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irqchip/gic-v5: Populate struct gic_kvm_info

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Populate the gic_kvm_info struct based on support for
FEAT_GCIE_LEGACY.  The struct is used by KVM to probe for a compatible
GIC.

Co-authored-by: Timothy Hayes <timothy.hayes@arm.com>
Signed-off-by: Timothy Hayes <timothy.hayes@arm.com>
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Link: https://lore.kernel.org/r/20250627100847.1022515-3-sascha.bischoff@arm.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Sascha Bischoff
2025-06-27 10:09:01 +00:00
committed by Oliver Upton
parent 244e9a89ca
commit 1ec38ce3d0
2 changed files with 37 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/irqchip/irq-gic-v5.c
View File

@@ -13,6 +13,7 @@
#include <linux/irqchip.h>
#include <linux/irqchip/arm-gic-v5.h>
#include <linux/irqchip/arm-vgic-info.h>
#include <asm/cpufeature.h>
#include <asm/exception.h>
@@ -1058,6 +1059,36 @@ static void gicv5_set_cpuif_idbits(void)
}
}
#ifdef CONFIG_KVM
static struct gic_kvm_info gic_v5_kvm_info __initdata;
static bool __init gicv5_cpuif_has_gcie_legacy(void)
{
u64 idr0 = read_sysreg_s(SYS_ICC_IDR0_EL1);
return !!FIELD_GET(ICC_IDR0_EL1_GCIE_LEGACY, idr0);
}
static void __init gic_of_setup_kvm_info(struct device_node *node)
{
gic_v5_kvm_info.type = GIC_V5;
gic_v5_kvm_info.has_gcie_v3_compat = gicv5_cpuif_has_gcie_legacy();
/* GIC Virtual CPU interface maintenance interrupt */
gic_v5_kvm_info.no_maint_irq_mask = false;
gic_v5_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
if (!gic_v5_kvm_info.maint_irq) {
pr_warn("cannot find GICv5 virtual CPU interface maintenance interrupt\n");
return;
}
vgic_set_kvm_info(&gic_v5_kvm_info);
}
#else
static inline void __init gic_of_setup_kvm_info(struct device_node *node)
{
}
#endif // CONFIG_KVM
static int __init gicv5_of_init(struct device_node *node, struct device_node *parent)
{
int ret = gicv5_irs_of_probe(node);
@@ -1090,6 +1121,8 @@ static int __init gicv5_of_init(struct device_node *node, struct device_node *pa
gicv5_irs_its_probe();
gic_of_setup_kvm_info(node);
return 0;
out_int:

4
include/linux/irqchip/arm-vgic-info.h
View File

@@ -15,6 +15,8 @@ enum gic_type {
GIC_V2,
/* Full GICv3, optionally with v2 compat */
GIC_V3,
/* Full GICv5, optionally with v3 compat */
GIC_V5,
};
struct gic_kvm_info {
@@ -34,6 +36,8 @@ struct gic_kvm_info {
bool has_v4_1;
/* Deactivation impared, subpar stuff */
bool no_hw_deactivation;
/* v3 compat support (GICv5 hosts, only) */
bool has_gcie_v3_compat;
};
#ifdef CONFIG_KVM