Rob Bradford 507912385a vmm: Ensure that PIO and MMIO exits complete before pausing ... 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>		2022-02-07 15:26:22 +00:00
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src	vmm: Ensure that PIO and MMIO exits complete before pausing	2022-02-07 15:26:22 +00:00
Cargo.toml	vfio-ioctls: Move away from archived crate rust-vmm/vfio-ioctls	2022-02-04 13:57:46 +01:00