From: Sheng Yang <sheng@linux.intel.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH 0/6] MTRR/PAT support for EPT (v3)
Date: Thu, 9 Oct 2008 17:26:17 +0800 [thread overview]
Message-ID: <200810091726.17541.sheng@linux.intel.com> (raw)
In-Reply-To: <48EDC8DC.5050006@redhat.com>
On Thursday 09 October 2008 17:03:24 Avi Kivity wrote:
> Sheng Yang wrote:
> > Hi, Avi
> >
> > Here is the latest update of MTRR/PAT support.
> >
> > Change from v2:
> > Discard the using of MSR bitmap, add MSR_IA32_CR_PAT to save/restore, as
> > well as rebase on latest upstream.
>
> Applied all; my comments about shadow can be addressed later.
>
> There is also the danger of the guest setting the wrong MTRR type for
> RAM, thus introducing incompatible memory types (between qemu and the
> guest). If this is a problem, we should ignore the guest's mtrr (and
> pat) for RAM and use write-back instead.
Do you mean host(qemu) would access this memory and if we set it to guest
MTRR, host access would be broken? We would cover this in our shadow MTRR
patch, for we encountered this in video ram when doing some experiment with
VGA assignment.
--
regards
Yang, Sheng
next prev parent reply other threads:[~2008-10-09 9:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-09 8:01 [PATCH 0/6] MTRR/PAT support for EPT (v3) Sheng Yang
2008-10-09 8:01 ` [PATCH 1/6] x86: Rename mtrr_state struct and macro names Sheng Yang
2008-10-09 8:01 ` [PATCH 2/6] x86: Export some definition of MTRR Sheng Yang
2008-10-09 8:01 ` [PATCH 3/6] KVM: Improve MTRR structure Sheng Yang
2008-10-09 8:01 ` [PATCH 4/6] KVM: VMX: Add PAT support for EPT Sheng Yang
2008-10-09 8:01 ` [PATCH 5/6] Add local get_mtrr_type() to support MTRR Sheng Yang
2008-10-09 8:01 ` [PATCH 6/6] Enable MTRR for EPT Sheng Yang
2008-10-09 8:44 ` Avi Kivity
2008-10-09 8:49 ` Sheng Yang
2008-10-09 9:03 ` [PATCH 0/6] MTRR/PAT support for EPT (v3) Avi Kivity
2008-10-09 9:26 ` Sheng Yang [this message]
2008-10-09 10:12 ` Avi Kivity
2008-10-10 2:46 ` Sheng Yang
2008-10-10 6:49 ` Avi Kivity
2008-10-10 7:16 ` Sheng Yang
2008-10-12 9:47 ` Avi Kivity
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