The currently directory handling process to open tempfile by
OpenOptions with custom_flags(O_TMPFILE) is workable for tmp
filesystem, but not workable for hugetlbfs, add new directory
handling process which works fine for both tmpfs and hugetlbfs.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
Following the refactoring of the code allowing multiple threads to
access the same instance of the guest memory, this patch goes one step
further by adding RwLock to it. This anticipates the future need for
being able to modify the content of the guest memory at runtime.
The reasons for adding regions to an existing guest memory could be:
- Add virtio-pmem and virtio-fs regions after the guest memory was
created.
- Support future hotplug of devices, memory, or anything that would
require more memory at runtime.
Because most of the time, the lock will be taken as read only, using
RwLock instead of Mutex is the right approach.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The VMM guest memory was cloned (copied) everywhere the code needed to
have ownership of it. In order to clean the code, and in anticipation
for future support of modifying this guest memory instance at runtime,
it is important that every part of the code share the same instance.
Because VirtioDevice implementations need to have access to it from
different threads, that's why Arc must be used in this case.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Latest clippy version complains about our existing code for the
following reasons:
- trait objects without an explicit `dyn` are deprecated
- `...` range patterns are deprecated
- lint `clippy::const_static_lifetime` has been renamed to
`clippy::redundant_static_lifetimes`
- unnecessary `unsafe` block
- unneeded return statement
All these issues have been fixed through this patch, and rustfmt has
been run to cleanup potential formatting errors due to those changes.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
We timestamp the VM creation time, and log the elapsed time between that
instant and the debug ioport events.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
The 0x80 IO port is typically used for BIOS debugging and testing on
bare metal x86 platforms.
We use that port and its dedicated 16 debug codes to time and track the
guest boot process.
Fixes#63
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
When the cache_size parameter from virtio-fs device is not empty, the
VMM creates a dedicated memory region where the shared files will be
memory mapped by the virtio-fs device.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
In order to support the more performant version of virtio-fs, that is
the one relying on a shared memory region between host and guest, we
introduce two new parameters to the --fs device.
The "dax" parameter allows the user to choose if he wants to use the
shared memory region with virtio-fs. By default, this parameter is "on".
The "cache_size" parameter allows the user to specify the amount of
memory that should be shared between host and guest. By default, the
value of this parameter is 8Gib as advised by virtio-fs maintainers.
Note that dax=off and cache_size are incompatible.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
One of the features of the virtio console device is its size can be
configured and updated. Our first iteration of the console device
implementation is lack of this feature. As a result, it had a
default fixed size which could not be changed. This commit implements
the console config feature and lets us change the console size from
the vmm side.
During the activation of the device, vmm reads the current terminal
size, sets the console configuration accordinly, and lets the driver
know about this configuration by sending an interrupt. Later, if
someone changes the terminal size, the vmm detects the corresponding
event, updates the configuration, and sends interrupt as before. As a
result, the console device driver, in the guest, updates the console
size.
Signed-off-by: A K M Fazla Mehrab <fazla.mehrab.akm@intel.com>
Poor performance was observed when booting kernels with "console=ttyS0"
and the serial port disabled.
This change introduces a "null" console output mode and makes it the
default for the serial console. In this case the serial port
is advertised as per other output modes but there is no input and any
output is dropped.
Fixes: #163
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The structure of the vmm-sys-util crate has changed with lots of code
moving to submodules.
This change adjusts the use of the imported structs to reference the
submodules.
Fixes: #145
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Update all dependencies with "cargo upgrade" with the exception of
vmm-sys-utils which needs some extra porting work.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The existing code taking care of the epoll loop was too restrictive as
it was propagating the error returned from the epoll_wait() syscall, no
matter what was the error. This causes the epoll loop to be broken,
leading to the VM termination.
This patch enforces the parsing of the returned error and prevent from
the error propagation in case it is EINTR, which stands for Interrupted.
In case the epoll loop is interrupted, it is appropriate to retry.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
In order to fix the clippy error complaining about the number of
arguments passed to a function exceeding the maximum of 7 arguments,
this patch factorizes those parameters into a more global one called
VmInfo.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Since virtio-pmem uses a KVM user memory region, it needs to increment
the slot index in use to prevent from any conflict with further VFIO
allocations (used for mapping mappable memory BARs).
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
We add a Reserved region type at the end of the memory hole to prevent
32-bit devices allocations to overlap with architectural address ranges
like IOAPIC, TSS or APIC ones.
Eventually we should remove that reserved range by allocating all the
architectural ranges before letting 32-bit devices use the memory hole.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
We want to be able to differentiate between memory regions that must be
managed separately from the main address space (e.g. the 32-bit memory
hole) and ones that are reserved (i.e. from which we don't want to allow
the VMM to allocate address ranges.
We are going to use a reserved memory region for restricting the 32-bit
memory hole from expanding beyond the IOAPIC and TSS addresses.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
In order to correctly support multiple VFIO devices, we need to
increment the memory slot index every time it is being used to set some
user memory region through KVM. That's why the mem_slot parameter is
made mutable.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The memory slot index provided to the DeviceManager was wrong since
only the RAM memory regions are set as user memory regions to KVM.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
KVM does not support multiple KVM VFIO devices to be created when
trying to support multiple VFIO devices. This commit creates one
global KVM VFIO device being shared with every VFIO device, which
makes possible the support for passing several devices through the
VM.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
With the VFIO crate, we can now support directly assigned PCI devices
into cloud-hypervisor guests.
We support assigning multiple host devices, through the --device command
line parameter. This parameter takes the host device sysfs path.
Fixes: #60
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Our DeviceManager::new() routine is reaching north of 250 lines.
