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From: Sean Christopherson <seanjc@google.com>
To: Jim Mattson <jmattson@google.com>
Cc: Robert Hoo <robert.hu@linux.intel.com>,
	pbonzini@redhat.com, vkuznets@redhat.com, wanpengli@tencent.com,
	joro@8bytes.org, kvm@vger.kernel.org, yu.c.zhang@linux.intel.com
Subject: Re: [PATCH v1 3/5] KVM: x86: nVMX: VMCS12 field's read/write respects field existence bitmap
Date: Wed, 18 Aug 2021 23:49:24 +0000	[thread overview]
Message-ID: <YR2chNdSyyAtjCU3@google.com> (raw)
In-Reply-To: <CALMp9eQnq9RDQiRmfOge52Yx8SCM5D2nAM-0bcqaGJQJXvgfDA@mail.gmail.com>

On Wed, Aug 18, 2021, Jim Mattson wrote:
> On Wed, Aug 18, 2021 at 4:11 PM Sean Christopherson <seanjc@google.com> wrote:
> > This is quite the complicated mess for something I'm guessing no one actually
> > cares about.  At what point do we chalk this up as a virtualization hole and
> > sweep it under the rug?
> 
> Good point! Note that hardware doesn't even get this right. See
> erratum CF77 in
> https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-e7-v2-spec-update.pdf.
> I'd cut and paste the text here, but Intel won't allow that.

Ha!  KVM's behavior is a feature, not a bug, we're just matching hardware! ;-)

  reply	other threads:[~2021-08-18 23:49 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-17  9:31 [PATCH v1 0/5] KVM/x86/nVMX: Add field existence support in VMCS12 Robert Hoo
2021-08-17  9:31 ` [PATCH v1 1/5] KVM: x86: nVMX: Add vmcs12 field existence bitmap in nested_vmx Robert Hoo
2021-10-20 15:10   ` Paolo Bonzini
2021-10-21 12:41     ` Robert Hoo
2021-08-17  9:31 ` [PATCH v1 2/5] KVM: x86: nVMX: Update VMCS12 fields existence when nVMX MSRs are set Robert Hoo
2021-10-20 15:11   ` Paolo Bonzini
2021-10-21 13:08     ` Robert Hoo
2021-08-17  9:31 ` [PATCH v1 3/5] KVM: x86: nVMX: VMCS12 field's read/write respects field existence bitmap Robert Hoo
2021-08-17 15:54   ` Sean Christopherson
2021-08-18  5:50     ` Robert Hoo
2021-08-18 23:10       ` Sean Christopherson
2021-08-18 23:45         ` Jim Mattson
2021-08-18 23:49           ` Sean Christopherson [this message]
2021-08-19  9:58         ` Robert Hoo
2021-09-01 20:42           ` Sean Christopherson
2021-09-03  8:51             ` Robert Hoo
2021-09-03 15:11               ` Sean Christopherson
2021-09-28 10:05                 ` Robert Hoo
2021-10-05 16:15                   ` Sean Christopherson
2021-10-05 17:32                     ` Jim Mattson
2021-10-05 17:59                       ` Sean Christopherson
2021-10-05 20:42                         ` Jim Mattson
2021-10-05 20:50                           ` Sean Christopherson
2021-10-05 22:40                             ` Jim Mattson
2021-10-05 23:22                               ` Sean Christopherson
2021-10-08  8:23                                 ` Yu Zhang
2021-10-08 15:09                                   ` Robert Hoo
2021-10-08 23:49                                     ` Jim Mattson
2021-10-09  0:05                                       ` Robert Hoo
2021-10-29 19:53                                         ` Jim Mattson
2021-11-03  1:31                                           ` Robert Hoo
2021-11-09 22:33                                             ` Sean Christopherson
2021-11-10  5:35                                               ` Yu Zhang
2021-11-18  1:19                                                 ` Sean Christopherson
2021-11-19  7:32                                                   ` Robert Hoo
2021-08-17  9:31 ` [PATCH v1 4/5] KVM: x86: nVMX: Respect vmcs12 field existence when calc vmx_vmcs_enum_msr Robert Hoo
2021-08-17  9:31 ` [PATCH v1 5/5] KVM: x86: nVMX: Ignore user space set value to MSR_IA32_VMX_VMCS_ENUM Robert Hoo

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