On 03.02.2014, at 22:13, Alexander Graf <ag...@suse.de> wrote: > > On 03.02.2014, at 21:44, Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> > wrote: > >> On 03/02/14 20:02, Nitin Srivastava wrote: >> >>> Hi , >>> I downloaded the latest qemu source from git and compiled it on my >>> centos 6.5 machine. >>> According to the following e-mail from this mailing list I tried the >>> following >>> _http://comments.gmane.org/gmane.comp.emulators.qemu/181171_ >>> Test case: download the squeeze standard image from >>> _http://people.debian.org/~aurel32/qemu/powerpc/_ >>> <http://people.debian.org/%7Eaurel32/qemu/powerpc/> >>> and run with >>> qemu-system-ppc -hda debian_squeeze_powerpc_standard.qcow2 >>> but I get following error >>> VNC server running on `::1:5900' >>>>> ============================================================= >>>>> OpenBIOS 1.1 [Oct 2 2013 22:57] >>>>> Configuration device id QEMU version 1 machine id 2 >>>>> CPUs: 1 >>>>> Memory: 128M >>>>> UUID: 00000000-0000-0000-0000-000000000000 >>>>> CPU type PowerPC,750 >>>>> Not a bootable ELF image >>> qemu: terminating on signal 2 >>> nitins@nhost02%:~:117# >>> also please note that my qemu-system-ppc is latest, as its built from >>> source. >>> nitins@nhost02%:~:117#qemu-system-ppc -version >>> QEMU emulator version 1.7.50, Copyright (c) 2003-2008 Fabrice Bellard >>> nitins@nhost02%:~:118# >>> Please help. >>> Regds. >>> Nitin >> >> Hi Nitin, >> >> Having just updated to git master, I now see this issue too. A quick session >> with git bisect shows the culprit is this commit: >> >> >> build@kentang:~/src/qemu/git/qemu$ git bisect bad >> 360e607b88a23d378f6efaa769c76d26f538234d is the first bad commit >> commit 360e607b88a23d378f6efaa769c76d26f538234d >> Author: Stefano Stabellini <stefano.stabell...@eu.citrix.com> >> Date: Thu Jan 30 12:46:05 2014 +0000 >> >> address_space_translate: do not cross page boundaries >> >> The following commit: >> >> commit 149f54b53b7666a3facd45e86eece60ce7d3b114 >> Author: Paolo Bonzini <pbonz...@redhat.com> >> Date: Fri May 24 12:59:37 2013 +0200 >> >> memory: add address_space_translate >> >> breaks Xen support in QEMU, in particular the Xen mapcache. The effect >> is that one Windows XP installation out of ten would end up with BSOD. >> >> The reason is that after this commit l in address_space_rw can span a >> page boundary, however qemu_get_ram_ptr still calls xen_map_cache asking >> to map a single page (if block->offset == 0). >> >> Fix the issue by reverting to the previous behaviour: do not return a >> length from address_space_translate_internal that can span a page >> boundary. >> >> Also in address_space_translate do not ignore the length returned by >> address_space_translate_internal. >> >> This patch should be backported to QEMU 1.6.x. >> >> Signed-off-by: Stefano Stabellini <stefano.stabell...@eu.citrix.com> >> Signed-off-by: Anthony Perard <anthony.per...@citrix.com> >> Tested-by: Paolo Bonzini <pbonz...@redhat.com> >> Acked-by: Paolo Bonzini <pbonz...@redhat.com> >> Cc: qemu-sta...@nongnu.org >> >> >> Stefano/Alex, is there any reason why this would break qemu-system-ppc? > > Ugh, sorry Nitin, I should have read the email to the end. > > The image does work for me with -nographic, so I'd assume it's something > about the frame buffer map going wrong? We do successfully run the guest: > > agraf@boysenberry-1:/home/agraf/release/qemu> ./ppc-softmmu/qemu-system-ppc > -vnc :8 -snapshot -hda /dev/shm/debian_squeeze_powerpc_standard.qcow2 -serial > mon:stdio > >>> ============================================================= >>> OpenBIOS 1.1 [Oct 2 2013 22:57] >>> Configuration device id QEMU version 1 machine id 2 >>> CPUs: 1 >>> Memory: 128M >>> UUID: 00000000-0000-0000-0000-000000000000 >>> CPU type PowerPC,750 >>> Not a bootable ELF image > QEMU 1.7.50 monitor - type 'help' for more information > (qemu) x /i $pc > 0xfff0c2e0: b 0xfff0c2ec > (qemu) x /i $pc > 0xfff25dd4: lwz r0,4(r11) > (qemu) x /i $pc > 0xfff1552c: lhz r9,0(r4) > (qemu) x /i $pc > 0xfff0a868: lwz r0,20(r1) > (qemu) x /i $pc > 0xfff25d3c: stw r31,-4(r11) > (qemu) x /i $pc > 0xfff0aeb8: mr r31,r3 > (qemu) x /i $pc > 0xfff0b050: mr r31,r3 > (qemu) x /i $pc > 0xfff0a6cc: lis r9,-5 > (qemu) x /i $pc > 0xc0252a5c: mr r3,r31 > (qemu) x /i $pc > 0xc003e274: lwz r9,68(r30) > > so it's really only the VGA output that's broken.
A simple git revert of Stefanos patch makes VGA work again. The diff of "info mtree" of a mac99 system with and without his patch is the following: --- x 2014-02-03 23:57:20.000000000 +0100 +++ y 2014-02-03 23:56:14.000000000 +0100 @@ -30,6 +30,7 @@ aliases pci-mmio 0000000000000000-00000000ffffffff (prio 0, RW): pci-mmio + 00000000000a0000-00000000000affff (prio 2, RW): alias vga.chain4 @vga.vram 0000000000000000-000000000000ffff 00000000000a0000-00000000000bffff (prio 1, RW): vga-lowmem 0000000080000000-0000000080ffffff (prio 1, RW): vga.vram 0000000081000000-0000000081000fff (prio 1, RW): vga.mmio @@ -77,6 +78,8 @@ 00000000000003d4-00000000000003d5 (prio 0, RW): vga 00000000000003da-00000000000003da (prio 0, RW): vga 0000000000000400-00000000000004ff (prio 1, RW): ne2000 +vga.vram +0000000080000000-0000000080ffffff (prio 1, RW): vga.vram escc-bar 0000000000013000-000000000001303f (prio 0, RW): alias escc-bar @escc 0000000000000000-000000000000003f escc I'm still not quite sure what did cause the breakage. Alex
