diff options
Diffstat (limited to 'gitlab/issues_text/target_arm/host_missing/accel_missing/2886')
| -rw-r--r-- | gitlab/issues_text/target_arm/host_missing/accel_missing/2886 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gitlab/issues_text/target_arm/host_missing/accel_missing/2886 b/gitlab/issues_text/target_arm/host_missing/accel_missing/2886 new file mode 100644 index 000000000..3c58f990a --- /dev/null +++ b/gitlab/issues_text/target_arm/host_missing/accel_missing/2886 @@ -0,0 +1,15 @@ +ACPI MADT advertises GITS even when disabled +Description of problem: +As per the command line given above, QEMU shall emulate a GICv4 without GIC Interrupt Translation Service (GITS). + +The following happens: +- ACPI **incorrectly** lists a GITS (type 0xf) structure in the MADT with GITS MMIO Base = 0x8080000 +- The OS reads that structure and interprets it to mean a GITS is present at the given MMIO address +- Subsequent access to GITS MMIO causes a data abort (0x25) because QEMU doesn't emulate a GITS (as requested) + +The bug is thus that QEMU wrongly advertises GITS as present (via the MADT) when it is in fact absent. +Steps to reproduce: +1. Disable GITS emulation by passing `its=off` on the QEMU command line +2. Check if a GITS structure is listed in the ACPI MADT (must be present in ACPI MADT only if GITS is enabled and absent otherwise) +Additional information: +When booting with `its=on` (default), everything works as expected. |