[PATCH v2 02/13] KVM: x86: Explicitly pass an exception struct to check_intercept

Sean Christopherson
2020-02-18T23:29:58Z

Explicitly pass an exception struct when checking for intercept from
the emulator, which eliminates the last reference to arch.emulate_ctxt
in vendor specific code.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/include/asm/kvm_host.h | 3 ++-
arch/x86/kvm/svm.c | 3 ++-
arch/x86/kvm/vmx/vmx.c | 8 ++++----
arch/x86/kvm/x86.c | 3 ++-
4 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4dffbc10d3f8..c750cd957558 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1160,7 +1160,8 @@ struct kvm_x86_ops {

int (*check_intercept)(struct kvm_vcpu *vcpu,
struct x86_instruction_info *info,
- enum x86_intercept_stage stage);
+ enum x86_intercept_stage stage,
+ struct x86_exception *exception);
void (*handle_exit_irqoff)(struct kvm_vcpu *vcpu,
enum exit_fastpath_completion *exit_fastpath);
bool (*mpx_supported)(void);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a3e32d61d60c..ae62ea454158 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6180,7 +6180,8 @@ static const struct __x86_intercept {

static int svm_check_intercept(struct kvm_vcpu *vcpu,
struct x86_instruction_info *info,
- enum x86_intercept_stage stage)
+ enum x86_intercept_stage stage,
+ struct x86_exception *exception)
{
struct vcpu_svm *svm = to_svm(vcpu);
int vmexit, ret = X86EMUL_CONTINUE;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 9a6664886f2e..09bb0d98afeb 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7100,10 +7100,10 @@ static void vmx_request_immediate_exit(struct kvm_vcpu *vcpu)

static int vmx_check_intercept(struct kvm_vcpu *vcpu,
struct x86_instruction_info *info,
- enum x86_intercept_stage stage)
+ enum x86_intercept_stage stage,
+ struct x86_exception *exception)
{
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
- struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;

/*
* RDPID causes #UD if disabled through secondary execution controls.
@@ -7111,8 +7111,8 @@ static int vmx_check_intercept(struct kvm_vcpu *vcpu,
*/
if (info->intercept == x86_intercept_rdtscp &&
!nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDTSCP)) {
- ctxt->exception.vector = UD_VECTOR;
- ctxt->exception.error_code_valid = false;
+ exception->vector = UD_VECTOR;
+ exception->error_code_valid = false;
return X86EMUL_PROPAGATE_FAULT;
}

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6554abef631f..409bf35f26fd 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6267,7 +6267,8 @@ static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
struct x86_instruction_info *info,
enum x86_intercept_stage stage)
{
- return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
+ return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage,
+ &ctxt->exception);
}

static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
--
2.24.1