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-rw-r--r--arch/powerpc/include/asm/kvm_book3s.h4
-rw-r--r--arch/powerpc/include/asm/kvm_book3s_64.h31
-rw-r--r--arch/powerpc/include/asm/kvm_host.h16
-rw-r--r--arch/powerpc/include/asm/reg.h3
-rw-r--r--arch/powerpc/kvm/Kconfig1
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_hv.c290
-rw-r--r--arch/powerpc/kvm/book3s_hv.c25
-rw-r--r--arch/powerpc/kvm/book3s_hv_rm_mmu.c140
-rw-r--r--arch/powerpc/kvm/book3s_hv_rmhandlers.S49
-rw-r--r--arch/powerpc/kvm/powerpc.c3
-rw-r--r--arch/powerpc/mm/hugetlbpage.c2
11 files changed, 499 insertions, 65 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index 3a9e51f43397..9240cebf8bad 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -143,6 +143,10 @@ extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat,
extern void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr);
extern int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu);
extern pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
+extern void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
+ unsigned long *rmap, long pte_index, int realmode);
+extern void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep,
+ unsigned long pte_index);
extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr,
unsigned long *nb_ret);
extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr);
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 79dc37fb86b5..c21e46da4a3b 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -136,6 +136,37 @@ static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type)
return (wimg & (HPTE_R_W | HPTE_R_I)) == io_type;
}
+/*
+ * Lock and read a linux PTE. If it's present and writable, atomically
+ * set dirty and referenced bits and return the PTE, otherwise return 0.
+ */
+static inline pte_t kvmppc_read_update_linux_pte(pte_t *p)
+{
+ pte_t pte, tmp;
+
+ /* wait until _PAGE_BUSY is clear then set it atomically */
+ __asm__ __volatile__ (
+ "1: ldarx %0,0,%3\n"
+ " andi. %1,%0,%4\n"
+ " bne- 1b\n"
+ " ori %1,%0,%4\n"
+ " stdcx. %1,0,%3\n"
+ " bne- 1b"
+ : "=&r" (pte), "=&r" (tmp), "=m" (*p)
+ : "r" (p), "i" (_PAGE_BUSY)
+ : "cc");
+
+ if (pte_present(pte)) {
+ pte = pte_mkyoung(pte);
+ if (pte_write(pte))
+ pte = pte_mkdirty(pte);
+ }
+
+ *p = pte; /* clears _PAGE_BUSY */
+
+ return pte;
+}
+
/* Return HPTE cache control bits corresponding to Linux pte bits */
static inline unsigned long hpte_cache_bits(unsigned long pte_val)
{
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 937cacaaf236..968f3aa61cd1 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -32,6 +32,7 @@
#include <linux/atomic.h>
#include <asm/kvm_asm.h>
#include <asm/processor.h>
+#include <asm/page.h>
#define KVM_MAX_VCPUS NR_CPUS
#define KVM_MAX_VCORES NR_CPUS
@@ -44,6 +45,19 @@
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
#endif
+#ifdef CONFIG_KVM_BOOK3S_64_HV
+#include <linux/mmu_notifier.h>
+
+#define KVM_ARCH_WANT_MMU_NOTIFIER
+
+struct kvm;
+extern int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
+extern int kvm_age_hva(struct kvm *kvm, unsigned long hva);
+extern int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
+extern void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
+
+#endif
+
/* We don't currently support large pages. */
#define KVM_HPAGE_GFN_SHIFT(x) 0
#define KVM_NR_PAGE_SIZES 1
@@ -212,6 +226,7 @@ struct kvm_arch {
struct kvmppc_rma_info *rma;
unsigned long vrma_slb_v;
int rma_setup_done;
+ int using_mmu_notifiers;
struct list_head spapr_tce_tables;
spinlock_t slot_phys_lock;
unsigned long *slot_phys[KVM_MEM_SLOTS_NUM];
@@ -460,6 +475,7 @@ struct kvm_vcpu_arch {
struct list_head run_list;
struct task_struct *run_task;
struct kvm_run *kvm_run;
+ pgd_t *pgdir;
