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Date: Wed, 26 Dec 2007 13:05:21 +0200
From: Avi Kivity <avi@...ranet.com>
To: linux-kernel@...r.kernel.org, kvm-devel@...ts.sourceforge.net
Subject: [PATCH 16/55] KVM: Move page fault processing to common code
The code that dispatches the page fault and emulates if we failed to map
is duplicated across vmx and svm. Merge it to simplify further bugfixing.
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
drivers/kvm/mmu.c | 36 ++++++++++++++++++++++++++++++++++++
drivers/kvm/svm.c | 33 +--------------------------------
drivers/kvm/vmx.c | 29 +----------------------------
drivers/kvm/x86.h | 6 +-----
4 files changed, 39 insertions(+), 65 deletions(-)
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index d9c5950..ace3cb8 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -1347,6 +1347,42 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
}
}
+int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
+{
+ int r;
+ enum emulation_result er;
+
+ mutex_lock(&vcpu->kvm->lock);
+ r = vcpu->mmu.page_fault(vcpu, cr2, error_code);
+ if (r < 0)
+ goto out;
+
+ if (!r) {
+ r = 1;
+ goto out;
+ }
+
+ er = emulate_instruction(vcpu, vcpu->run, cr2, error_code, 0);
+ mutex_unlock(&vcpu->kvm->lock);
+
+ switch (er) {
+ case EMULATE_DONE:
+ return 1;
+ case EMULATE_DO_MMIO:
+ ++vcpu->stat.mmio_exits;
+ return 0;
+ case EMULATE_FAIL:
+ kvm_report_emulation_failure(vcpu, "pagetable");
+ return 1;
+ default:
+ BUG();
+ }
+out:
+ mutex_unlock(&vcpu->kvm->lock);
+ return r;
+}
+EXPORT_SYMBOL_GPL(kvm_mmu_page_fault);
+
static void free_mmu_pages(struct kvm_vcpu *vcpu)
{
struct kvm_mmu_page *page;
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index cdd4fd2..991e77d 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -933,45 +933,14 @@ static int pf_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
struct kvm *kvm = svm->vcpu.kvm;
u64 fault_address;
u32 error_code;
- enum emulation_result er;
- int r;
if (!irqchip_in_kernel(kvm) &&
is_external_interrupt(exit_int_info))
push_irq(&svm->vcpu, exit_int_info & SVM_EVTINJ_VEC_MASK);
- mutex_lock(&kvm->lock);
-
fault_address = svm->vmcb->control.exit_info_2;
error_code = svm->vmcb->control.exit_info_1;
- r = kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code);
- if (r < 0) {
- mutex_unlock(&kvm->lock);
- return r;
- }
- if (!r) {
- mutex_unlock(&kvm->lock);
- return 1;
- }
- er = emulate_instruction(&svm->vcpu, kvm_run, fault_address,
- error_code, 0);
- mutex_unlock(&kvm->lock);
-
- switch (er) {
- case EMULATE_DONE:
- return 1;
- case EMULATE_DO_MMIO:
- ++svm->vcpu.stat.mmio_exits;
- return 0;
- case EMULATE_FAIL:
- kvm_report_emulation_failure(&svm->vcpu, "pagetable");
- break;
- default:
- BUG();
- }
-
- kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
- return 0;
+ return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code);
}
static int ud_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index f76677d..265df86 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1796,7 +1796,6 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
unsigned long cr2, rip;
u32 vect_info;
enum emulation_result er;
- int r;
vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
@@ -1834,33 +1833,7 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
if (is_page_fault(intr_info)) {
cr2 = vmcs_readl(EXIT_QUALIFICATION);
-
- mutex_lock(&vcpu->kvm->lock);
- r = kvm_mmu_page_fault(vcpu, cr2, error_code);
- if (r < 0) {
- mutex_unlock(&vcpu->kvm->lock);
- return r;
- }
- if (!r) {
- mutex_unlock(&vcpu->kvm->lock);
- return 1;
- }
-
- er = emulate_instruction(vcpu, kvm_run, cr2, error_code, 0);
- mutex_unlock(&vcpu->kvm->lock);
-
- switch (er) {
- case EMULATE_DONE:
- return 1;
- case EMULATE_DO_MMIO:
- ++vcpu->stat.mmio_exits;
- return 0;
- case EMULATE_FAIL:
- kvm_report_emulation_failure(vcpu, "pagetable");
- break;
- default:
- BUG();
- }
+ return kvm_mmu_page_fault(vcpu, cr2, error_code);
}
if (vcpu->rmode.active &&
diff --git a/drivers/kvm/x86.h b/drivers/kvm/x86.h
index 01452b5..20da8e9 100644
--- a/drivers/kvm/x86.h
+++ b/drivers/kvm/x86.h
@@ -85,11 +85,7 @@ struct kvm_vcpu {
struct x86_emulate_ctxt emulate_ctxt;
};
-static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
- u32 error_code)
-{
- return vcpu->mmu.page_fault(vcpu, gva, error_code);
-}
+int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
{
--
1.5.3.7
--
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