On 03/03/2022 12:57, Jan Kiszka wrote:
On 25.02.22 15:29, Ralf Ramsauer wrote:
GICv3s in recent QEMU versions have ITS (Interrupt Translation Service)
enabled by default, which Linux will make use of. We will crash when
trying to re-assigning a CPU back to the root cell, as the root
cell's Linux will try to access ITS regions when powering up a CPU.
As we don't support ITS in Jailhouse, disable ITS for the moment.
Signed-off-by: Ralf Ramsauer <[email protected]>
Reported-by: Stefan Huber <[email protected]>
---
README.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/README.md b/README.md
index f1b0cbe3..b5937300 100644
--- a/README.md
+++ b/README.md
@@ -365,7 +365,7 @@ Similarly like x86, Jailhouse can be tried out in a
completely emulated ARM64
Start the QEMU machine like this:
qemu-system-aarch64 -cpu cortex-a57 -smp 16 -m 1G \
- -machine virt,gic-version=3,virtualization=on -nographic \
+ -machine virt,gic-version=3,virtualization=on,its=off -nographic \
-netdev user,id=net -device virtio-net-device,netdev=net \
-drive
file=LinuxInstallation.img,format=raw|qcow2|...,id=disk,if=none \
-device virtio-blk-device,drive=disk \
Good catch. Is this feature flag understood by the recommended QEMU
version, or do we need to lift that lower limit along this?
Tested in docker:
Debian 11 (5.2.x) supports it.
Debian 10 (3.1.0) supports it.
Debian 9 (2.8.1) doesn't support it.
I don't have a chance to test our recommended version 3.0. So maybe
lifting the limit to 3.1.0 is a good idea.
Thanks
Ralf
Jan
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