On 08/05/2012 03:58 PM, Gleb Natapov wrote:
> Usually all APICs are HW enabled so the check can be optimized out.
>
> Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
> ---
> arch/x86/kvm/lapic.c | 29 ++++++++++++++++++++++++++++-
> arch/x86/kvm/lapic.h | 1 +
> arch/x86/kvm/x86.c | 1 +
> 3 files changed, 30 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index c3f14fe..1aa5528 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -34,6 +34,7 @@
> #include <asm/current.h>
> #include <asm/apicdef.h>
> #include <linux/atomic.h>
> +#include <linux/jump_label.h>
> #include "kvm_cache_regs.h"
> #include "irq.h"
> #include "trace.h"
> @@ -117,9 +118,13 @@ static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
> return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
> }
>
> +struct static_key_deferred apic_hw_disabled __read_mostly;
On top of file please. Add all_ to the name to make it clear we're
talking about all apics.
> +
> static inline int apic_hw_enabled(struct kvm_lapic *apic)
> {
> - return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
> + if (static_key_false(&apic_hw_disabled.key))
> + return apic->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
Hm, for the test to be readable, it needs to be
if (static_key_false(&all_apics_hw_enabled))
--
error compiling committee.c: too many arguments to function
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