[FEATURE] Add DSP support to QEMU HDA driver #8
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lgirdwood
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enhancement
ymdatta
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Jun 2, 2020
Currently offloads disabled by guest via the VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET command are not preserved on VM migration. Instead all offloads reported by guest features (via VIRTIO_PCI_GUEST_FEATURES) get enabled. What happens is: first the VirtIONet::curr_guest_offloads gets restored and offloads are getting set correctly: #0 qemu_set_offload (nc=0x555556a11400, csum=1, tso4=0, tso6=0, ecn=0, ufo=0) at net/net.c:474 thesofproject#1 virtio_net_apply_guest_offloads (n=0x555557701ca0) at hw/net/virtio-net.c:720 thesofproject#2 virtio_net_post_load_device (opaque=0x555557701ca0, version_id=11) at hw/net/virtio-net.c:2334 thesofproject#3 vmstate_load_state (f=0x5555569dc010, vmsd=0x555556577c80 <vmstate_virtio_net_device>, opaque=0x555557701ca0, version_id=11) at migration/vmstate.c:168 thesofproject#4 virtio_load (vdev=0x555557701ca0, f=0x5555569dc010, version_id=11) at hw/virtio/virtio.c:2197 thesofproject#5 virtio_device_get (f=0x5555569dc010, opaque=0x555557701ca0, size=0, field=0x55555668cd00 <__compound_literal.5>) at hw/virtio/virtio.c:2036 thesofproject#6 vmstate_load_state (f=0x5555569dc010, vmsd=0x555556577ce0 <vmstate_virtio_net>, opaque=0x555557701ca0, version_id=11) at migration/vmstate.c:143 thesofproject#7 vmstate_load (f=0x5555569dc010, se=0x5555578189e0) at migration/savevm.c:829 thesofproject#8 qemu_loadvm_section_start_full (f=0x5555569dc010, mis=0x5555569eee20) at migration/savevm.c:2211 thesofproject#9 qemu_loadvm_state_main (f=0x5555569dc010, mis=0x5555569eee20) at migration/savevm.c:2395 thesofproject#10 qemu_loadvm_state (f=0x5555569dc010) at migration/savevm.c:2467 thesofproject#11 process_incoming_migration_co (opaque=0x0) at migration/migration.c:449 However later on the features are getting restored, and offloads get reset to everything supported by features: #0 qemu_set_offload (nc=0x555556a11400, csum=1, tso4=1, tso6=1, ecn=0, ufo=0) at net/net.c:474 thesofproject#1 virtio_net_apply_guest_offloads (n=0x555557701ca0) at hw/net/virtio-net.c:720 thesofproject#2 virtio_net_set_features (vdev=0x555557701ca0, features=5104441767) at hw/net/virtio-net.c:773 thesofproject#3 virtio_set_features_nocheck (vdev=0x555557701ca0, val=5104441767) at hw/virtio/virtio.c:2052 thesofproject#4 virtio_load (vdev=0x555557701ca0, f=0x5555569dc010, version_id=11) at hw/virtio/virtio.c:2220 thesofproject#5 virtio_device_get (f=0x5555569dc010, opaque=0x555557701ca0, size=0, field=0x55555668cd00 <__compound_literal.5>) at hw/virtio/virtio.c:2036 thesofproject#6 vmstate_load_state (f=0x5555569dc010, vmsd=0x555556577ce0 <vmstate_virtio_net>, opaque=0x555557701ca0, version_id=11) at migration/vmstate.c:143 thesofproject#7 vmstate_load (f=0x5555569dc010, se=0x5555578189e0) at migration/savevm.c:829 thesofproject#8 qemu_loadvm_section_start_full (f=0x5555569dc010, mis=0x5555569eee20) at migration/savevm.c:2211 thesofproject#9 qemu_loadvm_state_main (f=0x5555569dc010, mis=0x5555569eee20) at migration/savevm.c:2395 thesofproject#10 qemu_loadvm_state (f=0x5555569dc010) at migration/savevm.c:2467 thesofproject#11 process_incoming_migration_co (opaque=0x0) at migration/migration.c:449 Fix this by preserving the state in saved_guest_offloads field and pushing out offload initialization to the new post load hook. Cc: [email protected] Signed-off-by: Mikhail Sennikovsky <[email protected]> Signed-off-by: Jason Wang <[email protected]>
ymdatta
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Jun 2, 2020
Guests can crash QEMU when writting to PnP registers: $ echo 'writeb 0x800ff042 69' | qemu-system-sparc -M leon3_generic -S -bios /etc/magic -qtest stdio [I 1571938309.932255] OPENED [R +0.063474] writeb 0x800ff042 69 Segmentation fault (core dumped) (gdb) bt #0 0x0000000000000000 in () thesofproject#1 0x0000555f4bcdf0bc in memory_region_write_with_attrs_accessor (mr=0x555f4d7be8c0, addr=66, value=0x7fff07d00f08, size=1, shift=0, mask=255, attrs=...) at memory.c:503 thesofproject#2 0x0000555f4bcdf185 in access_with_adjusted_size (addr=66, value=0x7fff07d00f08, size=1, access_size_min=1, access_size_max=4, access_fn=0x555f4bcdeff4 <memory_region_write_with_attrs_accessor>, mr=0x555f4d7be8c0, attrs=...) at memory.c:539 thesofproject#3 0x0000555f4bce2243 in memory_region_dispatch_write (mr=0x555f4d7be8c0, addr=66, data=69, op=MO_8, attrs=...) at memory.c:1489 thesofproject#4 0x0000555f4bc80b20 in flatview_write_continue (fv=0x555f4d92c400, addr=2148528194, attrs=..., buf=0x7fff07d01120 "E", len=1, addr1=66, l=1, mr=0x555f4d7be8c0) at exec.c:3161 thesofproject#5 0x0000555f4bc80c65 in flatview_write (fv=0x555f4d92c400, addr=2148528194, attrs=..., buf=0x7fff07d01120 "E", len=1) at exec.c:3201 thesofproject#6 0x0000555f4bc80fb0 in address_space_write (as=0x555f4d7aa460, addr=2148528194, attrs=..., buf=0x7fff07d01120 "E", len=1) at exec.c:3291 thesofproject#7 0x0000555f4bc8101d in address_space_rw (as=0x555f4d7aa460, addr=2148528194, attrs=..., buf=0x7fff07d01120 "E", len=1, is_write=true) at exec.c:3301 thesofproject#8 0x0000555f4bcdb388 in qtest_process_command (chr=0x555f4c2ed7e0 <qtest_chr>, words=0x555f4db0c5d0) at qtest.c:432 Instead of crashing, log the access as unimplemented. Signed-off-by: Philippe Mathieu-Daudé <[email protected]> Reviewed-by: KONRAD Frederic <[email protected]> Message-Id: <[email protected]> Signed-off-by: Laurent Vivier <[email protected]>
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QEMU has a base HDA driver, but this lacks DSP support. To support it, following changes would be needed:
Note: based on initial task list from @lgirdwood
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