linux-kernel - Re: [RFC PATCH 7/9] kvm_main.c: duplicate invalid memslot also in inactive list

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3e457190-8ebc-2234-5a14-79cab89b393f@redhat.com>
Date:   Wed, 28 Sep 2022 19:18:27 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        kvm@...r.kernel.org
Cc:     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>,
        David Hildenbrand <david@...hat.com>,
        Maxim Levitsky <mlevitsk@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 7/9] kvm_main.c: duplicate invalid memslot also in
 inactive list

On 9/9/22 12:45, Emanuele Giuseppe Esposito wrote:
>   	/*
> -	 * if change is DELETE or MOVE, invalid is in active memslots
> -	 * and old in inactive, so replace old with new.
> +	 * if change is DELETE or MOVE, invalid is in both active and inactive
> +	 * memslot list. This means that we don't need old anymore, and
> +	 * we should replace invalid with new.
>   	 */
> -	kvm_replace_memslot(kvm, batch->old, batch->new);
> +	if (batch->change == KVM_MR_DELETE || batch->change == KVM_MR_MOVE)
> +		kvm_replace_memslot(kvm, batch->invalid, batch->new);
> +	else
> +		kvm_replace_memslot(kvm, batch->old, batch->new);

This is also

	kvm_replace_memslot(kvm, batch->invalid ?: batch->old,
			    batch->new);

with no need to look at batch->change.

Paolo