brain-hackers_pepepper-mirror
/
linux-brain
mirror of https://github.com/brain-hackers/linux-brain.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

x86/xen: use capabilities instead of fake cpuid values for x2apic 

When running as pv domain xen_cpuid() is being used instead of
native_cpuid(). In xen_cpuid() the x2apic feature is indicated as not
being present by special casing the related cpuid leaf.

Instead of delivering fake cpuid values clear the cpu capability bit
for x2apic instead.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2017-04-12 12:45:57 +02:00
parent ea01598b4b
commit e657fccb79
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/xen/enlighten_pv.c
View File

@ -286,8 +286,6 @@ static void __init xen_init_cpuid_mask(void)
unsigned int ax, bx, cx, dx;
unsigned int xsave_mask;
cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32));
ax = 1;
cx = 0;
cpuid(1, &ax, &bx, &cx, &dx);
@ -309,6 +307,7 @@ static void __init xen_init_capabilities(void)
setup_clear_cpu_cap(X86_FEATURE_APERFMPERF);
setup_clear_cpu_cap(X86_FEATURE_MTRR);
setup_clear_cpu_cap(X86_FEATURE_ACC);
setup_clear_cpu_cap(X86_FEATURE_X2APIC);
if (!xen_initial_domain())
setup_clear_cpu_cap(X86_FEATURE_ACPI);