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[v13,29/48] KVM: x86: Expose Hyper-V L2 TLB flush feature

Message ID	20221101145426.251680-30-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 v13 29/48] KVM: x86: Expose Hyper-V L2 TLB flush feature Date: Tue, 1 Nov 2022 15:54:07 +0100 Message-Id: <20221101145426.251680-30-vkuznets@redhat.com> In-Reply-To: <20221101145426.251680-1-vkuznets@redhat.com> References: <20221101145426.251680-1-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 \| [v13,00/48] KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush features [v13,01/48] x86/hyperv: Move VMCB enlightenment definitions to hyperv-tlfs.h [v13,02/48] KVM: selftests: Move "struct hv_enlightenments" to x86_64/svm.h [v13,03/48] KVM: SVM: Add a proper field for Hyper-V VMCB enlightenments [v13,04/48] x86/hyperv: KVM: Rename "hv_enlightenments" to "hv_vmcb_enlightenments" [v13,05/48] KVM: x86: Rename 'enable_direct_tlbflush' to 'enable_l2_tlb_flush' [v13,06/48] KVM: VMX: Rename "vmx/evmcs.{ch}" to "vmx/hyperv.{ch}" [v13,07/48] KVM: x86: Move clearing of TLB_FLUSH_CURRENT to kvm_vcpu_flush_tlb_all() [v13,08/48] KVM: x86: hyper-v: Resurrect dedicated KVM_REQ_HV_TLB_FLUSH flag [v13,09/48] KVM: x86: hyper-v: Introduce TLB flush fifo [v13,10/48] KVM: x86: hyper-v: Add helper to read hypercall data for array [v13,11/48] KVM: x86: hyper-v: Handle HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST{,EX} calls gently [v13,12/48] KVM: x86: hyper-v: Expose support for extended gva ranges for flush hypercalls [v13,13/48] KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs [v13,14/48] x86/hyperv: Introduce HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK constants [v13,15/48] KVM: x86: hyper-v: Use HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK instead of raw… [v13,16/48] KVM: x86: hyper-v: Don't use sparse_set_to_vcpu_mask() in kvm_hv_send_ipi() [v13,17/48] KVM: x86: hyper-v: Create a separate fifo for L2 TLB flush [v13,18/48] KVM: x86: hyper-v: Use preallocated buffer in 'struct kvm_vcpu_hv' instead of on-stack … [v13,19/48] KVM: nVMX: Keep track of hv_vm_id/hv_vp_id when eVMCS is in use [v13,20/48] KVM: nSVM: Keep track of Hyper-V hv_vm_id/hv_vp_id [v13,21/48] KVM: x86: Introduce .hv_inject_synthetic_vmexit_post_tlb_flush() nested hook [v13,22/48] KVM: x86: hyper-v: Introduce kvm_hv_is_tlb_flush_hcall() [v13,23/48] KVM: x86: hyper-v: L2 TLB flush [v13,24/48] KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check [v13,25/48] KVM: nVMX: hyper-v: Cache VP assist page in 'struct kvm_vcpu_hv' [v13,26/48] KVM: nVMX: hyper-v: Enable L2 TLB flush [v13,27/48] KVM: x86: Make kvm_hv_get_assist_page() return 0/-errno [v13,28/48] KVM: nSVM: hyper-v: Enable L2 TLB flush [v13,29/48] KVM: x86: Expose Hyper-V L2 TLB flush feature [v13,30/48] KVM: selftests: Better XMM read/write helpers [v13,31/48] KVM: selftests: Move HYPERV_LINUX_OS_ID definition to a common header [v13,32/48] KVM: selftests: Move the function doing Hyper-V hypercall to a common header [v13,33/48] KVM: selftests: Hyper-V PV IPI selftest [v13,34/48] KVM: selftests: Fill in vm->vpages_mapped bitmap in virt_map() too [v13,35/48] KVM: selftests: Export vm_vaddr_unused_gap() to make it possible to request unmapped ra… [v13,36/48] KVM: selftests: Drop helpers to read/write page table entries [v13,37/48] KVM: selftests: Hyper-V PV TLB flush selftest [v13,38/48] KVM: selftests: Sync 'struct hv_enlightened_vmcs' definition with hyperv-tlfs.h [v13,39/48] KVM: selftests: Sync 'struct hv_vp_assist_page' definition with hyperv-tlfs.h [v13,40/48] KVM: selftests: Move Hyper-V VP assist page enablement out of evmcs.h [v13,41/48] KVM: selftests: Split off load_evmcs() from load_vmcs() [v13,42/48] KVM: selftests: Create a vendor independent helper to allocate Hyper-V specific test pa… [v13,43/48] KVM: selftests: Allocate Hyper-V partition assist page [v13,44/48] KVM: selftests: Stuff RAX/RCX with 'safe' values in vmmcall()/vmcall() [v13,45/48] KVM: selftests: Introduce rdmsr_from_l2() and use it for MSR-Bitmap tests [v13,46/48] KVM: selftests: evmcs_test: Introduce L2 TLB flush test [v13,47/48] KVM: selftests: hyperv_svm_test: Introduce L2 TLB flush test [v13,48/48] KVM: selftests: Rename 'evmcs_test' to 'hyperv_evmcs'

Commit Message

Vitaly Kuznetsov Nov. 1, 2022, 2:54 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>
Reviewed-by: Sean Christopherson <seanjc@google.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 15880da73a7b..2c7f2a26421e 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2779,6 +2779,7 @@  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;