linux-kernel - Re: [PATCH 4/6] x86/kvm: introduce per cpu vcpu masks

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Message-ID: <24b616c4-bbab-a1c8-1be2-a912a2c672d3@suse.com>
Date:   Mon, 26 Jul 2021 15:38:54 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, 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>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 4/6] x86/kvm: introduce per cpu vcpu masks

On 26.07.21 15:32, Paolo Bonzini wrote:
> On 01/07/21 17:41, Juergen Gross wrote:
>> In order to support high vcpu numbers per guest don't use on stack
>> vcpu bitmasks. As all those currently used bitmasks are not used in
>> functions subject to recursion it is fairly easy to replace them with
>> percpu bitmasks.
>>
>> Disable preemption while such a bitmask is being used in order to
>> avoid double usage in case we'd switch cpus.
>>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
> 
> Please use a local_lock instead of disabling preemption.

Okay.


Juergen

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