In the case (GICv2 on GICv3 migration), I did the test on my board as follow:
vm boot => migrate to destination => shutdown at destination => start at destination
=> migrate back to source ... go round and begin again;
I tested many times, but unlucky, there maybe failed by accident when shutdown the vm
at destination. (GICv3 on GICv3 migration, 1000+ times, That's OK).
while failed, we can watch the interrupts in the vm, some vcpus of the vm can not
receive the virt timer interrupt. And, these vcpus will 100% with top tool at host.
vgic_state debug file at destination shows(a active virt timer interrupt) that:
VCPU 0 TYP ID TGT_ID PLAEHC HWID TARGET SRC PRI VCPU_ID
---------------------------------------------------------------
....................
PPI 25 0 000001 0 1 0 160 -1
PPI 26 0 000001 0 1 0 160 -1
PPI 27 0 011111 27 1 0 160 0
I added log to print ICH* registers for VCPU0 at destination:
**HCR:0x1, VMCR:0xf0ec0001,SRE:0x0, ELRSR:0xe**
-----AP0R:0: 0x0------
-----AP0R:1: 0x0------
-----AP0R:2: 0x0------
-----AP0R:3: 0x0------
-----AP1R:0: 0x0------
-----AP1R:1: 0x0------
-----AP1R:2: 0x0------
-----AP1R:3: 0x0------
-----LR:0: 0xa0a0001b0000001b------
-----LR:1: 0x0------
-----LR:2: 0x0------
-----LR:3: 0x0------
and the ICH_AP1R0 value is 0x10000 at source.
At present, QEMU have supproted GICC_APRn put/set interface for emulated GICv2,
and kvm does not support the uaccess interface. This patchset try to support this.
BTW: patch 1 is untested cause I don't have the GICv2 hardware board on hand, sorry.
wanghaibin (4):
kvm: arm/arm64: vgic-v2: Add GICH_APR accessors for GICv2
kvm: arm/arm64: vgic-v3: add ICH_AP[01]Rn accessors for GICv3
kvm: arm/arm64: vgic: Implement the vGICv2 GICC_APRn uaccess
interface.
kvm: arm/arm64: vgic: clean up vGICv3 ICC_APRn sysreg uaccess
arch/arm64/kvm/vgic-sys-reg-v3.c | 25 +++++--------------------
virt/kvm/arm/vgic/vgic-mmio-v2.c | 22 ++++++++++++++++++++--
virt/kvm/arm/vgic/vgic-mmio.c | 28 ++++++++++++++++++++++++++++
virt/kvm/arm/vgic/vgic-v2.c | 21 +++++++++++++++++++++
virt/kvm/arm/vgic/vgic-v3.c | 20 ++++++++++++++++++++
virt/kvm/arm/vgic/vgic.h | 7 +++++++
6 files changed, 101 insertions(+), 22 deletions(-)
--
1.8.3.1
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