The snasphot/restore feature is not working because some CPU states are
not properly saved, which means they can't be restored later on.
First thing, we ensure the CPUID is stored so that it can be properly
restored later. The code is simplified and pushed down to the hypervisor
crate.
Second thing, we identify for each vCPU if the Hyper-V SynIC device is
emulated or not. In case it is, that means some specific MSRs will be
set by the guest. These MSRs must be saved in order to properly restore
the VM.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The watchdog device is created through the "--watchdog" parameter. At
most a single watchdog can be created per VM.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Before Virtio-mmio was removed, we passed an optional PCI space address
parameter to AArch64 code for generating FDT. The address is none if the
transport is MMIO.
Now Virtio-PCI is the only option, the parameter is mandatory.
Signed-off-by: Michael Zhao <michael.zhao@arm.com>
Virtio-mmio is removed, now virtio-pci is the only option for virtio
transport layer. We use MSI for PCI device interrupt. While GICv2, the
legacy interrupt controller, doesn't support MSI. So GICv2 is not very
practical for Cloud-hypervisor, we can remove it.
Signed-off-by: Michael Zhao <michael.zhao@arm.com>
When shutting down a VM using VFIO, the following error has been
detected:
vfio-ioctls/src/vfio_device.rs:312 -- Could not delete VFIO group:
KvmSetDeviceAttr(Error(9))
After some investigation, it appears the KVM device file descriptor used
for removing a VFIO group was already closed. This is coming from the
Rust sequence of Drop, from the DeviceManager all the way down to
VfioDevice.
Because the DeviceManager owns passthrough_device, which is effectively
a KVM device file descriptor, when the DeviceManager is dropped, the
passthrough_device follows, with the effect of closing the KVM device
file descriptor. Problem is, VfioDevice has not been dropped yet and it
still needs a valid KVM device file descriptor.
That's why the simple way to fix this issue coming from Rust dropping
all resources is to make Linux accountable for it by duplicating the
file descriptor. This way, even when the passthrough_device is dropped,
the KVM file descriptor is closed, but a duplicated instance is still
valid and owned by the VfioContainer.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
We turn on that emulation for Windows. Windows does not have KVM's PV
clock, so calling notify_guest_clock_paused results in an error.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
If the user specified a maximum physical bits value through the
`max_phys_bits` option from `--cpus` parameter, the guest CPUID
will be patched accordingly to ensure the guest will find the
right amount of physical bits.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
If the user provided a maximum physical bits value for the vCPUs, the
memory manager will adapt the guest physical address space accordingly
so that devices are not placed further than the specified value.
It's important to note that if the number exceed what is available on
the host, the smaller number will be picked.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
In order to let the user choose maximum address space size, this patch
introduces a new option `max_phys_bits` to the `--cpus` parameter.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The 'GuestAddress::unchecked_add' function has undefined behavior when
an overflow occurs. Its alternative 'checked_add' requires use to handle
the overflow explicitly.
Signed-off-by: Bo Chen <chen.bo@intel.com>
We are now reserving a 256M gap in the guest address space each time
when hotplugging memory with ACPI, which prevents users from hotplugging
memory to the maximum size they requested. We confirm that there is no
need to reserve this gap.
This patch removes the 'reserved gaps'. It also refactors the
'MemoryManager::start_addr' so that it is rounding-up to 128M alignment
when hotplugged memory is allowed with ACPI.
Signed-off-by: Bo Chen <chen.bo@intel.com>
We now try to create a ram region of size 0 when the requested memory
size is the same as current memory size. It results in an error of
`GuestMemoryRegion(Mmap(Os { code: 22, kind: InvalidInput, message:
"Invalid argument" }))`. This error is not meaningful to users and we
should not report it.
Signed-off-by: Bo Chen <chen.bo@intel.com>
This is a new clippy check introduced in 1.47 which requires the use of
the matches!() macro for simple match blocks that return a boolean.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The OneRegister literally means "one (arbitrary) register". Just call it
"Register" instead. There is no need to inherit KVM's naming scheme in
the hypervisor agnostic code.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Small patch creating a dedicated `block_io_uring_is_supported()`
function for the non-io_uring case, so that we can simplify the
code in the DeviceManager.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Without the unlink(2) syscall being allowed, Cloud-Hypervisor crashes
when we remove a virtio-vsock device that has been previously added.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Because of the PCI refactoring that happened in the previous commit
d793cc4da365ef960a239ff32589efc2635072bd, the ability to fully remove a
PCI device was altered.
The refactoring was correct, but the usage of a generic function to pass
the same reference for both BusDevice, PciDevice and Any + Send + Sync
causes the Arc::ptr_eq() function to behave differently than expected,
as it does not match the references later in the code. That means we
were not able to remove the device reference from the MMIO and/or PIO
buses, which was leading to some bus range overlapping error once we
were trying to add a device again to the previous range that should have
been removed.
Fixes#1802
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Run loop in hypervisor needs a callback mechanism to access resources
like guest memory, mmio, pio etc.
VmmOps trait is introduced here, which is implemented by vmm module.
While handling vcpuexits in run loop, this trait allows hypervisor
module access to the above mentioned resources via callbacks.
