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target/arm/cpu: Introduce sve_vq_supported bitmap

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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>
This commit is contained in:
Andrew Jones 2021-08-23 18:06:44 +02:00 committed by Peter Maydell
parent 0659e4680e
commit 5401b1e08d
2 changed files with 6 additions and 0 deletions
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4
target/arm/cpu.h
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@ -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;

2
target/arm/cpu64.c
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@ -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);