[0/5] KVM: arm/arm64: Fix VCPU power management problems

Message

Christoffer Dall Jan. 25, 2019, 9:46 a.m. UTC

This series fixes a number of issues:

 - When powering on and resetting VCPUs, we can be preempted in the
   middle which can lead to guest system register corruption.

 - We were missing support for PSCI ON_PENDING when multiple VCPUs try
   to turn on a target VCPU at the same time.

 - Powering off a VCPU could race with powering on the same VCPU.

 - We unnecesarily panic'ed if we found a non-initialized guest system
   register.

The main approach to fixing all these problems is by using VCPU
requests.

See the individual patches for more details.

Christoffer Dall (3):
  KVM: arm/arm64: Reset the VCPU without preemption and vcpu state
    loaded
  KVM: arm/arm64: Require VCPU threads to turn them self off
  KVM: arm/arm64: Implement PSCI ON_PENDING when turning on VCPUs

Marc Zyngier (2):
  arm/arm64: KVM: Allow a VCPU to fully reset itself
  arm/arm64: KVM: Don't panic on failure to properly reset system
    registers

 arch/arm/include/asm/kvm_host.h   | 22 ++++++++++-
 arch/arm/kvm/coproc.c             |  4 +-
 arch/arm/kvm/reset.c              | 24 ++++++++++++
 arch/arm64/include/asm/kvm_host.h | 23 ++++++++++-
 arch/arm64/kvm/reset.c            | 50 +++++++++++++++++++++++-
 arch/arm64/kvm/sys_regs.c         |  4 +-
 virt/kvm/arm/arm.c                | 40 ++++++++++++++-----
 virt/kvm/arm/psci.c               | 64 +++++++++++++++----------------
 8 files changed, 177 insertions(+), 54 deletions(-)