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Re: [Qemu-devel] [PATCH 05/13] target/arm/kvm: Add kvm_arch_get/put_sve

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 05/13] target/arm/kvm: Add kvm_arch_get/put_sve
Date: Mon, 13 May 2019 16:40:52 +0100

On Mon, 13 May 2019 at 16:31, Dave Martin <address@hidden> wrote:
> On Mon, May 13, 2019 at 02:55:01PM +0100, Andrew Jones wrote:
> > QEMU keeps its 128-bit and larger words in the same order (least
> > significant word first) for both host endian types. We need to
> > do word swapping every time we set/get them to/from KVM.
> I'm not sure whether this is appropriate here, though it depends on
> what QEMU does with the data.

The layout is optimised for TCG emulation to be able
to work with it, I think (rth would have the definite
reason, though).

> Something non-obvious to be aware of:
> As exposed through the signal frame and the KVM ABI, the memory
> representation of an SVE reg is invariant with respect to the
> endianness.

Yes; we handle this conversion as we write out the signal frame:

-- PMM

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