[PATCH v19 064/130] KVM: x86/mmu: Do not enable page track for TD guest

isaku.yamahata
2024-02-26T08:28:25Z

From: Yan Zhao <yan.y.zhao@intel.com>

TDX does not support write protection and hence page track.
Though !tdp_enabled and kvm_shadow_root_allocated(kvm) are always false
for TD guest, should also return false when external write tracking is
enabled.

Cc: Yuan Yao <yuan.yao@linux.intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
---
v19:
- drop TDX: from the short log
- Added reviewed-by: BinBin
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/mmu/page_track.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
index c87da11f3a04..ce698ab213c1 100644
--- a/arch/x86/kvm/mmu/page_track.c
+++ b/arch/x86/kvm/mmu/page_track.c
@@ -22,6 +22,9 @@

bool kvm_page_track_write_tracking_enabled(struct kvm *kvm)
{
+ if (kvm->arch.vm_type == KVM_X86_TDX_VM)
+ return false;
+
return IS_ENABLED(CONFIG_KVM_EXTERNAL_WRITE_TRACKING) ||
!tdp_enabled || kvm_shadow_root_allocated(kvm);
}
--
2.25.1