From: Jan Dakinevich <jan.dakinevich@virtuozzo.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "Jan Dakinevich" <jan.dakinevich@virtuozzo.com>,
"Denis Lunev" <den@virtuozzo.com>,
"Roman Kagan" <rkagan@virtuozzo.com>,
"Denis Plotnikov" <dplotnikov@virtuozzo.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Sean Christopherson" <sean.j.christopherson@intel.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: [PATCH v3 0/2] fix emulation error on Windows bootup
Date: Thu, 29 Aug 2019 08:23:16 +0000 [thread overview]
Message-ID: <1567066988-23376-1-git-send-email-jan.dakinevich@virtuozzo.com> (raw)
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.
v1:
https://lkml.org/lkml/2019/8/27/881
v2:
https://lkml.org/lkml/2019/8/28/879
v3:
- do sanity check in caller code
- drop patch, that moved emulation_type() function
Jan Dakinevich (2):
KVM: x86: always stop emulation on page fault
KVM: x86: set ctxt->have_exception in x86_decode_insn()
arch/x86/kvm/emulate.c | 2 ++
arch/x86/kvm/x86.c | 7 ++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
--
2.1.4
next reply other threads:[~2019-08-29 8:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-29 8:23 Jan Dakinevich [this message]
2019-08-29 8:23 ` [PATCH v3 1/2] KVM: x86: always stop emulation on page fault Jan Dakinevich
2019-08-30 1:06 ` Sean Christopherson
2019-08-29 8:23 ` [PATCH v3 2/2] KVM: x86: set ctxt->have_exception in x86_decode_insn() Jan Dakinevich
2019-08-30 1:08 ` Sean Christopherson
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