> -----Original Message-----
> From: Jason Wang [mailto:jasow...@redhat.com]
> Sent: Thursday, January 23, 2014 10:03 PM
> To: KY Srinivasan; Haiyang Zhang; t...@linutronix.de; mi...@redhat.com;
> h...@zytor.com; x...@kernel.org; de...@linuxdriverproject.org; linux-
> ker...@vger.kernel.org
> Cc: Jason Wang
> Subject: [PATCH] x86, hyperv: bypass the timer_irq_works() check
>
> This patch bypass the timer_irq_works() check for hyperv guest since:
>
> - It was guaranteed to work.
> - timer_irq_works() may fail sometime due to the lpj calibration were
> inaccurate
> in a hyperv guest or a buggy host.
>
> In the future, we should get the tsc frequency from hypervisor and use preset
> lpj instead.
>
> Cc: K. Y. Srinivasan <k...@microsoft.com>
> Cc: Haiyang Zhang <haiya...@microsoft.com>
> Signed-off-by: Jason Wang <jasow...@redhat.com>
Thanks Jason.
Acked-by: K. Y. Srinivasan <k...@microsoft.com>
> ---
> arch/x86/kernel/cpu/mshyperv.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> index 9f7ca26..832d05a 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -26,6 +26,7 @@
> #include <asm/irq_regs.h>
> #include <asm/i8259.h>
> #include <asm/apic.h>
> +#include <asm/timer.h>
>
> struct ms_hyperv_info ms_hyperv;
> EXPORT_SYMBOL_GPL(ms_hyperv);
> @@ -105,6 +106,11 @@ static void __init ms_hyperv_init_platform(void)
>
> if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE)
> clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100);
> +
> +#ifdef CONFIG_X86_IO_APIC
> + no_timer_check = 1;
> +#endif
> +
> }
>
> const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
> --
> 1.8.3.2
_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
