linux-kernel - [PATCH v15 048/115] KVM: x86/mmu: TDX: Do not enable page track for TD guest

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Message-Id: <c66cc7ce9a8de7819ece76ac1d8f8496562a312f.1690322424.git.isaku.yamahata@intel.com>
Date:   Tue, 25 Jul 2023 15:13:59 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        hang.yuan@...el.com, tina.zhang@...el.com,
        Yan Zhao <yan.y.zhao@...el.com>,
        Yuan Yao <yuan.yao@...ux.intel.com>
Subject: [PATCH v15 048/115] KVM: x86/mmu: TDX: Do not enable page track for TD guest

From: Yan Zhao <yan.y.zhao@...el.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@...ux.intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.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..571c2c40004a 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