Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extens

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Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extens

From:	Richard Henderson
Subject:	Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1
Date:	Thu, 29 Aug 2019 08:09:12 -0700
User-agent:	Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 8/29/19 5:45 AM, liuzhiwei wrote:
> Even in qemu,  it may be some situations that VSTART != 0. For example, a load
> instruction leads to a page fault exception in a middle position. If VSTART ==
> 0,  some elements that had been loaded before the exception will be loaded 
> once
> again.

Alternately, you can validate all of the pages before performing any memory
operations.  At which point there will never be an exception in the middle.

As it turns out, you *must* do this in order to allow watchpoints to work
correctly.  David Hildebrand and I are at this moment fixing this aspect of
watchpoints for s390x.

See https://lists.gnu.org/archive/html/qemu-devel/2019-08/msg05979.html

r~

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[Qemu-riscv] [PATCH] RISCV: support riscv vector extension 0.7.1, liuzhiwei, 2019/08/28
- Re: [Qemu-riscv] [PATCH] RISCV: support riscv vector extension 0.7.1, Alex Bennée, 2019/08/28
  - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Richard Henderson, 2019/08/28
  - Re: [Qemu-riscv] [PATCH] RISCV: support riscv vector extension 0.7.1, liuzhiwei, 2019/08/29
- Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Richard Henderson, 2019/08/28
  - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Richard Henderson, 2019/08/28
    - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, liuzhiwei, 2019/08/29
    - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Richard Henderson <=
- Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Aleksandar Markovic, 2019/08/28
  - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, liuzhiwei, 2019/08/29
    - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Aleksandar Markovic, 2019/08/29
- Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Alistair Francis, 2019/08/28
  - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, liuzhiwei, 2019/08/29
    - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Richard Henderson, 2019/08/29
    - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Alistair Francis, 2019/08/29
    - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Alex Bennée, 2019/08/30
    - Re: [Qemu-riscv] [Qemu-devel] [PATCH] RISCV: support riscv vector extension 0.7.1, Alistair Francis, 2019/08/30
- Re: [Qemu-riscv] [PATCH] RISCV: support riscv vector extension 0.7.1, Chih-Min Chao, 2019/08/29

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