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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2014-01-04 18:47:19 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-01-17 10:22:13 +0100 |
| commit | 42124925c1f580068661bebd963d7c102175a8a9 (patch) | |
| tree | 2176bdb36a414e2f3feb06d686bdb8d18b203f7b /arch | |
| parent | KVM: VMX: Fix DR6 update on #DB exception (diff) | |
| download | linux-42124925c1f580068661bebd963d7c102175a8a9.tar.xz linux-42124925c1f580068661bebd963d7c102175a8a9.zip | |
KVM: nVMX: Leave VMX mode on clearing of feature control MSR
When userspace sets MSR_IA32_FEATURE_CONTROL to 0, make sure we leave
root and non-root mode, fully disabling VMX. The register state of the
VCPU is undefined after this step, so userspace has to set it to a
proper state afterward.
This enables to reboot a VM while it is running some hypervisor code.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index c8eb27ff1a2d..bff55554faec 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2455,6 +2455,8 @@ static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) return 1; } +static void vmx_leave_nested(struct kvm_vcpu *vcpu); + static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) { u32 msr_index = msr_info->index; @@ -2470,6 +2472,8 @@ static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) & FEATURE_CONTROL_LOCKED) return 0; to_vmx(vcpu)->nested.msr_ia32_feature_control = data; + if (host_initialized && data == 0) + vmx_leave_nested(vcpu); return 1; } @@ -8504,6 +8508,16 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu) } /* + * Forcibly leave nested mode in order to be able to reset the VCPU later on. + */ +static void vmx_leave_nested(struct kvm_vcpu *vcpu) +{ + if (is_guest_mode(vcpu)) + nested_vmx_vmexit(vcpu); + free_nested(to_vmx(vcpu)); +} + +/* * L1's failure to enter L2 is a subset of a normal exit, as explained in * 23.7 "VM-entry failures during or after loading guest state" (this also * lists the acceptable exit-reason and exit-qualification parameters). |