From: Ian Campbell <ian.campbell@citrix.com>
To: Chen Baozi <cbz@baozis.org>
Cc: Julien Grall <julien.grall@citrix.com>,
xen-devel@lists.xenproject.org, Chen Baozi <baozich@gmail.com>
Subject: Re: [PATCH v8 2/8] xen/arm: Add functions of mapping between vCPUID and virtual affinity
Date: Wed, 17 Jun 2015 13:48:51 +0100 [thread overview]
Message-ID: <1434545331.13744.362.camel@citrix.com> (raw)
In-Reply-To: <1434097969-16793-3-git-send-email-cbz@baozis.org>
On Fri, 2015-06-12 at 16:32 +0800, Chen Baozi wrote:
> From: Chen Baozi <baozich@gmail.com>
>
> GICv3 restricts that the maximum number of CPUs in affinity 0 (one
> cluster) is 16. (See the note of 'Bits[15:0]' in '5.7.29 ICC_SGI0R_EL1
> ICC_SGI1R_EL1 and ICC_ASGI1R_EL1, GICv3 Architecture Specification')
> That is to say the upper 4 bits of affinity 0 is unused. Current
> implementation considers that AFF0 is equal to vCPUID, which makes all
> vCPUs in one cluster, limiting its number to 16. If we would like to
> support more than 16 number of vCPU in one guest, we need to make use
> of AFF1. Considering the unused upper 4 bits, we need to create a pair
> of functions mapping the vCPUID and virtual affinity.
>
> Signed-off-by: Chen Baozi <baozich@gmail.com>
> Reviewed-by: Julien Grall <julien.grall@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
next prev parent reply other threads:[~2015-06-17 12:48 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-12 8:32 [PATCH v8 0/8] Support more than 8 vcpus on arm64 with GICv3 Chen Baozi
2015-06-12 8:32 ` [PATCH v8 1/8] xen/arm: gic-v3: Increase the size of GICR in address space for guest Chen Baozi
2015-06-12 8:32 ` [PATCH v8 2/8] xen/arm: Add functions of mapping between vCPUID and virtual affinity Chen Baozi
2015-06-17 12:48 ` Ian Campbell [this message]
2015-06-12 8:32 ` [PATCH v8 3/8] xen/arm: Use the new functions for vCPUID/vaffinity transformation Chen Baozi
2015-06-17 12:50 ` Ian Campbell
2015-06-12 8:32 ` [PATCH v8 4/8] xen/arm: Use AFF1 when translating ICC_SGI1R_EL1 to cpumask Chen Baozi
2015-06-17 13:00 ` Ian Campbell
2015-06-17 13:13 ` Julien Grall
2015-06-17 13:19 ` Ian Campbell
2015-06-17 13:32 ` Julien Grall
2015-06-12 8:32 ` [PATCH v8 5/8] tools/libxl: Set 'reg' of cpu node equal to MPIDR affinity for domU Chen Baozi
2015-06-12 8:32 ` [PATCH v8 6/8] xen/arm: Set 'reg' of cpu node for dom0 to match MPIDR's affinity Chen Baozi
2015-06-12 8:32 ` [PATCH v8 7/8] xen/arm: make domain_max_vcpus return value from vgic_ops Chen Baozi
2015-06-17 13:02 ` Ian Campbell
2015-06-12 8:32 ` [PATCH v8 8/8] xen/arm64: increase MAX_VIRT_CPUS to 128 on arm64 Chen Baozi
2015-06-17 13:03 ` Ian Campbell
2015-06-17 13:04 ` [PATCH v8 0/8] Support more than 8 vcpus on arm64 with GICv3 Ian Campbell
2015-06-17 13:45 ` Julien Grall
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