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2021-06-01fixes for VFIO_USER_DIRTY_PAGES (#537)John Levon4-63/+87
- we should only accept one range, not multiple ones - clearly define and implement argsz behaviour - we need to check if migration is configured - add proper test coverage; move existing testing to python Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-28don't return non-zero caps for zero-sized regions (#543)Thanos Makatos1-3/+5
Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com>
2021-05-28hide non-ABI symbols (#538)John Levon6-28/+29
Default to hidden visibility to remove non-public symbols from API users (and improve performance a little). Every public function gets an EXPORT annotation. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-28restore argsz for DMA map/unmap (#523)Thanos Makatos2-41/+70
use DMA map/unmap format similar to VFIO's Using a DMA map/unmap format similar to VFIO's (vfio_iommu_type1_dma_map / vfio_iommu_type1_dma_unmap) makes it easier to adapt to future changes. Consequently we also honor the passed argsz. Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com> Reviewed-by: John Levon <john.levon@nutanitx.com>
2021-05-26support VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP (#521)Thanos Makatos1-5/+32
Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com>
2021-05-26remove a stale FIXME (#527)John Levon1-4/+0
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-26improve request header handlingJohn Levon4-24/+28
We should require a non-empty payload for every command type except VFIO_USER_DEVICE_RESET. We should also reply to the caller with such failures. Add some testing for is_valid_header(), and move the fd handling test over to it too. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-26don't support multiple DMA regions per map/unmap (#520)Thanos Makatos2-68/+85
We're dropping this behavior from the spec. Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com>
2021-05-25don't treat DMA segment as absolute when determining dirty page bit (#519)Thanos Makatos1-28/+2
New DMA regions don't get their pages tracked if dirty page logging has already been started, this patch fixes this bug. Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com>
2021-05-25log dirty pages for new DMA regions as well (#518)Thanos Makatos1-26/+48
New DMA regions don't get their pages tracked if dirty page logging has already been started, this patch fixes this bug. Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com>
2021-05-25more spec updates (#491)John Levon3-18/+16
update spec to v0.9.1 Changes include: - reply message includes the command number - split out message definitions into request/reply sections, and skip the repeated standard header definitions - lots of markup fixes - re-organization for clarity - further documentation of argsz - remove VFIO_USER_VM_INTERRUPT until we have a working implementation - dirty page tracking is optional - fix implementations to match the spec Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-25add a gcov target (#498)John Levon1-19/+8
"make gcov" is sufficient to run the tests in DEBUG mode and generate gcov output for each .c file in lib/, to give us some idea of our coverage. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-05-25Handle support of PCI FLR capability (#517)Swapnil Ingle1-2/+10
* Handle support of PCI FLR capability If device supports FLR cap then call vfu_reset_cb_t when FLR is initiated by client. Signed-off-by: Swapnil Ingle <swapnil.ingle@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-24python tests: add VFIO_USER_DEVICE_SET_IRQS (#473)John Levon1-14/+18
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-24fix region offset handling (#485)John Levon2-16/+6
The specification states that the region offset given in the region info should be used as the "offset" when mmap()ing the region from the client side. However, the library instead implemented a fixed offset scheme similar to that of vfio - and no clients actually set up the file like that. Instead, let servers define their own offsets, and pass them through to clients as is. It's up to the server to decide how its backing file or files is organized. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-20migration: various dirty page tracking fixes (#457)Thanos Makatos6-83/+190
- document how to use a vfio-user device with libvirt - document how to use SPDK's nvmf/vfio-user target with libvirt - replace vfio_bitmap with vfio_user_bitmap and vfio_iommu_type1_dirty_bitmap_get with vfio_user_bitmap_range - fix bug for calculating number of pages needed for dirty page bitmap - align number of bytes for dirty page bitmap to QWORD - add debug messages around dirty page tracking - only support flags=0 when doing DMA unmap - set device state to running after reset - allow region read/write even if device is in stopped state - allow transitioning from stopped/stop-and-copy state to running state - fix unit tests Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com>
2021-05-20python tests: add VFIO_USER_DEVICE_GET_REGION_INFO (#471)John Levon1-1/+1
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-20validate_irq_subindex: skip check of vfu_ctx pointer (#499)John Levon1-4/+2
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-05-15python tests: add VFIO_USER_DEVICE_GET_INFO (#454)John Levon2-4/+1
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-15move PCI capability testing to Python (#453)John Levon1-0/+3
This also adds a couple of additional tests (as well as more fully testing the region access path). Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-05-14Fix dma read write count (#497)Swapnil Ingle1-2/+2
* spec: Fixed DMA_READ/WRITE data count DMA region size is maxed to uint64_t. Updated DMA_READ/WRITE data count to be defined as uint64_t. * Fix vfu_dma_read/write() as per spec changes Signed-off-by: Swapnil Ingle <swapnil.ingle@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com>
2021-05-14dma: Use correct len type (#479)Swapnil Ingle2-6/+8
* dma: Use correct len type vfio_iommu_type1_dirty_bitmap_get.size is of type __u64 dma_controller_dirty_page_get() receives it as int, instead it should be u64 Also added UT to test overflow of length passed to dma_controller_dirty_page_get Fixes: #477 Signed-off-by: Swapnil Ingle <swapnil.ingle@nutanix.com> Reviewed-by: John Levon <john.levon@nutanix.com>
2021-05-11some specification updates (#465)John Levon3-9/+9
