Re: [Xen-devel] [xen-unstable test] 144091: regressions - FAIL

[Jan Beulich <jbeulich@xxxxxxxx>]

On 14.11.2019 16:52, osstest service owner wrote:
> flight 144091 xen-unstable real [real]
> http://logs.test-lab.xenproject.org/osstest/logs/144091/
> 
> Regressions :-(
> 
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-amd64-i386-xl-qemuu-dmrestrict-amd64-dmrestrict 12 
> guest-start/debianhvm.repeat fail REGR. vs. 144042
>  test-amd64-amd64-qemuu-nested-intel 17 debian-hvm-install/l1/l2 fail REGR. 
> vs. 144042

I've taken another look, and I now think the L2 guest doesn't even
make it to the bootloader. Taking together

(d1) SeaBIOS (version rel-1.12.1-0-ga5cab58-Xen)
(d1) BUILD: gcc: (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 binutils: (GNU 
Binutils for Debian) 2.28
(d1) 
(d1) Found Xen hypervisor signature at 40000000
(d1) Running on QEMU (i440fx)
(d1) xen: copy e820...
(d1) Relocating init from 0x000d7c20 to 0x2f7abd80 (size 82400)

and

(XEN) *********** VMCS Areas **************
(XEN) 
(XEN) >>> Domain 1 <<<
(XEN)   VCPU 0
(XEN) *** Guest State ***
(XEN) CR0: actual=0x0000000000000031, shadow=0x0000000000000011, 
gh_mask=ffffffffffffffff
(XEN) CR4: actual=0x0000000000002050, shadow=0x0000000000000000, 
gh_mask=fffffffffff8f870
(XEN) CR3 = 0x0000000000400000
(XEN) RSP = 0x0000000000006fa4 (0x0000000000006fa4)  RIP = 0x000000002f7ba9f4 
(0x000000002f7ba9f4)

and similarly in the L0 log

(XEN) RSP = 0x0000000000006fa4 (0x0000000000006fa4)  RIP = 0x000000002f7ba9f4 
(0x000000002f7ba9f4)

I instead think it's still in SeaBIOS code. I'll see if I can
derive where exactly it's sitting. In any event the most recent
exit reason to L0 was EPT_VIOLATION with a qualification of 0x19c
(fetch, eff_read, eff_write, gla_valid, gla_fault), which I don't
think would allow the guest to continue without an adjustment to
its EPT permissions.

Jan

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