From: Gleb Natapov <gleb@redhat.com>
To: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Avi Kivity <avi@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH 1/2] KVM: X86: remove read buffer for mmio read
Date: Mon, 9 Jul 2012 16:26:42 +0300 [thread overview]
Message-ID: <20120709132642.GB7298@redhat.com> (raw)
In-Reply-To: <4FFADB37.4090705@linux.vnet.ibm.com>
On Mon, Jul 09, 2012 at 09:23:03PM +0800, Xiao Guangrong wrote:
> On 07/09/2012 08:49 PM, Avi Kivity wrote:
> > On 07/09/2012 02:23 PM, Gleb Natapov wrote:
> >>
> >>> kvm-unit-tests.git has a test for xchg to mmio. Does it still work?
> >>>
> >>> I agree this code has to go, but it needs to be replaced by something.
> >>> Maybe a .valid flag in struct operand.
> >>>
> >> Valid will not enough for that.
> >
> > If we make everything go through operands, any reason why not?
> >
>
> I noticed some instructions need to read ESP for many times (e.g, iret_real),
> maybe .valid flag is not enough for this case if the stack is in MMIO, yes?
>
> IIUC, I also noticed ESP is not reset back if it is emulated fail (mmio is needed).
> If the stack located in mmio region, this kind of instruct will be broken, i know no
> guest will use mmio as stack but SDM does not limit it, is it valid?
>
Good point about MMIO stack too.
--
Gleb.
next prev parent reply other threads:[~2012-07-09 13:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 9:02 [PATCH 1/2] KVM: X86: remove read buffer for mmio read Xiao Guangrong
2012-07-09 9:03 ` [PATCH 2/2] KVM: X86: introduce set_mmio_exit_info Xiao Guangrong
2012-07-09 11:15 ` [PATCH 1/2] KVM: X86: remove read buffer for mmio read Avi Kivity
2012-07-09 11:23 ` Gleb Natapov
2012-07-09 12:48 ` Avi Kivity
2012-07-09 12:49 ` Avi Kivity
2012-07-09 13:23 ` Xiao Guangrong
2012-07-09 13:26 ` Gleb Natapov [this message]
2012-07-09 13:34 ` Avi Kivity
2012-07-10 10:36 ` Gleb Natapov
2012-07-10 10:45 ` Avi Kivity
2012-07-10 10:48 ` Gleb Natapov
2012-07-10 12:50 ` Avi Kivity
2012-07-10 13:01 ` Gleb Natapov
2012-07-10 16:04 ` Avi Kivity
2012-07-09 13:26 ` Gleb Natapov
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