linux-kernel - Re: [PATCH v1 06/11] KVM: x86: use hardware-compatible format for APIC ID register

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Message-ID: <0547afff-bb34-53dc-c753-3601a9fb7022@redhat.com>
Date:	Fri, 1 Jul 2016 17:07:27 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	"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 06/11] KVM: x86: use hardware-compatible format for
 APIC ID register



On 01/07/2016 16:54, Radim Krčmář wrote:
>> >                                                                (Hint: we
>> > want kvm-unit-tests for this).
> :) Something like this?
> 
>   enable_xapic()
>   id = apic_id()
>   set_apic_id(id+1) // ?
>   enable_x2apic()
>   id == apic_id() & 0xff
>   disable_apic()
>   enable_xapic()
>   id == apic_id()
> 

Yes, plus checking that it "moves" appropriately between low and high bits.

Thanks,

Paolo