target/arm/cpu: Introduce sve_vq_supported bitmap

Allow CPUs that support SVE to specify which SVE vector lengths they
support by setting them in this bitmap. Currently only the 'max' and
'host' CPU types supports SVE and 'host' requires KVM which obtains
its supported bitmap from the host. So, we only need to initialize the
bitmap for 'max' with TCG. And, since 'max' should support all SVE
vector lengths we simply fill the bitmap. Future CPU types may have
less trivial maps though.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823160647.34028-2-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 5cf8996..1060825 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1020,9 +1020,13 @@ struct ARMCPU {
      * While processing properties during initialization, corresponding
      * sve_vq_init bits are set for bits in sve_vq_map that have been
      * set by properties.
+     *
+     * Bits set in sve_vq_supported represent valid vector lengths for
+     * the CPU type.
      */
     DECLARE_BITMAP(sve_vq_map, ARM_MAX_VQ);
     DECLARE_BITMAP(sve_vq_init, ARM_MAX_VQ);
+    DECLARE_BITMAP(sve_vq_supported, ARM_MAX_VQ);
 
     /* Generic timer counter frequency, in Hz */
     uint64_t gt_cntfrq_hz;