linux-kernel - Re: [PATCH v1 03/11] KVM: x86: dynamic kvm_apic

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Message-ID: <cb1a6135-d891-df68-916b-9c4215d75b7a@redhat.com>
Date:	Fri, 1 Jul 2016 09:33:12 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	"Lan, Tianyu" <tianyu.lan@...el.com>,
	Igor Mammedov <imammedo@...hat.com>,
	Jan Kiszka <jan.kiszka@....de>, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v1 03/11] KVM: x86: dynamic kvm_apic_map



On 30/06/2016 22:54, Radim Krčmář wrote:
> x2APIC supports up to 2^32-1 LAPICs, but most guest in coming years will
> have slighly less VCPUs.  Dynamic size saves memory at the cost of
> turning one constant into a variable.
> 
> apic_map mutex had to be moved before allocation to avoid races with cpu
> hotplug.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>

It's important to note another change here, which is that you start
using the phys_map for x2apic clustered mode.  It's so important that
you could make it a separate patch while keeping the phys_map static! :)

Paolo