korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-02 08:34:20 +08:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
This commit is contained in:
Shenming Lu 2021-03-22 14:01:55 +08:00 committed by Marc Zyngier
parent c21bc068cd
commit 80317fe4a6
2 changed files with 20 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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