linux-kernel - [PATCH 26/31] KVM: selftests: nVMX: Allocate Hyper-V partition assist page

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Date:   Fri, 11 Mar 2022 16:49:38 +0100
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>,
        linux-hyperv@...r.kernel.org,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 26/31] KVM: selftests: nVMX: Allocate Hyper-V partition assist page

In preparation to testing Hyper-V Direct TLB flush hypercalls,
allocate so-called Partition assist page and link it to 'struct
vmx_pages'.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 tools/testing/selftests/kvm/include/x86_64/vmx.h | 4 ++++
 tools/testing/selftests/kvm/lib/x86_64/vmx.c     | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/x86_64/vmx.h b/tools/testing/selftests/kvm/include/x86_64/vmx.h
index 583ceb0d1457..f99922ca8259 100644
--- a/tools/testing/selftests/kvm/include/x86_64/vmx.h
+++ b/tools/testing/selftests/kvm/include/x86_64/vmx.h
@@ -567,6 +567,10 @@ struct vmx_pages {
 	uint64_t enlightened_vmcs_gpa;
 	void *enlightened_vmcs;
 
+	void *partition_assist_hva;
+	uint64_t partition_assist_gpa;
+	void *partition_assist;
+
 	void *eptp_hva;
 	uint64_t eptp_gpa;
 	void *eptp;
diff --git a/tools/testing/selftests/kvm/lib/x86_64/vmx.c b/tools/testing/selftests/kvm/lib/x86_64/vmx.c
index d089d8b850b5..3db21e0e1a8f 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/vmx.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/vmx.c
@@ -124,6 +124,13 @@ vcpu_alloc_vmx(struct kvm_vm *vm, vm_vaddr_t *p_vmx_gva)
 	vmx->enlightened_vmcs_gpa =
 		addr_gva2gpa(vm, (uintptr_t)vmx->enlightened_vmcs);
 
+	/* Setup of a region of guest memory for the partition assist page. */
+	vmx->partition_assist = (void *)vm_vaddr_alloc_page(vm);
+	vmx->partition_assist_hva =
+		addr_gva2hva(vm, (uintptr_t)vmx->partition_assist);
+	vmx->partition_assist_gpa =
+		addr_gva2gpa(vm, (uintptr_t)vmx->partition_assist);
+
 	*p_vmx_gva = vmx_gva;
 	return vmx;
 }
-- 
2.35.1