#endif
};
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 16efb3151c20..35c9309bf038 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -495,6 +495,9 @@
#define SPRN_SPRG7 0x117 /* Special Purpose Register General 7 */
#define SPRN_SRR0 0x01A /* Save/Restore Register 0 */
#define SPRN_SRR1 0x01B /* Save/Restore Register 1 */
+#define SRR1_ISI_NOPT 0x40000000 /* ISI: Not found in hash */
+#define SRR1_ISI_N_OR_G 0x10000000 /* ISI: Access is no-exec or G */
+#define SRR1_ISI_PROT 0x08000000 /* ISI: Other protection fault */
#define SRR1_WAKEMASK 0x00380000 /* reason for wakeup */
#define SRR1_WAKESYSERR 0x00300000 /* System error */
#define SRR1_WAKEEE 0x00200000 /* External interrupt */
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index 78133deb4b64..8f64709ae331 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -69,6 +69,7 @@ config KVM_BOOK3S_64
config KVM_BOOK3S_64_HV
bool "KVM support for POWER7 and PPC970 using hypervisor mode in host"
depends on KVM_BOOK3S_64
+ select MMU_NOTIFIER
---help---
Support running unmodified book3s_64 guest kernels in
virtual machines on POWER7 and PPC970 processors that have
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index 2d31519b8637..83761dd8a924 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -281,8 +281,9 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn,
}
/*
- * We come here on a H_ENTER call from the guest when
- * we don't have the requested page pinned already.
+ * We come here on a H_ENTER call from the guest when we are not
+ * using mmu notifiers and we don't have the requested page pinned
+ * already.
*/
long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
long pte_index, unsigned long pteh, unsigned long ptel)
@@ -292,6 +293,9 @@ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
struct kvm_memory_slot *memslot;
long ret;
+ if (kvm->arch.using_mmu_notifiers)
+ goto do_insert;
+
psize = hpte_page_size(pteh, ptel);
if (!psize)
return H_PARAMETER;
@@ -309,9 +313,12 @@ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
return H_PARAMETER;
}
- preempt_disable();
+ do_insert:
+ /* Protect linux PTE lookup from page table destruction */
+ rcu_read_lock_sched(); /* this disables preemption too */
+ vcpu->arch.pgdir = current->mm->pgd;
ret = kvmppc_h_enter(vcpu, flags, pte_index, pteh, ptel);
- preempt_enable();
+ rcu_read_unlock_sched();
if (ret == H_TOO_HARD) {
/* this can't happen */
pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n");
@@ -487,12 +494,16 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned long ea, unsigned long dsisr)
{
struct kvm *kvm = vcpu->kvm;
- unsigned long *hptep, hpte[3];
- unsigned long psize;
- unsigned long gfn;
+ unsigned long *hptep, hpte[3], r;
+ unsigned long mmu_seq, psize, pte_size;
+ unsigned long gfn, hva, pfn;
struct kvm_memory_slot *memslot;
+ unsigned long *rmap;
struct revmap_entry *rev;
- long index;
+ struct page *page, *pages[1];
+ long index, ret, npages;
+ unsigned long is_io;
+ struct vm_area_struct *vma;
/*
* Real-mode code has already searched the HPT and found the
@@ -510,7 +521,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
cpu_relax();
hpte[0] = hptep[0] & ~HPTE_V_HVLOCK;
hpte[1] = hptep[1];
- hpte[2] = rev->guest_rpte;
+ hpte[2] = r = rev->guest_rpte;
asm volatile("lwsync" : : : "memory");
hptep[0] = hpte[0];
preempt_enable();
@@ -520,8 +531,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
return RESUME_GUEST;
/* Translate the logical address and get the page */
- psize = hpte_page_size(hpte[0], hpte[1]);
- gfn = hpte_rpn(hpte[2], psize);
+ psize = hpte_page_size(hpte[0], r);
+ gfn = hpte_rpn(r, psize);
memslot = gfn_to_memslot(kvm, gfn);
/* No memslot means it's an emulated MMIO region */
