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KVM: arm64: Allow no running vcpu on restoring vgic3 LPI pending status

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We don't have a running VCPU context to restore vgic3 LPI pending status
due to command KVM_DEV_ARM_{VGIC_GRP_CTRL, ITS_RESTORE_TABLES} on KVM
device "kvm-arm-vgic-its".

Use vgic_write_guest_lock() to restore vgic3 LPI pending status.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230126235451.469087-4-gshan@redhat.com
This commit is contained in:
Gavin Shan 2023-01-27 07:54:50 +08:00 committed by Marc Zyngier
parent a23eaf9368
commit 2f8b1ad222
2 changed files with 6 additions and 4 deletions
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8
Documentation/virt/kvm/api.rst
View file

@ -8070,9 +8070,11 @@ considering the state as complete. VMM needs to ensure that the dirty
state is final and avoid missing dirty pages from another ioctl ordered
after the bitmap collection.
NOTE: One example of using the backup bitmap is saving arm64 vgic/its
tables through KVM_DEV_ARM_{VGIC_GRP_CTRL, ITS_SAVE_TABLES} command on
KVM device "kvm-arm-vgic-its" when dirty ring is enabled.
NOTE: Multiple examples of using the backup bitmap: (1) save vgic/its
tables through command KVM_DEV_ARM_{VGIC_GRP_CTRL, ITS_SAVE_TABLES} on
KVM device "kvm-arm-vgic-its". (2) restore vgic/its tables through
command KVM_DEV_ARM_{VGIC_GRP_CTRL, ITS_RESTORE_TABLES} on KVM device
"kvm-arm-vgic-its". VGICv3 LPI pending status is restored.
8.30 KVM_CAP_XEN_HVM
--------------------

2
arch/arm64/kvm/vgic/vgic-v3.c
View file

@ -339,7 +339,7 @@ int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq)
if (status) {
/* clear consumed data */
val &= ~(1 << bit_nr);
ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
ret = vgic_write_guest_lock(kvm, ptr, &val, 1);
if (ret)
return ret;
}