From: Maxim Levitsky <mlevitsk@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Vineeth Pillai <viremana@linux.microsoft.com>,
Lan Tianyu <Tianyu.Lan@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Tom Lendacky <thomas.lendacky@amd.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: "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: Re: [PATCH v5 0/7] Hyper-V nested virt enlightenments for SVM
Date: Fri, 11 Jun 2021 12:26:16 +0300 [thread overview]
Message-ID: <683fa50765b29f203cb4b0953542dc43226a7a2f.camel@redhat.com> (raw)
In-Reply-To: <5af1ccce-a07d-5a13-107b-fc4c4553dd4d@redhat.com>
On Thu, 2021-06-10 at 17:17 +0200, Paolo Bonzini wrote:
> On 03/06/21 17:14, Vineeth Pillai wrote:
> > This patch series enables the nested virtualization enlightenments for
> > SVM. This is very similar to the enlightenments for VMX except for the
> > fact that there is no enlightened VMCS. For SVM, VMCB is already an
> > architectural in-memory data structure.
> >
> > Note: v5 is just a rebase on hyperv-next(5.13-rc1) and needed a rework
> > based on the patch series: (KVM: VMX: Clean up Hyper-V PV TLB flush)
> > https://lore.kernel.org/lkml/20210305183123.3978098-1-seanjc@google.com/
> >
> > The supported enlightenments are:
> >
> > Enlightened TLB Flush: If this is enabled, ASID invalidations invalidate
> > only gva -> hpa entries. To flush entries derived from NPT, hyper-v
> > provided hypercalls (HvFlushGuestPhysicalAddressSpace or
> > HvFlushGuestPhysicalAddressList) should be used.
> >
> > Enlightened MSR bitmap(TLFS 16.5.3): "When enabled, L0 hypervisor does
> > not monitor the MSR bitmaps for changes. Instead, the L1 hypervisor must
> > invalidate the corresponding clean field after making changes to one of
> > the MSR bitmaps."
> >
> > Direct Virtual Flush(TLFS 16.8): 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."
> >
> > L2 Windows boot time was measured with and without the patch. Time was
> > measured from power on to the login screen and was averaged over a
> > consecutive 5 trials:
> > Without the patch: 42 seconds
> > With the patch: 29 seconds
> > --
> >
> > Changes from v4
> > - Rebased on top of 5.13-rc1 and reworked based on the changes in the
> > patch series: (KVM: VMX: Clean up Hyper-V PV TLB flush)
> >
> > Changes from v3
> > - Included definitions for software/hypervisor reserved fields in SVM
> > architectural data structures.
> > - Consolidated Hyper-V specific code into svm_onhyperv.[ch] to reduce
> > the "ifdefs". This change applies only to SVM, VMX is not touched and
> > is not in the scope of this patch series.
> >
> > Changes from v2:
> > - Refactored the Remote TLB Flush logic into separate hyperv specific
> > source files (kvm_onhyperv.[ch]).
> > - Reverted the VMCB Clean bits macro changes as it is no longer needed.
> >
> > Changes from v1:
> > - Move the remote TLB flush related fields from kvm_vcpu_hv and kvm_hv
> > to kvm_vcpu_arch and kvm_arch.
> > - Modify the VMCB clean mask runtime based on whether L1 hypervisor
> > is running on Hyper-V or not.
> > - Detect Hyper-V nested enlightenments based on
> > HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS.
> > - Address other minor review comments.
> > ---
> >
> > Vineeth Pillai (7):
> > hyperv: Detect Nested virtualization support for SVM
> > hyperv: SVM enlightened TLB flush support flag
> > KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx
> > KVM: SVM: Software reserved fields
> > KVM: SVM: hyper-v: Remote TLB flush for SVM
> > KVM: SVM: hyper-v: Enlightened MSR-Bitmap support
> > KVM: SVM: hyper-v: Direct Virtual Flush support
> >
> > arch/x86/include/asm/hyperv-tlfs.h | 9 ++
> > arch/x86/include/asm/kvm_host.h | 9 ++
> > arch/x86/include/asm/svm.h | 9 +-
> > arch/x86/include/uapi/asm/svm.h | 3 +
> > arch/x86/kernel/cpu/mshyperv.c | 10 ++-
> > arch/x86/kvm/Makefile | 9 ++
> > arch/x86/kvm/kvm_onhyperv.c | 93 +++++++++++++++++++++
> > arch/x86/kvm/kvm_onhyperv.h | 32 +++++++
> > arch/x86/kvm/svm/svm.c | 14 ++++
> > arch/x86/kvm/svm/svm.h | 22 ++++-
> > arch/x86/kvm/svm/svm_onhyperv.c | 41 +++++++++
> > arch/x86/kvm/svm/svm_onhyperv.h | 129 +++++++++++++++++++++++++++++
> > arch/x86/kvm/vmx/vmx.c | 105 +----------------------
> > arch/x86/kvm/vmx/vmx.h | 9 --
> > arch/x86/kvm/x86.c | 9 ++
> > 15 files changed, 384 insertions(+), 119 deletions(-)
> > create mode 100644 arch/x86/kvm/kvm_onhyperv.c
> > create mode 100644 arch/x86/kvm/kvm_onhyperv.h
> > create mode 100644 arch/x86/kvm/svm/svm_onhyperv.c
> > create mode 100644 arch/x86/kvm/svm/svm_onhyperv.h
> >
>
> Queued, thanks.
