linux-kernel - Re: [PATCH v2 1/7] KVM: nVMX: Introduce nested_evmcs_is

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]

Date:   Mon, 24 May 2021 16:37:59 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] KVM: nVMX: Introduce nested_evmcs_is_used()

Paolo Bonzini <pbonzini@...hat.com> writes:

> On 24/05/21 16:09, Vitaly Kuznetsov wrote:
>> You mean we'll be using:
>> 
>> "hv_evmcs_ptr == 0" meaning "no evmcs" (like now)
>> "hv_evmcs_ptr == -1" meaing "evmcs not yet mapped" (and
>> nested_evmcs_is_used() will check for both '0' and '-1')
>> "hv_evmcs_ptr == anything else" - eVMCS mapped.
>
> I was thinking of:
>
> hv_evmcs_ptr == -1 meaning no evmcs
>
> hv_evmcs == NULL meaning "evmcs not yet mapped" (I think)
>
> hv_evmcs != NULL meaning "evmcs mapped".
>
> As usual with my suggestions, I'm not sure if this makes sense :) but if 
> it does, the code should be nicer.

Ok, let me try this!

-- 
Vitaly