KVM: arm64: Propagate EHWPOISON in kvm_s2_fault_pin_pfn()

Currently kvm_s2_fault_pin_pfn() handles a poisoned page directly by
sending a SIGBUS signal itself.

This is an odd place to do it, the caller should decide what to do with
errors, so move the handling to the sole caller, user_mem_abort().

This lays the foundation for stage 2 pre-faulting which, arising from a
synthetic fault, should not send a signal.

In order to do so, check to see if user_mem_abort()'s caller has set result
- i.e. whether it wants to be informed about the outcome of the fault
handling.

If it does, then it is implied that it should handle the -EHWPOISON error
itself. This is the case for pre-faulting.

Otherwise this is real hardware, so send the signal.

No functional change intended.

Reviewed-by: Oliver Upton <oupton@kernel.org>
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20260923-kvm-arm-prefault-v4-8-d4b0b4dfa8c3@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

0 files changed, 0 insertions, 0 deletions