Pierre-Clément Tosi 869e16cdeb vfio_platform: Map device MMIO before booting pVMs ... When memory is protected, the guest address space mapped to physical memory shouldn't be modified dynamically after the guest has started running so force CrosVM to map the device MMIO regions before that. Otherwise, the protected VM firmware will fail to validate the assigned regions (as they haven't actually been assigned yet), aborting the boot of the pVM. Note that we can't simply call device.regions_mmap() at this point because the crosvm internal IPC (in particular vm_memory_handler_thread) isn't set-up yet so this commit had to duplicate the mmap() logic to be available in the main thread. This change was verified using strace, going from ioctl(7, KVM_CREATE_VM, 0x80000028) = 9 [...] ioctl(36, VFIO_SET_IOMMU, 0xb) = 0 ioctl(9, KVM_CREATE_DEVICE, {type=KVM_DEV_TYPE_VFIO, flags=0}) = 0 ioctl(43, KVM_SET_DEVICE_ATTR, {flags=0, group=1, attr=1, addr=0x7fdd3a4a60}) = 0 ioctl(42, VFIO_GROUP_GET_DEVICE_FD, 0xb400007cc3d0eb90) = 60 ioctl(60, VFIO_DEVICE_GET_INFO, 0x7fdd3a3cd0) = 0 ioctl(60, VFIO_DEVICE_GET_REGION_INFO, 0x7fdd3a3570) = 0 [...] [pid 4279] ioctl(5, KVM_RUN <unfinished ...> [...] [pid 4279] ioctl(5, KVM_RUN, 0) = 0 [pid 4281] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 369, 0) = 0x7d5b3fb000 [pid 4281] ioctl(239, KVM_SET_USER_MEMORY_REGION, {slot=2, flags=0, guest_phys_addr=0x90000000, memory_size=4096, userspace_addr=0x7d5b3fb000}) = 0 to ioctl(7, KVM_CREATE_VM, 0x80000028) = 9 [...] ioctl(36, VFIO_SET_IOMMU, 0xb) = 0 ioctl(9, KVM_CREATE_DEVICE, {type=KVM_DEV_TYPE_VFIO, flags=0}) = 0 ioctl(43, KVM_SET_DEVICE_ATTR, {flags=0, group=1, attr=1, addr=0x7fd1c1e030}) = 0 ioctl(42, VFIO_GROUP_GET_DEVICE_FD, 0xb4000077a0628b70) = 60 ioctl(60, VFIO_DEVICE_GET_INFO, 0x7fd1c1d2a0) = 0 ioctl(60, VFIO_DEVICE_GET_REGION_INFO, 0x7fd1c1cb40) = 0 [...] mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 189, 0) = 0x7917dbc000 ioctl(9, KVM_SET_USER_MEMORY_REGION, {slot=2, flags=0, guest_phys_addr=0x90000000, memory_size=4096, userspace_addr=0x7917dbc000}) = 0 [...] [pid 4233] ioctl(5, KVM_RUN <unfinished ...> BUG=b:308642771 TEST=Manual run with a pKVM-VFIO device assigned Change-Id: Iad3494c4e9c309f99fc5cab37ed913d484fc5150 Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5029655 Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Pierre-Clément Tosi <ptosi@google.com>		2023-11-17 12:04:03 +00:00
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src	vfio_platform: Map device MMIO before booting pVMs	2023-11-17 12:04:03 +00:00
.build_test_skip
Cargo.toml