From: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
These are needed by the introspection subsystem.
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
Co-developed-by: Marian Rotariu <marian.c.rotariu@xxxxxxxxx>
Signed-off-by: Marian Rotariu <marian.c.rotariu@xxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/kvm_emulate.h | 1 +
arch/x86/kvm/emulate.c | 4 +++
arch/x86/kvm/mmu/mmu.c | 57 +++++++++++++++++++++++-------
arch/x86/kvm/x86.c | 42 +++++++++++++++++-----
4 files changed, 83 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index 77cf6c11f66b..067b95bd83c6 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -447,6 +447,7 @@ bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt);
#define EMULATION_OK 0
#define EMULATION_RESTART 1
#define EMULATION_INTERCEPTED 2
+#define EMULATION_RETRY_INSTR 3
void init_decode_cache(struct x86_emulate_ctxt *ctxt);
int x86_emulate_insn(struct x86_emulate_ctxt *ctxt);
int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 952d1a4f4d7e..2af9bf7e226b 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -5414,6 +5414,8 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
ctxt->memopp->addr.mem.ea + ctxt->_eip);
done:
+ if (rc == X86EMUL_RETRY_INSTR)
+ return EMULATION_RETRY_INSTR;
if (rc == X86EMUL_PROPAGATE_FAULT)
ctxt->have_exception = true;
return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
@@ -5786,6 +5788,8 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
if (rc == X86EMUL_INTERCEPTED)
return EMULATION_INTERCEPTED;
+ if (rc == X86EMUL_RETRY_INSTR)
+ return EMULATION_RETRY_INSTR;
if (rc == X86EMUL_CONTINUE)
writeback_registers(ctxt);
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 124e7ca73b48..5f0ddc6b67de 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1218,9 +1218,13 @@ static void account_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)
slot = __gfn_to_memslot(slots, gfn);
/* the non-leaf shadow pages are keeping readonly. */
- if (sp->role.level > PT_PAGE_TABLE_LEVEL)
- return kvm_slot_page_track_add_page(kvm, slot, gfn,
- KVM_PAGE_TRACK_WRITE);
+ if (sp->role.level > PT_PAGE_TABLE_LEVEL) {
+ kvm_slot_page_track_add_page(kvm, slot, gfn,
+ KVM_PAGE_TRACK_PREWRITE);
+ kvm_slot_page_track_add_page(kvm, slot, gfn,
+ KVM_PAGE_TRACK_WRITE);
+ return;
+ }
kvm_mmu_gfn_disallow_lpage(slot, gfn);
}
@@ -1246,9 +1250,13 @@ static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)
gfn = sp->gfn;
slots = kvm_memslots_for_spte_role(kvm, sp->role);
slot = __gfn_to_memslot(slots, gfn);
- if (sp->role.level > PT_PAGE_TABLE_LEVEL)
- return kvm_slot_page_track_remove_page(kvm, slot, gfn,
- KVM_PAGE_TRACK_WRITE);
+ if (sp->role.level > PT_PAGE_TABLE_LEVEL) {
+ kvm_slot_page_track_remove_page(kvm, slot, gfn,
+ KVM_PAGE_TRACK_PREWRITE);
+ kvm_slot_page_track_remove_page(kvm, slot, gfn,
+ KVM_PAGE_TRACK_WRITE);
+ return;
+ }
kvm_mmu_gfn_allow_lpage(slot, gfn);
}
@@ -3041,7 +3049,8 @@ static bool mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
{
struct kvm_mmu_page *sp;
- if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
+ if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_PREWRITE) ||
+ kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
return true;
for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn) {
@@ -3398,6 +3407,21 @@ static void disallowed_hugepage_adjust(struct kvm_shadow_walk_iterator it,
}
}
+static unsigned int kvm_mmu_apply_introspection_access(struct kvm_vcpu *vcpu,
+ gfn_t gfn,
+ unsigned int acc)
+{
+ if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_PREREAD))
+ acc &= ~ACC_USER_MASK;
+ if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_PREWRITE) ||
+ kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
+ acc &= ~ACC_WRITE_MASK;
+ if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_PREEXEC))
+ acc &= ~ACC_EXEC_MASK;
+
+ return acc;
+}
+
static int __direct_map(struct kvm_vcpu *vcpu, gpa_t gpa, int write,
int map_writable, int level, kvm_pfn_t pfn,
bool prefault, bool lpage_disallowed)
@@ -3407,6 +3431,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t gpa, int write,
int ret;
gfn_t gfn = gpa >> PAGE_SHIFT;
gfn_t base_gfn = gfn;
+ unsigned int acc;
if (!VALID_PAGE(vcpu->arch.mmu->root_hpa))
return RET_PF_RETRY;
@@ -3434,7 +3459,9 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t gpa, int write,
}
}
- ret = mmu_set_spte(vcpu, it.sptep, ACC_ALL,
+ acc = kvm_mmu_apply_introspection_access(vcpu, base_gfn, ACC_ALL);
+
+ ret = mmu_set_spte(vcpu, it.sptep, acc,
write, level, base_gfn, pfn, prefault,
map_writable);
direct_pte_prefetch(vcpu, it.sptep);
@@ -4199,15 +4226,21 @@ static bool page_fault_handle_page_track(struct kvm_vcpu *vcpu,
if (unlikely(error_code & PFERR_RSVD_MASK))
return false;
- if (!(error_code & PFERR_PRESENT_MASK) ||
- !(error_code & PFERR_WRITE_MASK))
+ if (!(error_code & PFERR_PRESENT_MASK))
return false;
/*
- * guest is writing the page which is write tracked which can
+ * guest is reading/writing/fetching the page which is
+ * read/write/execute tracked which can
* not be fixed by page fault handler.
