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Re: [Qemu-devel] [libvirt] [PATCH 0/7] x86: Rework KVM-defaults compat c

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [libvirt] [PATCH 0/7] x86: Rework KVM-defaults compat code, enable kvm_pv_unhalt by default
Date: Tue, 7 Nov 2017 12:21:16 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 14/10/2017 01:56, Eduardo Habkost wrote:
> Now, I don't know yet what's the best default for a guest that
> has CONFIG_PARAVIRT_SPINLOCK when it sees a host that supports
> kvm_pv_unhalt.  But I'm arguing that it's the guest
> responsibility to choose what to do when it detects such a host,
> instead of expecting the host to hide features from the guest.
> The guest and the guest administrator have more information to
> choose what's best.
> In other words, if exposing kvm_pv_unhalt on CPUID really makes
> some guests behave poorly, can we fix the guests instead?

Waiman just did it. :)



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