I see, so it's minor performance gain, and not stability related option which is good. I am checking http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.11.5-trusty/, changelog showing lsr function is included, but when I download and extract kvm.ko out then run nm kvm.ko | grep lsr, nothing found. On Thu, Dec 4, 2014 at 12:32 PM, Zhang Haoyu <zhanghy@xxxxxxxxxxx> wrote: >>what does vapic affect Windows 7 at all if I disable it? if it just a >>minor performance drop, I am fine with that. >> > hv_vapic provides accelerated MSR access to high usage memory mapped APIC > registers, EOI, ICR, TPR. > You can gain performance promotion from it, not too much, > but it also depends on the frequency of access to above three apic regs. > >>On Thu, Dec 4, 2014 at 10:06 AM, Zhang Haoyu <zhanghy@xxxxxxxxxxx> wrote: >>>>Sure, but I am little confused as KVM is part of linux kernel now, if >>>>I want to try it, should I just upgrade kernel or compile kvm kernel >>>>module by myself ?! >>>> >>> You can just apply the patch to kvm module and rebuild it. >>> >>>>On Thu, Dec 4, 2014 at 10:01 AM, Zhang Haoyu <zhanghy@xxxxxxxxxxx> wrote: >>>>>>I just confirmed that vapic is causing win7 stuck. >>>>>> >>>>> You'd better try the commit fc57ac2c9ca :-) >>>>> >>>>>>On Thu, Dec 4, 2014 at 9:34 AM, Thomas Lau <tlau@xxxxxxxxxxxxxxxxxx> wrote: >>>>>>> Hi, >>>>>>> >>>>>>> I don't want to recompile stuff, does it matter to have hv_vapic on at all? >>>>>>> >>>>>>> On Thu, Dec 4, 2014 at 9:24 AM, Zhang Haoyu <zhanghy@xxxxxxxxxxx> wrote: >>>>>>>>> Oh I see, >>>>>>>>> >>>>>>>>> So 101 BSOD problem is well known? Can't find any document mention about 101 BSOD online. >>>>>>>>> >>>>>>>>> I tried to use hv_ other options but Win7 can't boot up properly and stucked at starting Windows screen. >>>>>>>>> >>>>>>>> Could you confirm that the stuck was caused by vhich hv feature? >>>>>>>> The commit fc57ac2c9ca can resolve a stuck caused by hv_vapic which I encountered before. >>>>>>>> https://git.kernel.org/cgit/virt/kvm/kvm.git/commit/arch/x86/kvm/lapic.c?id=fc57ac2c9ca8109ea97fcc594f4be436944230cc >>>>>>>> >>>>>>>>> Sent from my BlackBerry 10 smartphone. >>>>>>>>> Original Message >>>>>>>>> From: Vadim Rozenfeld >>>>>>>>> Sent: Wednesday, 3 December, 2014 7:30 PM >>>>>>>>> To: Thomas Lau >>>>>>>>> Cc: Zhang Haoyu; kvm; imammedo >>>>>>>>> Subject: Re: Windows 7 VM BSOD >>>>>>>>> >>>>>>>>> If you run WS2008(R2) or Win7 - always turn on relaxed timing. Otherwise >>>>>>>>> it's just a matter of time when you hit 101 BOSD. >>>>>>>>> Bugcheck 78 is quite rare one. What is your setup, and how easy it's >>>>>>>>> reproducible? >>>>>>>>> >>>>>>>>> Best regards, >>>>>>>>> Vadim. >>>>>>>>> >>>>>>>>> On Wed, 2014-12-03 at 19:13 +0800, Thomas Lau wrote: >>>>>>>>> > "it works on your side" meaning that you had such issue but afterwards >>>>>>>>> > it's all fixed by apply hv_relaxed ? >>>>>>>>> > >>>>>>>>> > On Wed, Dec 3, 2014 at 7:08 PM, Zhang Haoyu <zhanghy@xxxxxxxxxxx> wrote: >>>>>>>>> > >> https://bugzilla.redhat.com/show_bug.cgi?id=893857 >>>>>>>>> > >> >>>>>>>>> > >> In fact I am doing testing now, but are we fixing one problem and >>>>>>>>> > >> introduce other problem?! >>>>>>>>> > >> >>>>>>>>> > > I'm not sure about this, but it works on my side, >>>>>>>>> > > I think BSOD(error:0x00000078) has been fixed, >>>>>>>>> > > please show your environment. >>>>>>>>> > > >>>>>>>>> > > Thanks, >>>>>>>>> > > Zhang Haoyu >>>>>>>>> > >> On Wed, Dec 3, 2014 at 6:36 PM, Thomas Lau <tlau@xxxxxxxxxxxxxxxxxx> wrote: >>>>>>>>> > >> > Hi, >>>>>>>>> > >> > >>>>>>>>> > >> > How do I know if my qemu-kvm version support this? >>>>>>>>> > >> > >>>>>>>>> > >> > On Wed, Dec 3, 2014 at 6:25 PM, Zhang Haoyu <zhanghy@xxxxxxxxxxx> wrote: >>>>>>>>> > >> >>> Hi All, >>>>>>>>> > >> >>> >>>>>>>>> > >> >>> I am running 3.13.0-24-generic kernel on Ubuntu 14, Windows 7 VM >>>>>>>>> > >> >>> installation was fine, but it does random reboot by itself, the error >>>>>>>>> > >> >>> code is 0x00000101, does anyone know how to fix this? >>>>>>>>> > >> >> Could you try hv_relaxed, like "-cpu kvm64,hv_relaxed". >>>>>>>>> > >> >> >>>>>>>>> > >> >> Thanks, >>>>>>>>> > >> >> Zhang Haoyu >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> Thomas Lau >>>>>>> Director of Infrastructure >>>>>>> Tetrion Capital Limited >>>>>>> >>>>>>> Direct: +852-3976-8903 >>>>>>> Mobile: +852-9323-9670 >>>>>>> Address: 20/F, IFC 1, Central district, Hong Kong > -- Thomas Lau Director of Infrastructure Tetrion Capital Limited Direct: +852-3976-8903 Mobile: +852-9323-9670 Address: 20/F, IFC 1, Central district, Hong Kong -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
