On Mon, 05 Mar 2012, Marcelo Tosatti wrote: > On Tue, Feb 14, 2012 at 04:17:20PM -0500, Eric B Munson wrote: > > On Tue, 14 Feb 2012, Marcelo Tosatti wrote: > > > > > On Tue, Feb 14, 2012 at 10:50:13AM -0500, Eric B Munson wrote: > > > > On Tue, 14 Feb 2012, Marcelo Tosatti wrote: > > > > > > > > > On Tue, Feb 14, 2012 at 10:29:31AM -0500, Eric B Munson wrote: > > > > > > On Wed, 08 Feb 2012, Eric B Munson wrote: > > > > > > > > > > > > > > > > > > > > When a guest kernel is stopped by the host hypervisor it can look like a soft > > > > > > > lockup to the guest kernel. This false warning can mask later soft lockup > > > > > > > warnings which may be real. This patch series adds a method for a host > > > > > > > hypervisor to communicate to a guest kernel that it is being stopped. The > > > > > > > final patch in the series has the watchdog check this flag when it goes to > > > > > > > issue a soft lockup warning and skip the warning if the guest knows it was > > > > > > > stopped. > > > > > > > > > > > > > > It was attempted to solve this in Qemu, but the side effects of saving and > > > > > > > restoring the clock and tsc for each vcpu put the wall clock of the guest behind > > > > > > > by the amount of time of the pause. This forces a guest to have ntp running > > > > > > > in order to keep the wall clock accurate. > > > > > > > > > > > > Avi, > > > > > > > > > > > > Is this set fit for merging or is there something else you want changed? > > > > > > > > > > Eric, > > > > > > > > > > On Message-ID: <20120210160536.GA23363@xxxxxxxx>, i asked: > > > > > > > > > > How is the stub getting included for other architectures again? > > > > > > > > > > > > > Marcelo, > > > > > > > > Sorry, I put out V13 to answer that. There is a stub in asm-generic that was > > > > lost in the V11-V12 rebase. This stub has be included in the V13 set. > > > > > > > > Eric > > > > > > Eric, > > > > > > I know the stub has been included in the series. But i am asking how > > > it is #include'ed for other architectures? (can't see that). > > > > Marcelo, > > > > kernel/watchdog.c now includes linux/kvm_para.h which includes asm/kvm_para.h. > > The check_and_clear function is defined in arch include/asm/kvm_para.h or in > > asm-generic/kvm_para.h for any arch lacking the specific header in their asm > > include dir. If I have misunderstood how these headers work, please let me > > know and I will fix it. > > There is no automatic inclusion of asm-generic/ headers. You must create > kvm_para.h in each architecture's include/asm/ directory, #including > asm-generic/kvm_para.h. > Hopefully V16 handles this properly, please let me know if there is anything that needs to be addressed. I'd like to see this set in for the 3.4 window. Eric
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