Hello gem5 users,

I was wondering if it is possible to start a FS ARM simulation using KVM, switch to another CPU type such as Atomic, then restore the CPU type(Atomic), and maybe even switch again to O3.

I have tried to do this using the standard library but I have encountered some errors such as:

build/ALL/sim/serialize.hh:379: fatal: fatal condition !paramInImpl(cp, name, param) occurred: Can't unserialize 'board.processor.start.core:_pid'

I am using:
platform VExpress_Gem5_V1 (since it's the only one I found to work with KVM)
release ArmRelease.for_kvm()

I used this for both the checkpointing and restoring simulations (I found the release worked for non KVM CPUs when not restoring).

Thank you for any help!
Abdal

Hello Jason,

I have attached the files of the checkpoint/restoring.

Thank you for your help.
Abdal

From: Jason Lowe-Power jason@lowepower.com
Sent: Tuesday, August 1, 2023 7:35 PM
To: The gem5 Users mailing list gem5-users@gem5.org
Cc: AbdelQader AlKilany abdelqader.alkilany@huawei.com
Subject: Re: [gem5-users] ARM KVM Switch + Restoration

This should work... can you provide an example script and specific commands to reproduce the error?

Thanks,
Jason

On Tue, Aug 1, 2023 at 11:24 AM AbdelQader AlKilany via gem5-users <gem5-users@gem5.orgmailto:gem5-users@gem5.org> wrote:
Hello gem5 users,

I was wondering if it is possible to start a FS ARM simulation using KVM, switch to another CPU type such as Atomic, then restore the CPU type(Atomic), and maybe even switch again to O3.

I have tried to do this using the standard library but I have encountered some errors such as:

build/ALL/sim/serialize.hh:379: fatal: fatal condition !paramInImpl(cp, name, param) occurred: Can't unserialize 'board.processor.start.core:_pid'

I am using:
platform VExpress_Gem5_V1 (since it’s the only one I found to work with KVM)
release ArmRelease.for_kvm()

I used this for both the checkpointing and restoring simulations (I found the release worked for non KVM CPUs when not restoring).

Thank you for any help!
Abdal

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