From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: "Jan Dakinevich" <jan.dakinevich@virtuozzo.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Denis Lunev" <den@virtuozzo.com>,
"Roman Kagan" <rkagan@virtuozzo.com>,
"Denis Plotnikov" <dplotnikov@virtuozzo.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>,
"Wanpeng Li" <wanpengli@tencent.com>,
"Jim Mattson" <jmattson@google.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"x86@kernel.org" <x86@kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [PATCH 0/3] fix emulation error on Windows bootup
Date: Fri, 13 Sep 2019 11:51:37 +0200 [thread overview]
Message-ID: <4a4c71d8-c29a-d04c-e7d3-4ea9ec916a29@redhat.com> (raw)
In-Reply-To: <20190911195359.GK1045@linux.intel.com>
On 11/09/19 21:53, Sean Christopherson wrote:
> On Wed, Sep 11, 2019 at 05:51:05PM +0200, Paolo Bonzini wrote:
>> On 27/08/19 15:07, Jan Dakinevich wrote:
>>> This series intended to fix (again) a bug that was a subject of the
>>> following change:
>>>
>>> 6ea6e84 ("KVM: x86: inject exceptions produced by x86_decode_insn")
>>>
>>> Suddenly, that fix had a couple mistakes. First, ctxt->have_exception was
>>> not set if fault happened during instruction decoding. Second, returning
>>> value of inject_emulated_instruction was used to make the decision to
>>> reenter guest, but this could happen iff on nested page fault, that is not
>>> the scope where this bug could occur.
>>>
>>> However, I have still deep doubts about 3rd commit in the series. Could
>>> you please, make me an advise if it is the correct handling of guest page
>>> fault?
>>>
>>> Jan Dakinevich (3):
>>> KVM: x86: fix wrong return code
>>> KVM: x86: set ctxt->have_exception in x86_decode_insn()
>>> KVM: x86: always stop emulation on page fault
>>>
>>> arch/x86/kvm/emulate.c | 4 +++-
>>> arch/x86/kvm/x86.c | 4 +++-
>>> 2 files changed, 6 insertions(+), 2 deletions(-)
>>>
>>
>> Queued, thanks. I added the WARN_ON_ONCE that Sean suggested.
>
> Which version did you queue? It sounds like you queued v1, which breaks
> VMware backdoor emulation due to incorrect patch ordering. v3[*] fixes
> the ordering issue and adds the WARN_ON_ONCE.
I applied v1 with all the fixes, then found out v3 existed and replaced
with it (but still added a comment).
Paolo
prev parent reply other threads:[~2019-09-13 9:51 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-27 13:07 [PATCH 0/3] fix emulation error on Windows bootup Jan Dakinevich
2019-08-27 13:07 ` [PATCH 1/3] KVM: x86: fix wrong return code Jan Dakinevich
2019-08-27 13:42 ` Sean Christopherson
2019-08-27 13:07 ` [PATCH 2/3] KVM: x86: set ctxt->have_exception in x86_decode_insn() Jan Dakinevich
2019-08-27 14:53 ` Sean Christopherson
2019-08-28 10:19 ` Jan Dakinevich
2019-08-27 13:07 ` [PATCH 3/3] KVM: x86: always stop emulation on page fault Jan Dakinevich
2019-08-27 14:50 ` Sean Christopherson
2019-08-27 14:55 ` Sean Christopherson
2019-08-28 10:19 ` Jan Dakinevich
2019-08-28 14:23 ` Sean Christopherson
2019-09-11 15:51 ` [PATCH 0/3] fix emulation error on Windows bootup Paolo Bonzini
2019-09-11 19:53 ` Sean Christopherson
2019-09-13 9:51 ` Paolo Bonzini [this message]
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