linux-kernel - [RFC 16/26] KVM: VMX: Update HFI table when vCPU migrates

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Date: Sat,  3 Feb 2024 17:12:04 +0800
From: Zhao Liu <zhao1.liu@...ux.intel.com>
To: Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	kvm@...r.kernel.org,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	x86@...nel.org
Cc: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
	Len Brown <len.brown@...el.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Zhenyu Wang <zhenyu.z.wang@...el.com>,
	Zhuocheng Ding <zhuocheng.ding@...el.com>,
	Dapeng Mi <dapeng1.mi@...el.com>,
	Yanting Jiang <yanting.jiang@...el.com>,
	Yongwei Ma <yongwei.ma@...el.com>,
	Vineeth Pillai <vineeth@...byteword.org>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Masami Hiramatsu <mhiramat@...gle.com>,
	David Dai <davidai@...gle.com>,
	Saravana Kannan <saravanak@...gle.com>,
	Zhao Liu <zhao1.liu@...el.com>
Subject: [RFC 16/26] KVM: VMX: Update HFI table when vCPU migrates

From: Zhuocheng Ding <zhuocheng.ding@...el.com>

When the vCPU migrates to a different pCPU, the virtual hfi data
corresponding to the vCPU's hfi index should be updated to the new
pCPU's data.

We don't need to re-register HFI notifier because currently ITD/HFI
virtualization is only supported for client platforms (with only one
HFI instance).

In this case, make the request to update the virtual hfi table.

Tested-by: Yanting Jiang <yanting.jiang@...el.com>
Signed-off-by: Zhuocheng Ding <zhuocheng.ding@...el.com>
Co-developed-by: Zhao Liu <zhao1.liu@...el.com>
Signed-off-by: Zhao Liu <zhao1.liu@...el.com>
---
 arch/x86/kvm/vmx/vmx.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 0ad5e3473a28..44c09c995120 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1735,6 +1735,17 @@ static void vmx_dynamic_update_hfi_table(struct kvm_vcpu *vcpu)
 	mutex_unlock(&kvm_vmx->pkg_therm.pkg_therm_lock);
 }
 
+static void vmx_vcpu_hfi_load(struct kvm_vcpu *vcpu, int cpu)
+{
+	if (!intel_hfi_enabled())
+		return;
+
+	if (!vmx_hfi_initialized(to_kvm_vmx(vcpu->kvm)))
+		return;
+
+	kvm_make_request(KVM_REQ_HFI_UPDATE, vcpu);
+}
+
 /*
  * Switches to specified vcpu, until a matching vcpu_put(), but assumes
  * vcpu mutex is already taken.
@@ -1748,6 +1759,9 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	vmx_vcpu_pi_load(vcpu, cpu);
 
 	vmx->host_debugctlmsr = get_debugctlmsr();
+
+	if (unlikely(vcpu->cpu != cpu))
+		vmx_vcpu_hfi_load(vcpu, cpu);
 }
 
 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
-- 
2.34.1