On 2023/1/27 07:54, Gavin Shan wrote:
We don't have a running VCPU context to save vgic3 pending table due
to KVM_DEV_ARM_VGIC_{GRP_CTRL, SAVE_PENDING_TABLES} command on KVM
device "kvm-arm-vgic-v3". The unknown case is caught by kvm-unit-tests.
# ./kvm-unit-tests/tests/its-pending-migration
WARNING: CPU: 120 PID: 7973 at arch/arm64/kvm/../../../virt/kvm/kvm_main.c:3325 \
mark_page_dirty_in_slot+0x60/0xe0
:
mark_page_dirty_in_slot+0x60/0xe0
__kvm_write_guest_page+0xcc/0x100
kvm_write_guest+0x7c/0xb0
vgic_v3_save_pending_tables+0x148/0x2a0
vgic_set_common_attr+0x158/0x240
vgic_v3_set_attr+0x4c/0x5c
kvm_device_ioctl+0x100/0x160
__arm64_sys_ioctl+0xa8/0xf0
invoke_syscall.constprop.0+0x7c/0xd0
el0_svc_common.constprop.0+0x144/0x160
do_el0_svc+0x34/0x60
el0_svc+0x3c/0x1a0
el0t_64_sync_handler+0xb4/0x130
el0t_64_sync+0x178/0x17c
Use vgic_write_guest_lock() to save vgic3 pending table.
Reported-by: Zenghui Yu <yuzenghui@xxxxxxxxxx>
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
Reviewed-by: Oliver Upton <oliver.upton@xxxxxxxxx>
---
Documentation/virt/kvm/api.rst | 4 +++-
arch/arm64/kvm/vgic/vgic-v3.c | 2 +-
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 40ada313faa3..07f07668995e 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -8074,7 +8074,9 @@ 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". vgic3 LPI pending status is restored.
+"kvm-arm-vgic-its". vgic3 LPI pending status is restored. (3) save
+vgic3 pending table through KVM_DEV_ARM_VGIC_{GRP_CTRL, SAVE_PENDING_TABLES}
+command on KVM device "kvm-arm-vgic-v3".
Can we summarize these 3 examples with something like: "when the guest
memory (pending tables, ITS tables, etc) is dirtied by the virtual GIC
or ITS, which is typically triggered by a userspace request (e.g.,
KVM_DEV_ARM_ITS_SAVE_TABLES) and doesn't require a running VCPU
context"? In case there will be more no-running-vcpu
kvm_write_guest_lock() cases in the VGIC emulation code in future and we
have to extend the documentation..
But I don't have objection to your writing and the whole series looks
good.
Thanks,
Zenghui
