linux-kernel - [PATCH v11 106/113] KVM: TDX: Add methods to ignore VMX preemption timer

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Message-Id: <b638aa01d9e8769b4afde34211180627e384119f.1673539699.git.isaku.yamahata@intel.com>
Date:   Thu, 12 Jan 2023 08:32:54 -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 106/113] KVM: TDX: Add methods to ignore VMX preemption timer

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

TDX doesn't support VMX preemption timer.  Implement access methods for VMM
to ignore VMX preemption timer.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/main.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
index cbac63170cea..2d2738e8c0b1 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -738,6 +738,27 @@ static void vt_update_cpu_dirty_logging(struct kvm_vcpu *vcpu)
 	vmx_update_cpu_dirty_logging(vcpu);
 }
 
+#ifdef CONFIG_X86_64
+static int vt_set_hv_timer(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc,
+			      bool *expired)
+{
+	/* VMX-preemption timer isn't available for TDX. */
+	if (is_td_vcpu(vcpu))
+		return -EINVAL;
+
+	return vmx_set_hv_timer(vcpu, guest_deadline_tsc, expired);
+}
+
+static void vt_cancel_hv_timer(struct kvm_vcpu *vcpu)
+{
+	/* VMX-preemption timer can't be set.  See vt_set_hv_timer(). */
+	if (KVM_BUG_ON(is_td_vcpu(vcpu), vcpu->kvm))
+		return;
+
+	vmx_cancel_hv_timer(vcpu);
+}
+#endif
+
 static void vt_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
 			u64 *info1, u64 *info2, u32 *intr_info, u32 *error_code)
 {
@@ -889,8 +910,8 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
 	.pi_start_assignment = vmx_pi_start_assignment,
 
 #ifdef CONFIG_X86_64
-	.set_hv_timer = vmx_set_hv_timer,
-	.cancel_hv_timer = vmx_cancel_hv_timer,
+	.set_hv_timer = vt_set_hv_timer,
+	.cancel_hv_timer = vt_cancel_hv_timer,
 #endif
 
 	.setup_mce = vmx_setup_mce,
-- 
2.25.1