|
From: | Marc Zyngier |
Subject: | Re: Kernel patch cases qemu live migration failed. |
Date: | Thu, 15 Oct 2020 14:52:34 +0100 |
User-agent: | Roundcube Webmail/1.4.9 |
On 2020-10-15 14:35, Andrew Jones wrote:
On Thu, Oct 15, 2020 at 12:26:10PM +0100, Marc Zyngier wrote:Hi Please don't use my arm.com address anymore, nobody reads it... On 2020-10-15 05:06, 张东旭 wrote: > I'm so sorry for disturbing you. > > When I apply this kernel patch:KVM: arm64/sve: System register > context switch and access support > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/kvm/sys_regs.c?id=73433762fcaeb9d59e84d299021c6b15466c96dd This patch was only introduced in 5.2, and wasn't supposed to be backported to anything else.All upstream patches are backport candidates. Welcome to RHEL :-)
Great! RHEL gets to keep the pieces! ;-)
> qemu live migration will failed with messages: > qemu-kvm: Invalid value 233 expecting positive value > <= 232 > qemu-kvm: Failed to load cpu:cpreg_vmstate_array_len > New version kernel exclude ID_AA64ZFR0_EL1 register when host not > support SVE feature, > so qemu ioctl kvm(KVM_GET_REG_LIST) will not contain ID_AA64ZFR0_EL1 > register. > > I'm using CentOS Linux kernel, old kernel version:4.18.0-80.11.el8 > (migration source) > new kernel version:4.18.0-147.5.el8 (migration destination) > > CentOS linux kernel version 4.18.0-111.el8 applied this patch. So > 4.18.0-147.5.el8 also applied this patch. > > Migration source and destination hosts have the same hardware, just > kernel version is different, > and the hardware on either side of the migration not support SVE. > > Is there some good suggestions,which can make sure old version > kernel live migration to new version kernel with qemu? I['m afraid you should take this with your distribution of choice, unless you can reproduce the problem with mainline kernels.I'll bet this reproduces when migrating from a mainline pre SVE registerfiltering kernel to a mainline that does the filtering. I don't have time to test that though.
Probably. I'm not really sure where to find SVE HW though, other than emulation... M. -- Jazz is not dead. It just smells funny...
[Prev in Thread] | Current Thread | [Next in Thread] |