linux-kernel - Re: [RFC PATCH 9/9] kvm_main.c: handle atomic memslot update

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Message-ID: <cde8be9d-64c0-80e5-7663-4302d075dcbc@redhat.com>
Date:   Tue, 27 Sep 2022 09:46:07 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Maxim Levitsky <mlevitsk@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 9/9] kvm_main.c: handle atomic memslot update

On 09.09.22 12:45, Emanuele Giuseppe Esposito wrote:
> When kvm_vm_ioctl_set_memory_region_list() is invoked, we need
> to make sure that all memslots are updated in the inactive list
> and then swap (preferreably only once) the lists, so that all
> changes are visible immediately.
> 
> The only issue is that DELETE and MOVE need to perform 2 swaps:
> firstly replace old memslot with invalid, and then remove invalid.
> 

I'm curious, how would a resize (grow/shrink) or a split be handled?

-- 
Thanks,

David / dhildenb