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Diffstat (limited to 'results/classifier/105/socket/796202')
| -rw-r--r-- | results/classifier/105/socket/796202 | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/results/classifier/105/socket/796202 b/results/classifier/105/socket/796202 deleted file mode 100644 index ca94772e..00000000 --- a/results/classifier/105/socket/796202 +++ /dev/null @@ -1,83 +0,0 @@ -socket: 0.871 -instruction: 0.871 -graphic: 0.836 -other: 0.827 -boot: 0.813 -network: 0.805 -device: 0.803 -semantic: 0.794 -vnc: 0.793 -mistranslation: 0.694 -assembly: 0.558 -KVM: 0.478 - -Doing a 64 bit load from a 32 bit local APIC register is allowed - -Doing - -u64 lapic_idregister = (u64) fix_to_virt(FIX_APIC_BASE) + 0x20; - -and later in an interrupt handler - -movq (lapic_idregister), %rcx -movq (%rcx), %rcx - -in a linux kernel module works in qemu 0.13.91 but not on real hardware (it simply reboots). -On real hardware only - -movl (%rcx), %ecx - -works (also in qemu). - -Commandline: -qemu-system-x86_64 \ - -kernel $LINUXDIR/arch/x86_64/boot/bzImage \ - -hda $BUILDROOTDIR/output/images/rootfs.ext2 \ - -append "root=/dev/sda rw rootfstype=ext2 maxcpus=4" \ - -cpu phenom \ - -smp 4 \ - -gdb tcp::1234 \ - -net nic -net user - -Guest: -Vanilla Linux Kernel 2.6.37.6 64-bit with buildroot - -Mikael Pettersson from the linux kernel mailinglist told me it's an accepts-invalid bug in qemu. - -On Sun, Jun 12, 2011 at 4:03 PM, Robert Uhl <email address hidden> wrote: -> Public bug reported: -> -> Doing -> -> u64 lapic_idregister = (u64) fix_to_virt(FIX_APIC_BASE) + 0x20; -> -> and later in an interrupt handler -> -> movq (lapic_idregister), %rcx -> movq (%rcx), %rcx -> -> in a linux kernel module works in qemu 0.13.91 but not on real hardware (it simply reboots). -> On real hardware only -> -> movl (%rcx), %ecx -> -> works (also in qemu). - -Thank you for the report. Currently QEMU devices only provide access -methods up to 32 bits, a 64 bit access is emulated with two 32 bit -accesses. So it is not possible to handle a 32 bit access differently -from a 64 bit one for now. - -So far this hasn't been considered to be a problem for x86, though it -is clearly not correct for Sparc and Alpha. This report shows that it -is necessary to add 64 bit access methods (or otherwise handle 64 bit -accesses more realistically) since x86 is also affected. - -Adding the 64 bit method would be a major refactoring though and there -are other designs possible. - - -Triaging old bug tickets ... can you somehow still reproduce this problem with the latest version of QEMU (currently v2.9), or could we close this ticket nowadays? - -[Expired for QEMU because there has been no activity for 60 days.] - |