On 12/5/23 23:52, Guenter Roeck wrote:
Hi Helge,
On 12/5/23 13:58, Helge Deller wrote:
On 12/5/23 03:39, John David Anglin wrote:
On 2023-12-04 8:08 p.m., Guenter Roeck wrote:
I started to play with the new qemu hppa64 emulation.
This emulation is in the first row planned to be able to
be used with 64-bit kernels (until we hopefully once get
64-bit userspace).
Sadly there still seems to be a bug in the emulation
so that it fails when the kernel is built with specific
modules.... :-(
I still don't know where the bug is though.
I don't try to build / load modules, so I don't see that problem.
Good :-)
Couple of observations:
- There are spurious issues if I enable more than one CPU.
Interesting. What kind of issues? Spurious interrupts?
I am not sure if that is realistic (the emulated systems seem to be
single-CPU systems)
Yes, but shouldn't matter.
, so I dropped those tests. Historically
(with older kernels and/or older versions of qemu), multi-core boots
didn't work at all (they were slower than single-core),
Not sure if this is the case here, but for older qemu's you need
this option so that the virtual CPUs are put into their own threads/cores:
-accel tcg,thread=multi
This option isn't necessary on newer qemu versions.
so there is definitely an improvement, but it isn't stable enough
to use for kernel regression testing.
- The e1000 and e1000-82544gc network interfaces don't work
(those work fine with the 32-bit emulation)
- ne2k_pci doesn't work anywhere. I get either a hang or a spinlock recursion
error if I try.
I will try both, but at least for 64-bit emulation I might have an idea.
- Not sure it if is worth mentioning: There may be hung task crashes in
usb_start_wait_urb/usb_kill_urb during shutdown when booting from usb
or when using an usb network interface. That happens with all emulations,
though, and is not parisc specific.
Did you reported it upstream in the bug tracker?
Helge
