[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 06/10] xen/arm: enable Dom0 to use SVE feature
Add a command line parameter to allow Dom0 the use of SVE resources, the command line parameter dom0_sve controls the feature on this domain and sets the maximum SVE vector length for Dom0. Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx> --- Changes from v1: - No changes Changes from RFC: - Changed docs to explain that the domain won't be created if the requested vector length is above the supported one from the platform. --- docs/misc/xen-command-line.pandoc | 13 +++++++++++++ xen/arch/arm/arm64/sve.c | 5 +++++ xen/arch/arm/domain_build.c | 4 ++++ xen/arch/arm/include/asm/arm64/sve.h | 4 ++++ 4 files changed, 26 insertions(+) diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line.pandoc index f68deaa6a97a..58d4bd7574a3 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -1005,6 +1005,19 @@ restrictions set up here. Note that the values to be specified here are ACPI PXM ones, not Xen internal node numbers. `relaxed` sets up vCPU affinities to prefer but be not limited to the specified node(s). +### dom0_sve (arm) +> `= <integer>` + +> Default: `0` + +Enable arm SVE usage for Dom0 domain and sets the maximum SVE vector length. +Values above 0 means feature is enabled for Dom0, otherwise feature is disabled. +Possible values are from 0 to maximum 2048, being multiple of 128, that will be +the maximum vector length. +Please note that the platform can supports a lower value, if the requested value +is above the supported one, the domain creation will fail and the system will +stop. + ### dom0_vcpus_pin > `= <boolean>` diff --git a/xen/arch/arm/arm64/sve.c b/xen/arch/arm/arm64/sve.c index 1b95a3cbadd1..6593b59b58e8 100644 --- a/xen/arch/arm/arm64/sve.c +++ b/xen/arch/arm/arm64/sve.c @@ -5,10 +5,15 @@ * Copyright (C) 2022 ARM Ltd. */ +#include <xen/param.h> #include <xen/sched.h> #include <xen/sizes.h> #include <asm/arm64/sve.h> +/* opt_dom0_sve: allow Dom0 to use SVE and set maximum vector length. */ +unsigned int __initdata opt_dom0_sve; +integer_param("dom0_sve", opt_dom0_sve); + extern unsigned int sve_get_hw_vl(void); extern void sve_save_ctx(uint64_t *sve_ctx, uint64_t *pregs, int save_ffr); extern void sve_load_ctx(uint64_t const *sve_ctx, uint64_t const *pregs, diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 9707eb7b1bb1..b46c30ab24b1 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -26,6 +26,7 @@ #include <asm/platform.h> #include <asm/psci.h> #include <asm/setup.h> +#include <asm/arm64/sve.h> #include <asm/cpufeature.h> #include <asm/domain_build.h> #include <xen/event.h> @@ -4084,6 +4085,9 @@ void __init create_dom0(void) if ( iommu_enabled ) dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu; + if ( opt_dom0_sve > 0 ) + dom0_cfg.arch.sve_vl_bits = opt_dom0_sve; + dom0 = domain_create(0, &dom0_cfg, CDF_privileged | CDF_directmap); if ( IS_ERR(dom0) ) panic("Error creating domain 0 (rc = %ld)\n", PTR_ERR(dom0)); diff --git a/xen/arch/arm/include/asm/arm64/sve.h b/xen/arch/arm/include/asm/arm64/sve.h index 28c31b329233..dc6e747cec9e 100644 --- a/xen/arch/arm/include/asm/arm64/sve.h +++ b/xen/arch/arm/include/asm/arm64/sve.h @@ -21,6 +21,8 @@ static inline bool is_vl_valid(uint16_t vl) #ifdef CONFIG_ARM64_SVE +extern unsigned int opt_dom0_sve; + register_t compute_max_zcr(void); register_t vl_to_zcr(uint16_t vl); uint16_t get_sys_vl_len(void); @@ -31,6 +33,8 @@ void sve_restore_state(struct vcpu *v); #else /* !CONFIG_ARM64_SVE */ +#define opt_dom0_sve (0) + static inline register_t compute_max_zcr(void) { return 0; -- 2.34.1
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