On Mon, 2022-02-21 at 18:02 +0100, Stefano Garzarella wrote: > On Mon, Feb 21, 2022 at 04:15:22PM +0000, David Woodhouse wrote: > > As things stand, an application which wants to use vhost with a trivial > > 1:1 mapping of its virtual address space is forced to jump through hoops > > to detect what the address range might be. The VHOST_SET_MEM_TABLE ioctl > > helpfully doesn't fail immediately; you only get a failure *later* when > > you attempt to set the backend, if the table *could* map to an address > > which is out of range, even if no out-of-range address is actually > > being referenced. > > > > Since userspace is growing workarounds for this lovely kernel API, let's > > ensure that we have a regression test that does things basically the same > > way as > > https://gitlab.com/openconnect/openconnect/-/commit/443edd9d8826 > > > > does. > > > > This is untested as I can't actually get virtio_test to work at all; it > > just seems to deadlock on a spinlock. But it's getting the right answer > > for the virtio range on x86_64 at least. > > I had a similar issue with virtio_test and this simple patch [1] should > fix the deadlock. > > [1] > https://lore.kernel.org/lkml/20220118150631.167015-1-sgarzare@xxxxxxxxxx/= Thanks. [dwoodhou@i7 virtio]$ sudo ~/virtio_test Detected virtual address range 0x1000-0x7ffffffff000 spurious wakeups: 0x0 started=0x100000 completed=0x100000 Although in some circumstances I also see a different build failure: cc -g -O2 -Werror -Wno-maybe-uninitialized -Wall -I. -I../include/ -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -include ../../include/linux/kconfig.h -c -o vringh_test.o vringh_test.c In file included from ./linux/uio.h:3, from ./linux/../../../include/linux/vringh.h:15, from ./linux/vringh.h:1, from vringh_test.c:9: ./linux/../../../include/linux/uio.h:10:10: fatal error: linux/mm_types.h: No such file or directory 10 | #include <linux/mm_types.h> | ^~~~~~~~~~~~~~~~~~ compilation terminated. make: *** [<builtin>: vringh_test.o] Error 1
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