Signed-off-by: Praveen Paladugu <prapal@microsoft.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
A new version of vm-memory was released upstream which resulted in some
components pulling in that new version. Update the version number used
to point to the latest version but continue to use our patched version
due to the fix for #1258
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The PMEM support has an option called "discard_writes" which when true
will prevent changes to the device from hitting the backing file. This
is trying to be the equivalent of "readonly" support of the block
device.
Previously the memory of the device was marked as KVM_READONLY. This
resulted in a trap when the guest attempted to write to it resulting a
VM exit (and recently a warning). This has a very detrimental effect on
the performance so instead make "discard_writes" truly CoW by mapping
the memory as `PROT_READ | PROT_WRITE` and using `MAP_PRIVATE` to
establish the CoW mapping.
Fixes: #1795
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The virtio-balloon change the memory size is asynchronous.
VirtioBalloonConfig.actual of balloon device show current balloon size.
This commit add memory_actual_size to vm.info to show memory actual size.
Signed-off-by: Hui Zhu <teawater@antfin.com>
Write to the exit_evt EventFD which will trigger all the devices and
vCPUs to exit. This is slightly cleaner than just exiting the process as
any temporary files will be removed.
Fixes: #1242
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This patch adds the missing the `iommu` and `id` option for
`VmAddDevice` in the openApi yaml to respect the internal data structure
in the code base. Also, setting the `id` explicitly for VFIO device
hotplug is required for VFIO device unplug through openAPI calls.
Signed-off-by: Bo Chen <chen.bo@intel.com>
According to openAPI specification [1], the format for `integer` types
can be only `int32` or `int64`, unsigned and 8-bits integers are not
supported.
This patch replaces `uint64` with `int64`, `uint32` with `int32` and
`uint8` with `int32`.
[1]: https://swagger.io/specification/#data-types
Signed-off-by: Julio Montes <julio.montes@intel.com>
MsiInterruptGroup doesn't need to know the internal field names of
InterruptRoute. Introduce two helper functions to eliminate references
to irq_fd. This is done similarly to the enable and disable helper
functions.
Also drop the pub keyword from InterruptRoute fields. It is not needed
anymore.
No functional change.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
According to openAPI specification[1], the format for `integer` types
can be only `int32` or `int64`, unsigned integers are not supported.
This patch replaces `uint64` with `int64`.
[1]: https://swagger.io/specification/#data-types
Signed-off-by: Julio Montes <julio.montes@intel.com>
There is no point in manually dropping the lock for gsi_msi_routes then
instantly grabbing it again in set_gsi_routes.
Make set_gsi_routes take a reference to the routing hashmap instead.
No functional change intended.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
The MTRR feature was missing from the CPUID, which is causing the guest
to ignore the MTRR settings exposed through dedicated MSRs.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Since Cloud-Hypervisor currently support one single PCI bus, we must
reflect this through the MCFG table, as it advertises the first bus and
the last bus available. In this case both are bus 0.
This patch saves quite some time during guest kernel boot, as it
prevents from checking each bus for available devices.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The states of GIC should be part of the VM states. This commit
enables the AArch64 VM states save/restore by adding save/restore
of GIC states.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
The definition of libc::SYS_ftruncate on AArch64 is different
from that on x86_64. This commit unifies the previously hard-coded
syscall number for AArch64.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
`KVM_GET_REG_LIST` ioctl is needed in save/restore AArch64 vCPU.
Therefore we whitelist this ioctl in seccomp.
Also this commit unifies the `SYS_FTRUNCATE` syscall for x86_64
and AArch64.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
Similarly as the VM booting process, on AArch64 systems,
the vCPUs should be created before the creation of GIC. This
commit refactors the vCPU save/restore code to achieve the
above-mentioned restoring order.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
Since calling `KVM_GET_ONE_REG` before `KVM_VCPU_INIT` will
result in an error: Exec format error (os error 8). This commit
decouples the vCPU init process from `configure_vcpus`. Therefore
in the process of restoring the vCPUs, these vCPUs can be
initialized separately before started.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
The construction of `GICR_TYPER` register will need vCPU states.
Therefore this commit adds methods to extract saved vCPU states
from the cpu manager.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
Unlike x86_64, the "interrupt_controller" in the device manager
for AArch64 is only a `Gic` object that implements the
`InterruptController` to provide the interrupt delivery service.
This is not the real GIC device so that we do not need to save
its states. Also, we do not need to insert it to the device_tree.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
The value of GIC register `GICR_TYPER` is needed in restoring
the GIC states. This commit adds a field in the GIC device struct
and a method to construct its value.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
In AArch64 systems, the state of GIC device can only be
retrieved from `KVM_GET_DEVICE_ATTR` ioctl. Therefore to implement
saving/restoring the GIC states, we need to make sure that the
GIC object (either the file descriptor or the device itself) can
be extracted after the VM is started.
This commit refactors the code of GIC creation by adding a new
field `gic_device_entity` in device manager and methods to set/get
this field. The GIC object can be therefore saved in the device
manager after calling `arch::configure_system`.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
This commit adds a function which allows to save RDIST pending
tables to the guest RAM, as well as unit test case for it.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
This commit adds the unit test cases for getting/setting the GIC
distributor, redistributor and ICC registers.
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
Adds 3 more unit test cases for AArch64:
*save_restore_core_regs
*save_restore_system_regs
*get_set_mpstate
Signed-off-by: Henry Wang <Henry.Wang@arm.com>
