[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/3] xen/x86: Query for paddr_bits in early_cpu_detect()
It is __read_mostly, so repeatedly writing to it is suboptiomal. As the MTRRs have already been set up, nothing good will come from its value changing across CPUs. Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> --- CC: Jan Beulich <JBeulich@xxxxxxxx> --- xen/arch/x86/cpu/common.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c index 02f2504..ac8a258 100644 --- a/xen/arch/x86/cpu/common.c +++ b/xen/arch/x86/cpu/common.c @@ -207,6 +207,9 @@ static void __init early_cpu_detect(void) /* Leaf 0x1 capabilities filled in early for Xen. */ c->x86_capability[cpufeat_word(X86_FEATURE_FPU)] = cap0; c->x86_capability[cpufeat_word(X86_FEATURE_XMM3)] = cap4; + + if ( cpuid_eax(0x80000000) >= 0x80000008 ) + paddr_bits = cpuid_eax(0x80000008) & 0xff; } static void __cpuinit generic_identify(struct cpuinfo_x86 *c) @@ -254,8 +257,6 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c) } if ( c->extended_cpuid_level >= 0x80000004 ) get_model_name(c); /* Default name */ - if ( c->extended_cpuid_level >= 0x80000008 ) - paddr_bits = cpuid_eax(0x80000008) & 0xff; } /* Might lift BIOS max_leaf=3 limit. */ -- 2.1.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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