This is a note to let you know that I've just added the patch titled
x86, hyperv: Bypass the timer_irq_works() check
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-hyperv-bypass-the-timer_irq_works-check.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ca3ba2a2f4a49a308e7d78c784d51b2332064f15 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@xxxxxxxxxx>
Date: Fri, 28 Feb 2014 11:30:29 +0800
Subject: x86, hyperv: Bypass the timer_irq_works() check
From: Jason Wang <jasowang@xxxxxxxxxx>
commit ca3ba2a2f4a49a308e7d78c784d51b2332064f15 upstream.
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@xxxxxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Acked-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1393558229-14755-1-git-send-email-jasowang@xxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/mshyperv.c | 6 ++++++
1 file changed, 6 insertions(+)
--- 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_platfo
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 = {
Patches currently in stable-queue which might be from jasowang@xxxxxxxxxx are
queue-3.14/x86-hyperv-bypass-the-timer_irq_works-check.patch
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