@@ -531,8 +542,228 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
dsisr & DSISR_ISSTORE);
}
- /* should never get here otherwise */
- return -EFAULT;
+ if (!kvm->arch.using_mmu_notifiers)
+ return -EFAULT; /* should never get here */
+
+ /* used to check for invalidations in progress */
+ mmu_seq = kvm->mmu_notifier_seq;
+ smp_rmb();
+
+ is_io = 0;
+ pfn = 0;
+ page = NULL;
+ pte_size = PAGE_SIZE;
+ hva = gfn_to_hva_memslot(memslot, gfn);
+ npages = get_user_pages_fast(hva, 1, 1, pages);
+ if (npages < 1) {
+ /* Check if it's an I/O mapping */
+ down_read(&current->mm->mmap_sem);
+ vma = find_vma(current->mm, hva);
+ if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end &&
+ (vma->vm_flags & VM_PFNMAP)) {
+ pfn = vma->vm_pgoff +
+ ((hva - vma->vm_start) >> PAGE_SHIFT);
+ pte_size = psize;
+ is_io = hpte_cache_bits(pgprot_val(vma->vm_page_prot));
+ }
+ up_read(&current->mm->mmap_sem);
+ if (!pfn)
+ return -EFAULT;
+ } else {
+ page = pages[0];
+ if (PageHuge(page)) {
+ page = compound_head(page);
+ pte_size <<= compound_order(page);
+ }
+ pfn = page_to_pfn(page);
+ }
+
+ ret = -EFAULT;
+ if (psize > pte_size)
+ goto out_put;
+
+ /* Check WIMG vs. the actual page we're accessing */
+ if (!hpte_cache_flags_ok(r, is_io)) {
+ if (is_io)
+ return -EFAULT;
+ /*
+ * Allow guest to map emulated device memory as
+ * uncacheable, but actually make it cacheable.
+ */
+ r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M;
+ }
+
+ /* Set the HPTE to point to pfn */
+ r = (r & ~(HPTE_R_PP0 - pte_size)) | (pfn << PAGE_SHIFT);
+ ret = RESUME_GUEST;
+ preempt_disable();
+ while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
+ cpu_relax();
+ if ((hptep[0] & ~HPTE_V_HVLOCK) != hpte[0] || hptep[1] != hpte[1] ||
+ rev->guest_rpte != hpte[2])
+ /* HPTE has been changed under us; let the guest retry */
+ goto out_unlock;
+ hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID;
+
+ rmap = &memslot->rmap[gfn - memslot->base_gfn];
+ lock_rmap(rmap);
+
+ /* Check if we might have been invalidated; let the guest retry if so */
+ ret = RESUME_GUEST;
+ if (mmu_notifier_retry(vcpu, mmu_seq)) {
+ unlock_rmap(rmap);
+ goto out_unlock;
+ }
+ kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0);
+
+ hptep[1] = r;
+ eieio();
+ hptep[0] = hpte[0];
+ asm volatile("ptesync" : : : "memory");
+ preempt_enable();
+ if (page)
+ SetPageDirty(page);
+
+ out_put:
+ if (page)
+ put_page(page);
+ return ret;
+
+ out_unlock:
+ hptep[0] &= ~HPTE_V_HVLOCK;
+ preempt_enable();
+ goto out_put;
+}
+
+static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
+ int (*handler)(struct kvm *kvm, unsigned long *rmapp,
+ unsigned long gfn))
+{
+ int ret;
+ int retval = 0;
+ struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
+
+ slots = kvm_memslots(kvm);
+ kvm_for_each_memslot(memslot, slots) {
+ unsigned long start = memslot->userspace_addr;
+ unsigned long end;
+
+ end = start + (memslot->npages << PAGE_SHIFT);
+ if (hva >= start && hva < end) {
+ gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT;
+
+ ret = handler(kvm, &memslot->rmap[gfn_offset],
+ memslot->base_gfn + gfn_offset);
+ retval |= ret;
+ }
+ }
+
+ return retval;
+}
+
+static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp,
+ unsigned long gfn)
+{
+ struct revmap_entry *rev = kvm->arch.revmap;
+ unsigned long h, i, j;
+ unsigned long *hptep;
+ unsigned long ptel, psize;
+
+ for (;;) {
+ while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmapp))
+ cpu_relax();
+ if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
+ __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmapp);
+ break;
+ }
+
+ /*
+ * To avoid an ABBA deadlock with the HPTE lock bit,
+ * we have to unlock the rmap chain before locking the HPTE.
