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linux/arch/x86/kernel/cpu/mtrr
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Jiaqing Zhao 824c6384e8 x86/mtrr: Check if fixed-range MTRRs exist in mtrr_save_fixed_ranges() 
When suspending, save_processor_state() calls mtrr_save_fixed_ranges()
to save fixed-range MTRRs.

On platforms without fixed-range MTRRs like the ACRN hypervisor which
has removed fixed-range MTRR emulation, accessing these MSRs will
trigger an unchecked MSR access error. Make sure fixed-range MTRRs are
supported before access to prevent such error.

Since mtrr_state.have_fixed is only set when MTRRs are present and
enabled, checking the CPU feature flag in mtrr_save_fixed_ranges() is
unnecessary.

Fixes: 3ebad59056 ("[PATCH] x86: Save and restore the fixed-range MTRRs of the BSP when suspending")
Signed-off-by: Jiaqing Zhao <jiaqing.zhao@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250509170633.3411169-2-jiaqing.zhao@linux.intel.com
2025-05-12 13:04:40 +02:00
..
amd.c x86/mtrr: Replace vendor tests in MTRR code 2023-06-01 15:04:32 +02:00
centaur.c x86/mtrr: Remove unused code 2023-06-01 15:04:33 +02:00
cleanup.c x86/mtrr: Unify debugging printing 2023-06-01 15:04:33 +02:00
cyrix.c x86/mtrr: Replace vendor tests in MTRR code 2023-06-01 15:04:32 +02:00
generic.c x86/mtrr: Check if fixed-range MTRRs exist in mtrr_save_fixed_ranges() 2025-05-12 13:04:40 +02:00
if.c x86/mtrr: Remove unnecessary strlen() in mtrr_write() 2025-02-25 20:50:55 +01:00
legacy.c x86/mtrr: Allocate mtrr_value array dynamically 2023-06-01 15:04:33 +02:00
Makefile x86/mtrr: Move 32-bit code from mtrr.c to legacy.c 2023-06-01 15:04:33 +02:00
mtrr.c x86/mtrr: Rename mtrr_overwrite_state() to guest_force_mtrr_state() 2024-12-04 10:46:19 -08:00
mtrr.h x86/mtrr: Unify debugging printing 2023-06-01 15:04:33 +02:00