Re: [Qemu-devel] Testing sysbus devices

[Thomas Huth <thuth@redhat.com>]

On 18/02/2019 07.07, Stephen Checkoway wrote:
> Hi all,
> 
> I've been working on some improvements to the pflash_cfi02 block device (interleaved flash devices similar to pflash_cfi01, multi-sector erase, nonuniform sector sizes, and some bug fixes and I'm planning on implementing sector erase suspend/resume commands in the near future).
> 
> There appear to be no existing tests for this device and I'm unsure what the appropriate way to add tests for sysbus devices is. -device can't be used because sysbus devices aren't user-creatable (and even if they were, creating the device wouldn't be sufficient since it wouldn't connect it to the sysbus).
> 
> Any suggestions would be appreciated.

I think you could use one of the machines that has a cfi02 on board. For
example: Write some random data to a temporary file. Run qemu with:

 QTestState *qts;
 qts = qtest_initf(" qemu-system-arm -M musicpal,accel=qtest "
                "-drive if=pflash,file=%s,format=raw", filename);

Then you should be able to access the device with the qtest_read/write
functions, e.g. use "qtest_memread(qts, 0x100000000ULL, ...)" to read
the contents of the device. I haven't tried that though, that's just my
quick assumption from looking at hw/arm/musicpal.c ...

 Thomas