*/
- if (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE))
+ if (((error_code & PFERR_USER_MASK)
+ && kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_PREREAD))
+ || ((error_code & PFERR_WRITE_MASK)
+ && (kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_PREWRITE)
+ || kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_WRITE)))
+ || ((error_code & PFERR_FETCH_MASK)
+ && kvm_page_track_is_active(vcpu, gfn, KVM_PAGE_TRACK_PREEXEC)))
return true;
return false;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c73da40791a7..8c6a8d03e41a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5346,6 +5346,8 @@ static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
+ if (!kvm_page_track_preread(vcpu, gpa, addr, toread))
+ return X86EMUL_RETRY_INSTR;
ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data,
offset, toread);
if (ret < 0) {
@@ -5377,6 +5379,9 @@ static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
if (unlikely(gpa == UNMAPPED_GVA))
return X86EMUL_PROPAGATE_FAULT;
+ if (!kvm_page_track_preexec(vcpu, gpa, addr))
+ return X86EMUL_RETRY_INSTR;
+
offset = addr & (PAGE_SIZE-1);
if (WARN_ON(offset + bytes > PAGE_SIZE))
bytes = (unsigned)PAGE_SIZE - offset;
@@ -5557,13 +5562,22 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, gva_t gva,
const void *val, int bytes)
{
- int ret;
-
- ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes);
- if (ret < 0)
- return 0;
+ if (!kvm_page_track_prewrite(vcpu, gpa, gva, val, bytes))
+ return X86EMUL_RETRY_INSTR;
+ if (kvm_vcpu_write_guest(vcpu, gpa, val, bytes) < 0)
+ return X86EMUL_UNHANDLEABLE;
kvm_page_track_write(vcpu, gpa, gva, val, bytes);
- return 1;
+ return X86EMUL_CONTINUE;
+}
+
+static int emulator_read_phys(struct kvm_vcpu *vcpu, gpa_t gpa, gva_t gva,
+ void *val, int bytes)
+{
+ if (!kvm_page_track_preread(vcpu, gpa, gva, bytes))
+ return X86EMUL_RETRY_INSTR;
+ if (kvm_vcpu_read_guest(vcpu, gpa, val, bytes) < 0)
+ return X86EMUL_UNHANDLEABLE;
+ return X86EMUL_CONTINUE;
}
struct read_write_emulator_ops {
@@ -5593,7 +5607,7 @@ static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, gva_t gva,
void *val, int bytes)
{
- return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes);
+ return emulator_read_phys(vcpu, gpa, gva, val, bytes);
}
static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, gva_t gva,
@@ -5668,8 +5682,11 @@ static int emulator_read_write_onepage(unsigned long addr, void *val,
return X86EMUL_PROPAGATE_FAULT;
}
- if (!ret && ops->read_write_emulate(vcpu, gpa, addr, val, bytes))
- return X86EMUL_CONTINUE;
+ if (!ret) {
+ ret = ops->read_write_emulate(vcpu, gpa, addr, val, bytes);
+ if (ret == X86EMUL_CONTINUE || ret == X86EMUL_RETRY_INSTR)
+ return ret;
+ }
/*
* Is this MMIO handled locally?
@@ -5803,6 +5820,9 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
if (kvm_vcpu_map(vcpu, gpa_to_gfn(gpa), &map))
goto emul_write;
+ if (!kvm_page_track_prewrite(vcpu, gpa, addr, new, bytes))
+ return X86EMUL_RETRY_INSTR;
+
kaddr = map.hva + offset_in_page(gpa);
switch (bytes) {
@@ -6683,6 +6703,8 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
trace_kvm_emulate_insn_start(vcpu);
++vcpu->stat.insn_emulation;
+ if (r == EMULATION_RETRY_INSTR)
+ return 1;
if (r != EMULATION_OK) {
if ((emulation_type & EMULTYPE_TRAP_UD) ||
(emulation_type & EMULTYPE_TRAP_UD_FORCED)) {
@@ -6740,6 +6762,8 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
r = x86_emulate_insn(ctxt);
+ if (r == EMULATION_RETRY_INSTR)
+ return 1;
if (r == EMULATION_INTERCEPTED)
return 1;
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