Make a few specification updates after review by Stefan Hajnoczi. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-10fix dma unregister callback during region removal (#464)John Levon3-12/+22
There are two issues with the unregister callback: - we were requiring the callback to be set when removing a region, but it's only required if a consumer wants to map regions - when we removed all regions (for example, on a reset), we weren't triggering the callback Signed-off-by: John Levon <john.levon@nutanix.com> swapnil code review add assert Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-05-07don't close outgoing message fds (#472)John Levon1-6/+0
We made a silly mistake in free_msg(): the file descriptors we send out in message replies should never be closed. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-05-04stop using struct vfio_device_info (#456)John Levon1-2/+2
This struct from vfio.h has grown larger in newer Linux versions; this breaks older clients, as now the server would require the larger size. Replace with our own definition. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-05-04refactor message handling path (#376)John Levon5-480/+455
Capture message handling inside a new vfu_msg_t private structure and pass that around to the handlers. This provides no functional change, but greatly simplifies and cleans up that path, especially around fd and iovec handling. As part of fixing up the unit tests, start using global variables to reduce the amount of boiler-plate. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-23correct PM capability definition (#452)John Levon1-1/+14
the static size assert for the PMCS register was checking the wrong struct; however, the struct was nonetheless 4 bytes long, due to uint bitfields. This accidentally meant the containing struct pmcap was the correct size (the alignment attribute makes no difference). After fixing struct pmcs, we'll include the additional two bytes defined in the PCI PM specification, Section 3.2. These are "optional", but as elsewhere, we'll require them when adding the capability. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-23handle_region_access(): fix error-path log message (#451)John Levon1-2/+2
This was an error handling message that was missed when converting from -errno to -1 return style. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-04-23cap_write_pm(): remove assert() (#450)John Levon1-2/+2
Replace client-triggerable assert() with a log message. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-04-23reduce VFU_MAX_CAPS (#449)John Levon1-3/+3
Our current value of VFU_MAX_CAPS leads to a vfu_ctx_t that is way too large. Reduce the value such that the vfu_ctx_t is under 8KB. Fixes #446. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-04-19vfu_realize_ctx(): fix default PCI config space region (#445)John Levon1-7/+5
Fix check for an un-configured PCI config space region (the previous method was not accounting for the initialized ->fd). Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-15remove stale comment (#443)John Levon1-2/+0
Missed this FIXME when removing use of __u* types previously. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-04-15remove vfu_get_region_info() (#444)John Levon3-14/+3
This is only used internally, and not really useful. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-04-15vfu_ctx_create(): validate flags argument (#442)John Levon1-2/+4
In addition, return ENOTSUP for unknown device types, and add some unit tests. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-14libvfio-user.c: use ERROR_INT() (#433)John Levon3-107/+101
Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-14hard-code migration region index (#441)John Levon2-18/+10
Now we are confident we are OK with a hard-coded VFU_PCI_DEV_MIGR_REGION_IDX value, there's no need for us to track .migr_reg any more, either in the client or internally. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-14migration: use ERROR_INT() (#432)John Levon3-30/+30
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-13tran_sock: use ERROR_INT() (#431)John Levon3-90/+100
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-13pci: use ERROR_INT() (#430)John Levon3-29/+34
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-13drop use of __u* types (#438)John Levon4-21/+18
As we are now pure userspace, there is no need for us to use non-standard integer types. This leaves the copied defines from Linux's vfio.h alone, however. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-13irq.c: use ERROR_INT() (#429)John Levon2-8/+12
Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-13dma: use ERROR_INT()John Levon7-58/+64
The first in a series excising the use of the "return -errno" idiom. This is a non-standard usage, and in userspace, we have "errno" for delivering side-band error values. As there have been multiple bugs from not using standard error return methods like -1+errno or NULL+errno, let's do that. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-13correct DMA region add/remove returns (#427)John Levon2-16/+18
Code was expecting -errno style returns, but the DMA code didn't do this. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-08tran_sock: remove umask() (#435)John Levon1-6/+0
It's not our business to be setting umasks, and it's not necessary. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
2021-04-07clean up newlines in logs (#423)John Levon5-76/+75
vfu_log() and err() should not take newlines. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-07mark vfu_log() with format attribute (#426)John Levon6-21/+22
Fix up all resulting fallout. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-06call reset callback on losing client connection (#419)John Levon1-3/+5
Give API users an opportunity to clean up when a client disconnects from the vfio-user socket. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-06vfu_reset_ctx(): tear down DMA and IRQs (#418)John Levon5-1/+36
When we lose the client connection, the IRQ and DMA region state is no longer valid; clean them up. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
2021-04-06tran_sock_send_iovec(): check for full write (#416)John Levon1-1/+7
Report -ECONNRESET to the caller if we failed to write the full expected message. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
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