For simplicity and readbility sake, extract all virtio devices creation
code into their own routines.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
To use the implemented virtio console device, the users can select one
of the three options ("off", "tty" or "file=/path/to/the/file") with
the command line argument "--console". By default, the console is
enabled as a device named "hvc0" (option: tty). When "off" option is
used, the console device is not added to the VM configuration at all.
Signed-off-by: A K M Fazla Mehrab <fazla.mehrab.akm@intel.com>
With this new AddressAllocator as part of the SystemAllocator, the
VMM can now decide with finer granularity where to place memory.
By allocating the RAM and the hole into the MMIO address space, we
ensure that no memory will be allocated by accident where the RAM or
where the hole is.
And by creating the new MMIO hole address space, we create a subset
of the entire MMIO address space where we can place 32 bits BARs for
example.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
GSI (Global System Interrupt) is an extension of just a linear array of
IRQs. It takes IOAPICs into account for example.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
There is alignment support for AddressAllocator but there are occations
that the alignment is known only when we call allocate(). One example
is PCI BAR which is natually aligned, means for which we have to align
the base address to its size.
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
This is only for allocating the port IO address range.
If a platform does not have PIO devices at all, the address
range will simply be unused.
So, simplify the vm-allocator data structure by making both
MMIO and PIO mandatory.
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
This patch adds the support for both IO and Memory BARs by expecting
the function allocate_bars() to identify the type of each BAR.
Based on the type, register_mapping() insert the address range on the
appropriate bus (PIO or MMIO).
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Add a "--serial" command line that takes as input either "off", "tty"
(default and current behaviour) and "file=/path/to/file".
When "--serial off" is used the serial device is not added to the VM
configuration at all.
Integration tests added that check for interrupts present (or not) and
that when sending to a file the file contains the expected serial
output.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Now that cloud-hypervisor VMM supports virtio-pmem, it can directly
boot a VM from an image exposed as a persistent memory block device.
That's why there is no need to force the --disk option as being
mandatory.
Fixes#90
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Until now, the VMM was only accepting a single instance of virtio-net
device. This commit extends the virtio-net support by allowing several
devices to be created for a single VM.
Fixes#71
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
For every parameter dealing with a size as option, such as memory or
virtio-pmem, the CLI can now parse sizes with the suffixes K, M or G.
Fixes#70
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
PciConfigIo is a legacy pci bus dispatcher, which manages all pci
devices including a pci root bridge. However, it is unnecessary to
design a complex hierarchy which redirects every access by PciRoot.
Since pci root bridge is also a pci device instance, and only contains
easy config space read/write, and PciConfigIo actually acts as a pci bus
to dispatch resource based resolving when VMExit, we re-arrange to make
the pci hierarchy clean.
Signed-off-by: Jing Liu <jing2.liu@linux.intel.com>
Until now, the VMM was only accepting a single instance of virtio-pmem
device. This commit extend the virtio-pmem support by allowing several
devices to be created for a single VM.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This patch plumbs the virtio-pmem device to the VMM. By adding a new
command line option "--pmem", we can now expose some persistent memory
to the guest OS, backed by the provided source.
The point of having such support in cloud-hypervisor is to be able to
share some memory between the host and the guest as DAXable.
One interesting use case is to boot directly from an image passed
through virtio-pmem, instead of going through virtio-blk. This can
allow good performances while avoiding the guest cache, which would
prevent the VM memory footprint from growing too much.
Fixes#68
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Until now, the VMM was only accepting a single instance of a virtio-fs
device. This commit extend the virtio-fs support by allowing several
devices to be created for a single VM.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
In the context of vhost-user, we need the guest RAM to be backed by
a file in order to be accessed by an external process. This patch
adds the new flag "file=" to the "--memory" option so that we can
specify from the command line if the memory needs to be backed, and
by which specific file.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The user can now share some files and directories with the guest by
providing the corresponding vhost-user socket. The virtiofsd daemon
should be started by the user before to start the VM.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
BusDevice includes two methods which are only for PCI devices, which should
be as members of PciDevice trait for a better clean high level APIs.
Signed-off-by: Jing Liu <jing2.liu@linux.intel.com>
The previous commit introduced a userspace implementation of an IOAPIC
and this commits aims to plumb it into the cloud-hypervisor VMM.
Here is the list of new things brought by this patch:
- Update the rust-vmm/kvm-ioctls dependency to benefit from latest
patches including the support for split irqchip, and the vector
being returned when a VM exit is caused by an EOI.
- Enable the split irqchip (which means no IOAPIC or PIC is emulated
in kernel). This is done conditionally based on the support of the
TSC_DEADLINE_TIMER from both KVM and the underlying CPU. The
dependency on TSC_DEADLINE_TIMER is related to KVM which does not
support creating the in kernel PIT if it has a split irqchip.
- Rely on callbacks to handle the following use cases:
- in kernel IOAPIC + serial IRQ (pin based)
- in kernel IOAPIC + virtio-pci MSI-X
- in kernel IOAPIC + virtio-pci IRQ (pin based)
- userspace IOAPIC + serial IRQ (pin based)
- userspace IOAPIC + virtio-pci MSI-X
- userspace IOAPIC + virtio-pci IRQ (pin based)
Fixes#13
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit anticipate the future need from having support for both
in kernel and userspace IOAPIC. The way to signal an interrupt from
the serial device will vary depending on the use case, but this should
be independent from the serial implementation itself.
That's why this patch provides a generic trait for the serial device
to call from, so that it can trigger interrupts independently from the
IOAPIC type chosen (in kernel vs userspace).
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
VMM may load different format kernel image to start guest, we currently
only have elf loader support, so add bzimage loader support in case
that VMM would like to load bzimage.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
As more CPUID handling and CpuidPatch common code being added, it's
reasonable to move all the common code to the same place and in the
future we may consider move it to individual file when neccesary.
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
