From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Jan Dakinevich <jan.dakinevich@virtuozzo.com>
Cc: "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>,
"Paolo Bonzini" <pbonzini@redhat.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 1/3] KVM: x86: fix wrong return code
Date: Tue, 27 Aug 2019 06:42:02 -0700 [thread overview]
Message-ID: <20190827134202.GB27459@linux.intel.com> (raw)
In-Reply-To: <1566911210-30059-2-git-send-email-jan.dakinevich@virtuozzo.com>
On Tue, Aug 27, 2019 at 01:07:04PM +0000, Jan Dakinevich wrote:
> x86_emulate_instruction(), the caller of x86_decode_insn(), expects
> that x86_decode_insn()'s returning value belongs to EMULATION_* name
> space. However, this function may return value from X86EMUL_* name
> space.
>
> Although, the code behaves properly (because both X86EMUL_CONTINUE and
> EMULATION_OK are equal to 0) this change makes code more consistent and
> it is required for further fixes.
>
> Cc: Denis Lunev <den@virtuozzo.com>
> Cc: Roman Kagan <rkagan@virtuozzo.com>
> Cc: Denis Plotnikov <dplotnikov@virtuozzo.com>
> Signed-off-by: Jan Dakinevich <jan.dakinevich@virtuozzo.com>
> ---
> arch/x86/kvm/emulate.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
> index 718f7d9..6170ddf 100644
> --- a/arch/x86/kvm/emulate.c
> +++ b/arch/x86/kvm/emulate.c
> @@ -5144,7 +5144,7 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
> else {
> rc = __do_insn_fetch_bytes(ctxt, 1);
> if (rc != X86EMUL_CONTINUE)
> - return rc;
> + goto done;
Funny how things go unnoticed for years and then suddenly...
https://lkml.kernel.org/r/9bf79098-703c-e82b-7e7d-1c0a6a1023c2@redhat.com
> }
>
> switch (mode) {
> --
> 2.1.4
>
next prev parent reply other threads:[~2019-08-27 13:42 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 [this message]
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
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