qemu: backport M1 HVF patches to support recent Linux guests

[AkihiroSuda]

Update (Mar 14, 2022): The content of this PR was merged into QEMU 6.2.0_1: 0301a2b

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Backport the following commits from QEMU master (QEMU 7):

• qemu/qemu@ad99f64f hvf: arm: Use macros for sysreg shift/masking
• qemu/qemu@7f6c295c hvf: arm: Handle unknown ID registers as RES0

These patches are required for running the following guests:

• Linux 5.17 torvalds/linux@9e45365
• Ubuntu 21.10, kernel 5.13.0-35.40 (March 2022) https://kernel.ubuntu.com/git/ubuntu/ubuntu-impish.git/commit/?id=7936f2a576f1d7c3e1a80f8a07a217cdfa2b7338
• Ubuntu 20.04, kernel 5.4.0-103.117 (March 2022) https://kernel.ubuntu.com/git/ubuntu/ubuntu-focal.git/commit/?id=0d9955120cd5b59c6082668fd235cdf77a33a880

See https://gitlab.com/qemu-project/qemu/-/issues/899

Thanks to @fuzmish for testing: lima-vm/lima#712 (comment)

images.location	default qemu	patched qemu
impish/20220309*1	❌	✅
impish/20220204	✅	✅
impish/20220201	✅	✅
focal/20220308	❌	✅
focal/20220307	✅	✅
focal/20220302	✅	✅

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• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[scalp42]

definitely needed 🙏

[SMillerDev]

Those seem like serious problems. Is QEMU not going to release a fixed version for this?

[fuzmish]

@SMillerDev According to their wiki, the next version, v7.0, is scheduled for release in mid-April. (Note: I am not a member/contributor of QEMU.)

2022-03-15	Hard feature freeze. Tag rc0
2022-03-22	Tag rc1
2022-03-29	Tag rc2
2022-04-05	Tag rc3
2022-04-12	Release; or tag rc4 if needed
2022-04-19	Release if we needed an rc4

If the homebrew project does not encourage manual patching, it may be acceptable to provide a version based on some RC tag.

[AkihiroSuda]

If the homebrew project does not encourage manual patching, it may be acceptable to provide a version based on some RC tag.

Homebrew does not accept RC, IIUC
https://docs.brew.sh/Acceptable-Formulae#niche-or-self-submitted-stuff

[Bo98]

Given the patches will only be around for a month I'm provisionally ok with this (if another maintainer or two approves), but I'll probably open a PR rolling this and #96655 together rather than two revision bumps.

[carlocab]

Will be merged in #96655.

[carlocab]

Merged in 0301a2b.