Received-SPF: pass (google.com: domain of linux-kernel+bounces-80828-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
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>,
	Kai Huang <kai.huang@intel.com>,
	chen.bo@intel.com,
	hang.yuan@intel.com,
	tina.zhang@intel.com,
	Yan Zhao <yan.y.zhao@intel.com>,
	Yuan Yao <yuan.yao@linux.intel.com>,
	Binbin Wu <binbin.wu@linux.intel.com>
Subject: [PATCH v19 064/130] KVM: x86/mmu: Do not enable page track for TD guest
Date: Mon, 26 Feb 2024 00:26:06 -0800
Message-Id: <066ce30f61d65f3a5e701f0cf1c2f71fa3df2a0d.1708933498.git.isaku.yamahata@intel.com>
In-Reply-To: <cover.1708933498.git.isaku.yamahata@intel.com>
References: <cover.1708933498.git.isaku.yamahata@intel.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

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