linux-kernel - Re: [PATCH v12 00/18] KVM: s390: pv: implement lazy destroy for reboot

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Message-ID: <abed8069-220a-ee32-b4fa-3cff935b539c@linux.ibm.com>
Date:   Thu, 14 Jul 2022 08:59:00 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org
Cc:     borntraeger@...ibm.com, thuth@...hat.com, pasic@...ux.ibm.com,
        david@...hat.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, scgl@...ux.ibm.com,
        mimu@...ux.ibm.com, nrb@...ux.ibm.com
Subject: Re: [PATCH v12 00/18] KVM: s390: pv: implement lazy destroy for
 reboot

On 6/28/22 15:56, Claudio Imbrenda wrote:
> Previously, when a protected VM was rebooted or when it was shut down,
> its memory was made unprotected, and then the protected VM itself was
> destroyed. Looping over the whole address space can take some time,
> considering the overhead of the various Ultravisor Calls (UVCs). This
> means that a reboot or a shutdown would take a potentially long amount
> of time, depending on the amount of used memory.
> 
> This patchseries implements a deferred destroy mechanism for protected
> guests. When a protected guest is destroyed, its memory can be cleared
> in background, allowing the guest to restart or terminate significantly
> faster than before.
> 

Patches 1-12 have spent a considerable amount of time in the CI and I'd 
like to queue them to be able to focus on the rest of the series.

Patch 9 will need two small fixups since there are two conflicts where a 
line was introduced before your addition of the include and the struct 
kvm_s390_pv mmu_notifier member. I.e. it's more of a patch history 
problem than a real conflict.

I'd fix that up when queuing if you're ok with it?