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Replaced std::sync::atomic::spin_loop_hint as it is deprecated.

64: Added instrument feature using rftrace r=stlankes a=jbreitbart

Added `instrument` feature, which is disabled by default. It only works
if uhyve is compiled with `-Z instrument-mcount`. Furthermore I removed
the std::process::exit() call from uhyvelib so it is possible to write
the trace. The return value is not returned from `VirtualCPU::run()`.

Note that using rftrace may not be the best tool to trace uhyve as there
are various other tools available on a modern desktop OS, but can be
used to trace RustyHermit and using the same tool simplifies everything
a bit.
Co-authored-by: Jens Breitbart <jbreitbart@gmail.com>

Added `instrument` feature, which is disabled by default. It only works
if uhyve is compiled with `-Z instrument-mcount`. Furthermore I removed
the std::process::exit() call from uhyvelib so it is possible to write
the trace. The return value is not returned from `VirtualCPU::run()`.

Note that using rftrace may not be the best tool to trace uhyve as there
are various other tools available on a modern desktop OS, but can be
used to trace RustyHermit and using the same tool simplifies everything
a bit.

63: Bump goblin from 0.3.0 to 0.3.1 r=stlankes a=dependabot[bot]

Bumps [goblin](https://github.com/m4b/goblin) from 0.3.0 to 0.3.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/m4b/goblin/blob/master/CHANGELOG.md">goblin's changelog</a>.</em></p>
<blockquote>
<h2>[0.3.1] - 2021-1-18</h2>
<h3>Added</h3>
<ul>
<li>mach: add rpaths, thanks <a href="https://github.com/keith"><code>@keith</code></a>: <a href="https://github-redirect.dependabot.com/m4b/goblin/pull/248">m4b/goblin#248</a></li>
</ul>
<h3>Fixed</h3>
<ul>
<li>elf: fix regression parsing binaries like busybox (<a href="https://github-redirect.dependabot.com/m4b/bingrep/issues/28">m4b/bingrep#28</a>), thanks <a href="https://github.com/jan-auer"><code>@jan-auer</code></a>: <a href="https://github-redirect.dependabot.com/m4b/goblin/pull/249">m4b/goblin#249</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/m4b/goblin/commits">compare view</a></li>
</ul>
</details>
<br />


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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [goblin](https://github.com/m4b/goblin) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/m4b/goblin/releases)
- [Changelog](https://github.com/m4b/goblin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/m4b/goblin/commits

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Signed-off-by: dependabot[bot] <support@github.com>

60: add support for macOS Big Sur r=stlankes a=stlankes

- remove also a bug in the IO-APIC emulation
- remove some compiler warnings
Co-authored-by: Stefan Lankes <slankes@eonerc.rwth-aachen.de>
Co-authored-by: Jens Breitbart <jbreitbart@gmail.com>

CI: Fix bors.toml status name

In uhyve the Job name for checking the formatting is called "Format check (ubuntu-latest, nightly)".
This should fix bors timing out.

prevent VM exits due to the pause instructions

Improve Hugepage detection and parameters

@jschwe Do I merged the PR correctly?

Split parsing and filtering into separate functions, so that they can be tested separately.
Add tests to validate parsing functions.

This commit adds the --affinity parameter which takes a cpulist as an argument
uhyve tries to bind the vCPU threads to the physical CPUs specified.

This is an initial commit with some open issues still to be addressed

Bumps [byteorder](https://github.com/BurntSushi/byteorder) from 1.3.4 to 1.4.2.
- [Release notes](https://github.com/BurntSushi/byteorder/releases)
- [Changelog](https://github.com/BurntSushi/byteorder/blob/master/CHANGELOG.md)
- [Commits](https://github.com/BurntSushi/byteorder/compare/1.3.4...1.4.2

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Signed-off-by: dependabot[bot] <support@github.com>

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.81 to 0.2.82.
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Commits](https://github.com/rust-lang/libc/compare/0.2.81...0.2.82

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Signed-off-by: dependabot[bot] <support@github.com>

Bumps [x86](https://github.com/gz/rust-x86) from 0.34.0 to 0.35.0.
- [Release notes](https://github.com/gz/rust-x86/releases)
- [Commits](https://github.com/gz/rust-x86/compare/0.34.0...0.35.0

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Signed-off-by: dependabot[bot] <support@github.com>

Bumps [log](https://github.com/rust-lang/log) from 0.4.11 to 0.4.13.
- [Release notes](https://github.com/rust-lang/log/releases)
- [Changelog](https://github.com/rust-lang/log/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/log/compare/0.4.11...0.4.13

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Signed-off-by: dependabot[bot] <support@github.com>

I have no idea if this can be safely assumed, but
this was the situation before this PR too, so no changes there.

The parameter is the value belonging to the key passed to parse_bool function.
Renaming to make this clear.
Previously I used name because I initially copy pasted the
function signature.

Use to_ascii_lowercase to convert the value to lowercase before matching.
This simplifies the match and also catches TRUE and other variants

Fix formatting errors caused by my previous commits by running rustfmt

This commit tests if `/sys/kernel/mm/transparent_hugepage/enabled`  is present
and parses the contents.
If (transparent) hugepages are supported by the kernel, then they are
enabled by default.
If /sys/kernel/mm/transparent_hugepage/enabled is not present
the hugepages support is assumed to be not present.

I have no idea how the mac kernel works or exposes information, so a follow up commit
is probably needed to add macos support.

Simply set default to true and remove the negation.
This way hugepages are still enabled by default,
and HERMIT_HUGEPAGE=True delivers the expected result of enabling
HUGEPAGES . Previously the negation inverted the selection.

Adding --disable-hugepages previously set hugepages to true.
To prevent future errors the variable name is switched from HUGEPAGE to
DISABLE_HUGEPAGE to prevent future misunderstandings

parse_bool now additionally supports the  Strings such as "True",
"true", "False", "false", and Yes, no and interprets these as boolean options.
The existing numeric interpretation is also still available.