As per this kernel documentation:
For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_PAPR, KVM_EXIT_XEN,
KVM_EXIT_EPR, KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR the corresponding
operations are complete (and guest state is consistent) only after userspace
has re-entered the kernel with KVM_RUN. The kernel side will first finish
incomplete operations and then check for pending signals.
The pending state of the operation is not preserved in state which is
visible to userspace, thus userspace should ensure that the operation is
completed before performing a live migration. Userspace can re-enter the
guest with an unmasked signal pending or with the immediate_exit field set
to complete pending operations without allowing any further instructions
to be executed.
Since we capture the state as part of the pause and override it as part
of the resume we must ensure the state is consistent otherwise we will
lose the results of the MMIO or PIO operation that caused the exit from
which we paused.
Fixes: #3658
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Extending the Vm trait with set_identity_map_address() in order to
expose this ioctl to the VMM.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Place the 3 page TSS at an explicit location in the 32-bit address space
to avoid conflicting with the loaded raw firmware.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
In particular update for the vmm-sys-util upgrade and all the other
dependent packages. This requires an updated forked version of
kvm-bindings (due to updated vfio-ioctls) but allowed the removal of our
forked version of kvm-ioctls.
The changes to the API from kvm-ioctls and vmm-sys-util required some
other minor changes to the code.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Currently these two macros(msr, msr_data) reside both on kvm and mshv
module. Definition is same for both module. Moving them to arch/x86
module eliminates redundancy and makes more sense.
Signed-off-by: Muminul Islam <muislam@microsoft.com>
In order to validate emulated memory accesses, we need to be able to get
all the segments descriptor attributes.
This is done by abstracting the SegmentRegister attributes through a
trait that each hypervisor will have to implement.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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 support for SGX is exposed to the guest through CPUID 0x12. KVM
passes static subleaves 0 and 1 from the host to the guest, without
needing any modification from the VMM itself.
But SGX also relies on dynamic subleaves 2 through N, used for
describing each EPC section. This is not handled by KVM, which means
the VMM is in charge of setting each subleaf starting from index 2
up to index N, depending on the number of EPC sections.
These subleaves 2 through N are not listed as part of the supported
CPUID entries from KVM. But it's important to set them as long as index
0 and 1 are present and indicate that SGX is supported.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Add a new function to the hypervisor trait so that the caller can
retrieve the list of MSRs supported by this hypervisor.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Initially the licensing was just Apache-2.0. This patch changes
the licensing to dual license Apache-2.0 OR BSD-3-Clause
Signed-off-by: Muminul Islam <muislam@microsoft.com>
Implement the vCPU state getter and setter separately from the initial
KVM Hypervisor trait implementation, mostly for readability purposes.
Signed-off-by: Muminul Islam <muislam@microsoft.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
For each of the traits we are defining kvm related structures
and add the trait implementation to the structs. For more information
please see the kvm-ioctls and kvm-bindings crate.
This is a standalone implementation that does not include the switch of
the Cloud-Hypervisor vmm and arch crates to it.
Signed-off-by: Muminul Islam <muislam@microsoft.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This Vcpu trait should be implemented by each underlying hypervisor.
Previously created hypervisor object should create the VM based on
already selected hypervisor and Vm object should create this vcpu
object based on same hyperviosr. Each of this object should be
referenced by trait object i.e <dyn Vcpu>.
Signed-off-by: Muminul Islam <muislam@microsoft.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
