MIRRORS/linux-yocto
1
0
Fork 0
mirror of git://git.yoctoproject.org/linux-yocto.git synced 2025-10-23 07:23:12 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

x86/CPU/AMD: Disable INVLPGB on Zen2

Browse Source 
AMD Cyan Skillfish (Family 17h, Model 47h, Stepping 0h) has an issue
that causes system oopses and panics when performing TLB flush using
INVLPGB.

However, the problem is that that machine has misconfigured CPUID and
should not report the INVLPGB bit in the first place. So zap the
kernel's representation of the flag so that nothing gets confused.

  [ bp: Massage. ]

Fixes: 767ae437a3 ("x86/mm: Add INVLPGB feature and Kconfig entry")
Signed-off-by: Mikhail Paulyshka <me@mixaill.net>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/1ebe845b-322b-4929-9093-b41074e9e939@mixaill.net
This commit is contained in:
Mikhail Paulyshka 2025-07-08 16:39:10 +02:00 committed by Borislav Petkov (AMD)
parent 5b937a1ed6
commit a74bb5f202
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/kernel/cpu/amd.c
View File

@ -937,6 +937,9 @@ static void init_amd_zen2(struct cpuinfo_x86 *c)
msr_clear_bit(MSR_AMD64_CPUID_FN_7, 18);
pr_emerg("RDSEED is not reliable on this platform; disabling.\n");
}
/* Correct misconfigured CPUID on some clients. */
clear_cpu_cap(c, X86_FEATURE_INVLPGB);
}
static void init_amd_zen3(struct cpuinfo_x86 *c)