From: Joerg Roedel <joerg.roedel@xxxxxxx>
This patch adds a function to recalculate the effective
intercepts masks when the vcpu is in guest-mode and either
the host or the guest intercept masks change.
Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d512efb..05b525c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -192,6 +192,26 @@ static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
return container_of(vcpu, struct vcpu_svm, vcpu);
}
+static void recalc_intercepts(struct vcpu_svm *svm)
+{
+ struct vmcb_control_area *c, *h;
+ struct nested_state *g;
+
+ if (!is_guest_mode(&svm->vcpu))
+ return;
+
+ c = &svm->vmcb->control;
+ h = &svm->nested.hsave->control;
+ g = &svm->nested;
+
+ c->intercept_cr_read = h->intercept_cr_read | g->intercept_cr_read;
+ c->intercept_cr_write = h->intercept_cr_write | g->intercept_cr_write;
+ c->intercept_dr_read = h->intercept_dr_read | g->intercept_dr_read;
+ c->intercept_dr_write = h->intercept_dr_write | g->intercept_dr_write;
+ c->intercept_exceptions = h->intercept_exceptions | g->intercept_exceptions;
+ c->intercept = h->intercept | g->intercept;
+}
+
static inline void enable_gif(struct vcpu_svm *svm)
{
svm->vcpu.arch.hflags |= HF_GIF_MASK;
@@ -2273,23 +2293,6 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
/* We don't want to see VMMCALLs from a nested guest */
svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMMCALL);
- /*
- * We don't want a nested guest to be more powerful than the guest, so
- * all intercepts are ORed
- */
- svm->vmcb->control.intercept_cr_read |=
- nested_vmcb->control.intercept_cr_read;
- svm->vmcb->control.intercept_cr_write |=
- nested_vmcb->control.intercept_cr_write;
- svm->vmcb->control.intercept_dr_read |=
- nested_vmcb->control.intercept_dr_read;
- svm->vmcb->control.intercept_dr_write |=
- nested_vmcb->control.intercept_dr_write;
- svm->vmcb->control.intercept_exceptions |=
- nested_vmcb->control.intercept_exceptions;
-
- svm->vmcb->control.intercept |= nested_vmcb->control.intercept;
-
svm->vmcb->control.lbr_ctl = nested_vmcb->control.lbr_ctl;
svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
svm->vmcb->control.int_state = nested_vmcb->control.int_state;
@@ -2302,6 +2305,12 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
/* Enter Guest-Mode */
enter_guest_mode(&svm->vcpu);
+ /*
+ * Merge guest and host intercepts - must be called with vcpu in
+ * guest-mode to take affect here
+ */
+ recalc_intercepts(svm);
+
svm->nested.vmcb = vmcb_gpa;
enable_gif(svm);
--
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