Preserved FDs are the ones that share the same life-time as its holding
VmConfig instance, such as FDs for creating TAP devices.
Preserved FDs will stay open as long as the holding VmConfig instance is
valid, and will be closed when the holding VmConfig instance is destroyed.
Signed-off-by: Bo Chen <chen.bo@intel.com>
When neither serial nor console are connected to the tty,
cloud-hypervisor shouldn't touch the tty at all. One way in which
this is annoying is that if I am running cloud-hypervisor without it
using my terminal, I expect to be able to suspend it with ^Z like any
other process, but that doesn't work if it's put the terminal into raw
mode.
Instead of putting the tty into raw mode when a VM is created or
restored, do it when a serial or console device is created. Since we
now know it can't be put into raw mode until the Vm object is created,
we can move setting it back to canon mode into the drop handler for
that object, which should always be run in normal operation. We still
also put the tty into canon mode in the SIGTERM / SIGINT handler, but
check whether the tty was actually used, rather than whether stdin is
a tty. This requires passing on_tty around as an atomic boolean.
I explored more of an abstraction over the tty — having an object that
encapsulated stdout and put the tty into raw mode when initialized and
into canon mode when dropped — but it wasn't practical, mostly due to
the special requirements of the signal handler. I also investigated
whether the SIGWINCH listener process could be used here, which I
think would have worked but I'm hesitant to involve it in serial
handling as well as conosle handling.
There's no longer a check for whether the file descriptor is a tty
before setting it into canon mode — it's redundant, because if it's
not a tty it just won't respond to the ioctl.
Tested by shutting down through the API, SIGTERM, and an error
injected after setting raw mode.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
If the VM is shut down, either it's going to be started again, in
which case we still want to be in raw mode, or the process is about to
exit, in which case canon mode will be set at the end of main.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
Having PMU in guests isn't critical, and not all hardware supports
it (e.g. Apple Silicon).
CpuManager::init_pmu already has a fallback for if PMU is not
supported by the VCPU, but we weren't getting that far, because we
would always try to initialise the VCPU with KVM_ARM_VCPU_PMU_V3, and
then bail when it returned with EINVAL.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
Cloud Hypervisor's vhost-user implementation will reconnect if it gets
disconnected from the backend. That means connections happen inside
the vhost-user seccomp sandbox, so all syscalls used in reconnecting
have to be allowed in that sandbox.
clock_nanosleep is used by Glibc, and nanosleep is used by musl.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
Recently generated mshv-bindings has most of the registers
renamed. This patch renames some of the MSHV registers.
Signed-off-by: Muminul Islam <muislam@microsoft.com>
Currently we are overwriting the RUST_BACKTRACE if set
explicitly by user while running performance metrics tests
using dev_cli.sh
This change will allow user to set the RUST_BACKTRACE
while running performance metrics tests with dev_cli.sh
which invokes run_metrics.sh to run the performance binary.
We will set RUST_BACKTRACE to 1 if not set explicitly.
Signed-off-by: smit-gardhariya <gardhariya.smit@gmail.com>
Previously, we were only using it for PTYs, because for PTYs there's
no alternative. But since we have to have it for PTYs anyway, if we
also use it for TTYs, we can eliminate all of the code that handled
SIGWINCH for TTYs.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
Now that the SIGWINCH listener has fallbacks for older kernels, we
don't expect it to routinely fail, so if there's an error setting it
up, we want to know about it.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
This will allow the SIGWINCH listener to run on kernels older than
5.5, although on those kernels it will have to make 64 syscalls to
reset all the signal handlers.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
The PTY main file descriptor had to be introduced as a parameter to
start_sigwinch_listener, so that it could be closed in the child.
Really the SIGWINCH listener process should not have any file
descriptors open, except for the ones it needs to function, so let's
make it more robust by having it close all other file descriptors.
For recent kernels, we can do this very conveniently with
close_range(2), but for older kernels, we have to fall back to closing
open file descriptors one at a time.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
It seems like these examples were always intended to be doctests,
since there are lines marked with "#" so that they are excluded from
the generated documentation, but they were not recognised as doc tests
because they were not formatted correctly.
The code needed some adjustments so that it would actually compile and
run as doctests.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
When doctests are built, the crate is built with itself as a
dependency via --extern. This causes a compiler error if using a
module with the name same as the crate, because it's ambiguous whether
it's referring to the module, or the extern version of the crate, so
it's necessary to disambiguate when using the hypervisor module here.
Fixes running cargo test --doc --workspace.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
Doc comments are Markdown, and can include HTML tags. Anything in
angle brackets will therefore be inserted as an HTML tag into
rustdoc's output. If that's not intentional, the left angle bracket
needs to be escaped.
I haven't fixed the doc comments in src/main.rs, because argh doesn't
understand the escaping, so the backslashes would show up in the
--help output. I've opened https://github.com/google/argh/issues/159
about that.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
These need to be //! comments, because they apply to the module as a
whole, not to whatever directly follows the comment. Using ///
comments here resulted in documentation being attached to the wrong
thing, or not rendered at all.
I've also checked the Markdown formatting of these comments as
rendered by rustdoc, and fixed it where appropriate.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
This doesn't need to be rendered in the HTML API documentation, and
wouldn't be formatted correctly if it was.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
It was not possible to build just hypervisor with Cargo's -p flag,
because it was not properly specifying the features it requires from
vfio-ioctls.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
balloon_free_page_reporting test case should not
work as expected. The reason is that MSHV pins
all the pages during the memory map for the guest.
Those pages can not be altered without unpinning the pages.
MSHV does not support modifying the pages during the guest
life cycle. This test case can be enabled once we add
VA backed VM support.
Signed-off-by: Muminul Islam <muislam@microsoft.com>
