From: Sean Christopherson <seanjc@google.com>
To: Alexander Graf <graf@amazon.com>
Cc: "Alex Williamson" <alex.williamson@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
kvm@vger.kernel.org, "Xiao Guangrong" <guangrong.xiao@gmail.com>,
"Chandrasekaran, Siddharth" <sidcha@amazon.de>,
"Paolo Bonzini" <pbonzini@redhat.com>
Subject: Re: [PATCH v2 11/27] KVM: x86/mmu: Zap only the relevant pages when removing a memslot
Date: Thu, 20 Oct 2022 20:37:48 +0000 [thread overview]
Message-ID: <Y1GxnGo3A8UF3iTt@google.com> (raw)
In-Reply-To: <590c9312-a21f-8569-9da3-34508300afcc@amazon.com>
On Thu, Oct 20, 2022, Alexander Graf wrote:
> On 26.06.20 19:32, Sean Christopherson wrote:
> > /cast <thread necromancy>
> >
> > On Tue, Aug 20, 2019 at 01:03:19PM -0700, Sean Christopherson wrote:
>
> [...]
>
> > I don't think any of this explains the pass-through GPU issue. But, we
> > have a few use cases where zapping the entire MMU is undesirable, so I'm
> > going to retry upstreaming this patch as with per-VM opt-in. I wanted to
> > set the record straight for posterity before doing so.
>
> Hey Sean,
>
> Did you ever get around to upstream or rework the zap optimization? The way
> I read current upstream, a memslot change still always wipes all SPTEs, not
> only the ones that were changed.
Nope, I've more or less given up hope on zapping only the deleted/moved memslot.
TDX (and SNP?) will preserve SPTEs for guest private memory, but they're very
much a special case.
Do you have use case and/or issue that doesn't play nice with the "zap all" behavior?
next prev parent reply other threads:[~2022-10-20 20:37 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-05 20:54 [PATCH v2 00/27] KVM: x86/mmu: Remove fast invalidate mechanism Sean Christopherson
2019-02-05 20:54 ` [PATCH v2 01/27] KVM: Call kvm_arch_memslots_updated() before updating memslots Sean Christopherson
2019-02-06 9:12 ` Cornelia Huck
2019-02-12 12:36 ` [PATCH v2 00/27] KVM: x86/mmu: Remove fast invalidate mechanism Paolo Bonzini
[not found] ` <20190205210137.1377-11-sean.j.christopherson@intel.com>
2019-08-13 16:04 ` [PATCH v2 11/27] KVM: x86/mmu: Zap only the relevant pages when removing a memslot Alex Williamson
2019-08-13 17:04 ` Sean Christopherson
2019-08-13 17:57 ` Alex Williamson
2019-08-13 19:33 ` Alex Williamson
2019-08-13 20:19 ` Sean Christopherson
2019-08-13 20:37 ` Paolo Bonzini
2019-08-13 21:14 ` Alex Williamson
2019-08-13 21:15 ` Paolo Bonzini
2019-08-13 22:10 ` Alex Williamson
2019-08-15 14:46 ` Sean Christopherson
2019-08-15 15:23 ` Alex Williamson
2019-08-15 16:00 ` Sean Christopherson
2019-08-15 18:16 ` Alex Williamson
2019-08-15 19:25 ` Sean Christopherson
2019-08-15 20:11 ` Alex Williamson
2019-08-19 16:03 ` Paolo Bonzini
2019-08-20 20:03 ` Sean Christopherson
2019-08-20 20:42 ` Alex Williamson
2019-08-20 21:02 ` Sean Christopherson
2019-08-21 19:08 ` Alex Williamson
2019-08-21 19:35 ` Alex Williamson
2019-08-21 20:30 ` Sean Christopherson
2019-08-23 2:25 ` Sean Christopherson
2019-08-23 22:05 ` Alex Williamson
2019-08-21 20:10 ` Sean Christopherson
2019-08-26 7:36 ` Tian, Kevin
2019-08-26 14:56 ` Sean Christopherson
2020-06-26 17:32 ` Sean Christopherson
2022-10-20 18:31 ` Alexander Graf
2022-10-20 20:37 ` Sean Christopherson [this message]
2022-10-20 21:06 ` Alexander Graf
2022-10-21 19:40 ` Sean Christopherson
2022-10-24 6:12 ` Alexander Graf
2022-10-24 15:55 ` Sean Christopherson
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