| Message ID | 20230412094938.2693890-4-luca.fancellu@arm.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | SVE feature for arm guests | expand |
Hi Luca, > On 12 Apr 2023, at 11:49, Luca Fancellu <Luca.Fancellu@arm.com> wrote: > > When a guest is allowed to use SVE, expose the SVE features through > the identification registers. > > Signed-off-by: Luca Fancellu <luca.fancellu@arm.com> Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com> Cheers Bertrand > --- > CHanges from v4: > - no changes > Changes from v3: > - no changes > Changes from v2: > - no changes > Changes from v1: > - No changes > Changes from RFC: > - No changes > --- > xen/arch/arm/arm64/vsysreg.c | 39 ++++++++++++++++++++++++++++++++++-- > 1 file changed, 37 insertions(+), 2 deletions(-) > > diff --git a/xen/arch/arm/arm64/vsysreg.c b/xen/arch/arm/arm64/vsysreg.c > index 758750983c11..10048bb4d221 100644 > --- a/xen/arch/arm/arm64/vsysreg.c > +++ b/xen/arch/arm/arm64/vsysreg.c > @@ -18,6 +18,7 @@ > > #include <xen/sched.h> > > +#include <asm/arm64/cpufeature.h> > #include <asm/current.h> > #include <asm/regs.h> > #include <asm/traps.h> > @@ -295,7 +296,28 @@ void do_sysreg(struct cpu_user_regs *regs, > GENERATE_TID3_INFO(MVFR0_EL1, mvfr, 0) > GENERATE_TID3_INFO(MVFR1_EL1, mvfr, 1) > GENERATE_TID3_INFO(MVFR2_EL1, mvfr, 2) > - GENERATE_TID3_INFO(ID_AA64PFR0_EL1, pfr64, 0) > + > + case HSR_SYSREG_ID_AA64PFR0_EL1: > + { > + register_t guest_reg_value = guest_cpuinfo.pfr64.bits[0]; > + > + if ( is_sve_domain(v->domain) ) > + { > + /* 4 is the SVE field width in id_aa64pfr0_el1 */ > + uint64_t mask = GENMASK(ID_AA64PFR0_SVE_SHIFT + 4 - 1, > + ID_AA64PFR0_SVE_SHIFT); > + /* sysval is the sve field on the system */ > + uint64_t sysval = cpuid_feature_extract_unsigned_field_width( > + system_cpuinfo.pfr64.bits[0], > + ID_AA64PFR0_SVE_SHIFT, 4); > + guest_reg_value &= ~mask; > + guest_reg_value |= (sysval << ID_AA64PFR0_SVE_SHIFT) & mask; > + } > + > + return handle_ro_read_val(regs, regidx, hsr.sysreg.read, hsr, 1, > + guest_reg_value); > + } > + > GENERATE_TID3_INFO(ID_AA64PFR1_EL1, pfr64, 1) > GENERATE_TID3_INFO(ID_AA64DFR0_EL1, dbg64, 0) > GENERATE_TID3_INFO(ID_AA64DFR1_EL1, dbg64, 1) > @@ -306,7 +328,20 @@ void do_sysreg(struct cpu_user_regs *regs, > GENERATE_TID3_INFO(ID_AA64MMFR2_EL1, mm64, 2) > GENERATE_TID3_INFO(ID_AA64AFR0_EL1, aux64, 0) > GENERATE_TID3_INFO(ID_AA64AFR1_EL1, aux64, 1) > - GENERATE_TID3_INFO(ID_AA64ZFR0_EL1, zfr64, 0) > + > + case HSR_SYSREG_ID_AA64ZFR0_EL1: > + { > + /* > + * When the guest has the SVE feature enabled, the whole id_aa64zfr0_el1 > + * needs to be exposed. > + */ > + register_t guest_reg_value = guest_cpuinfo.zfr64.bits[0]; > + if ( is_sve_domain(v->domain) ) > + guest_reg_value = system_cpuinfo.zfr64.bits[0]; > + > + return handle_ro_read_val(regs, regidx, hsr.sysreg.read, hsr, 1, > + guest_reg_value); > + } > > /* > * Those cases are catching all Reserved registers trapped by TID3 which > -- > 2.34.1 >
