The series fixes two problems in preserving vPMU counter (vPMC)
registers (PMCCNTR_EL0/PMEVCNTR<n>_EL0) during migration.
One of the problems is that KVM may not return the current values
of the vPMC registers for KVM_GET_ONE_REG.
The other one might cause KVM to reset the vPMC registers on the
first KVM_RUN on the destination. This is because userspace might
save PMCR_EL0 with PMCR_EL0.{C,P} bits set on the source, and
restore it on the destination.
See patch-1 and patch-2 for details on these issues respectively.
The series is based on v6.2.
Reiji Watanabe (2):
KVM: arm64: PMU: Fix GET_ONE_REG for vPMC regs to return the current
value
KVM: arm64: PMU: Don't save PMCR_EL0.{C,P} for the vCPU
arch/arm64/kvm/pmu-emul.c | 4 +++-
arch/arm64/kvm/sys_regs.c | 21 +++++++++++++++++++--
2 files changed, 22 insertions(+), 3 deletions(-)
base-commit: c9c3395d5e3dcc6daee66c6908354d47bf98cb0c
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2.39.2.722.g9855ee24e9-goog
