From: Vineeth Pillai <viremana@linux.microsoft.com>
To: Lan Tianyu <Tianyu.Lan@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Wei Liu <wei.liu@kernel.org>,
Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>
Cc: Vineeth Pillai <viremana@linux.microsoft.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"K. Y. Srinivasan" <kys@microsoft.com>,
x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org
Subject: [PATCH 7/7] KVM: SVM: hyper-v: Direct Virtual Flush support
Date: Wed, 7 Apr 2021 14:41:28 +0000 [thread overview]
Message-ID: <aa634c867aa395aa2d3eae950dfec137f59a62c6.1617804573.git.viremana@linux.microsoft.com> (raw)
In-Reply-To: <cover.1617804573.git.viremana@linux.microsoft.com>
From Hyper-V TLFS:
"The hypervisor exposes hypercalls (HvFlushVirtualAddressSpace,
HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressList, and
HvFlushVirtualAddressListEx) that allow operating systems to more
efficiently manage the virtual TLB. The L1 hypervisor can choose to
allow its guest to use those hypercalls and delegate the responsibility
to handle them to the L0 hypervisor. This requires the use of a
partition assist page."
Add the Direct Virtual Flush support for SVM.
Related VMX changes:
commit 6f6a657c9998 ("KVM/Hyper-V/VMX: Add direct tlb flush support")
Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
---
arch/x86/kvm/svm/svm.c | 48 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 3562a247b7e8..c6d3f3a7c986 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -440,6 +440,32 @@ static void svm_init_osvw(struct kvm_vcpu *vcpu)
vcpu->arch.osvw.status |= 1;
}
+#if IS_ENABLED(CONFIG_HYPERV)
+static int hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu)
+{
+ struct hv_enlightenments *hve;
+ struct hv_partition_assist_pg **p_hv_pa_pg =
+ &to_kvm_hv(vcpu->kvm)->hv_pa_pg;
+
+ if (!*p_hv_pa_pg)
+ *p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL);
+
+ if (!*p_hv_pa_pg)
+ return -ENOMEM;
+
+ hve = (struct hv_enlightenments *)&to_svm(vcpu)->vmcb->hv_enlightenments;
+
+ hve->partition_assist_page = __pa(*p_hv_pa_pg);
+ hve->hv_vm_id = (unsigned long)vcpu->kvm;
+ if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
+ hve->hv_enlightenments_control.nested_flush_hypercall = 1;
+ vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
+ }
+
+ return 0;
+}
+#endif
+
static int has_svm(void)
{
const char *msg;
@@ -1034,6 +1060,21 @@ static __init int svm_hardware_setup(void)
svm_x86_ops.tlb_remote_flush_with_range =
kvm_hv_remote_flush_tlb_with_range;
}
+
+ if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
+ pr_info("kvm: Hyper-V Direct TLB Flush enabled\n");
+ for_each_online_cpu(cpu) {
+ struct hv_vp_assist_page *vp_ap =
+ hv_get_vp_assist_page(cpu);
+
+ if (!vp_ap)
+ continue;
+
+ vp_ap->nested_control.features.directhypercall = 1;
+ }
+ svm_x86_ops.enable_direct_tlbflush =
+ hv_enable_direct_tlbflush;
+ }
#endif
if (nrips) {
@@ -3913,6 +3954,13 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
}
svm->vmcb->save.cr2 = vcpu->arch.cr2;
+#if IS_ENABLED(CONFIG_HYPERV)
+ if (svm->vmcb->hv_enlightenments.hv_vp_id != to_hv_vcpu(vcpu)->vp_index) {
+ svm->vmcb->hv_enlightenments.hv_vp_id = to_hv_vcpu(vcpu)->vp_index;
+ vmcb_mark_dirty(svm->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
+ }
+#endif
+
/*
* Run with all-zero DR6 unless needed, so that we can get the exact cause
* of a #DB.
--
2.25.1
next prev parent reply other threads:[~2021-04-07 14:41 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 14:41 [PATCH 0/7] Hyper-V nested virt enlightenments for SVM Vineeth Pillai
2021-04-07 14:41 ` [PATCH 1/7] hyperv: Detect Nested virtualization support " Vineeth Pillai
2021-04-07 16:09 ` Borislav Petkov
2021-04-07 19:55 ` Michael Kelley
2021-04-07 22:48 ` Sean Christopherson
2021-04-08 13:26 ` Vineeth Pillai
2021-04-08 11:06 ` Vitaly Kuznetsov
2021-04-08 13:15 ` Vineeth Pillai
2021-04-08 15:24 ` Sean Christopherson
2021-04-09 12:23 ` Vineeth Pillai
2021-04-07 14:41 ` [PATCH 2/7] hyperv: SVM enlightened TLB flush support flag Vineeth Pillai
2021-04-07 19:56 ` Michael Kelley
2021-04-08 13:45 ` Vineeth Pillai
2021-04-07 14:41 ` [PATCH 3/7] KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx Vineeth Pillai
2021-04-08 11:14 ` Vitaly Kuznetsov
2021-04-08 13:18 ` Vineeth Pillai
2021-04-07 14:41 ` [PATCH 4/7] KVM: SVM: hyper-v: Nested enlightenments in VMCB Vineeth Pillai
2021-04-08 15:44 ` Paolo Bonzini
2021-04-09 12:24 ` Vineeth Pillai
2021-04-07 14:41 ` [PATCH 5/7] KVM: SVM: hyper-v: Remote TLB flush for SVM Vineeth Pillai
2021-04-08 11:18 ` Vitaly Kuznetsov
2021-04-08 13:19 ` Vineeth Pillai
2021-04-07 14:41 ` [PATCH 6/7] KVM: SVM: hyper-v: Enlightened MSR-Bitmap support Vineeth Pillai
2021-04-08 11:22 ` Vitaly Kuznetsov
2021-04-08 15:47 ` Paolo Bonzini
2021-04-07 14:41 ` Vineeth Pillai [this message]
2021-04-08 11:25 ` [PATCH 7/7] KVM: SVM: hyper-v: Direct Virtual Flush support 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=aa634c867aa395aa2d3eae950dfec137f59a62c6.1617804573.git.viremana@linux.microsoft.com \
--to=viremana@linux.microsoft.com \
--cc=Tianyu.Lan@microsoft.com \
--cc=bp@alien8.de \
--cc=haiyangz@microsoft.com \
--cc=hpa@zytor.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
--cc=kys@microsoft.com \
--cc=linux-hyperv@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mikelley@microsoft.com \
--cc=mingo@redhat.com \
--cc=pbonzini@redhat.com \
--cc=seanjc@google.com \
--cc=sthemmin@microsoft.com \
--cc=tglx@linutronix.de \
--cc=vkuznets@redhat.com \
--cc=wanpengli@tencent.com \
--cc=wei.liu@kernel.org \
--cc=x86@kernel.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).