diff mbox series

[v10,22/39] KVM: x86: Expose Hyper-V L2 TLB flush feature

Message ID	20220921152436.3673454-23-vkuznets@redhat.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <kvm-owner@kernel.org> From: Vitaly Kuznetsov <vkuznets@redhat.com> To: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com> Cc: Sean Christopherson <seanjc@google.com>, 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 v10 22/39] KVM: x86: Expose Hyper-V L2 TLB flush feature Date: Wed, 21 Sep 2022 17:24:19 +0200 Message-Id: <20220921152436.3673454-23-vkuznets@redhat.com> In-Reply-To: <20220921152436.3673454-1-vkuznets@redhat.com> References: <20220921152436.3673454-1-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 \| expand [v10,00/39] KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush features [v10,01/39] KVM: x86: Rename 'enable_direct_tlbflush' to 'enable_l2_tlb_flush' [v10,02/39] KVM: x86: hyper-v: Resurrect dedicated KVM_REQ_HV_TLB_FLUSH flag [v10,03/39] KVM: x86: hyper-v: Introduce TLB flush fifo [v10,04/39] KVM: x86: hyper-v: Add helper to read hypercall data for array [v10,05/39] KVM: x86: hyper-v: Handle HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST{,EX} calls gently [v10,06/39] KVM: x86: hyper-v: Expose support for extended gva ranges for flush hypercalls [v10,07/39] KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs [v10,08/39] x86/hyperv: Introduce HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK constants [v10,09/39] KVM: x86: hyper-v: Use HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK instead of raw… [v10,10/39] KVM: x86: hyper-v: Don't use sparse_set_to_vcpu_mask() in kvm_hv_send_ipi() [v10,11/39] KVM: x86: hyper-v: Create a separate fifo for L2 TLB flush [v10,12/39] KVM: x86: hyper-v: Use preallocated buffer in 'struct kvm_vcpu_hv' instead of on-stack … [v10,13/39] KVM: nVMX: Keep track of hv_vm_id/hv_vp_id when eVMCS is in use [v10,14/39] KVM: nSVM: Keep track of Hyper-V hv_vm_id/hv_vp_id [v10,15/39] KVM: x86: Introduce .hv_inject_synthetic_vmexit_post_tlb_flush() nested hook [v10,16/39] KVM: x86: hyper-v: Introduce kvm_hv_is_tlb_flush_hcall() [v10,17/39] KVM: x86: hyper-v: L2 TLB flush [v10,18/39] KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check [v10,19/39] KVM: nVMX: hyper-v: Cache VP assist page in 'struct kvm_vcpu_hv' [v10,20/39] KVM: nVMX: hyper-v: Enable L2 TLB flush [v10,21/39] KVM: nSVM: hyper-v: Enable L2 TLB flush [v10,22/39] KVM: x86: Expose Hyper-V L2 TLB flush feature [v10,23/39] KVM: selftests: Better XMM read/write helpers [v10,24/39] KVM: selftests: Move HYPERV_LINUX_OS_ID definition to a common header [v10,25/39] KVM: selftests: Move the function doing Hyper-V hypercall to a common header [v10,26/39] KVM: selftests: Hyper-V PV IPI selftest [v10,27/39] KVM: selftests: Fill in vm->vpages_mapped bitmap in virt_map() too [v10,28/39] KVM: selftests: Export vm_vaddr_unused_gap() to make it possible to request unmapped ra… [v10,29/39] KVM: selftests: Export _vm_get_page_table_entry() [v10,30/39] KVM: selftests: Hyper-V PV TLB flush selftest [v10,31/39] KVM: selftests: Sync 'struct hv_enlightened_vmcs' definition with hyperv-tlfs.h [v10,32/39] KVM: selftests: Sync 'struct hv_vp_assist_page' definition with hyperv-tlfs.h [v10,33/39] KVM: selftests: Move Hyper-V VP assist page enablement out of evmcs.h [v10,34/39] KVM: selftests: Split off load_evmcs() from load_vmcs() [v10,35/39] KVM: selftests: Create a vendor independent helper to allocate Hyper-V specific test pa… [v10,36/39] KVM: selftests: Allocate Hyper-V partition assist page [v10,37/39] KVM: selftests: evmcs_test: Introduce L2 TLB flush test [v10,38/39] KVM: selftests: hyperv_svm_test: Introduce L2 TLB flush test [v10,39/39] KVM: selftests: Rename 'evmcs_test' to 'hyperv_evmcs'

Commit Message

Vitaly Kuznetsov Sept. 21, 2022, 3:24 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 8ae32ec87efb..1eb2e3c8b392 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2764,6 +2764,7 @@  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;