On 2/2/26 14:33, Peter Maydell wrote:
With FEAT_SME, even a CPU which does not implement FEAT_SVE is
allowed to execute the subset of SVE instructions which are permitted
in streaming SVE mode. We correctly handle this when the emulated
CPU has both FEAT_SVE and FEAT_SME, because sve_access_check()
includes the logic for this, matching the pseudocode
CheckSVEEnabled(). However if the emulated CPU only implement
FEAT_SME, it will fail the initial dc_isar_feature(aa64_sve, s)
feature check, because this doesn't match the check in the
per-instruction decode pseudocode, which is typically:
!IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME)
Add a new aa64_sme_or_sve feature function that we can use
to update the relevant uses of aa64_sve, and similarly
aa64_sme_or_sve2 for where we need to check FEAT_SVE2 || FEAT_SME.
Signed-off-by: Peter Maydell <[email protected]>
---
target/arm/cpu-features.h | 10 ++++++++++
1 file changed, 10 insertions(+)
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
