linux-kernel - Re: [PATCH v2] target-i386: add KVM_HINTS

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Message-ID: <20180209143117.GL13981@localhost.localdomain>
Date:   Fri, 9 Feb 2018 12:31:17 -0200
From:   Eduardo Habkost <ehabkost@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2] target-i386: add KVM_HINTS_DEDICATED performance hint

On Fri, Feb 09, 2018 at 06:15:25AM -0800, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@...cent.com>
> 
> Add KVM_HINTS_DEDICATED performance hint, guest checks this feature bit
> to determine if they run on dedicated vCPUs, allowing optimizations such 
> as usage of qspinlocks.  
> 
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Cc: Eduardo Habkost <ehabkost@...hat.com>
> Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
[...]
> +    [FEAT_KVM_HINTS] = {
> +        .feat_names = {
> +            "hint-dedicated", NULL, NULL, NULL,
> +            NULL, NULL, NULL, NULL,
> +            NULL, NULL, NULL, NULL,
> +            NULL, NULL, NULL, NULL,
> +            NULL, NULL, NULL, NULL,
> +            NULL, NULL, NULL, NULL,
> +            NULL, NULL, NULL, NULL,
> +            NULL, NULL, NULL, NULL,
> +        },
> +        .cpuid_eax = KVM_CPUID_FEATURES, .cpuid_reg = R_EDX,
> +        .tcg_features = TCG_KVM_FEATURES,
> +    },

Do you have a pointer to the KVM patch that adds this bit to
Documentation/virtual/kvm/cpuid.txt?  I would like to wait until
the KVM CPUID docs are updated before applying the patch to QEMU.

-- 
Eduardo