[Qemu-devel] [Bug 1838277] [NEW] qemu-system-aarch64: regression: msr vbar_el2, xN not working in EL2

[Elouan Appéré]

Public bug reported:

Affects 3.1.0 (latest stable release) and latest commit
(893dc8300c80e3dc32f31e968cf7aa0904da50c3) but did *not* affect 2.11
(qemu from bionic ubuntu LTS).

With the following code and shell commands:

test.s:

.text
mov x0, #0x60000000
msr vbar_el2, x0
dsb sy
isb sy

$ aarch64-none-elf-as test.s -o test.o
$ aarch64-none-elf-objcopy -S -O binary test.o test.bin
$ qemu-system-aarch64 -nographic -machine virt,virtualization=on -cpu 
cortex-a57 -kernel test.bin -s -S

vbar_el2 is still 0 after the code, instead of being the expected
0x60000000. (see screenshot).

This regression doesn't seem to happen for vbar_el1 &
virtualization=off.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "gdb screenshot"
   https://bugs.launchpad.net/bugs/1838277/+attachment/5279820/+files/vbar.png

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https://bugs.launchpad.net/bugs/1838277

Title:
  qemu-system-aarch64: regression: msr vbar_el2, xN not working in EL2

Status in QEMU:
  New

Bug description:
  Affects 3.1.0 (latest stable release) and latest commit
  (893dc8300c80e3dc32f31e968cf7aa0904da50c3) but did *not* affect 2.11
  (qemu from bionic ubuntu LTS).

  With the following code and shell commands:

  test.s:

  .text
  mov x0, #0x60000000
  msr vbar_el2, x0
  dsb sy
  isb sy

  $ aarch64-none-elf-as test.s -o test.o
  $ aarch64-none-elf-objcopy -S -O binary test.o test.bin
  $ qemu-system-aarch64 -nographic -machine virt,virtualization=on -cpu 
cortex-a57 -kernel test.bin -s -S

  vbar_el2 is still 0 after the code, instead of being the expected
  0x60000000. (see screenshot).

  This regression doesn't seem to happen for vbar_el1 &
  virtualization=off.

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