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UPSTREAM: KVM: arm64: GICv4.1: Add function to get VLPI state

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With GICv4.1 and the vPE unmapped, which indicates the invalidation
of any VPT caches associated with the vPE, we can get the VLPI state
by peeking at the VPT. So we add a function for this.

Signed-off-by: Shenming Lu <lushenming@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210322060158.1584-4-lushenming@huawei.com
(cherry picked from commit 80317fe4a6)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 190594147
Change-Id: I1816d16525bb17962761e0caa683a72dbca6bf3e
This commit is contained in:
Shenming Lu
2021-03-22 14:01:55 +08:00
committed by Will Deacon
parent 46c27765a2
commit 89cb7159f5
2 changed files with 20 additions and 0 deletions
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19
arch/arm64/kvm/vgic/vgic-v4.c
View File

@@ -203,6 +203,25 @@ void vgic_v4_configure_vsgis(struct kvm *kvm)
kvm_arm_resume_guest(kvm);
}
/*
* Must be called with GICv4.1 and the vPE unmapped, which
* indicates the invalidation of any VPT caches associated
* with the vPE, thus we can get the VLPI state by peeking
* at the VPT.
*/
void vgic_v4_get_vlpi_state(struct vgic_irq *irq, bool *val)
{
struct its_vpe *vpe = &irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
int mask = BIT(irq->intid % BITS_PER_BYTE);
void *va;
u8 *ptr;
va = page_address(vpe->vpt_page);
ptr = va + irq->intid / BITS_PER_BYTE;
*val = !!(*ptr & mask);
}
/**
* vgic_v4_init - Initialize the GICv4 data structures
* @kvm: Pointer to the VM being initialized

1
arch/arm64/kvm/vgic/vgic.h
View File

@@ -317,5 +317,6 @@ bool vgic_supports_direct_msis(struct kvm *kvm);
int vgic_v4_init(struct kvm *kvm);
void vgic_v4_teardown(struct kvm *kvm);
void vgic_v4_configure_vsgis(struct kvm *kvm);
void vgic_v4_get_vlpi_state(struct vgic_irq *irq, bool *val);
#endif