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Re: [PATCH v3 6/7] tcg: implement JIT for iOS and Apple Silicon
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [PATCH v3 6/7] tcg: implement JIT for iOS and Apple Silicon |
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Date: |
Wed, 28 Oct 2020 11:53:58 +0000 |
On Tue, Oct 27, 2020 at 08:07:00PM -0700, Joelle van Dyne wrote:
> On iOS, we cannot allocate RWX pages without special entitlements. As a
> workaround, we can allocate a RX region and then mirror map it to a separate
> RX region. Then we can write to one region and execute from the other one.
"separate RW region"? The sentence doesn't seem to make sense if both
regions are RX.
>
> When entitlements are available (macOS or jailbroken iOS), a hardware
> feature called APRR exists on newer Apple Silicon that can cheaply mark JIT
> pages as either RX or RW. Reverse engineered functions from
> libsystem_pthread.dylib are implemented to handle this.
What does "Reverse engineered functions" mean? We cannot accept code
into QEMU that is a potential liability if Apple could claim it has been
copied, derived, etc without permission. If libsystem_pthread.dylib is
open source, especially under a permissive license, then it's probably
okay.
Can you clarify?
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- Re: [PATCH v3 3/7] qemu: add support for iOS host, (continued)
[PATCH v3 4/7] coroutine: add libucontext as external library, Joelle van Dyne, 2020/10/27
[PATCH v3 5/7] slirp: update build flags for iOS resolv fix, Joelle van Dyne, 2020/10/27
[PATCH v3 6/7] tcg: implement JIT for iOS and Apple Silicon, Joelle van Dyne, 2020/10/27
- Re: [PATCH v3 6/7] tcg: implement JIT for iOS and Apple Silicon,
Stefan Hajnoczi <=
[PATCH v3 7/7] block: check availablity for preadv/pwritev on mac, Joelle van Dyne, 2020/10/27
Re: [PATCH v3 0/7] iOS and Apple Silicon host support, Stefan Hajnoczi, 2020/10/28