[GIT pull] x86 fix for 4.17

From: Thomas Gleixner
Date: Sun May 06 2018 - 04:03:28 EST


Linus,

please pull the latest x86-urgent-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

Unbreak the CPUID CPUID_8000_0008_EBX reload which got dropped when the
evaluation of physical and virtual bits which uses the same CPUID leaf was
moved out of get_cpu_cap(),

Thanks,

tglx

------------------>
Thomas Gleixner (1):
x86/cpu: Restore CPUID_8000_0008_EBX reload


arch/x86/kernel/cpu/common.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 8a5b185735e1..ce243f7d2d4e 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -848,6 +848,11 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
c->x86_power = edx;
}

+ if (c->extended_cpuid_level >= 0x80000008) {
+ cpuid(0x80000008, &eax, &ebx, &ecx, &edx);
+ c->x86_capability[CPUID_8000_0008_EBX] = ebx;
+ }
+
if (c->extended_cpuid_level >= 0x8000000a)
c->x86_capability[CPUID_8000_000A_EDX] = cpuid_edx(0x8000000a);

@@ -871,7 +876,6 @@ static void get_cpu_address_sizes(struct cpuinfo_x86 *c)

c->x86_virt_bits = (eax >> 8) & 0xff;
c->x86_phys_bits = eax & 0xff;
- c->x86_capability[CPUID_8000_0008_EBX] = ebx;
}
#ifdef CONFIG_X86_32
else if (cpu_has(c, X86_FEATURE_PAE) || cpu_has(c, X86_FEATURE_PSE36))