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Re: [Qemu-arm] [PATCH v2 10/14] target/arm/kvm64: Add kvm_arch_get/put_s
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From: |
Dave Martin |
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Subject: |
Re: [Qemu-arm] [PATCH v2 10/14] target/arm/kvm64: Add kvm_arch_get/put_sve |
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Date: |
Mon, 24 Jun 2019 12:05:35 +0100 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Fri, Jun 21, 2019 at 05:34:18PM +0100, Andrew Jones wrote:
> These are the SVE equivalents to kvm_arch_get/put_fpsimd. Note, the
> swabbing is different than it is for fpsmid because the vector format
> is a little-endian stream of words.
Note, on big-endian hosts the FPSIMD view Vn and the SVE view Zn[127:0]
of the FPSIMD/SVE common register bits has the opposite endianness for
SVE_{GET,SET}_ONE_REG.
This only matters if mixing the two views: just from this patch I don't
know whether this is an issue for QEMU or not.
The kernel and gdb were recently found to be broken in this regard for
userspace [1] but the KVM interface should be unaffected.
Cheers
---Dave
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/kernel?id=41040cf7c5f0f26c368bc5d3016fed3a9ca6dba4
- Re: [Qemu-arm] [PATCH v2 06/14] target/arm: Allow SVE to be disabled via a CPU property, (continued)
Re: [Qemu-arm] [PATCH v2 10/14] target/arm/kvm64: Add kvm_arch_get/put_sve, Auger Eric, 2019/06/27
[Qemu-arm] [PATCH v2 07/14] target/arm/cpu64: max cpu: Introduce sve<vl-bits> properties, Andrew Jones, 2019/06/21