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kvmclock: Add functions to check if the host has stopped the vm

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When a host stops or suspends a VM it will set a flag to show this.  The
watchdog will use these functions to determine if a softlockup is real, or the
result of a suspended VM.

Signed-off-by: Eric B Munson <emunson@mgebm.net>
asm-generic changes Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Eric B Munson 2012-03-10 14:37:26 -05:00 committed by Avi Kivity
parent eae3ee7d8a
commit 3b5d56b931
27 changed files with 79 additions and 0 deletions
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1
arch/alpha/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/arm/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/avr32/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/blackfin/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/c6x/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/frv/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/h8300/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/hexagon/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

5
arch/ia64/include/asm/kvm_para.h
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@ -26,6 +26,11 @@ static inline unsigned int kvm_arch_para_features(void)
return 0;
}
static inline bool kvm_check_and_clear_guest_paused(void)
{
return false;
}
#endif
#endif

1
arch/m68k/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/microblaze/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/mips/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/mn10300/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/openrisc/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/parisc/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

5
arch/powerpc/include/asm/kvm_para.h
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@ -206,6 +206,11 @@ static inline unsigned int kvm_arch_para_features(void)
return r;
}
static inline bool kvm_check_and_clear_guest_paused(void)
{
return false;
}
#endif /* __KERNEL__ */
#endif /* __POWERPC_KVM_PARA_H__ */

5
arch/s390/include/asm/kvm_para.h
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@ -149,6 +149,11 @@ static inline unsigned int kvm_arch_para_features(void)
return 0;
}
static inline bool kvm_check_and_clear_guest_paused(void)
{
return false;
}
#endif
#endif /* __S390_KVM_PARA_H */

1
arch/score/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/sh/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/sparc/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/tile/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/um/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

1
arch/unicore32/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

8
arch/x86/include/asm/kvm_para.h
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@ -95,6 +95,14 @@ struct kvm_vcpu_pv_apf_data {
extern void kvmclock_init(void);
extern int kvm_register_clock(char *txt);
#ifdef CONFIG_KVM_CLOCK
bool kvm_check_and_clear_guest_paused(void);
#else
static inline bool kvm_check_and_clear_guest_paused(void)
{
return false;
}
#endif /* CONFIG_KVMCLOCK */
/* This instruction is vmcall. On non-VT architectures, it will generate a
* trap that we will then rewrite to the appropriate instruction.

21
arch/x86/kernel/kvmclock.c
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@ -22,6 +22,7 @@
#include <asm/msr.h>
#include <asm/apic.h>
#include <linux/percpu.h>
#include <linux/hardirq.h>
#include <asm/x86_init.h>
#include <asm/reboot.h>
@ -114,6 +115,26 @@ static void kvm_get_preset_lpj(void)
preset_lpj = lpj;
}
bool kvm_check_and_clear_guest_paused(void)
{
bool ret = false;
struct pvclock_vcpu_time_info *src;
/*
* per_cpu() is safe here because this function is only called from
* timer functions where preemption is already disabled.
*/
WARN_ON(!in_atomic());
src = &__get_cpu_var(hv_clock);
if ((src->flags & PVCLOCK_GUEST_STOPPED) != 0) {
__this_cpu_and(hv_clock.flags, ~PVCLOCK_GUEST_STOPPED);
ret = true;
}
return ret;
}
EXPORT_SYMBOL_GPL(kvm_check_and_clear_guest_paused);
static struct clocksource kvm_clock = {
.name = "kvm-clock",
.read = kvm_clock_get_cycles,

1
arch/xtensa/include/asm/kvm_para.h Normal file
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#include <asm-generic/kvm_para.h>

14
include/asm-generic/kvm_para.h Normal file
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#ifndef _ASM_GENERIC_KVM_PARA_H
#define _ASM_GENERIC_KVM_PARA_H
/*
* This function is used by architectures that support kvm to avoid issuing
* false soft lockup messages.
*/
static inline bool kvm_check_and_clear_guest_paused(void)
{
return false;
}
#endif