Andi Kleen 06c1de44d3 x86/mtrr: Check if fixed MTRRs exist before saving them ... commit 919f18f961 upstream. MTRRs have an obsolete fixed variant for fine grained caching control of the 640K-1MB region that uses separate MSRs. This fixed variant has a separate capability bit in the MTRR capability MSR. So far all x86 CPUs which support MTRR have this separate bit set, so it went unnoticed that mtrr_save_state() does not check the capability bit before accessing the fixed MTRR MSRs. Though on a CPU that does not support the fixed MTRR capability this results in a #GP. The #GP itself is harmless because the RDMSR fault is handled gracefully, but results in a WARN_ON(). Add the missing capability check to prevent this. Fixes: 2b1f6278d7 ("[PATCH] x86: Save the MTRRs of the BSP before booting an AP") Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20240808000244.946864-1-ak@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-08-19 05:33:53 +02:00
..
mce	x86/mce: Make sure to grab mce_sysfs_mutex in set_bank()	2024-04-13 12:51:36 +02:00
microcode	x86/microcode/AMD: Load late on both threads too	2023-07-24 19:10:53 +02:00
mtrr	x86/mtrr: Check if fixed MTRRs exist before saving them	2024-08-19 05:33:53 +02:00
resctrl	x86/resctrl: Only show tasks' pid in current pid namespace	2023-07-27 08:37:04 +02:00
.gitignore
acrn.c
amd.c	x86/CPU/AMD: Update the Zenbleed microcode revisions	2024-04-13 12:51:28 +02:00
aperfmperf.c
bugs.c	x86/cpu: Enable STIBP on AMD if Automatic IBRS is enabled	2024-04-13 12:51:32 +02:00
cacheinfo.c
centaur.c
common.c	x86/cpu: Support AMD Automatic IBRS	2024-04-13 12:51:21 +02:00
cpu.h	x86/speculation: Add Gather Data Sampling mitigation	2023-08-08 19:56:35 +02:00
cpuid-deps.c	x86/cpufeatures: Fix dependencies for GFNI, VAES, and VPCLMULQDQ	2024-05-02 16:18:31 +02:00
cyrix.c
hygon.c	x86/cpu/hygon: Fix the CPU topology evaluation for real	2023-11-28 16:50:18 +00:00
hypervisor.c
intel.c	x86/cpu/intel: Detect TME keyid bits before setting MTRR mask registers	2024-03-06 14:36:10 +00:00
intel_epb.c
intel_pconfig.c
Makefile
match.c	x86/cpu: Add a steppings field to struct x86_cpu_id	2022-10-07 09:16:54 +02:00
mkcapflags.sh
mshyperv.c	random: remove unused irq_flags argument from add_interrupt_randomness()	2022-06-22 14:11:06 +02:00
perfctr-watchdog.c
powerflags.c
proc.c
rdrand.c
scattered.c	x86/cpufeatures: Assign dedicated feature word for CPUID_0x8000001F[EAX]	2023-08-08 19:56:36 +02:00
topology.c	x86/topology: Fix erroneous smp_num_siblings on Intel Hybrid platforms	2023-05-30 12:44:09 +01:00
transmeta.c
tsx.c	x86/tsx: Add a feature bit for TSX control MSR support	2022-12-08 11:23:05 +01:00
umc.c
umwait.c
vmware.c
zhaoxin.c