x86/mtrr: Use new cache_map in mtrr_type_lookup()

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Instead of crawling through the MTRR register state, use the new
cache_map for looking up the cache type(s) of a memory region.

This allows now to set the uniform parameter according to the
uniformity of the cache mode of the region, instead of setting it
only if the complete region is mapped by a single MTRR. This now
includes even the region covered by the fixed MTRR registers.

Make sure uniform is always set.

  [ bp: Massage. ]

  [ jgross: Explain mtrr_type_lookup() logic. ]

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20230502120931.20719-14-jgross@suse.com
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>

...

This commit is contained in:

Juergen Gross 2023-05-02 14:09:28 +02:00 • committed by Borislav Petkov (AMD)

parent a431660353

commit 8227f40ade

1 changed files with 43 additions and 194 deletions

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arch/x86/kernel/cpu/mtrr/generic.c

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