linux-kernel - [PATCH v2 09/31] KVM: nVMX: Keep track of hv_vm_id/hv_vp

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Message-Id: <20220407155645.940890-10-vkuznets@redhat.com>
Date:   Thu,  7 Apr 2022 17:56:23 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 09/31] KVM: nVMX: Keep track of hv_vm_id/hv_vp_id when eVMCS is in use

To handle Direct TLB flush requests from L2, KVM needs to keep track
of L2's VM_ID/VP_IDs which are set by L1 hypervisor. 'Partition assist
page' address is also needed to handle post-flush exit to L1 upon
request.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/include/asm/kvm_host.h |  6 ++++++
 arch/x86/kvm/vmx/nested.c       | 15 +++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4458abc1d41d..01f094a2208f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -622,6 +622,12 @@ struct kvm_vcpu_hv {
 
 	/* Preallocated buffer for handling hypercalls passing sparse vCPU set */
 	u64 sparse_banks[64];
+
+	struct {
+		u64 pa_page_gpa;
+		u64 vm_id;
+		u32 vp_id;
+	} nested;
 };
 
 /* Xen HVM per vcpu emulation context */
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index f18744f7ff82..4075cf8d61f4 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -225,6 +225,7 @@ static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx)
 
 static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 {
+	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 
 	if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
@@ -233,6 +234,12 @@ static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 	}
 
 	vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;
+
+	if (hv_vcpu) {
+		hv_vcpu->nested.pa_page_gpa = INVALID_GPA;
+		hv_vcpu->nested.vm_id = 0;
+		hv_vcpu->nested.vp_id = 0;
+	}
 }
 
 static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
@@ -1592,11 +1599,19 @@ static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields
 {
 	struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
 	struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
+	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(&vmx->vcpu);
 
 	/* HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE */
 	vmcs12->tpr_threshold = evmcs->tpr_threshold;
 	vmcs12->guest_rip = evmcs->guest_rip;
 
+	if (unlikely(!(hv_clean_fields &
+		       HV_VMX_ENLIGHTENED_CLEAN_FIELD_ENLIGHTENMENTSCONTROL))) {
+		hv_vcpu->nested.pa_page_gpa = evmcs->partition_assist_page;
+		hv_vcpu->nested.vm_id = evmcs->hv_vm_id;
+		hv_vcpu->nested.vp_id = evmcs->hv_vp_id;
+	}
+
 	if (unlikely(!(hv_clean_fields &
 		       HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_BASIC))) {
 		vmcs12->guest_rsp = evmcs->guest_rsp;
-- 
2.35.1