From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Add a flag to disallow MCE injection and reject KVM_X86_SETUP_MCE with
-EINVAL when set. TDX doesn't support injecting exceptions, including
(virtual) #MCs.
Signed-off-by: Kai Huang <kai.huang@xxxxxxxxxxxxxxx>
Co-developed-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/x86.c | 14 +++++++-------
2 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e8180a1fe610..70528102d865 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -996,6 +996,7 @@ struct kvm_arch {
bool guest_state_protected;
bool irq_injection_disallowed;
+ bool mce_injection_disallowed;
struct kvm_pmu_event_filter *pmu_event_filter;
struct task_struct *nx_lpage_recovery_thread;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ec66d5d53a1a..2fb0d20c5788 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4095,15 +4095,16 @@ static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
u64 mcg_cap)
{
- int r;
unsigned bank_num = mcg_cap & 0xff, bank;
- r = -EINVAL;
+ if (vcpu->kvm->arch.mce_injection_disallowed)
+ return -EINVAL;
+
if (!bank_num || bank_num > KVM_MAX_MCE_BANKS)
- goto out;
+ return -EINVAL;
if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000))
- goto out;
- r = 0;
+ return -EINVAL;
+
vcpu->arch.mcg_cap = mcg_cap;
/* Init IA32_MCG_CTL to all 1s */
if (mcg_cap & MCG_CTL_P)
@@ -4113,8 +4114,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
vcpu->arch.mce_banks[bank*4] = ~(u64)0;
kvm_x86_ops.setup_mce(vcpu);
-out:
- return r;
+ return 0;
}
static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
--
2.17.1
