Keith Busch e09ba90f1a swiotlb-xen: provide the "max_mapping_size" method ... commit bff2a2d453 upstream. There's a bug that when using the XEN hypervisor with bios with large multi-page bio vectors on NVMe, the kernel deadlocks [1]. The deadlocks are caused by inability to map a large bio vector - dma_map_sgtable always returns an error, this gets propagated to the block layer as BLK_STS_RESOURCE and the block layer retries the request indefinitely. XEN uses the swiotlb framework to map discontiguous pages into contiguous runs that are submitted to the PCIe device. The swiotlb framework has a limitation on the length of a mapping - this needs to be announced with the max_mapping_size method to make sure that the hardware drivers do not create larger mappings. Without max_mapping_size, the NVMe block driver would create large mappings that overrun the maximum mapping size. Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Link: https://lore.kernel.org/stable/ZTNH0qtmint%2FzLJZ@mail-itl/ [1] Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Suggested-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Acked-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/151bef41-e817-aea9-675-a35fdac4ed@redhat.com Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-12-03 07:31:24 +01:00
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events	xen/events: fix delayed eoi list handling	2023-11-28 16:56:23 +00:00
xen-pciback	xen-pciback: Consider INTx disabled when MSI/MSI-X is enabled	2023-11-20 11:08:20 +01:00
xenbus
xenfs
acpi.c
arm-device.c
balloon.c
biomerge.c
cpu_hotplug.c
dbgp.c
efi.c
evtchn.c
features.c
gntalloc.c
gntdev-common.h
gntdev-dmabuf.c
gntdev-dmabuf.h
gntdev.c
grant-table.c
Kconfig
Makefile
manage.c
mcelog.c
mem-reservation.c
pci.c
pcpu.c	ACPI: processor: Fix evaluating _PDC method when running as Xen dom0	2023-05-11 23:00:22 +09:00
platform-pci.c
privcmd-buf.c
privcmd.c
privcmd.h
pvcalls-back.c	xen/pvcalls-back: fix double frees with pvcalls_new_active_socket()	2023-05-30 13:55:32 +01:00
pvcalls-front.c
pvcalls-front.h
swiotlb-xen.c	swiotlb-xen: provide the "max_mapping_size" method	2023-12-03 07:31:24 +01:00
sys-hypervisor.c
time.c
unpopulated-alloc.c
xen-acpi-pad.c
xen-acpi-processor.c
xen-balloon.c
xen-front-pgdir-shbuf.c
xen-scsiback.c
xlate_mmu.c