KVM on IBM PowerEN processor
Hi, everyone, This is Kun Wang from IBM Research China. I and my team have been working on IBM PowerEN processor in recent years, including its simulation, lib/runtime optimization and etc. Now we start the work to enable KVM on PowerEN processor. Since the A2 core of PowerEN follows Power ISA v2.06 (more specifically, book3e and 64-bit), I believe 99% of our work will stick to the ISA, and hence can be leveraged by others. As the new one to this KVM world, I and my team definitely need your help. Looking forward to talking and working with you guys in the future. Best regards, Kun Wang Research Staff Member, Manager of Next-Generation Systems IBM Research China Tel: (86)10-58748491 FAX: (86)10-58748330 E-mail: wang...@cn.ibm.com -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH 4/4] Add check for suspended vm in softlockup detector
A suspended VM can cause spurious soft lockup warnings. To avoid these, the
watchdog now checks if the kernel knows it was stopped by the host and skips
the warning if so.
Signed-off-by: Eric B Munson emun...@mgebm.net
---
kernel/watchdog.c | 12
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 36491cd..4cbb69f 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -25,6 +25,7 @@
#include linux/sysctl.h
#include asm/irq_regs.h
+#include asm/pvclock.h
#include linux/perf_event.h
int watchdog_enabled = 1;
@@ -292,6 +293,17 @@ static enum hrtimer_restart watchdog_timer_fn(struct
hrtimer *hrtimer)
*/
duration = is_softlockup(touch_ts);
if (unlikely(duration)) {
+ /*
+* If a virtual machine is stopped by the host it can look to
+* the watchdog like a soft lockup, check to see if the host
+* stopped the vm before we issue the warning
+*/
+ if (kvm_check_and_clear_host_stopped(get_cpu())) {
+ put_cpu();
+ return HRTIMER_RESTART;
+ }
+ put_cpu();
+
/* only warn once */
if (__this_cpu_read(soft_watchdog_warn) == true)
return HRTIMER_RESTART;
--
1.7.4.1
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[PATCH 1/4] Add flag to indicate that a vm was stopped by the host
This flag will be used to check if the vm was stopped by the host when a soft
lockup was detected.
Signed-off-by: Eric B Munson emun...@mgebm.net
---
arch/x86/include/asm/pvclock-abi.h |1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/pvclock-abi.h
b/arch/x86/include/asm/pvclock-abi.h
index 35f2d19..6167fd7 100644
--- a/arch/x86/include/asm/pvclock-abi.h
+++ b/arch/x86/include/asm/pvclock-abi.h
@@ -40,5 +40,6 @@ struct pvclock_wall_clock {
} __attribute__((__packed__));
#define PVCLOCK_TSC_STABLE_BIT (1 0)
+#define PVCLOCK_GUEST_STOPPED (1 1)
#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_PVCLOCK_ABI_H */
--
1.7.4.1
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