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KVM: TDX: Skip updating CPU dirty logging request for TDs

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Wrap vmx_update_cpu_dirty_logging so as to ignore requests to update
CPU dirty logging for TDs, as basic TDX does not support the PML feature.
Invoking vmx_update_cpu_dirty_logging() for TDs would cause an incorrect
access to a kvm_vmx struct for a TDX VM, so block that before it happens.

Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2025-02-19 07:43:51 -05:00
parent fbb4adadea
commit 1f62531bc9
1 changed files with 13 additions and 1 deletions
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14
arch/x86/kvm/vmx/main.c
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@@ -129,6 +129,18 @@ static void vt_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
vmx_vcpu_load(vcpu, cpu);
}
static void vt_update_cpu_dirty_logging(struct kvm_vcpu *vcpu)
{
/*
* Basic TDX does not support feature PML. KVM does not enable PML in
* TD's VMCS, nor does it allocate or flush PML buffer for TDX.
*/
if (WARN_ON_ONCE(is_td_vcpu(vcpu)))
return;
vmx_update_cpu_dirty_logging(vcpu);
}
static void vt_flush_tlb_all(struct kvm_vcpu *vcpu)
{
if (is_td_vcpu(vcpu)) {
@@ -322,7 +334,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
.check_intercept = vmx_check_intercept,
.handle_exit_irqoff = vmx_handle_exit_irqoff,
.update_cpu_dirty_logging = vmx_update_cpu_dirty_logging,
.update_cpu_dirty_logging = vt_update_cpu_dirty_logging,
.nested_ops = &vmx_nested_ops,