linux-kernel - [PATCH v2 10/31] KVM: nSVM: Keep track of Hyper-V hv_vm_id/hv_vp

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Date:   Thu,  7 Apr 2022 17:56:24 +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 10/31] KVM: nSVM: Keep track of Hyper-V hv_vm_id/hv_vp_id

Similar to nSVM, KVM needs to know L2's VM_ID/VP_ID and Partition
assist page address to handle Direct TLB flush requests.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kvm/svm/hyperv.h | 16 ++++++++++++++++
 arch/x86/kvm/svm/nested.c |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/arch/x86/kvm/svm/hyperv.h b/arch/x86/kvm/svm/hyperv.h
index 7d6d97968fb9..8cf702fed7e5 100644
--- a/arch/x86/kvm/svm/hyperv.h
+++ b/arch/x86/kvm/svm/hyperv.h
@@ -9,6 +9,7 @@
 #include <asm/mshyperv.h>
 
 #include "../hyperv.h"
+#include "svm.h"
 
 /*
  * Hyper-V uses the software reserved 32 bytes in VMCB
@@ -32,4 +33,19 @@ struct hv_enlightenments {
  */
 #define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW
 
+static inline void nested_svm_hv_update_vm_vp_ids(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_svm *svm = to_svm(vcpu);
+	struct hv_enlightenments *hve =
+		(struct hv_enlightenments *)svm->nested.ctl.reserved_sw;
+	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
+
+	if (!hv_vcpu)
+		return;
+
+	hv_vcpu->nested.pa_page_gpa = hve->partition_assist_page;
+	hv_vcpu->nested.vm_id = hve->hv_vm_id;
+	hv_vcpu->nested.vp_id = hve->hv_vp_id;
+}
+
 #endif /* __ARCH_X86_KVM_SVM_HYPERV_H__ */
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 73b545278f5f..ee75061a7ea3 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -827,6 +827,8 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu)
 
 	svm->nested.nested_run_pending = 1;
 
+	nested_svm_hv_update_vm_vp_ids(vcpu);
+
 	if (enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12, true))
 		goto out_exit_err;
 
-- 
2.35.1