From: Avi Kivity <avi@redhat.com>
To: "Kevin O'Connor" <kevin@koconnor.net>
Cc: seabios@seabios.org, kvm@vger.kernel.org
Subject: Re: [SeaBIOS] [PATCH] Make MTRR region 0xc0000-0x100000 be cached.
Date: Sun, 03 Jan 2010 08:15:31 +0200 [thread overview]
Message-ID: <4B403603.80504@redhat.com> (raw)
In-Reply-To: <20100101182308.GB10271@morn.localdomain>
On 01/01/2010 08:23 PM, Kevin O'Connor wrote:
> The current MTRR code in SeaBIOS uses uncached ram for
> 0xc0000-0x100000. This seems overly pessimistic as "write protect"
> should be sufficient. (Note, a WP mtrr does not prevent writes - it
> is a caching strategy for memory that can be read-only.)
>
> I'm not sure how much KVM really uses the MTRRs, but if it does honor
> them this should make bootup a bit faster as it will allow caching of
> the SeaBIOS code.
>
> This change also clears all the variable mtrrs, and makes sure all the
> mtrrs are set before they are enabled.
>
>
kvm ignores the MTRRs, unless device assignment is enabled, in which
case it honours them.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
prev parent reply other threads:[~2010-01-03 6:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-01 18:23 [SeaBIOS] [PATCH] Make MTRR region 0xc0000-0x100000 be cached Kevin O'Connor
2010-01-03 6:15 ` Avi Kivity [this message]
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