GIC CPU interfaces versions predating GIC v4.1 were not built to accommodate vINTID within the vSGI range; as reported in the GIC specifications (8.2 "Changes to the CPU interface"), it is CONSTRAINED UNPREDICTABLE to deliver a vSGI to a PE with ID_AA64PFR0_EL1.GIC == b0001.
Check the GIC CPUIF version through the arm64 capabilities infrastructure and disable vSGIs if a CPUIF version < 4.1 is detected to prevent using vSGIs on systems where they may misbehave. Signed-off-by: Lorenzo Pieralisi <[email protected]> Cc: Marc Zyngier <[email protected]> --- drivers/irqchip/irq-gic-v3-its.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 0fec31931e11..6ed4ba60ba7e 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -39,6 +39,20 @@ #include "irq-gic-common.h" +#ifdef CONFIG_ARM64 +#include <asm/cpufeature.h> + +static inline bool gic_cpuif_has_vsgi(void) +{ + return cpus_have_const_cap(ARM64_HAS_GIC_CPUIF_VSGI); +} +#else +static inline bool gic_cpuif_has_vsgi(void) +{ + return false; +} +#endif + #define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1ULL << 0) #define ITS_FLAGS_WORKAROUND_CAVIUM_22375 (1ULL << 1) #define ITS_FLAGS_WORKAROUND_CAVIUM_23144 (1ULL << 2) @@ -5415,7 +5429,11 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists, if (has_v4 & rdists->has_vlpis) { const struct irq_domain_ops *sgi_ops; - if (has_v4_1) + /* + * Enable vSGIs only if the ITS and the + * GIC CPUIF support them. + */ + if (has_v4_1 && gic_cpuif_has_vsgi()) sgi_ops = &its_sgi_domain_ops; else sgi_ops = NULL; -- 2.29.1
