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Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generatio
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature |
Date: |
Wed, 12 Jul 2017 03:42:03 +0300 |
On Tue, Jul 11, 2017 at 04:43:50PM -0700, Ben Warren wrote:
> Hi Laszlo,
>
>
> On Jul 11, 2017, at 3:13 PM, Laszlo Ersek <address@hidden> wrote:
>
> On 07/11/17 22:42, Peter Maydell wrote:
>
> On 11 July 2017 at 20:10, Michael S. Tsirkin <address@hidden> wrote:
>
> On Tue, Jul 11, 2017 at 05:49:07PM +0100, Peter Maydell wrote:
>
> The good news is it's not aarch64-specific. I just hit this on
> a build on x86_64 host, gcc, debug build:
>
> GTESTER check-qtest-x86_64
> **
> ERROR:/home/petmay01/linaro/qemu-for-merges/tests/
> vmgenid-test.c:65:acpi_find_vgia:
> assertion failed (ACPI_ASSERT_CMP_str == "RSDT"): ("" ==
> "RSDT")
> GTester: last random seed:
> R02S9eefaf38297e67e4f67d5db77989350e
> /home/petmay01/linaro/qemu-for-merges/tests/
> Makefile.include:826:
> recipe for target 'check-qtest-x86_64' failed
>
>
> Couldn't reproduce here. I suspect VM didn't start at all.
> Am I right to assume this is without KVM?
>
>
> On aarch64 host, definitely without KVM. On x86-64 host,
> I think it is without KVM but am not totally sure.
>
> It may be one of those cases that only triggers if the
> host is heavily loaded at the time the test is running.
>
>
> (I apologize if the root cause is obvious at this point -- I'm unclear
> if the discussion is now about understanding the failure, or about ways
> to mitigate it. I'm assuming the former.)
>
> This test can occasionally fail because the test case has to wait until
> the guest firmware proceeds far enough with executing the ACPI
> linker/loader script. See RSDP_SLEEP_US and RSDP_TRIES_MAX in
> acpi_find_vgia(). If the test case pokes at guest RAM "too early", using
> monitor commands, then the guest fw will not have yet shaped guest RAM
> as required.
>
>
> Yes, it’s definitely a setup time problem. With the values that are checked
> in, I can’t get it to fail on my setup, but if I wind the numbers down I see
> the same failure as Peter. So now we have the ages-old problem of “what new
> arbitrary value should I use that will not cause false failures but will
> eventually time out”. Can you think of an easy way to tell if firmware is
> running so we can make this more state-driven instead of time-dependent?
>
>
>
> (Again, apologies if this has been obvious all along.)
>
> Thanks
> Laszlo
>
I suspect the issue is that io thread runs while CPU thread does not.
How about retrieving the clock id of the VCPU thread
with pthread_getcpuclockid, then getting the time with clock_gettime?
Then keep the current limit but make sure it elapsed in
the VCPU thread.
--
MST
- [Qemu-devel] [PULL 21/21] i386/acpi: update expected acpi files, (continued)
- [Qemu-devel] [PULL 21/21] i386/acpi: update expected acpi files, Michael S. Tsirkin, 2017/07/03
- [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Michael S. Tsirkin, 2017/07/03
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Peter Maydell, 2017/07/11
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Ben Warren, 2017/07/11
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Peter Maydell, 2017/07/11
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Peter Maydell, 2017/07/11
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Michael S. Tsirkin, 2017/07/11
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Peter Maydell, 2017/07/11
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Laszlo Ersek, 2017/07/11
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Ben Warren, 2017/07/11
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Peter Maydell, 2017/07/13
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Laszlo Ersek, 2017/07/13
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Marc-André Lureau, 2017/07/13
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Ben Warren, 2017/07/13
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Michael S. Tsirkin, 2017/07/13
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Peter Maydell, 2017/07/14
- Re: [Qemu-devel] [PULL 19/21] tests: Add unit tests for the VM Generation ID feature, Michael S. Tsirkin, 2017/07/14
Re: [Qemu-devel] [PULL 00/21] pc, acpi, pci, virtio: fixes, cleanups, features, tests, Peter Maydell, 2017/07/04