diff --git a/xen/arch/arm/arm64/vsysreg.c b/xen/arch/arm/arm64/vsysreg.c index 758750983c11..10048bb4d221 100644 --- a/xen/arch/arm/arm64/vsysreg.c +++ b/xen/arch/arm/arm64/vsysreg.c @@ -18,6 +18,7 @@ #include <xen/sched.h> +#include <asm/arm64/cpufeature.h> #include <asm/current.h> #include <asm/regs.h> #include <asm/traps.h> @@ -295,7 +296,28 @@ void do_sysreg(struct cpu_user_regs *regs, GENERATE_TID3_INFO(MVFR0_EL1, mvfr, 0) GENERATE_TID3_INFO(MVFR1_EL1, mvfr, 1) GENERATE_TID3_INFO(MVFR2_EL1, mvfr, 2) - GENERATE_TID3_INFO(ID_AA64PFR0_EL1, pfr64, 0) + + case HSR_SYSREG_ID_AA64PFR0_EL1: + { + register_t guest_reg_value = guest_cpuinfo.pfr64.bits[0]; + + if ( is_sve_domain(v->domain) ) + { + /* 4 is the SVE field width in id_aa64pfr0_el1 */ + uint64_t mask = GENMASK(ID_AA64PFR0_SVE_SHIFT + 4 - 1, + ID_AA64PFR0_SVE_SHIFT); + /* sysval is the sve field on the system */ + uint64_t sysval = cpuid_feature_extract_unsigned_field_width( + system_cpuinfo.pfr64.bits[0], + ID_AA64PFR0_SVE_SHIFT, 4); + guest_reg_value &= ~mask; + guest_reg_value |= (sysval << ID_AA64PFR0_SVE_SHIFT) & mask; + } + + return handle_ro_read_val(regs, regidx, hsr.sysreg.read, hsr, 1, + guest_reg_value); + } + GENERATE_TID3_INFO(ID_AA64PFR1_EL1, pfr64, 1) GENERATE_TID3_INFO(ID_AA64DFR0_EL1, dbg64, 0) GENERATE_TID3_INFO(ID_AA64DFR1_EL1, dbg64, 1) @@ -306,7 +328,20 @@ void do_sysreg(struct cpu_user_regs *regs, GENERATE_TID3_INFO(ID_AA64MMFR2_EL1, mm64, 2) GENERATE_TID3_INFO(ID_AA64AFR0_EL1, aux64, 0) GENERATE_TID3_INFO(ID_AA64AFR1_EL1, aux64, 1) - GENERATE_TID3_INFO(ID_AA64ZFR0_EL1, zfr64, 0) + + case HSR_SYSREG_ID_AA64ZFR0_EL1: + { + /* + * When the guest has the SVE feature enabled, the whole id_aa64zfr0_el1 + * needs to be exposed. + */ + register_t guest_reg_value = guest_cpuinfo.zfr64.bits[0]; + if ( is_sve_domain(v->domain) ) + guest_reg_value = system_cpuinfo.zfr64.bits[0]; + + return handle_ro_read_val(regs, regidx, hsr.sysreg.read, hsr, 1, + guest_reg_value); + } /* * Those cases are catching all Reserved registers trapped by TID3 which
When a guest is allowed to use SVE, expose the SVE features through the identification registers. Signed-off-by: Luca Fancellu <luca.fancellu@arm.com> --- CHanges from v4: - no changes Changes from v3: - no changes Changes from v2: - no changes Changes from v1: - No changes Changes from RFC: - No changes --- xen/arch/arm/arm64/vsysreg.c | 39 ++++++++++++++++++++++++++++++++++-- 1 file changed, 37 insertions(+), 2 deletions(-)