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Diffstat (limited to 'results/classifier/108/other/1901359')
| -rw-r--r-- | results/classifier/108/other/1901359 | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/results/classifier/108/other/1901359 b/results/classifier/108/other/1901359 new file mode 100644 index 00000000..c85b5139 --- /dev/null +++ b/results/classifier/108/other/1901359 @@ -0,0 +1,73 @@ +other: 0.810 +device: 0.790 +graphic: 0.762 +semantic: 0.752 +performance: 0.708 +PID: 0.666 +network: 0.658 +vnc: 0.633 +files: 0.630 +permissions: 0.603 +debug: 0.570 +socket: 0.564 +KVM: 0.412 +boot: 0.412 + +ignore bit 0 in pci CONFIG_ADDRESS register write for Type 1 access + +I'v recently stumbled upon a bug in the Plan9 PCI config space access routines for config mode #1. + +The code used to set bit 0 in the CONFIG_ADDRESS register for a Type 1 access. + +This was most likely a misreading of the PCI local bus specification on our side. + +However, in the PCI local bus specification 3.0, it states the following: + +> 3.2.2.3.2 Software Generation of Configuration Transactions +> ... +> For Type 1 translations, the host bridge directly copies the contents of the +> CONFIG_ADDRESS register (excluding bits 31 and 0) onto the PCI AD lines during the +> address phase of a configuration transaction making sure that AD[1::0] is "01". + +note the: "excluding bits 31 and 0" + +What happens in qemu instead is that it uses bit 0 of the CONFIG_ADDRESS +register as part of the register offset (when it probably should ignore it) +when translating from Type 1 to Type 0 address. So once it reaches the device +behind the bridge the register address is off by one. + +is anybody home? + +Yeah, the bug tracker here on Launchpad is somewhat neglected ... Therefore: +The QEMU project is currently moving its bug tracking to another system. +For this we need to know which bugs are still valid and which could be +closed already. Thus we are setting the bug state to "Incomplete" now. + +If the bug has already been fixed in the latest upstream version of QEMU, +then please close this ticket as "Fix released". + +If it is not fixed yet and you think that this bug report here is still +valid, then you have two options: + +1) If you already have an account on gitlab.com, please open a new ticket +for this problem in our new tracker here: + + https://gitlab.com/qemu-project/qemu/-/issues + +and then close this ticket here on Launchpad (or let it expire auto- +matically after 60 days). Please mention the URL of this bug ticket on +Launchpad in the new ticket on GitLab. + +2) If you don't have an account on gitlab.com and don't intend to get +one, but still would like to keep this ticket opened, then please switch +the state back to "New" or "Confirmed" within the next 60 days (other- +wise it will get closed as "Expired"). We will then eventually migrate +the ticket automatically to the new system (but you won't be the reporter +of the bug in the new system and thus you won't get notified on changes +anymore). + +Thank you and sorry for the inconvenience. + + +[Expired for QEMU because there has been no activity for 60 days.] + |