+ * Thus we remove the first entry, unlock the rmap chain,
+ * lock the HPTE and then check that it is for the
+ * page we're unmapping before changing it to non-present.
+ */
+ i = *rmapp & KVMPPC_RMAP_INDEX;
+ j = rev[i].forw;
+ if (j == i) {
+ /* chain is now empty */
+ j = 0;
+ } else {
+ /* remove i from chain */
+ h = rev[i].back;
+ rev[h].forw = j;
+ rev[j].back = h;
+ rev[i].forw = rev[i].back = i;
+ j |= KVMPPC_RMAP_PRESENT;
+ }
+ smp_wmb();
+ *rmapp = j | (1ul << KVMPPC_RMAP_REF_BIT);
+
+ /* Now lock, check and modify the HPTE */
+ hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4));
+ while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
+ cpu_relax();
+ ptel = rev[i].guest_rpte;
+ psize = hpte_page_size(hptep[0], ptel);
+ if ((hptep[0] & HPTE_V_VALID) &&
+ hpte_rpn(ptel, psize) == gfn) {
+ kvmppc_invalidate_hpte(kvm, hptep, i);
+ hptep[0] |= HPTE_V_ABSENT;
+ }
+ hptep[0] &= ~HPTE_V_HVLOCK;
+ }
+ return 0;
+}
+
+int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
+{
+ if (kvm->arch.using_mmu_notifiers)
+ kvm_handle_hva(kvm, hva, kvm_unmap_rmapp);
+ return 0;
+}
+
+static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
+ unsigned long gfn)
+{
+ if (!kvm->arch.using_mmu_notifiers)
+ return 0;
+ if (!(*rmapp & KVMPPC_RMAP_REFERENCED))
+ return 0;
+ kvm_unmap_rmapp(kvm, rmapp, gfn);
+ while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmapp))
+ cpu_relax();
+ __clear_bit(KVMPPC_RMAP_REF_BIT, rmapp);
+ __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmapp);
+ return 1;
+}
+
+int kvm_age_hva(struct kvm *kvm, unsigned long hva)
+{
+ if (!kvm->arch.using_mmu_notifiers)
+ return 0;
+ return kvm_handle_hva(kvm, hva, kvm_age_rmapp);
+}
+
+static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
+ unsigned long gfn)
+{
+ return !!(*rmapp & KVMPPC_RMAP_REFERENCED);
+}
+
+int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
+{
+ if (!kvm->arch.using_mmu_notifiers)
+ return 0;
+ return kvm_handle_hva(kvm, hva, kvm_test_age_rmapp);
+}
+
+void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+{
+ if (!kvm->arch.using_mmu_notifiers)
+ return;
+ kvm_handle_hva(kvm, hva, kvm_unmap_rmapp);
}
void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
@@ -540,31 +771,42 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
{
struct kvm_memory_slot *memslot;
unsigned long gfn = gpa >> PAGE_SHIFT;
- struct page *page;
- unsigned long psize, offset;
+ struct page *page, *pages[1];
+ int npages;
+ unsigned long hva, psize, offset;
unsigned long pa;
unsigned long *physp;
memslot = gfn_to_memslot(kvm, gfn);
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
return NULL;
- physp = kvm->arch.slot_phys[memslot->id];
- if (!physp)
- return NULL;
- physp += gfn - memslot->base_gfn;
- pa = *physp;
- if (!pa) {
- if (kvmppc_get_guest_page(kvm, gfn, memslot, PAGE_SIZE) < 0)
+ if (!kvm->arch.using_mmu_notifiers) {
+ physp = kvm->arch.slot_phys[memslot->id];
+ if (!physp)
return NULL;
+ physp += gfn - memslot->base_gfn;
pa = *physp;
+ if (!pa) {
+ if (kvmppc_get_guest_page(kvm, gfn, memslot,
+ PAGE_SIZE) < 0)
+ return NULL;
+ pa = *physp;
+ }
+ page = pfn_to_page(pa >> PAGE_SHIFT);
+ } else {
+ hva = gfn_to_hva_memslot(memslot, gfn);
+ npages = get_user_pages_fast(hva, 1, 1, pages);
+ if (npages < 1)
+ return NULL;
+ page = pages[0];
}
- page = pfn_to_page(pa >> PAGE_SHIFT);
psize = PAGE_SIZE;
if (PageHuge(page)) {
page = compound_head(page);
psize <<= compound_order(page);
}
- get_page(page);
+ if (!kvm->arch.using_mmu_notifiers)
+ get_page(page);
offset = gpa & (psize - 1);
if (nb_ret)
*nb_ret = psize - offset;
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 45aabb9a527f..86c4191cb75b 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -326,19 +326,19 @@ static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
break;
}
/*
- * We get this if the guest accesses a page which it thinks
- * it has mapped but which is not actually present, because
- * it is for an emulated I/O device.
