When we direct boot a kernel on a CPU which emulates EL3, we need to
set up the EL3 system registers as the Linux kernel documentation
specifies:
https://www.kernel.org/doc/Documentation/arm64/booting.rst
Mostly we get this right, but working through the list of config
bits that need to be set, I found that we'd missed a few things:
- FEAT_HCX: SCR_EL3.HXEn (bit 38) must be initialised to 0b1
- SVE: ZCR_EL3.LEN should be initialized to a sensible value.
We leave it at 0, which means the guest can only use the
minimum vector length supported by the CPU, not the full range.
- SME: ditto for SMCR_EL3.LEN
This series fixes those.
thanks
-- PMM
Peter Maydell (2):
hw/arm/boot: Set SME and SVE EL3 vector lengths when booting kernel
hw/arm/boot: Set SCR_EL3.HXEn when booting kernel
hw/arm/boot.c | 5 +++++
1 file changed, 5 insertions(+)
--
2.25.1
