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[v12,29/46] KVM: x86: Expose Hyper-V L2 TLB flush feature

Message ID	20221021153521.1216911-30-vkuznets@redhat.com
State	New
Headers	Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; From: Vitaly Kuznetsov <vkuznets@redhat.com> To: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>, Sean Christopherson <seanjc@google.com> Cc: Wanpeng Li <wanpengli@tencent.com>, Jim Mattson <jmattson@google.com>, Michael Kelley <mikelley@microsoft.com>, Siddharth Chandrasekaran <sidcha@amazon.de>, Yuan Yao <yuan.yao@linux.intel.com>, Maxim Levitsky <mlevitsk@redhat.com>, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v12 29/46] KVM: x86: Expose Hyper-V L2 TLB flush feature Date: Fri, 21 Oct 2022 17:35:04 +0200 Message-Id: <20221021153521.1216911-30-vkuznets@redhat.com> In-Reply-To: <20221021153521.1216911-1-vkuznets@redhat.com> References: <20221021153521.1216911-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Precedence: bulk
Series	KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush features \| [v12,00/46] KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush features [v12,01/46] x86/hyperv: Move VMCB enlightenment definitions to hyperv-tlfs.h [v12,02/46] KVM: selftests: Move "struct hv_enlightenments" to x86_64/svm.h [v12,03/46] KVM: SVM: Add a proper field for Hyper-V VMCB enlightenments [v12,04/46] x86/hyperv: KVM: Rename "hv_enlightenments" to "hv_vmcb_enlightenments" [v12,05/46] KVM: x86: Rename 'enable_direct_tlbflush' to 'enable_l2_tlb_flush' [v12,06/46] KVM: VMX: Rename "vmx/evmcs.{ch}" to "vmx/hyperv.{ch}" [v12,07/46] KVM: x86: Move clearing of TLB_FLUSH_CURRENT to kvm_vcpu_flush_tlb_all() [v12,08/46] KVM: x86: hyper-v: Resurrect dedicated KVM_REQ_HV_TLB_FLUSH flag [v12,09/46] KVM: x86: hyper-v: Introduce TLB flush fifo [v12,10/46] KVM: x86: hyper-v: Add helper to read hypercall data for array [v12,11/46] KVM: x86: hyper-v: Handle HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST{,EX} calls gently [v12,12/46] KVM: x86: hyper-v: Expose support for extended gva ranges for flush hypercalls [v12,13/46] KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs [v12,14/46] x86/hyperv: Introduce HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK constants [v12,15/46] KVM: x86: hyper-v: Use HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK instead of raw… [v12,16/46] KVM: x86: hyper-v: Don't use sparse_set_to_vcpu_mask() in kvm_hv_send_ipi() [v12,17/46] KVM: x86: hyper-v: Create a separate fifo for L2 TLB flush [v12,18/46] KVM: x86: hyper-v: Use preallocated buffer in 'struct kvm_vcpu_hv' instead of on-stack … [v12,19/46] KVM: nVMX: Keep track of hv_vm_id/hv_vp_id when eVMCS is in use [v12,20/46] KVM: nSVM: Keep track of Hyper-V hv_vm_id/hv_vp_id [v12,21/46] KVM: x86: Introduce .hv_inject_synthetic_vmexit_post_tlb_flush() nested hook [v12,22/46] KVM: x86: hyper-v: Introduce kvm_hv_is_tlb_flush_hcall() [v12,23/46] KVM: x86: hyper-v: L2 TLB flush [v12,24/46] KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check [v12,25/46] KVM: nVMX: hyper-v: Cache VP assist page in 'struct kvm_vcpu_hv' [v12,26/46] KVM: nVMX: hyper-v: Enable L2 TLB flush [v12,27/46] KVM: x86: Make kvm_hv_get_assist_page() return 0/-errno [v12,28/46] KVM: nSVM: hyper-v: Enable L2 TLB flush [v12,29/46] KVM: x86: Expose Hyper-V L2 TLB flush feature [v12,30/46] KVM: selftests: Better XMM read/write helpers [v12,31/46] KVM: selftests: Move HYPERV_LINUX_OS_ID definition to a common header [v12,32/46] KVM: selftests: Move the function doing Hyper-V hypercall to a common header [v12,33/46] KVM: selftests: Hyper-V PV IPI selftest [v12,34/46] KVM: selftests: Fill in vm->vpages_mapped bitmap in virt_map() too [v12,35/46] KVM: selftests: Export vm_vaddr_unused_gap() to make it possible to request unmapped ra… [v12,36/46] KVM: selftests: Drop helpers to read/write page table entries [v12,37/46] KVM: selftests: Hyper-V PV TLB flush selftest [v12,38/46] KVM: selftests: Sync 'struct hv_enlightened_vmcs' definition with hyperv-tlfs.h [v12,39/46] KVM: selftests: Sync 'struct hv_vp_assist_page' definition with hyperv-tlfs.h [v12,40/46] KVM: selftests: Move Hyper-V VP assist page enablement out of evmcs.h [v12,41/46] KVM: selftests: Split off load_evmcs() from load_vmcs() [v12,42/46] KVM: selftests: Create a vendor independent helper to allocate Hyper-V specific test pa… [v12,43/46] KVM: selftests: Allocate Hyper-V partition assist page [v12,44/46] KVM: selftests: evmcs_test: Introduce L2 TLB flush test [v12,45/46] KVM: selftests: hyperv_svm_test: Introduce L2 TLB flush test [v12,46/46] KVM: selftests: Rename 'evmcs_test' to 'hyperv_evmcs'

Commit Message

Vitaly Kuznetsov Oct. 21, 2022, 3:35 p.m. UTC

  With both nSVM and nVMX implementations in place, KVM can now expose
Hyper-V L2 TLB flush feature to userspace.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/kvm/hyperv.c | 1 +
 1 file changed, 1 insertion(+)

diff mbox series

Patch

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 404e1a968b02..2464c21feec9 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2772,6 +2772,7 @@  int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
 
 		case HYPERV_CPUID_NESTED_FEATURES:
 			ent->eax = evmcs_ver;
+			ent->eax |= HV_X64_NESTED_DIRECT_FLUSH;
 			ent->eax |= HV_X64_NESTED_MSR_BITMAP;
 			ent->ebx |= HV_X64_NESTED_EVMCS1_PERF_GLOBAL_CTRL;
 			break;