| Message ID | 20160613080714.GA25425@citrix.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Jun 13, 2016 at 09:07:14AM +0100, Wei Liu wrote: > CC Anthony and Stefano > > Anthony, I think this is also related to the QEMU mainline migration > failure. > > On Mon, Jun 13, 2016 at 05:59:48AM +0000, Zhang, PengtaoX wrote: > > Bug detailed description: > > ---------------- > > 1. Rhel7u2 guest with kernel 4.6.0 migrate failed > > 2. Rhel7u2 guest with kernel 4.6.0 restore failed > > 3. Rhel7u2 guest with default kernel (3.10.0) can be restored and migrate successfully > > > > Environment : > > ---------------- > > HW: Skylake-SP > > Xen: Xen 4.7.0 RC4 > > Dom0: Linux 4.5.2 stable > > > > Reproduce steps: > > ---------------- > > Prepare test environment > > 1.Install redhat 6.7 OS on Skylake-SP platform as base OS , then compile and install ,xen and Dom0, reboot from xen . > > 2.Create a rhel7.2 guest with kernel 4.6.0 via : > > xl create config.rhel7u2-4.6 > > > > Save/Restore test > > 1.After boot up guest with kernel 4.6.0 then : > > xl save $dom_id $save_guest.img > > 2.After save guest do > > xl restore $save_guest.img > > 3.Current status is guest with kernel 4.6.0 can be save successfully ,but restore guest failed . Guest with default kernel can be save/restore successfully . > > > > Migrate test > > 1. After boot up guest with kernel 4.6.0 then : > > xl migrate $dom_id localhost > > 2. Current status is guest with kernel 4.6.0 migrate failed . Guest with default kernel can be migrate successfully . > > > > Base error log: > > ---------------- > > rhel7u2_4.6.0_SR_fail.log file only for Save/Restore test , other log file are for migrate test . > > > > > > Regards, > > Pengtao > > > > > > > In the QEMU log file: > > qemu-system-i386: Expected vmdescription section, but got 0 > > That means should_send_vmdesc() returns true in migration/savevm.c. > > It could be that we need to explicitly set supress_vmdesc in machine > description. > > Does the following hack make it work? > > Wei. > > --- > diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c > index 631bd8d..8556116 100644 > --- a/hw/i386/pc_piix.c > +++ b/hw/i386/pc_piix.c > @@ -469,6 +469,7 @@ static void pc_xen_hvm_init(MachineState *machine) > if (bus != NULL) { > pci_create_simple(bus, -1, "xen-platform"); > } > + machine->suppress_vmdesc = true; > } > #endif > Actually I don't think this hack makes much sense. There is no need to try it... I will wait for QEMU maintainers to comment on this. Wei. > > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@lists.xen.org > > http://lists.xen.org/xen-devel >
On Mon, Jun 13, 2016 at 09:07:14AM +0100, Wei Liu wrote: > CC Anthony and Stefano > > Anthony, I think this is also related to the QEMU mainline migration > failure. I don't think it is. The quote does not have anything regarding using QEMU mainline. Also the migration failure in mainline does not affect any release. > On Mon, Jun 13, 2016 at 05:59:48AM +0000, Zhang, PengtaoX wrote: > > Bug detailed description: > > ---------------- > > 1. Rhel7u2 guest with kernel 4.6.0 migrate failed > > 2. Rhel7u2 guest with kernel 4.6.0 restore failed > > 3. Rhel7u2 guest with default kernel (3.10.0) can be restored and migrate successfully > > > > Environment : > > ---------------- > > HW: Skylake-SP > > Xen: Xen 4.7.0 RC4 > > Dom0: Linux 4.5.2 stable > > > > Reproduce steps: > > ---------------- > > Prepare test environment > > 1.Install redhat 6.7 OS on Skylake-SP platform as base OS , then compile and install ,xen and Dom0, reboot from xen . > > 2.Create a rhel7.2 guest with kernel 4.6.0 via : > > xl create config.rhel7u2-4.6 > > > > Save/Restore test > > 1.After boot up guest with kernel 4.6.0 then : > > xl save $dom_id $save_guest.img > > 2.After save guest do > > xl restore $save_guest.img > > 3.Current status is guest with kernel 4.6.0 can be save successfully ,but restore guest failed . Guest with default kernel can be save/restore successfully . > > > > Migrate test > > 1. After boot up guest with kernel 4.6.0 then : > > xl migrate $dom_id localhost > > 2. Current status is guest with kernel 4.6.0 migrate failed . Guest with default kernel can be migrate successfully . > > > > Base error log: > > ---------------- > > rhel7u2_4.6.0_SR_fail.log file only for Save/Restore test , other log file are for migrate test . > > > > > > Regards, > > Pengtao > > > > > > > In the QEMU log file: > > qemu-system-i386: Expected vmdescription section, but got 0 I've seen this log message, it does not appear to affect the migration, as migration usully succeed and this message is always present. I haven't investigate. > That means should_send_vmdesc() returns true in migration/savevm.c. > > It could be that we need to explicitly set supress_vmdesc in machine > description. That won't work, we should be able to use QEMU with -machine xenfv or -machine pc,accel=xen.
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index 631bd8d..8556116 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -469,6 +469,7 @@ static void pc_xen_hvm_init(MachineState *machine) if (bus != NULL) { pci_create_simple(bus, -1, "xen-platform"); } + machine->suppress_vmdesc = true; } #endif