On Tue, Nov 19, 2013 at 6:39 PM, Alexander Graf <ag...@suse.de> wrote: > > On 19.11.2013, at 07:12, Liu Ping Fan <kernelf...@gmail.com> wrote: > >> Since kvmppc_hv_find_lock_hpte() is called from both virtmode and >> realmode, so it can trigger the deadlock. >> >> Suppose the following scene: >> >> Two physical cpuM, cpuN, two VM instances A, B, each VM has a group of >> vcpus. >> >> If on cpuM, vcpu_A_1 holds bitlock X (HPTE_V_HVLOCK), then is switched >> out, and on cpuN, vcpu_A_2 try to lock X in realmode, then cpuN will be >> caught in realmode for a long time. >> >> What makes things even worse if the following happens, >> On cpuM, bitlockX is hold, on cpuN, Y is hold. >> vcpu_B_2 try to lock Y on cpuM in realmode >> vcpu_A_2 try to lock X on cpuN in realmode >> >> Oops! deadlock happens >> >> Signed-off-by: Liu Ping Fan <pingf...@linux.vnet.ibm.com> > > Any particular reason for the resend? The patch is already applied, no? > Oh, seems that I misunderstood your meaning. You said "Actually, I've changed my mind and moved the patch to the for-3.13 branch instead. Please make sure to CC kvm@vger on all patches you submit though". So I think it is necessary to resend with cc kvm@vger
Regards, Pingfan _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
