On 27.03.2023 12:59, Luca Fancellu wrote: > --- a/xen/arch/arm/arm64/sve.c > +++ b/xen/arch/arm/arm64/sve.c > @@ -124,3 +124,15 @@ int __init sve_parse_dom0_param(const char *str_begin, > const char *str_end) > { > return parse_integer("sve", str_begin, str_end, (int*)&opt_dom0_sve); > } > + > +void sve_arch_cap_physinfo(uint32_t *arch_capabilities) > +{ > + if ( cpu_has_sve ) > + { > + /* Vector length is divided by 128 to save some space */ > + uint32_t sve_vl = MASK_INSR(sve_encode_vl(get_sys_vl_len()), > + XEN_SYSCTL_PHYSCAP_ARM_SVE_MASK); > + > + *arch_capabilities |= sve_vl; > + } > +}
I'm again wondering why a separate function is needed, when everything that's needed is ... > --- a/xen/arch/arm/sysctl.c > +++ b/xen/arch/arm/sysctl.c > @@ -11,11 +11,14 @@ > #include <xen/lib.h> > #include <xen/errno.h> > #include <xen/hypercall.h> > +#include <asm/arm64/sve.h> ... becoming available here for use ... > #include <public/sysctl.h> > > void arch_do_physinfo(struct xen_sysctl_physinfo *pi) > { > pi->capabilities |= XEN_SYSCTL_PHYSCAP_hvm | XEN_SYSCTL_PHYSCAP_hap; > + > + sve_arch_cap_physinfo(&pi->arch_capabilities); ... here. That would be even more so if, like suggested before, get_sys_vl_len() returned 0 when !cpu_has_sve. Jan