Re: [Xen-devel] trouble with the new mmap-batch interface

[Brendan Cully <brendan@xxxxxxxxx>]

On Tuesday, 19 January 2010 at 23:02, Brendan Cully wrote:
> Hi all,
> 
> I'm having some trouble with the new mmap-batch ioctl. With ioemu
> revision a0066d "use new (replacement) mmap-batch ioctl" applied, my
> HVM domain dies as soon as it is unpaused. The first suspicious line
> in xm dmesg is
> 
> (XEN) HVM3:  - REP INSB across page boundaries ... Bad value at 0x005ffffc: 
> saw 00000000 e
> (XEN) HVM3: xpected ff000000
> (XEN) HVM3: Bad value at 0x00601000: saw 00000000 expected 000000ff
> (XEN) HVM3: failed
> 
> and the qemu log ends at
> cirrus vga map change while on lfb mode
> 
> If I revert to ioemu 3b531c "passthrough: fix a printf format
> specifier" then the INSB test passes and the domain runs fine.
> 
> I'm running 32-bit 2.6.18.8 dom0 (984:0bec29c94ce9), 32-bit HVM guest,
> and 64-bit xen (Tue Jan 19 15:44:54 2010 +0000 20824:07f95839e431)
> 
> It seems unlikely to me that this is actual breakage, but I've built
> world a couple of times. Before I put printfs everywhere I thought I'd
> ask if anyone else had seen this or had any ideas.

The attached patch fixes ioemu for me.

mapforeignbulk-prezeroerr.patch
Description: Text document

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