From: Nicușor Cîțu <ncitu@xxxxxxxxxxxxxxx>
The introspection tool and the userspace can request #BP interception.
This function will be used to check if this interception is enabled
by either side.
Signed-off-by: Nicușor Cîțu <ncitu@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/svm.c | 15 +++++++++++++++
arch/x86/kvm/vmx/vmx.c | 6 ++++++
3 files changed, 22 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 98959e8cd448..afc5bf3fa730 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1077,6 +1077,7 @@ struct kvm_x86_ops {
void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
void (*vcpu_put)(struct kvm_vcpu *vcpu);
+ bool (*bp_intercepted)(struct kvm_vcpu *vcpu);
void (*update_bp_intercept)(struct kvm_vcpu *vcpu);
int (*get_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 50d1ebafe0b3..73871f28ad7b 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -611,6 +611,13 @@ static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
recalc_intercepts(svm);
}
+static inline bool get_exception_intercept(struct vcpu_svm *svm, int bit)
+{
+ struct vmcb *vmcb = get_host_vmcb(svm);
+
+ return (vmcb->control.intercept_exceptions & (1U << bit));
+}
+
static inline void set_intercept(struct vcpu_svm *svm, int bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);
@@ -7393,6 +7400,13 @@ static void svm_pre_update_apicv_exec_ctrl(struct kvm *kvm, bool activate)
avic_update_access_page(kvm, activate);
}
+static inline bool svm_bp_intercepted(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ return get_exception_intercept(svm, BP_VECTOR);
+}
+
static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.cpu_has_kvm_support = has_svm,
.disabled_by_bios = is_disabled,
@@ -7419,6 +7433,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.vcpu_blocking = svm_vcpu_blocking,
.vcpu_unblocking = svm_vcpu_unblocking,
+ .bp_intercepted = svm_bp_intercepted,
.update_bp_intercept = update_bp_intercept,
.get_msr_feature = svm_get_msr_feature,
.get_msr = svm_get_msr,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 079d9fbf278e..eee8d81f7083 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7849,6 +7849,11 @@ static bool vmx_check_apicv_inhibit_reasons(ulong bit)
return supported & BIT(bit);
}
+static bool vmx_bp_intercepted(struct kvm_vcpu *vcpu)
+{
+ return (vmcs_read32(EXCEPTION_BITMAP) & (1u << BP_VECTOR));
+}
+
static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.cpu_has_kvm_support = cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
@@ -7872,6 +7877,7 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.vcpu_load = vmx_vcpu_load,
.vcpu_put = vmx_vcpu_put,
+ .bp_intercepted = vmx_bp_intercepted,
.update_bp_intercept = update_exception_bitmap,
.get_msr_feature = vmx_get_msr_feature,
.get_msr = vmx_get_msr,
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