Commit 6d15a641 authored by Yan Zhao's avatar Yan Zhao Committed by Paolo Bonzini
Browse files

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



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: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarYan Zhao <yan.y.zhao@intel.com>
Reviewed-by: default avatarBinbin 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: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 2608f105

arch/x86/kvm/mmu/page_track.c

+3 −0
Original line number Diff line number Diff line
@@ -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);



	/*