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From 656ae55f24476e152600b6109dbdb517f883dc77 Mon Sep 17 00:00:00 2001
From: Sudheesh Mavila <sudheesh.mavila@amd.com>
Date: Tue, 14 Aug 2018 22:48:00 +0530
Subject: [PATCH 82/95] KVM: SVM: limit kvm_handle_page_fault to #PF handling
commit d0006530576f1c7a49b2010eac7afdcb5a3613ae
It has always annoyed me a bit how SVM_EXIT_NPF is handled by
pf_interception. This is also the only reason behind the
under-documented need_unprotect argument to kvm_handle_page_fault.
Let NPF go straight to kvm_mmu_page_fault, just like VMX
does in handle_ept_violation and handle_ept_misconfig.
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sudheesh Mavila <sudheesh.mavila@amd.com>
---
arch/x86/kvm/mmu.c | 5 ++---
arch/x86/kvm/mmu.h | 3 +--
arch/x86/kvm/svm.c | 15 +++++++++++++--
arch/x86/kvm/vmx.c | 3 +--
4 files changed, 17 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 1dfb808..1408d79 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3853,8 +3853,7 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
}
int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
- u64 fault_address, char *insn, int insn_len,
- bool need_unprotect)
+ u64 fault_address, char *insn, int insn_len)
{
int r = 1;
@@ -3863,7 +3862,7 @@ int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
default:
trace_kvm_page_fault(fault_address, error_code);
- if (need_unprotect && kvm_event_needs_reinjection(vcpu))
+ if (kvm_event_needs_reinjection(vcpu))
kvm_mmu_unprotect_page_virt(vcpu, fault_address);
r = kvm_mmu_page_fault(vcpu, fault_address, error_code, insn,
insn_len);
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index efc8576..5b408c0 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -66,8 +66,7 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
bool accessed_dirty);
bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu);
int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
- u64 fault_address, char *insn, int insn_len,
- bool need_unprotect);
+ u64 fault_address, char *insn, int insn_len);
static inline unsigned int kvm_mmu_available_pages(struct kvm *kvm)
{
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2dcfd9f..364531e 100755
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2488,7 +2488,18 @@ static int pf_interception(struct vcpu_svm *svm)
return kvm_handle_page_fault(&svm->vcpu, error_code, fault_address,
svm->vmcb->control.insn_bytes,
- svm->vmcb->control.insn_len, !npt_enabled);
+ svm->vmcb->control.insn_len);
+}
+
+static int npf_interception(struct vcpu_svm *svm)
+{
+ u64 fault_address = svm->vmcb->control.exit_info_2;
+ u64 error_code = svm->vmcb->control.exit_info_1;
+
+ trace_kvm_page_fault(fault_address, error_code);
+ return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code,
+ svm->vmcb->control.insn_bytes,
+ svm->vmcb->control.insn_len);
}
static int db_interception(struct vcpu_svm *svm)
@@ -4586,7 +4597,7 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_MONITOR] = monitor_interception,
[SVM_EXIT_MWAIT] = mwait_interception,
[SVM_EXIT_XSETBV] = xsetbv_interception,
- [SVM_EXIT_NPF] = pf_interception,
+ [SVM_EXIT_NPF] = npf_interception,
[SVM_EXIT_RSM] = emulate_on_interception,
[SVM_EXIT_AVIC_INCOMPLETE_IPI] = avic_incomplete_ipi_interception,
[SVM_EXIT_AVIC_UNACCELERATED_ACCESS] = avic_unaccelerated_access_interception,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index fd46d89..815ff09 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6344,8 +6344,7 @@ static int handle_exception(struct kvm_vcpu *vcpu)
cr2 = vmcs_readl(EXIT_QUALIFICATION);
/* EPT won't cause page fault directly */
WARN_ON_ONCE(!vcpu->arch.apf.host_apf_reason && enable_ept);
- return kvm_handle_page_fault(vcpu, error_code, cr2, NULL, 0,
- true);
+ return kvm_handle_page_fault(vcpu, error_code, cr2, NULL, 0);
}
ex_no = intr_info & INTR_INFO_VECTOR_MASK;
--
2.7.4
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