x86/hyperv: Set MTRR state when running as SEV-SNP Hyper-V guest

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[ Upstream commit c957f1f3c4 ]

In order to avoid mappings using the UC- cache attribute, set the
MTRR state to use WB caching as the default.

This is needed in order to cope with the fact that PAT is enabled,
while MTRRs are not supported by the hypervisor.

Fixes: 90b926e68f ("x86/pat: Fix pat_x_mtrr_type() for MTRR disabled case")
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/20230502120931.20719-5-jgross@suse.com
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Juergen Gross 2023-05-02 14:09:19 +02:00 • committed by Greg Kroah-Hartman

parent 81a3b5a5dc

commit e170ba7435

1 changed files with 4 additions and 0 deletions

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arch/x86/hyperv/ivm.c

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