From: Sean Christopherson <seanjc@google.com>
To: Mingwei Zhang <mizhang@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Yosry Ahmed <yosryahmed@google.com>,
Ben Gardon <bgardon@google.com>
Subject: Re: [PATCH v2 0/6] KVM: x86: Apply NX mitigation more precisely
Date: Tue, 26 Jul 2022 17:21:57 +0000 [thread overview]
Message-ID: <YuAitajfWA40qQI8@google.com> (raw)
In-Reply-To: <YuAZDbg9Dzw0LKkp@google.com>
On Tue, Jul 26, 2022, Sean Christopherson wrote:
> On Tue, Jul 26, 2022, Mingwei Zhang wrote:
> > On Sat, Jul 23, 2022, Sean Christopherson wrote:
> > > Patch 6 from Mingwei is the end goal of the series. KVM incorrectly
> > > assumes that the NX huge page mitigation is the only scenario where KVM
> > > will create a non-leaf page instead of a huge page. Precisely track
> > > (via kvm_mmu_page) if a non-huge page is being forced and use that info
> > > to avoid unnecessarily forcing smaller page sizes in
> > > disallowed_hugepage_adjust().
> > >
> > > v2: Rebase, tweak a changelog accordingly.
> >
> > hmm, I applied this patch set (v2) on top of kvm/queue (HEAD:
> > 1a4d88a361af) and it seems kvm-unit-tests/vmx failed on both ept=1 and
> > ept=0. And it did not work on our internel kernel either (kernel
> > crashed).
> >
> > Maybe there is still minor issues?
>
> Heh, or not so minor issues. I'll see what I broke. I have a bad feeling that
> it's the EPT tests; IIRC I only ran VMX on a platform with MAXPHYADDR < 40.
Hrm, not seeing failures (beyond the VMX_VMCS_ENUM.MAX_INDEX failure because I'm
running an older QEMU).
I'll follow up off-list to figure out what's going on.
next prev parent reply other threads:[~2022-07-26 17:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-23 1:23 [PATCH v2 0/6] KVM: x86: Apply NX mitigation more precisely Sean Christopherson
2022-07-23 1:23 ` [PATCH v2 1/6] KVM: x86/mmu: Tag disallowed NX huge pages even if they're not tracked Sean Christopherson
2022-07-25 22:49 ` David Matlack
2022-07-25 23:26 ` Sean Christopherson
2022-07-25 23:45 ` David Matlack
2022-07-26 0:01 ` Sean Christopherson
2022-07-28 22:11 ` Paolo Bonzini
2022-07-23 1:23 ` [PATCH v2 2/6] KVM: x86/mmu: Properly account NX huge page workaround for nonpaging MMUs Sean Christopherson
2022-07-25 23:05 ` David Matlack
2022-07-25 23:08 ` David Matlack
2022-07-28 20:15 ` Paolo Bonzini
2022-07-23 1:23 ` [PATCH v2 3/6] KVM: x86/mmu: Set disallowed_nx_huge_page in TDP MMU before setting SPTE Sean Christopherson
2022-07-25 23:16 ` David Matlack
2022-07-23 1:23 ` [PATCH v2 4/6] KVM: x86/mmu: Track the number of TDP MMU pages, but not the actual pages Sean Christopherson
2022-07-25 23:21 ` David Matlack
2022-07-25 23:27 ` Sean Christopherson
2022-07-27 2:41 ` Yan Zhao
2022-07-27 19:04 ` Sean Christopherson
2022-07-29 1:02 ` Yan Zhao
2022-07-23 1:23 ` [PATCH v2 5/6] KVM: x86/mmu: Add helper to convert SPTE value to its shadow page Sean Christopherson
2022-07-25 23:23 ` David Matlack
2022-07-25 23:33 ` Sean Christopherson
2022-07-23 1:23 ` [PATCH v2 6/6] KVM: x86/mmu: explicitly check nx_hugepage in disallowed_hugepage_adjust() Sean Christopherson
2022-07-25 23:28 ` David Matlack
2022-07-26 5:37 ` [PATCH v2 0/6] KVM: x86: Apply NX mitigation more precisely Mingwei Zhang
2022-07-26 16:40 ` Sean Christopherson
2022-07-26 17:21 ` Sean Christopherson [this message]
2022-07-28 20:17 ` Paolo Bonzini
2022-07-28 21:20 ` Sean Christopherson
2022-07-28 21:41 ` Mingwei Zhang
2022-07-28 22:09 ` Paolo Bonzini
2022-07-28 22:15 ` Sean Christopherson
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