[PATCH v9 12/43] KVM: arm64: vgic: Provide helper for number of list registers
STALE412d
REVIEWED: 1 (0M)
From: Steven Price <steven.price@arm.com>
Date: 2025-06-11 10:49:46
Also in:
kvm, kvmarm, linux-coco, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Revision v9 of 15 in this series; 1 review trailer.
Revisions (15)
- rfc [diff vs current]
- v2 [diff vs current]
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- v8 [diff vs current]
- v9 current
- v10 [diff vs current]
- v12 [diff vs current]
- v13 [diff vs current]
- v14 [diff vs current]
- v15 [diff vs current]
- v16 [diff vs current]
Currently the number of list registers available is stored in a global (kvm_vgic_global_state.nr_lr). With Arm CCA the RMM is permitted to reserve list registers for its own use and so the number of available list registers can be fewer for a realm VM. Provide a wrapper function to fetch the global in preparation for restricting nr_lr when dealing with a realm VM. Reviewed-by: Gavin Shan <redacted> Signed-off-by: Steven Price <steven.price@arm.com> --- New patch for v6 --- arch/arm64/kvm/vgic/vgic.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c
index 8f8096d48925..c7aed48c5668 100644
--- a/arch/arm64/kvm/vgic/vgic.c
+++ b/arch/arm64/kvm/vgic/vgic.c@@ -21,6 +21,11 @@ struct vgic_global kvm_vgic_global_state __ro_after_init = { .gicv3_cpuif = STATIC_KEY_FALSE_INIT, }; +static inline int kvm_vcpu_vgic_nr_lr(struct kvm_vcpu *vcpu) +{ + return kvm_vgic_global_state.nr_lr; +} + /* * Locking order is always: * kvm->lock (mutex)
@@ -802,7 +807,7 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) lockdep_assert_held(&vgic_cpu->ap_list_lock); count = compute_ap_list_depth(vcpu, &multi_sgi); - if (count > kvm_vgic_global_state.nr_lr || multi_sgi) + if (count > kvm_vcpu_vgic_nr_lr(vcpu) || multi_sgi) vgic_sort_ap_list(vcpu); count = 0;
@@ -831,7 +836,7 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) raw_spin_unlock(&irq->irq_lock); - if (count == kvm_vgic_global_state.nr_lr) { + if (count == kvm_vcpu_vgic_nr_lr(vcpu)) { if (!list_is_last(&irq->ap_list, &vgic_cpu->ap_list_head)) vgic_set_underflow(vcpu);
@@ -840,7 +845,7 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) } /* Nuke remaining LRs */ - for (i = count ; i < kvm_vgic_global_state.nr_lr; i++) + for (i = count; i < kvm_vcpu_vgic_nr_lr(vcpu); i++) vgic_clear_lr(vcpu, i); if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
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2.43.0