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Re: [Qemu-devel] [PATCH 11/13] target/arm/cpu64: max cpu: Introduce sve-

From: Markus Armbruster
Subject: Re: [Qemu-devel] [PATCH 11/13] target/arm/cpu64: max cpu: Introduce sve-vls-map
Date: Mon, 13 May 2019 17:25:23 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Andrew Jones <address@hidden> writes:

> Introduce another cpu property to control SVE vector lengths,
> sve-vls-map, which allows the user to explicitly select the
> set of vector lengths the guest can use. The map must conform
> to QEMU's limits and architectural constraints, checked when
> the property is set. Inconsistencies with sve-max-vq are also
> checked. The bit number of a set bit in the map represents the
> allowed vector length in number of quadwords.
> Note, as the map is implemented with a single 64-bit word we
> currently only support up to 8192-bit vectors. As QEMU and
> KVM only support up to 2048-bit vectors then this sufficient
> now, and probably for some time. Extending the bitmap beyond
> a single word will likely require changing the property to
> a string and adding yet another parser to QEMU.
> Signed-off-by: Andrew Jones <address@hidden>

Please add an example of how the new property should be used on the
command line to your commit message.  I'd ask for a documentation update
as well if we had any to update.

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