[PATCH v4 1/2] KVM: X86: Introduce handle_ud()

Wanpeng Li
2018-03-30T09:06:43Z

From: Wanpeng Li <wanpengli@tencent.com>

Introduce handle_ud() to handle invalid opcode, this function will be
used by later patches.

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-By: Liran Alon <liran.alon@oracle.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/x86/kvm/svm.c | 9 +--------
arch/x86/kvm/vmx.c | 10 ++--------
arch/x86/kvm/x86.c | 13 +++++++++++++
arch/x86/kvm/x86.h | 2 ++
4 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f66fc2e..e0a3f56 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2676,14 +2676,7 @@ static int bp_interception(struct vcpu_svm *svm)

static int ud_interception(struct vcpu_svm *svm)
{
- int er;
-
- er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD);
- if (er == EMULATE_USER_EXIT)
- return 0;
- if (er != EMULATE_DONE)
- kvm_queue_exception(&svm->vcpu, UD_VECTOR);
- return 1;
+ return handle_ud(&svm->vcpu);
}

static int ac_interception(struct vcpu_svm *svm)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index b2f8a70..0f11243 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6436,14 +6436,8 @@ static int handle_exception(struct kvm_vcpu *vcpu)
if (is_nmi(intr_info))
return 1; /* already handled by vmx_vcpu_run() */

- if (is_invalid_opcode(intr_info)) {
- er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
- if (er == EMULATE_USER_EXIT)
- return 0;
- if (er != EMULATE_DONE)
- kvm_queue_exception(vcpu, UD_VECTOR);
- return 1;
- }
+ if (is_invalid_opcode(intr_info))
+ return handle_ud(vcpu);

error_code = 0;
if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7d9a444..1eb495e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4840,6 +4840,19 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
}
EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);

+int handle_ud(struct kvm_vcpu *vcpu)
+{
+ enum emulation_result er;
+
+ er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
+ if (er == EMULATE_USER_EXIT)
+ return 0;
+ if (er != EMULATE_DONE)
+ kvm_queue_exception(vcpu, UD_VECTOR);
+ return 1;
+}
+EXPORT_SYMBOL_GPL(handle_ud);
+
static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
gpa_t gpa, bool write)
{
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 1e86174..7d35ce6 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -255,6 +255,8 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
gva_t addr, void *val, unsigned int bytes,
struct x86_exception *exception);

+int handle_ud(struct kvm_vcpu *vcpu);
+
void kvm_vcpu_mtrr_init(struct kvm_vcpu *vcpu);
u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
bool kvm_mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data);
--
2.7.4