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.
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.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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