rip += 3;
/* Intercept RDMSR 0xc0000100 */
vmcb->control.intercept |= 1ULL << INTERCEPT_MSR_PROT;
__set_bit(2 * (MSR_FS_BASE & 0x1fff), svm->msr + 0x800);
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
/* Enable enlightened MSR bitmap */
hve->hv_enlightenments_control.msr_bitmap = 1;
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
/* Intercept RDMSR 0xc0000101 without telling KVM about it */
__set_bit(2 * (MSR_GS_BASE & 0x1fff), svm->msr + 0x800);
/* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */
vmcb->control.clean |= HV_VMCB_NESTED_ENLIGHTENMENTS;
run_guest(vmcb, svm->vmcb_gpa);
/* Make sure we don't see SVM_EXIT_MSR here so eMSR bitmap works */
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
vmcb->save.rip += 3; /* vmcall */
/* Now tell KVM we've changed MSR-Bitmap */
vmcb->control.clean &= ~HV_VMCB_NESTED_ENLIGHTENMENTS;
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
/*
* L2 TLB flush test. First VMCALL should be handled directly by L0,
* no VMCALL exit expected.
*/
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
/* Enable synthetic vmexit */
*(u32 *)(hv_pages->partition_assist) = 1;
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == HV_SVM_EXITCODE_ENL);
GUEST_ASSERT(vmcb->control.exit_info_1 == HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH);
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
GUEST_SYNC(6);
GUEST_DONE();
}
int main(int argc, char *argv[])
{
vm_vaddr_t nested_gva = 0, hv_pages_gva = 0;
vm_vaddr_t hcall_page;
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct ucall uc;
int stage;
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_DIRECT_TLBFLUSH));
/* Create VM */
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vcpu_set_hv_cpuid(vcpu);
vcpu_alloc_svm(vm, &nested_gva);
vcpu_alloc_hyperv_test_pages(vm, &hv_pages_gva);
hcall_page = vm_vaddr_alloc_pages(vm, 1);
memset(addr_gva2hva(vm, hcall_page), 0x0, getpagesize());
vcpu_args_set(vcpu, 3, nested_gva, hv_pages_gva, addr_gva2gpa(vm, hcall_page));
vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id);
for (stage = 1;; stage++) {
vcpu_run(vcpu);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
/* NOT REACHED */
case UCALL_SYNC:
break;
case UCALL_DONE:
goto done;
default:
TEST_FAIL("Unknown ucall %lu", uc.cmd);
}
/* UCALL_SYNC is handled here. */
TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
stage, (ulong)uc.args[1]);
}
done:
kvm_vm_free(vm);
}
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