[PATCH v5 5/7] KVM: arm64: Add a macro for creating filtered sys_reg_descs entries

[Gavin Shan]

On 10/15/24 11:39 PM, Joey Gouly wrote:
> From: James Morse <james.morse at arm.com>
> 
> The sys_reg_descs array holds function pointers and reset value for
> managing the user-space and guest view of system registers. These
> are mostly created by a set of macro's as only some combinations
> of behaviour are needed.
> 
> If a register needs special treatment, its sys_reg_descs entry is
> open-coded. This is true of some id registers where the value provided
> by user-space is validated by some helpers.
> 
> Before adding another one of these, add a helper that covers the
> existing special cases. 'ID_FILTERED' expects helpers to set the
> user-space value, and retrieve the modified reset value.
> 
> Like ID_WRITABLE() this uses id_visibility(), which should have no functional
> change for the registers converted to use ID_FILTERED().
> 
> read_sanitised_id_aa64dfr0_el1() and read_sanitised_id_aa64pfr0_el1() have been
> refactored to be called kvm_read_sanitised_id_reg(), to try be consistent with
> ID_WRITABLE().
> 
> Signed-off-by: James Morse <james.morse at arm.com>
> Signed-off-by: Joey Gouly <joey.gouly at arm.com>
> ---
>   arch/arm64/kvm/sys_regs.c | 62 +++++++++++++++++++++++----------------
>   1 file changed, 36 insertions(+), 26 deletions(-)
> 

Reviewed-by: Gavin Shan <gshan at redhat.com>