- * Any other HDSI interrupt has been handled already.
+ * We get these next two if the guest accesses a page which it thinks
+ * it has mapped but which is not actually present, either because
+ * it is for an emulated I/O device or because the corresonding
+ * host page has been paged out. Any other HDSI/HISI interrupts
+ * have been handled already.
*/
case BOOK3S_INTERRUPT_H_DATA_STORAGE:
r = kvmppc_book3s_hv_page_fault(run, vcpu,
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
break;
case BOOK3S_INTERRUPT_H_INST_STORAGE:
- kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE,
- vcpu->arch.shregs.msr & 0x58000000);
- r = RESUME_GUEST;
+ r = kvmppc_book3s_hv_page_fault(run, vcpu,
+ kvmppc_get_pc(vcpu), 0);
break;
/*
* This occurs if the guest executes an illegal instruction.
@@ -867,6 +867,7 @@ int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
flush_altivec_to_thread(current);
flush_vsx_to_thread(current);
vcpu->arch.wqp = &vcpu->arch.vcore->wq;
+ vcpu->arch.pgdir = current->mm->pgd;
do {
r = kvmppc_run_vcpu(run, vcpu);
@@ -1090,9 +1091,9 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
unsigned long *phys;
/* Allocate a slot_phys array */
- npages = mem->memory_size >> PAGE_SHIFT;
phys = kvm->arch.slot_phys[mem->slot];
- if (!phys) {
+ if (!kvm->arch.using_mmu_notifiers && !phys) {
+ npages = mem->memory_size >> PAGE_SHIFT;
phys = vzalloc(npages * sizeof(unsigned long));
if (!phys)
return -ENOMEM;
@@ -1298,6 +1299,7 @@ int kvmppc_core_init_vm(struct kvm *kvm)
}
kvm->arch.lpcr = lpcr;
+ kvm->arch.using_mmu_notifiers = !!cpu_has_feature(CPU_FTR_ARCH_206);
spin_lock_init(&kvm->arch.slot_phys_lock);
return 0;
}
@@ -1306,8 +1308,9 @@ void kvmppc_core_destroy_vm(struct kvm *kvm)
{
unsigned long i;
- for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
- unpin_slot(kvm, i);
+ if (!kvm->arch.using_mmu_notifiers)
+ for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
+ unpin_slot(kvm, i);
if (kvm->arch.rma) {
kvm_release_rma(kvm->arch.rma);
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
index a5176dc37e7e..81d16ed9767d 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
@@ -58,7 +58,7 @@ static void *real_vmalloc_addr(void *x)
* Add this HPTE into the chain for the real page.
* Must be called with the chain locked; it unlocks the chain.
