linux-kernel - [PATCH v11 105/113] KVM: TDX: Add a method to ignore dirty logging

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Message-Id: <a9b8397c82488c17739ffd59c35a5667e4d90ac5.1673539699.git.isaku.yamahata@intel.com>
Date:   Thu, 12 Jan 2023 08:32:53 -0800
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>
Subject: [PATCH v11 105/113] KVM: TDX: Add a method to ignore dirty logging

From: Isaku Yamahata <isaku.yamahata@...el.com>

Currently TDX KVM doesn't support tracking dirty pages (yet).  Implement a
method to ignore it.  Because the flag for kvm memory slot to enable dirty
logging isn't accepted for TDX, warn on the method is called for TDX.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
index 47c2b6e1e484..cbac63170cea 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -730,6 +730,14 @@ static u8 vt_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
 	return vmx_get_mt_mask(vcpu, gfn, is_mmio);
 }
 
+static void vt_update_cpu_dirty_logging(struct kvm_vcpu *vcpu)
+{
+	if (KVM_BUG_ON(is_td_vcpu(vcpu), vcpu->kvm))
+		return;
+
+	vmx_update_cpu_dirty_logging(vcpu);
+}
+
 static void vt_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
 			u64 *info1, u64 *info2, u32 *intr_info, u32 *error_code)
 {
@@ -873,7 +881,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
 	.sched_in = vt_sched_in,
 
 	.cpu_dirty_log_size = PML_ENTITY_NUM,
-	.update_cpu_dirty_logging = vmx_update_cpu_dirty_logging,
+	.update_cpu_dirty_logging = vt_update_cpu_dirty_logging,
 
 	.nested_ops = &vmx_nested_ops,
 
-- 
2.25.1