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authorAndrew Jones <drjones@redhat.com>2019-10-31 15:27:29 +0100
committerPeter Maydell <peter.maydell@linaro.org>2019-11-01 20:40:59 +0000
commit0df9142d27d519f8686c8e92b8cfc4e04f2ddbe3 (patch)
tree9bbbb51bb998c3fc331ff136ccfd6d2cd73f3d45 /include
parent73234775ad61892409ef9cbde9100b3bdee8a70f (diff)
target/arm/cpu64: max cpu: Introduce sve<N> properties
Introduce cpu properties to give fine control over SVE vector lengths. We introduce a property for each valid length up to the current maximum supported, which is 2048-bits. The properties are named, e.g. sve128, sve256, sve384, sve512, ..., where the number is the number of bits. See the updates to docs/arm-cpu-features.rst for a description of the semantics and for example uses. Note, as sve-max-vq is still present and we'd like to be able to support qmp_query_cpu_model_expansion with guests launched with e.g. -cpu max,sve-max-vq=8 on their command lines, then we do allow sve-max-vq and sve<N> properties to be provided at the same time, but this is not recommended, and is why sve-max-vq is not mentioned in the document. If sve-max-vq is provided then it enables all lengths smaller than and including the max and disables all lengths larger. It also has the side-effect that no larger lengths may be enabled and that the max itself cannot be disabled. Smaller non-power-of-two lengths may, however, be disabled, e.g. -cpu max,sve-max-vq=4,sve384=off provides a guest the vector lengths 128, 256, and 512 bits. This patch has been co-authored with Richard Henderson, who reworked the target/arm/cpu64.c changes in order to push all the validation and auto-enabling/disabling steps into the finalizer, resulting in a nice LOC reduction. Signed-off-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Reviewed-by: Beata Michalska <beata.michalska@linaro.org> Message-id: 20191031142734.8590-5-drjones@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'include')
-rw-r--r--include/qemu/bitops.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 3f0926cf40..ee76552c06 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -20,6 +20,7 @@
#define BITS_PER_LONG (sizeof (unsigned long) * BITS_PER_BYTE)
#define BIT(nr) (1UL << (nr))
+#define BIT_ULL(nr) (1ULL << (nr))
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))