kvm: x86: do not leak guest xcr0 into host interrupt handlers

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7eb4ebd3ebead4fe10a76bc5efd3ae0d48b95b5b..605cea75eb0d1862f83e885af1efa55c5582707c 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -697,7 +697,6 @@ static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
                if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512)
                        return 1;
        }
-       kvm_put_guest_xcr0(vcpu);
        vcpu->arch.xcr0 = xcr0;
 
        if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND)
@@ -6495,8 +6494,6 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
        kvm_x86_ops->prepare_guest_switch(vcpu);
        if (vcpu->fpu_active)
                kvm_load_guest_fpu(vcpu);
-       kvm_load_guest_xcr0(vcpu);
-
        vcpu->mode = IN_GUEST_MODE;
 
        srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
@@ -6519,6 +6516,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
                goto cancel_injection;
        }
 
+       kvm_load_guest_xcr0(vcpu);
+
        if (req_immediate_exit)
                smp_send_reschedule(vcpu->cpu);
 
@@ -6568,6 +6567,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
        vcpu->mode = OUTSIDE_GUEST_MODE;
        smp_wmb();
 
+       kvm_put_guest_xcr0(vcpu);
+
        /* Interrupt is enabled by handle_external_intr() */
        kvm_x86_ops->handle_external_intr(vcpu);
 
@@ -7215,7 +7216,6 @@ void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
         * and assume host would use all available bits.
         * Guest xcr0 would be loaded later.
         */
-       kvm_put_guest_xcr0(vcpu);
        vcpu->guest_fpu_loaded = 1;
        __kernel_fpu_begin();
        __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu.state);
@@ -7224,8 +7224,6 @@ void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
 
 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
 {
-       kvm_put_guest_xcr0(vcpu);
-
        if (!vcpu->guest_fpu_loaded) {
                vcpu->fpu_counter = 0;
                return;