*/
-static void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
+void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
unsigned long *rmap, long pte_index, int realmode)
{
struct revmap_entry *head, *tail;
@@ -83,6 +83,7 @@ static void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
smp_wmb();
*rmap = i | KVMPPC_RMAP_REFERENCED | KVMPPC_RMAP_PRESENT; /* unlock */
}
+EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain);
/* Remove this HPTE from the chain for a real page */
static void remove_revmap_chain(struct kvm *kvm, long pte_index,
@@ -118,12 +119,33 @@ static void remove_revmap_chain(struct kvm *kvm, long pte_index,
unlock_rmap(rmap);
}
+static pte_t lookup_linux_pte(struct kvm_vcpu *vcpu, unsigned long hva,
+ unsigned long *pte_sizep)
+{
+ pte_t *ptep;
+ unsigned long ps = *pte_sizep;
+ unsigned int shift;
+
+ ptep = find_linux_pte_or_hugepte(vcpu->arch.pgdir, hva, &shift);
+ if (!ptep)
+ return __pte(0);
+ if (shift)
+ *pte_sizep = 1ul << shift;
+ else
+ *pte_sizep = PAGE_SIZE;
+ if (ps > *pte_sizep)
+ return __pte(0);
+ if (!pte_present(*ptep))
+ return __pte(0);
+ return kvmppc_read_update_linux_pte(ptep);
+}
+
long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
long pte_index, unsigned long pteh, unsigned long ptel)
{
struct kvm *kvm = vcpu->kvm;
unsigned long i, pa, gpa, gfn, psize;
- unsigned long slot_fn;
+ unsigned long slot_fn, hva;
unsigned long *hpte;
struct revmap_entry *rev;
unsigned long g_ptel = ptel;
@@ -131,6 +153,8 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long *physp, pte_size;
unsigned long is_io;
unsigned long *rmap;
+ pte_t pte;
+ unsigned long mmu_seq;
bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING;
psize = hpte_page_size(pteh, ptel);
@@ -138,11 +162,16 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
return H_PARAMETER;
pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID);
+ /* used later to detect if we might have been invalidated */
+ mmu_seq = kvm->mmu_notifier_seq;
+ smp_rmb();
+
/* Find the memslot (if any) for this address */
gpa = (ptel & HPTE_R_RPN) & ~(psize - 1);
gfn = gpa >> PAGE_SHIFT;
memslot = builtin_gfn_to_memslot(kvm, gfn);
pa = 0;
+ is_io = ~0ul;
rmap = NULL;
if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) {
/* PPC970 can't do emulated MMIO */
@@ -160,19 +189,31 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
slot_fn = gfn - memslot->base_gfn;
rmap = &memslot->rmap[slot_fn];
- physp = kvm->arch.slot_phys[memslot->id];
- if (!physp)
- return H_PARAMETER;
- physp += slot_fn;
- if (realmode)
- physp = real_vmalloc_addr(physp);
- pa = *physp;
- if (!pa)
- return H_TOO_HARD;
- is_io = pa & (HPTE_R_I | HPTE_R_W);
- pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK);
- pa &= PAGE_MASK;
-
+ if (!kvm->arch.using_mmu_notifiers) {
+ physp = kvm->arch.slot_phys[memslot->id];
+ if (!physp)
+ return H_PARAMETER;
+ physp += slot_fn;
+ if (realmode)
+ physp = real_vmalloc_addr(physp);
+ pa = *physp;
+ if (!pa)
+ return H_TOO_HARD;
+ is_io = pa & (HPTE_R_I | HPTE_R_W);
+ pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK);
+ pa &= PAGE_MASK;
+ } else {
+ /* Translate to host virtual address */
+ hva = gfn_to_hva_memslot(memslot, gfn);
+
+ /* Look up the Linux PTE for the backing page */
+ pte_size = psize;
+ pte = lookup_linux_pte(vcpu, hva, &pte_size);
+ if (pte_present(pte)) {
+ is_io = hpte_cache_bits(pte_val(pte));
+ pa = pte_pfn(pte) << PAGE_SHIFT;
+ }
+ }
if (pte_size < psize)
return H_PARAMETER;
if (pa && pte_size > psize)
@@ -180,10 +221,14 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
ptel &= ~(HPTE_R_PP0 - psize);
ptel |= pa;
- pteh |= HPTE_V_VALID;
+
+ if (pa)
+ pteh |= HPTE_V_VALID;
+ else
