Re: [kvm-unit-tests PATCH v5 0/8] Multi-migration support
On 26/02/2024 09.10, Nicholas Piggin wrote: On Fri Feb 23, 2024 at 5:06 PM AEST, Thomas Huth wrote: On 21/02/2024 04.27, Nicholas Piggin wrote: Now that strange arm64 hang is found to be QEMU bug, I'll repost. Since arm64 requires Thomas's uart patch and it is worse affected by the QEMU bug, I will just not build it on arm. The QEMU bug still affects powerpc (and presumably s390x) but it's not causing so much trouble for this test case. I have another test case that can hit it reliably and doesn't cause crashes but that takes some harness and common lib work so I'll send that another time. Since v4: - Don't build selftest-migration on arm. - Reduce selftest-migration iterations from 100 to 30 to make the test run faster (it's ~0.5s per migration). Thanks, I think the series is ready to go now ... we just have to wait for your QEMU TCG migration fix to get merged first. Or should we maybe mark the selftest-migration with "accel = kvm" for now and remove that line later once QEMU has been fixed? Could we merge it? I'm juggling a bunch of different things and prone to lose track of something :\ I'll need to drum up a bit of interest to review the QEMU fixes from those who know the code too, so that may take some time. Ok, I merged it, but with "accel = kvm" for the time being (otherwise this would be quite a pitfall for people trying to run the k-u-t with TCG when they don't know that they have to fetch a patch from the mailing list to get it working). I left it out of arm unittests.cfg entirely, and s390 and powerpc seems to work by luck enough to be useful for gitlab CI so I don't think there is a chnage needed really unless you're paranoid. At least the s390x test does not work reliably at all when running with TCG without your QEMU patch, so I think we really need the "accel = kvm" for the time being here. I do have a later patch that adds a memory tester that does trigger it right away on powerpc. I'll send that out after this series is merged... but we do still have the issue that the gitlab CI image has the old QEMU don't we? Until we update distro. We only run selected tests in the gitlab-CI, so unless you add it to .gitlab-ci.yml, the selftest-migration test won't be run there. Thomas
Re: [kvm-unit-tests PATCH v5 0/8] Multi-migration support
On Fri Feb 23, 2024 at 5:06 PM AEST, Thomas Huth wrote: > On 21/02/2024 04.27, Nicholas Piggin wrote: > > Now that strange arm64 hang is found to be QEMU bug, I'll repost. > > Since arm64 requires Thomas's uart patch and it is worse affected > > by the QEMU bug, I will just not build it on arm. The QEMU bug > > still affects powerpc (and presumably s390x) but it's not causing > > so much trouble for this test case. > > > > I have another test case that can hit it reliably and doesn't > > cause crashes but that takes some harness and common lib work so > > I'll send that another time. > > > > Since v4: > > - Don't build selftest-migration on arm. > > - Reduce selftest-migration iterations from 100 to 30 to make the > >test run faster (it's ~0.5s per migration). > > Thanks, I think the series is ready to go now ... we just have to wait for > your QEMU TCG migration fix to get merged first. Or should we maybe mark the > selftest-migration with "accel = kvm" for now and remove that line later > once QEMU has been fixed? Could we merge it? I'm juggling a bunch of different things and prone to lose track of something :\ I'll need to drum up a bit of interest to review the QEMU fixes from those who know the code too, so that may take some time. I left it out of arm unittests.cfg entirely, and s390 and powerpc seems to work by luck enough to be useful for gitlab CI so I don't think there is a chnage needed really unless you're paranoid. I do have a later patch that adds a memory tester that does trigger it right away on powerpc. I'll send that out after this series is merged... but we do still have the issue that the gitlab CI image has the old QEMU don't we? Until we update distro. Thanks, Nick
Re: [kvm-unit-tests PATCH v5 0/8] Multi-migration support
On 21/02/2024 04.27, Nicholas Piggin wrote: Now that strange arm64 hang is found to be QEMU bug, I'll repost. Since arm64 requires Thomas's uart patch and it is worse affected by the QEMU bug, I will just not build it on arm. The QEMU bug still affects powerpc (and presumably s390x) but it's not causing so much trouble for this test case. I have another test case that can hit it reliably and doesn't cause crashes but that takes some harness and common lib work so I'll send that another time. Since v4: - Don't build selftest-migration on arm. - Reduce selftest-migration iterations from 100 to 30 to make the test run faster (it's ~0.5s per migration). Thanks, I think the series is ready to go now ... we just have to wait for your QEMU TCG migration fix to get merged first. Or should we maybe mark the selftest-migration with "accel = kvm" for now and remove that line later once QEMU has been fixed? Thomas
[kvm-unit-tests PATCH v5 0/8] Multi-migration support
Now that strange arm64 hang is found to be QEMU bug, I'll repost. Since arm64 requires Thomas's uart patch and it is worse affected by the QEMU bug, I will just not build it on arm. The QEMU bug still affects powerpc (and presumably s390x) but it's not causing so much trouble for this test case. I have another test case that can hit it reliably and doesn't cause crashes but that takes some harness and common lib work so I'll send that another time. Since v4: - Don't build selftest-migration on arm. - Reduce selftest-migration iterations from 100 to 30 to make the test run faster (it's ~0.5s per migration). Since v3: - Addressed Thomas's review comments: - Patch 2 initrd cleanup unset the old variable in the correct place. - Patch 4 multi migration removed the extra wait for "Now migrate the VM" message, and updated comments around it. - Patch 6 fix typo and whitespace in quiet migration support. - Patch 8 fix typo and whitespace in migration selftest. Since v2: - Rebase on riscv port and auxvinfo fix was merged. - Clean up initrd cleanup moves more commands into the new cleanup function from the trap handler comands (suggested by Thomas). - "arch-run: Clean up temporary files properly" patch is now renamed to "arch-run: Fix TRAP handler..." - Fix TRAP handler patch has redone changelog to be more precise about the problem and including recipe to recreate it. - Fix TRAP handler patch reworked slightly to remove the theoretical race rather than just adding a comment about it. - Patch 3 was missing a couple of fixes that leaked into patch 4, those are moved into patch 3. Thanks, Nick Nicholas Piggin (8): arch-run: Fix TRAP handler recursion to remove temporary files properly arch-run: Clean up initrd cleanup migration: use a more robust way to wait for background job migration: Support multiple migrations arch-run: rename migration variables migration: Add quiet migration support Add common/ directory for architecture-independent tests migration: add a migration selftest arm/sieve.c | 2 +- common/selftest-migration.c | 29 ++ common/sieve.c | 51 ++ lib/migrate.c| 19 +++- lib/migrate.h| 2 + powerpc/Makefile.common | 1 + powerpc/selftest-migration.c | 1 + powerpc/unittests.cfg| 4 + riscv/sieve.c| 2 +- s390x/Makefile | 1 + s390x/selftest-migration.c | 1 + s390x/sieve.c| 2 +- s390x/unittests.cfg | 4 + scripts/arch-run.bash| 177 +-- x86/sieve.c | 52 +- 15 files changed, 240 insertions(+), 108 deletions(-) create mode 100644 common/selftest-migration.c create mode 100644 common/sieve.c create mode 12 powerpc/selftest-migration.c create mode 12 s390x/selftest-migration.c mode change 100644 => 12 x86/sieve.c -- 2.42.0
