6.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mikhail Paulyshka me@mixaill.net
commit a74bb5f202dabddfea96abc1328fcedae8aa140a upstream.
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: 767ae437a32d ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/amd.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -979,6 +979,9 @@ static void init_amd_zen2(struct cpuinfo 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)