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[Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG some
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB |
Date: |
Tue, 30 Jul 2019 11:31:14 -0000 |
Can you please provide clear and exact reproduction instructions and
binaries for whatever the bugs you think you're seeing are? Bear in mind
that I know nothing at all about your guest binary or how it is supposed
to behave, and I am not going to build versions of your binary from
source. If I need to look at things via the gdb interface, give exact
sequences of gdb commands I need to use to reproduce the behaviour and
say what you were expecting the behaviour to be.
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https://bugs.launchpad.net/bugs/1838277
Title:
qemu-system-aarch64: regression: TCG sometimes using wrong values for
VBAR_EL2 despite it being correctly reported to GDB
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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- [Qemu-devel] [Bug 1838277] [NEW] qemu-system-aarch64: regression: msr vbar_el2, xN not working in EL2, Elouan Appéré, 2019/07/29
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: msr vbar_el2, xN not working in EL2, Elouan Appéré, 2019/07/29
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: msr vbar_el2, xN not working in EL2, Alex Bennée, 2019/07/29
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: msr vbar_el2, xN not working in EL2, Peter Maydell, 2019/07/29
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: msr vbar_el2, xN not working in EL2, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Peter Maydell, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Peter Maydell, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB,
Peter Maydell <=
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Peter Maydell, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Peter Maydell, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Peter Maydell, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression: TCG sometimes using wrong values for VBAR_EL2 despite it being correctly reported to GDB, Elouan Appéré, 2019/07/30
- [Qemu-devel] [Bug 1838277] Re: qemu-system-aarch64: regression in 3.1: breakpoint instructions routed to EL1 from EL2 when ELD is EL1, Elouan Appéré, 2019/07/30