Hello Palmer,
Any updates on those 3 patches ?
Regards,
Nick
Στις 2021-11-26 20:04, Nick Kossifidis έγραψε:
On kdump instead of using an intermediate step to relocate the kernel,
that lives in a "control buffer" outside the current kernel's mapping,
we jump to the crash kernel directly by calling
riscv_kexec_norelocate().
The current implementation uses va_pa_offset while switching to
physical
addressing, however since we moved the kernel outside the linear
mapping
this won't work anymore since riscv_kexec_norelocate() is part of the
kernel mapping and we should use kernel_map.va_kernel_pa_offset, and
also
take XIP kernel into account.
We don't really need to use va_pa_offset on riscv_kexec_norelocate, we
can just set STVEC to the physical address of the new kernel instead
and
let the hart jump to the new kernel on the next instruction after
setting
SATP to zero. This fixes kdump and is also simpler/cleaner.
I tested this on the latest qemu and HiFive Unmatched and works as
expected.
v2: I removed the direct jump after setting satp as suggested.
Fixes: 2bfc6cd81bd1 ("riscv: Move kernel mapping outside of linear
mapping")
Signed-off-by: Nick Kossifidis <mick@xxxxxxxxxxxx>
Reviewed-by: Alexandre Ghiti <alex@xxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 5.13
Cc: <stable@xxxxxxxxxxxxxxx> # 5.14
