---------------------------------------- > Date: Wed, 3 Mar 2010 15:09:17 -0700 > Subject: Re: IVSHMEM and limits on shared memory > From: cam@xxxxxxxxxxxxxx > To: kzm98@xxxxxxxxxxx > CC: kvm@xxxxxxxxxxxxxxx > > On Wed, Mar 3, 2010 at 12:06 AM, Khaled Ibrahim wrote: >> >> Hi Cam, >> >> I used your patches successfully to support shared memory on KVM and >> used the test cases successfully, but qemu-kvm crashes when I increased the >> size of the shared memory. I >> applied the ivshmem patch to qemu-kvm-0.12.3 (some manual patching was >> needed). It worked flawlessly for >> up to 128MB of shared memory on my system. I am running on a machine with 64GB >> memory running opensuse (kernel 2.6.27) on AMD opteron. >> >> Qemu crashes with >> smp=4 and the shared memory requested in 256MB, (512MB with smp=1), even though >> the shared memory file is created. I debugged the problem and it seems that >> some memory corruptions happens. > > Can you please provide the full command-line for the smp=1 instance? qemu-system-x86_64 ./qemudisk0.raw \ -net nic,model=rtl8139,macaddr=52:54:00:12:34:50\ -net tap,ifname=tap0,script=no,downscript=no \ -m 4096 \ -ivshmem 512,kvmshmem\ -smp 1 \ -usb \ -usbdevice tablet \ -localtime > >> >> It crashes in the subpage_register for rtl8139 pci driver!, >> tracked back to rtl8139_mmio_map. The problem starts with corrupted value in >> the config field in the struct for the rtl8139 driver. At offset 20 of this >> field the address should indicate that the address is uninitialized at that >> time of crash, but surprisingly the value changes over the course of execution >> and gets the SIZE of the shared memory allocated (related to ivshmem). I failed >> to identify what changes/corrupts that field. I tried some padding for >> allocation but the field always gets updated with the size of the shared memory >> in a very consistent way. >> > > As far as you know does anything in the guest trigger the corruption? > Does the corruption happen immediately or after running some of the > test programs? The boot process does not complete, and it fails before it reach grub. _________________________________________________________________ Hotmail: Trusted email with Microsoft’s powerful SPAM protection. http://clk.atdmt.com/GBL/go/201469226/direct/01/-- 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
