KVM: handle exit due to INVD in VMX

Currently the exit is unhandled, so guest halts with error if it tries
to execute INVD instruction. Call into emulator when INVD instruction
is executed by a guest instead. This instruction is not needed by ordinary
guests, but firmware (like OpenBIOS) use it and fail.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e42727b305cb..12c30733e239 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3349,6 +3349,11 @@ static int handle_vmx_insn(struct kvm_vcpu *vcpu)
         return 1;
 }
 
+static int handle_invd(struct kvm_vcpu *vcpu)
+{
+        return emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE;
+}
+
 static int handle_invlpg(struct kvm_vcpu *vcpu)
 {
         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@@ -3649,6 +3654,7 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
         [EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
         [EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
         [EXIT_REASON_HLT]                     = handle_halt,
+        [EXIT_REASON_INVD]                    = handle_invd,
         [EXIT_REASON_INVLPG]                  = handle_invlpg,
         [EXIT_REASON_VMCALL]                  = handle_vmcall,
         [EXIT_REASON_VMCLEAR]                 = handle_vmx_insn,