All of lore.kernel.org
 help / color / mirror / Atom feed
From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Maxim Levitsky <mlevitsk@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	Michael Kelley <mikelley@microsoft.com>,
	Siddharth Chandrasekaran <sidcha@amazon.de>,
	linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v4 18/37] KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check
Date: Wed, 25 May 2022 11:01:14 +0200	[thread overview]
Message-ID: <20220525090133.1264239-19-vkuznets@redhat.com> (raw)
In-Reply-To: <20220525090133.1264239-1-vkuznets@redhat.com>

Introduce a helper to quickly check if KVM needs to handle VMCALL/VMMCALL
from L2 in L0 to process L2 TLB flush requests.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/include/asm/kvm_host.h | 1 +
 arch/x86/kvm/hyperv.c           | 6 ++++++
 arch/x86/kvm/hyperv.h           | 7 +++++++
 3 files changed, 14 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 19b62589bb2c..c8e75f529b9d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -639,6 +639,7 @@ struct kvm_vcpu_hv {
 		u32 enlightenments_eax; /* HYPERV_CPUID_ENLIGHTMENT_INFO.EAX */
 		u32 enlightenments_ebx; /* HYPERV_CPUID_ENLIGHTMENT_INFO.EBX */
 		u32 syndbg_cap_eax; /* HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX */
+		u32 nested_features_eax; /* HYPERV_CPUID_NESTED_FEATURES.EAX */
 	} cpuid_cache;
 
 	struct kvm_vcpu_hv_tlb_flush_fifo tlb_flush_fifo[HV_NR_TLB_FLUSH_FIFOS];
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index e3fedc89d84b..9a41835ff4bc 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2229,6 +2229,12 @@ void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu)
 		hv_vcpu->cpuid_cache.syndbg_cap_eax = entry->eax;
 	else
 		hv_vcpu->cpuid_cache.syndbg_cap_eax = 0;
+
+	entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_NESTED_FEATURES, 0);
+	if (entry)
+		hv_vcpu->cpuid_cache.nested_features_eax = entry->eax;
+	else
+		hv_vcpu->cpuid_cache.nested_features_eax = 0;
 }
 
 int kvm_hv_set_enforce_cpuid(struct kvm_vcpu *vcpu, bool enforce)
diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
index b6583d02b2ea..9c9b842bbd73 100644
--- a/arch/x86/kvm/hyperv.h
+++ b/arch/x86/kvm/hyperv.h
@@ -169,6 +169,13 @@ static inline void kvm_hv_vcpu_empty_flush_tlb(struct kvm_vcpu *vcpu)
 	kfifo_reset_out(&tlb_flush_fifo->entries);
 }
 
+static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu)
+{
+	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
+
+	return hv_vcpu && (hv_vcpu->cpuid_cache.nested_features_eax & HV_X64_NESTED_DIRECT_FLUSH);
+}
+
 static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu)
 {
 	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
-- 
2.35.3


  parent reply	other threads:[~2022-05-25  9:07 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-25  9:00 [PATCH v4 00/37] KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush features Vitaly Kuznetsov
2022-05-25  9:00 ` [PATCH v4 01/37] KVM: x86: Rename 'enable_direct_tlbflush' to 'enable_l2_tlb_flush' Vitaly Kuznetsov
2022-05-25  9:00 ` [PATCH v4 02/37] KVM: x86: hyper-v: Resurrect dedicated KVM_REQ_HV_TLB_FLUSH flag Vitaly Kuznetsov
2022-05-27  3:00   ` Yuan Yao
2022-05-25  9:00 ` [PATCH v4 03/37] KVM: x86: hyper-v: Introduce TLB flush fifo Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 04/37] KVM: x86: hyper-v: Add helper to read hypercall data for array Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 05/37] KVM: x86: hyper-v: Handle HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST{,EX} calls gently Vitaly Kuznetsov
2022-05-27  8:39   ` Yuan Yao
2022-05-27 11:43     ` Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 06/37] KVM: x86: hyper-v: Expose support for extended gva ranges for flush hypercalls Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 07/37] KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 08/37] x86/hyperv: Introduce HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK constants Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 09/37] KVM: x86: hyper-v: Use HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK instead of raw '64' Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 10/37] KVM: x86: hyper-v: Don't use sparse_set_to_vcpu_mask() in kvm_hv_send_ipi() Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 11/37] KVM: x86: hyper-v: Create a separate fifo for L2 TLB flush Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 12/37] KVM: x86: hyper-v: Use preallocated buffer in 'struct kvm_vcpu_hv' instead of on-stack 'sparse_banks' Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 13/37] KVM: nVMX: Keep track of hv_vm_id/hv_vp_id when eVMCS is in use Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 14/37] KVM: nSVM: Keep track of Hyper-V hv_vm_id/hv_vp_id Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 15/37] KVM: x86: Introduce .hv_inject_synthetic_vmexit_post_tlb_flush() nested hook Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 16/37] KVM: x86: hyper-v: Introduce kvm_hv_is_tlb_flush_hcall() Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 17/37] KVM: x86: hyper-v: L2 TLB flush Vitaly Kuznetsov
2022-05-25  9:01 ` Vitaly Kuznetsov [this message]
2022-05-25  9:01 ` [PATCH v4 19/37] x86/hyperv: Fix 'struct hv_enlightened_vmcs' definition Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 20/37] KVM: nVMX: hyper-v: Enable L2 TLB flush Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 21/37] KVM: nSVM: " Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 22/37] KVM: x86: Expose Hyper-V L2 TLB flush feature Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 23/37] KVM: selftests: Better XMM read/write helpers Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 24/37] KVM: selftests: Move HYPERV_LINUX_OS_ID definition to a common header Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 25/37] KVM: selftests: Move the function doing Hyper-V hypercall " Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 26/37] KVM: selftests: Hyper-V PV IPI selftest Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 27/37] KVM: selftests: Fill in vm->vpages_mapped bitmap in virt_map() too Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 28/37] KVM: selftests: Export vm_vaddr_unused_gap() to make it possible to request unmapped ranges Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 29/37] KVM: selftests: Export _vm_get_page_table_entry() and struct pageTableEntry/pageUpperEntry definitions Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 30/37] KVM: selftests: Hyper-V PV TLB flush selftest Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 31/37] KVM: selftests: Sync 'struct hv_enlightened_vmcs' definition with hyperv-tlfs.h Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 32/37] KVM: selftests: nVMX: Allocate Hyper-V partition assist page Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 33/37] KVM: selftests: nSVM: Allocate Hyper-V partition assist and VP assist pages Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 34/37] KVM: selftests: Sync 'struct hv_vp_assist_page' definition with hyperv-tlfs.h Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 35/37] KVM: selftests: evmcs_test: Introduce L2 TLB flush test Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 36/37] KVM: selftests: Move Hyper-V VP assist page enablement out of evmcs.h Vitaly Kuznetsov
2022-05-25  9:01 ` [PATCH v4 37/37] KVM: selftests: hyperv_svm_test: Introduce L2 TLB flush test Vitaly Kuznetsov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20220525090133.1264239-19-vkuznets@redhat.com \
    --to=vkuznets@redhat.com \
    --cc=jmattson@google.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-hyperv@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mikelley@microsoft.com \
    --cc=mlevitsk@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=seanjc@google.com \
    --cc=sidcha@amazon.de \
    --cc=wanpengli@tencent.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.