>
> Paolo
>
Hi!
This patch series causes a build failure here:
arch/x86/kvm/vmx/vmx.c: In function ‘hardware_setup’:
arch/x86/kvm/vmx/vmx.c:7752:34: error: ‘hv_remote_flush_tlb’ undeclared (first use in this function)
7752 | vmx_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
| ^~~~~~~~~~~~~~~~~~~
arch/x86/kvm/vmx/vmx.c:7752:34: note: each undeclared identifier is reported only once for each function it appears in
arch/x86/kvm/vmx/vmx.c:7754:5: error: ‘hv_remote_flush_tlb_with_range’ undeclared (first use in this function)
7754 | hv_remote_flush_tlb_with_range;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Also this:
arch/x86/kvm/vmx/vmx.c: In function ‘hardware_setup’:
arch/x86/kvm/vmx/vmx.c:7752:34: error: ‘hv_remote_flush_tlb’ undeclared (first use in this function)
7752 | vmx_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
| ^~~~~~~~~~~~~~~~~~~
arch/x86/kvm/vmx/vmx.c:7752:34: note: each undeclared identifier is reported only once for each function it appears in
arch/x86/kvm/vmx/vmx.c:7754:5: error: ‘hv_remote_flush_tlb_with_range’ undeclared (first use in this function)
7754 | hv_remote_flush_tlb_with_range;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Best regards,
Maxim Levitsky
next prev parent reply other threads:[~2021-06-11 9:26 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-03 15:14 [PATCH v5 0/7] Hyper-V nested virt enlightenments for SVM Vineeth Pillai
2021-06-03 15:14 ` [PATCH v5 1/7] hyperv: Detect Nested virtualization support " Vineeth Pillai
2021-06-08 16:59 ` Michael Kelley
2021-06-03 15:14 ` [PATCH v5 2/7] hyperv: SVM enlightened TLB flush support flag Vineeth Pillai
2021-06-08 17:04 ` Michael Kelley
2021-06-03 15:14 ` [PATCH v5 3/7] KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx Vineeth Pillai
2021-06-10 11:20 ` Vitaly Kuznetsov
2021-06-10 15:11 ` Paolo Bonzini
2021-06-11 7:20 ` Vitaly Kuznetsov
2021-06-03 15:14 ` [PATCH v5 4/7] KVM: SVM: Software reserved fields Vineeth Pillai
2021-06-03 15:14 ` [PATCH v5 5/7] KVM: SVM: hyper-v: Remote TLB flush for SVM Vineeth Pillai
2021-06-08 17:33 ` Michael Kelley
2021-06-03 15:14 ` [PATCH v5 6/7] KVM: SVM: hyper-v: Enlightened MSR-Bitmap support Vineeth Pillai
2021-06-03 15:14 ` [PATCH v5 7/7] KVM: SVM: hyper-v: Direct Virtual Flush support Vineeth Pillai
2021-06-10 11:16 ` Vitaly Kuznetsov
2021-06-10 15:16 ` Paolo Bonzini
2021-06-14 11:34 ` Vitaly Kuznetsov
2021-06-15 14:24 ` Vineeth Pillai
2021-06-10 15:17 ` [PATCH v5 0/7] Hyper-V nested virt enlightenments for SVM Paolo Bonzini
2021-06-11 9:26 ` Maxim Levitsky [this message]
2021-06-11 9:44 ` Vitaly Kuznetsov
2021-06-11 16:50 ` Paolo Bonzini
2021-06-14 7:47 ` Vitaly Kuznetsov
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