From:   isaku.yamahata@intel.com
To:     kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     isaku.yamahata@intel.com, isaku.yamahata@gmail.com,
        Paolo Bonzini <pbonzini@redhat.com>, erdemaktas@google.com,
        Sean Christopherson <seanjc@google.com>,
        Sagi Shahar <sagis@google.com>,
        David Matlack <dmatlack@google.com>,
        Kai Huang <kai.huang@intel.com>,
        Zhi Wang <zhi.wang.linux@gmail.com>,
        Yan Zhao <yan.y.zhao@intel.com>,
        Yuan Yao <yuan.yao@linux.intel.com>
Subject: [PATCH v12 043/106] KVM: x86/mmu: TDX: Do not enable page track for TD guest
Date:   Mon, 27 Feb 2023 00:22:42 -0800
Message-Id: <29d0cc81c60c2d48c47c2a8fd9243ac9b6bc0e63.1677484918.git.isaku.yamahata@intel.com>
In-Reply-To: <cover.1677484918.git.isaku.yamahata@intel.com>
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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>
---
 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 0a2ac438d647..d738d318ce17 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_PROTECTED_VM)
+		return false;
+
 	return IS_ENABLED(CONFIG_KVM_EXTERNAL_WRITE_TRACKING) ||
 	       !tdp_enabled || kvm_shadow_root_allocated(kvm);
 }
-- 
2.25.1