linux-kernel - [PATCH v13 104/113] KVM: TDX: Add a method to ignore dirty logging

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Message-Id: <6dff4dcc9843f5bf6d85bdabaf439d670c154fde.1678643052.git.isaku.yamahata@intel.com>
Date:   Sun, 12 Mar 2023 10:57:08 -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>
Subject: [PATCH v13 104/113] 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 59fa63146c8d..c9bbee1b69e9 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -828,6 +828,14 @@ 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, true);
 }
 
+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 int vt_mem_enc_ioctl(struct kvm *kvm, void __user *argp)
 {
 	if (!is_td(kvm))
@@ -972,7 +980,7 @@ 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