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x86, hyperv: Bypass the timer_irq_works() check

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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.

[ hpa: I would prefer to not defer things to "the future" in the future... ]

Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: <stable@vger.kernel.org>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: http://lkml.kernel.org/r/1393558229-14755-1-git-send-email-jasowang@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Jason Wang 2014-02-28 11:30:29 +08:00 committed by H. Peter Anvin
parent b098d6726b
commit ca3ba2a2f4
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kernel/cpu/mshyperv.c
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@ -26,6 +26,7 @@
#include <asm/irq_regs.h> #include <asm/irq_regs.h>
#include <asm/i8259.h> #include <asm/i8259.h>
#include <asm/apic.h> #include <asm/apic.h>
#include <asm/timer.h>
struct ms_hyperv_info ms_hyperv; struct ms_hyperv_info ms_hyperv;
EXPORT_SYMBOL_GPL(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) if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE)
clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100); 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 = { const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {