[RFC PATCH v3 41/59] KVM: VMX: Split out guts of EPT violation to common/exposed function

isaku.yamahata
2021-11-25T00:22:52Z

From: Sean Christopherson <sean.j.christopherson@intel.com>

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/vmx/common.h | 29 +++++++++++++++++++++++++++++
arch/x86/kvm/vmx/vmx.c | 33 +++++----------------------------
2 files changed, 34 insertions(+), 28 deletions(-)

diff --git a/arch/x86/kvm/vmx/common.h b/arch/x86/kvm/vmx/common.h
index 81c73f30d01d..9e5865b05d47 100644
--- a/arch/x86/kvm/vmx/common.h
+++ b/arch/x86/kvm/vmx/common.h
@@ -5,8 +5,11 @@
#include <linux/kvm_host.h>

#include <asm/traps.h>
+#include <asm/vmx.h>

+#include "mmu.h"
#include "vmcs.h"
+#include "vmx.h"
#include "x86.h"

extern unsigned long vmx_host_idt_base;
@@ -49,4 +52,30 @@ static inline void vmx_handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu,
vmx_handle_interrupt_nmi_irqoff(vcpu, gate_offset(desc));
}

+static inline int __vmx_handle_ept_violation(struct kvm_vcpu *vcpu, gpa_t gpa,
+ unsigned long exit_qualification)
+{
+ u64 error_code;
+
+ /* Is it a read fault? */
+ error_code = (exit_qualification & EPT_VIOLATION_ACC_READ)
+ ? PFERR_USER_MASK : 0;
+ /* Is it a write fault? */
+ error_code |= (exit_qualification & EPT_VIOLATION_ACC_WRITE)
+ ? PFERR_WRITE_MASK : 0;
+ /* Is it a fetch fault? */
+ error_code |= (exit_qualification & EPT_VIOLATION_ACC_INSTR)
+ ? PFERR_FETCH_MASK : 0;
+ /* ept page table entry is present? */
+ error_code |= (exit_qualification &
+ (EPT_VIOLATION_READABLE | EPT_VIOLATION_WRITABLE |
+ EPT_VIOLATION_EXECUTABLE))
+ ? PFERR_PRESENT_MASK : 0;
+
+ error_code |= (exit_qualification & EPT_VIOLATION_GVA_TRANSLATED) != 0 ?
+ PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;
+
+ return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
+}
+
#endif /* __KVM_X86_VMX_COMMON_H */
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 4730fd15bea6..92b2c4ac627c 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5230,11 +5230,10 @@ static int handle_task_switch(struct kvm_vcpu *vcpu)

static int handle_ept_violation(struct kvm_vcpu *vcpu)
{
- unsigned long exit_qualification;
- gpa_t gpa;
- u64 error_code;
+ unsigned long exit_qualification = vmx_get_exit_qual(vcpu);
+ gpa_t gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);

- exit_qualification = vmx_get_exit_qual(vcpu);
+ trace_kvm_page_fault(gpa, exit_qualification);

/*
* EPT violation happened while executing iret from NMI,
@@ -5243,31 +5242,9 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
* AAK134, BY25.
*/
if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
- enable_vnmi &&
- (exit_qualification & INTR_INFO_UNBLOCK_NMI))
+ enable_vnmi && (exit_qualification & INTR_INFO_UNBLOCK_NMI))
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI);

- gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
- trace_kvm_page_fault(gpa, exit_qualification);
-
- /* Is it a read fault? */
- error_code = (exit_qualification & EPT_VIOLATION_ACC_READ)
- ? PFERR_USER_MASK : 0;
- /* Is it a write fault? */
- error_code |= (exit_qualification & EPT_VIOLATION_ACC_WRITE)
- ? PFERR_WRITE_MASK : 0;
- /* Is it a fetch fault? */
- error_code |= (exit_qualification & EPT_VIOLATION_ACC_INSTR)
- ? PFERR_FETCH_MASK : 0;
- /* ept page table entry is present? */
- error_code |= (exit_qualification &
- (EPT_VIOLATION_READABLE | EPT_VIOLATION_WRITABLE |
- EPT_VIOLATION_EXECUTABLE))
- ? PFERR_PRESENT_MASK : 0;
-
- error_code |= (exit_qualification & EPT_VIOLATION_GVA_TRANSLATED) != 0 ?
- PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;
-
vcpu->arch.exit_qualification = exit_qualification;

/*
@@ -5281,7 +5258,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
if (unlikely(allow_smaller_maxphyaddr && kvm_vcpu_is_illegal_gpa(vcpu, gpa)))
return kvm_emulate_instruction(vcpu, 0);

- return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
+ return __vmx_handle_ept_violation(vcpu, gpa, exit_qualification);
}

static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
--
2.25.1