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>

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 5cf8996ae3cf1753af5c51b85d76cc6677b062fb..1060825c7466df406cca623b71360242be72c42f 100644 (file)
--- 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;

diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index c690318a9b63a928d06ac01c92823b501ee00996..eb9318c83b7493c9f2b6e439f1bff7e811ceeb69 100644 (file)
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -840,6 +840,8 @@ static void aarch64_max_initfn(Object *obj)
         /* Default to PAUTH on, with the architected algorithm. */
         qdev_property_add_static(DEVICE(obj), &arm_cpu_pauth_property);
         qdev_property_add_static(DEVICE(obj), &arm_cpu_pauth_impdef_property);
+
+        bitmap_fill(cpu->sve_vq_supported, ARM_MAX_VQ);
     }
 
     aarch64_add_sve_properties(obj);