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KVM: x86/mmu: Do not enable page track for TD guest

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Fail kvm_page_track_write_tracking_enabled() if VM type is TDX to make the
external page track user fail in kvm_page_track_register_notifier() since
TDX does not support write protection and hence page track.

No need to fail KVM internal users of page track (i.e. for shadow page),
because TDX is always with EPT enabled and currently TDX module does not
emulate and send VMLAUNCH/VMRESUME VMExits to VMM.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Cc: Yuan Yao <yuan.yao@linux.intel.com>
Message-ID: <20241112073515.22028-1-yan.y.zhao@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Yan Zhao
2024-11-12 15:35:15 +08:00
committed by Paolo Bonzini
parent 2608f10576
commit 6d15a641fd
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/mmu/page_track.c
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@@ -172,6 +172,9 @@ static int kvm_enable_external_write_tracking(struct kvm *kvm)
struct kvm_memory_slot *slot;
int r = 0, i, bkt;
if (kvm->arch.vm_type == KVM_X86_TDX_VM)
return -EOPNOTSUPP;
mutex_lock(&kvm->slots_arch_lock);
/*