From: Avi Kivity <avi@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.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 13:04:05 +0200 [thread overview]
Message-ID: <4B83B625.2080207@redhat.com> (raw)
In-Reply-To: <20100223110054.GI29041@redhat.com>
On 02/23/2010 01:00 PM, Gleb Natapov wrote:
>>>
>>> They will not trigger before that. They will be queued for the next
>>> entry and queuing another one will either overwrite the previous one,
>>> or will queue double fault (depending on what what the first exception).
>>>
>> The will not stack as the instruction failed, thus no singlestep will be
>> queued as well.
>>
> Instruction failed doesn't mean emulation failed, so lets see what
> happens when you single step over instruction that generates page fault.
> #PF is queued and x86_emulate_insn() returns 0 to emulate_instruction()
> no you call queue_singlestep() which calls kvm_queue_exception(vcpu, DB_VECTOR);
> and this cause #DF to be injected.
>
This looks like a test case btw.
We need to test, at least:
- unemulated single step
- emulated single step successful insn
- emulated single step faulting insn
and probably more.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-02-23 11:04 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 [this message]
2010-02-23 11:30 ` Jan Kiszka
2010-02-23 11:41 ` Avi Kivity
2010-02-23 12:03 ` Jan Kiszka
2010-02-23 12:05 ` Gleb Natapov
2010-02-23 12:02 ` Gleb Natapov
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