[PATCH v2 2/3] KVM: arm64: Use get_raz_reg() for userspace reads of PMSWINC_EL0

[Andrew Jones]

On Mon, Oct 11, 2021 at 11:58:39AM +0100, Alexandru Elisei wrote:
> PMSWINC_EL0 is a write-only register and was initially part of the VCPU
> register state, but was later removed in commit 7a3ba3095a32 ("KVM:
> arm64: Remove PMSWINC_EL0 shadow register"). To prevent regressions, the
> register was kept accessible from userspace as Read-As-Zero (RAZ).
> 
> The read function that is used to handle userspace reads of this
> register is get_raz_id_reg(), which, while technically correct, as it
> returns 0, it is not semantically correct, as PMSWINC_EL0 is not an ID
> register as the function name suggests.
> 
> Add a new function, get_raz_reg(), to use it as the accessor for
> PMSWINC_EL0, as to not conflate get_raz_id_reg() to handle other types
> of registers.
> 
> No functional change intended.
> 
> Signed-off-by: Alexandru Elisei <alexandru.elisei at arm.com>
> ---
>  arch/arm64/kvm/sys_regs.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>

Reviewed-by: Andrew Jones <drjones at redhat.com>