+ pteh |= HPTE_V_ABSENT;
/* Check WIMG */
- if (!hpte_cache_flags_ok(ptel, is_io)) {
+ if (is_io != ~0ul && !hpte_cache_flags_ok(ptel, is_io)) {
if (is_io)
return H_PARAMETER;
/*
@@ -194,6 +239,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
ptel |= HPTE_R_M;
}
+ /* Find and lock the HPTEG slot to use */
do_insert:
if (pte_index >= HPT_NPTE)
return H_PARAMETER;
@@ -253,7 +299,17 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
if (realmode)
rmap = real_vmalloc_addr(rmap);
lock_rmap(rmap);
- kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, realmode);
+ /* Check for pending invalidations under the rmap chain lock */
+ if (kvm->arch.using_mmu_notifiers &&
+ mmu_notifier_retry(vcpu, mmu_seq)) {
+ /* inval in progress, write a non-present HPTE */
+ pteh |= HPTE_V_ABSENT;
+ pteh &= ~HPTE_V_VALID;
+ unlock_rmap(rmap);
+ } else {
+ kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index,
+ realmode);
+ }
}
hpte[1] = ptel;
@@ -516,6 +572,23 @@ long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
return H_SUCCESS;
}
+void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep,
+ unsigned long pte_index)
+{
+ unsigned long rb;
+
+ hptep[0] &= ~HPTE_V_VALID;
+ rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index);
+ while (!try_lock_tlbie(&kvm->arch.tlbie_lock))
+ cpu_relax();
+ asm volatile("ptesync" : : : "memory");
+ asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
+ : : "r" (rb), "r" (kvm->arch.lpid));
+ asm volatile("ptesync" : : : "memory");
+ kvm->arch.tlbie_lock = 0;
+}
+EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte);
+
static int slb_base_page_shift[4] = {
24, /* 16M */
16, /* 64k */
@@ -605,15 +678,15 @@ EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte);
/*
* Called in real mode to check whether an HPTE not found fault
- * is due to accessing an emulated MMIO page.
+ * is due to accessing a paged-out page or an emulated MMIO page.
* Returns a possibly modified status (DSISR) value if not
* (i.e. pass the interrupt to the guest),
* -1 to pass the fault up to host kernel mode code, -2 to do that
- * and also load the instruction word,
+ * and also load the instruction word (for MMIO emulation),
* or 0 if we should make the guest retry the access.
*/
long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
- unsigned long slb_v, unsigned int status)
+ unsigned long slb_v, unsigned int status, bool data)
{
struct kvm *kvm = vcpu->kvm;
long int index;
@@ -624,6 +697,7 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
unsigned long pp, key;
valid = HPTE_V_VALID | HPTE_V_ABSENT;
+
index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid);
if (index < 0)
return status; /* there really was no HPTE */
@@ -645,22 +719,28 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
/* Check access permissions to the page */
pp = gr & (HPTE_R_PP0 | HPTE_R_PP);
key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS;
- if (status & DSISR_ISSTORE) {
+ status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */
+ if (!data) {
+ if (gr & (HPTE_R_N | HPTE_R_G))
+ return status | SRR1_ISI_N_OR_G;
+ if (!hpte_read_permission(pp, slb_v & key))
+ return status | SRR1_ISI_PROT;
+ } else if (status & DSISR_ISSTORE) {
/* check write permission */
if (!hpte_write_permission(pp, slb_v & key))
- goto protfault;
+ return status | DSISR_PROTFAULT;
} else {
if (!hpte_read_permission(pp, slb_v & key))
- goto protfault;
+ return status | DSISR_PROTFAULT;
}
/* Check storage key, if applicable */
- if (vcpu->arch.shregs.msr & MSR_DR) {
+ if (data && (vcpu->arch.shregs.msr & MSR_DR)) {
unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr);
if (status & DSISR_ISSTORE)
perm >>= 1;
if (perm & 1)
