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.
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