Displaying 4 results from an estimated 4 matches for "cpuid_leaf1_edx_mask".
2009 Aug 25
2
[PATCH 1/1] XEN: enlighten, use uninitialized_var(cx)
...e90540a..5ab75e2 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -202,7 +202,7 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
static __init void xen_init_cpuid_mask(void)
{
- unsigned int ax, bx, cx, dx;
+ unsigned int ax, bx, uninitialized_var(cx), dx;
cpuid_leaf1_edx_mask =
~((1 << X86_FEATURE_MCE) | /* disable MCE */
--
1.6.3.3
2009 Aug 25
2
[PATCH 1/1] XEN: enlighten, use uninitialized_var(cx)
...e90540a..5ab75e2 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -202,7 +202,7 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
static __init void xen_init_cpuid_mask(void)
{
- unsigned int ax, bx, cx, dx;
+ unsigned int ax, bx, uninitialized_var(cx), dx;
cpuid_leaf1_edx_mask =
~((1 << X86_FEATURE_MCE) | /* disable MCE */
--
1.6.3.3
2009 Aug 25
2
[PATCH 1/1] XEN: enlighten, use uninitialized_var(cx)
...e90540a..5ab75e2 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -202,7 +202,7 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
static __init void xen_init_cpuid_mask(void)
{
- unsigned int ax, bx, cx, dx;
+ unsigned int ax, bx, uninitialized_var(cx), dx;
cpuid_leaf1_edx_mask =
~((1 << X86_FEATURE_MCE) | /* disable MCE */
--
1.6.3.3
2012 May 22
20
[PATCH] RFC: Linux: disable APERF/MPERF feature in PV kernels
Hi,
while testing some APERF/MPERF semantics I discovered that this feature
is enabled in Xen Dom0, but is not reliable.
The Linux kernel''s scheduler uses this feature if it sees the CPUID bit,
leading to costly RDMSR traps (a few 100,000s during a kernel compile)
and bogus values due to VCPU migration during the measurement.
The attached patch explicitly disables this CPU capability