- return (status & ~DSISR_NOHPTE) | DSISR_KEYFAULT;
+ return status | DSISR_KEYFAULT;
}
/* Save HPTE info for virtual-mode handler */
@@ -669,11 +749,11 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
vcpu->arch.pgfault_hpte[0] = v;
vcpu->arch.pgfault_hpte[1] = r;
- if (vcpu->arch.shregs.msr & MSR_IR)
+ /* Check the storage key to see if it is possibly emulated MMIO */
+ if (data && (vcpu->arch.shregs.msr & MSR_IR) &&
+ (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
+ (HPTE_R_KEY_HI | HPTE_R_KEY_LO))
return -2; /* MMIO emulation - load instr word */
return -1; /* send fault up to host kernel mode */
-
- protfault:
- return (status & ~DSISR_NOHPTE) | DSISR_PROTFAULT;
}
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index d07b64d5f37e..7d4990665d00 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -621,6 +621,8 @@ BEGIN_FTR_SECTION
/* If this is a page table miss then see if it's theirs or ours */
cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE
beq kvmppc_hdsi
+ cmpwi r12, BOOK3S_INTERRUPT_H_INST_STORAGE
+ beq kvmppc_hisi
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/* See if this is a leftover HDEC interrupt */
@@ -1125,6 +1127,7 @@ kvmppc_hdsi:
/* Search the hash table. */
mr r3, r9 /* vcpu pointer */
+ li r7, 1 /* data fault */
bl .kvmppc_hpte_hv_fault
ld r9, HSTATE_KVM_VCPU(r13)
ld r10, VCPU_PC(r9)
@@ -1182,6 +1185,52 @@ kvmppc_hdsi:
b nohpte_cont
/*
+ * Similarly for an HISI, reflect it to the guest as an ISI unless
+ * it is an HPTE not found fault for a page that we have paged out.
+ */
+kvmppc_hisi:
+ andis. r0, r11, SRR1_ISI_NOPT@h
+ beq 1f
+ andi. r0, r11, MSR_IR /* instruction relocation enabled? */
+ beq 3f
+ clrrdi r0, r10, 28
+ PPC_SLBFEE_DOT(r5, r0) /* if so, look up SLB */
+ bne 1f /* if no SLB entry found */
+4:
+ /* Search the hash table. */
+ mr r3, r9 /* vcpu pointer */
+ mr r4, r10
+ mr r6, r11
+ li r7, 0 /* instruction fault */
+ bl .kvmppc_hpte_hv_fault
+ ld r9, HSTATE_KVM_VCPU(r13)
+ ld r10, VCPU_PC(r9)
+ ld r11, VCPU_MSR(r9)
+ li r12, BOOK3S_INTERRUPT_H_INST_STORAGE
+ cmpdi r3, 0 /* retry the instruction */
+ beq 6f
+ cmpdi r3, -1 /* handle in kernel mode */
+ beq nohpte_cont
+
+ /* Synthesize an ISI for the guest */
+ mr r11, r3
+1: mtspr SPRN_SRR0, r10
+ mtspr SPRN_SRR1, r11
+ li r10, BOOK3S_INTERRUPT_INST_STORAGE
+ li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */
+ rotldi r11, r11, 63
+6: ld r7, VCPU_CTR(r9)
+ lwz r8, VCPU_XER(r9)
+ mtctr r7
+ mtxer r8
+ mr r4, r9
+ b fast_guest_return
+
+3: ld r6, VCPU_KVM(r9) /* not relocated, use VRMA */
+ ld r5, KVM_VRMA_SLB_V(r6)
+ b 4b
+
+/*
* Try to handle an hcall in real mode.
* Returns to the guest if we handle it, or continues on up to
* the kernel if we can't (i.e. if we don't have a handler for
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 4f85ac32258a..06e955b5837e 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -245,6 +245,9 @@ int kvm_dev_ioctl_check_extension(long ext)
if (cpu_has_feature(CPU_FTR_ARCH_201))
r = 2;
break;
+ case KVM_CAP_SYNC_MMU:
+ r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0;
+ break;
#endif
default:
r = 0;
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index a8b3cc7d90fe..f348c3d90404 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -12,6 +12,7 @@
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/hugetlb.h>
+#include <linux/export.h>
#include <linux/of_fdt.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>
@@ -103,6 +104,7 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift
*shift = hugepd_shift(*hpdp);
return hugepte_offset(hpdp, ea, pdshift);
}
+EXPORT_SYMBOL_GPL(find_linux_pte_or_hugepte);
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.