Juergen Gross 90b926e68f x86/pat: Fix pat_x_mtrr_type() for MTRR disabled case ... Since 72cbc8f04f ("x86/PAT: Have pat_enabled() properly reflect state when running on Xen") PAT can be enabled without MTRR. This has resulted in problems e.g. for a SEV-SNP guest running under Hyper-V, when trying to establish a new mapping via memremap() with WB caching mode, as pat_x_mtrr_type() will call mtrr_type_lookup(), which in turn is returning MTRR_TYPE_INVALID due to MTRR being disabled in this configuration. The result is a mapping with UC- caching, leading to severe performance degradation. Fix that by handling MTRR_TYPE_INVALID the same way as MTRR_TYPE_WRBACK in pat_x_mtrr_type() because MTRR_TYPE_INVALID means MTRRs are disabled. [ bp: Massage commit message. ] Fixes: 72cbc8f04f ("x86/PAT: Have pat_enabled() properly reflect state when running on Xen") Reported-by: Michael Kelley (LINUX) <mikelley@microsoft.com> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Tested-by: Michael Kelley <mikelley@microsoft.com> Cc: <stable@kernel.org> Link: https://lore.kernel.org/r/20230110065427.20767-1-jgross@suse.com		2023-01-10 17:21:53 +01:00
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alpha
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arm	ARM: renumber bits related to _TIF_WORK_MASK	2023-01-04 07:55:02 -07:00
arm64	crypto: arm64/sm4 - fix possible crash with CFI enabled	2022-12-30 17:57:42 +08:00
csky
hexagon
ia64
loongarch
m68k	m68k: remove broken strcmp implementation	2022-12-21 08:56:43 -08:00
microblaze
mips	of/fdt: run soc memory setup when early_init_dt_scan_memory fails	2023-01-03 18:41:01 -06:00
nios2
openrisc
parisc
powerpc	powerpc fixes for 6.2 #2	2023-01-08 06:55:08 -07:00
riscv	riscv: uaccess: fix type of 0 variable on error in get_user()	2023-01-05 12:30:41 -08:00
s390
sh	treewide: Convert del_timer*() to timer_shutdown*()	2022-12-25 13:38:09 -08:00
sparc
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x86	x86/pat: Fix pat_x_mtrr_type() for MTRR disabled case	2023-01-10 17:21:53 +01:00
xtensa
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