From: Jan Kiszka <jan.kiszka@siemens.com>
To: Avi Kivity <avi@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>, kvm <kvm@vger.kernel.org>
Subject: Re: [PATCH 6/6] KVM: x86: Emulator support for TF
Date: Tue, 23 Feb 2010 13:03:42 +0100 [thread overview]
Message-ID: <4B83C41E.30207@siemens.com> (raw)
In-Reply-To: <4B83BEF8.5050503@redhat.com>
Avi Kivity wrote:
> On 02/23/2010 01:30 PM, Jan Kiszka wrote:
>>> How to detect that emulation is complete? emulate_instruction() should
>>> return EMULATE_DONE in this case.
>>>
>> ...*and* RIP moved forward.
>>
>
> A branch or rep instruction can successfully execute and not change rip.
>
> Btw, do we expect a #DB on every iteration of rep? In this case we need
> to modify the code, currently we'll batch rep;ins and rep;outs up to a
> page's worth.
Right, TF triggers after each rep step. So we need to break this up when
tracing is on. That's now definitely something we need a deeper emulator
change.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2010-02-23 12:04 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-22 17:51 [PATCH 0/6] KVM: Enhancements and fixes around guest debugging Jan Kiszka
2010-02-22 17:51 ` [PATCH 1/6] KVM: VMX: Update instruction length on intercepted BP Jan Kiszka
2010-02-22 17:51 ` [PATCH 2/6] KVM: SVM: Emulate nRIP feature when reinjecting INT3 Jan Kiszka
2010-02-23 10:13 ` Gleb Natapov
2010-02-23 10:17 ` Jan Kiszka
2010-02-23 10:23 ` Avi Kivity
2010-02-22 17:51 ` [PATCH 3/6] KVM: x86: Add KVM_CAP_X86_ROBUST_SINGLESTEP Jan Kiszka
2010-02-22 17:51 ` [PATCH 4/6] KVM: x86: Drop RF manipulation for guest single-stepping Jan Kiszka
2010-02-22 17:51 ` [PATCH 5/6] KVM: x86: Preserve injected TF across emulation Jan Kiszka
2010-02-23 10:00 ` Gleb Natapov
2010-02-23 10:13 ` Jan Kiszka
2010-02-23 10:31 ` Gleb Natapov
2010-02-23 10:40 ` Jan Kiszka
2010-02-23 11:03 ` Gleb Natapov
2010-02-22 17:51 ` [PATCH 6/6] KVM: x86: Emulator support for TF Jan Kiszka
2010-02-23 9:55 ` Gleb Natapov
2010-02-23 10:10 ` Jan Kiszka
2010-02-23 10:26 ` Gleb Natapov
2010-02-23 10:29 ` Avi Kivity
2010-02-23 10:32 ` Gleb Natapov
2010-02-23 10:34 ` Avi Kivity
2010-02-23 10:37 ` Jan Kiszka
2010-02-23 11:00 ` Gleb Natapov
2010-02-23 11:04 ` Avi Kivity
2010-02-23 11:30 ` Jan Kiszka
2010-02-23 11:41 ` Avi Kivity
2010-02-23 12:03 ` Jan Kiszka [this message]
2010-02-23 12:05 ` Gleb Natapov
2010-02-23 12:02 ` Gleb Natapov
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