[PATCHv2,0/4] arm64:kvm: teach guest sched that VCPUs can be preempted

Message

Sergey Senozhatsky July 9, 2021, 4:37 a.m. UTC

Hello,

This patch set adds a simple vcpu_is_preempted() implementation so
that scheduler can make better decisions when it search for the idle
(v)CPU.

For sched benchmarks please refer to [0].

[0] https://github.com/sergey-senozhatsky/arm64-vcpu_is_preempted

v2:
- 5.13 rebase (static calls, etc)
- simplified and reworked some bits

Sergey Senozhatsky (4):
  arm64: smccc: Add SMCCC pv-vcpu-state function call IDs
  arm64: add guest pvstate support
  arm64: do not use dummy vcpu_is_preempted()
  arm64: add host pv-vcpu-state support

 arch/arm64/include/asm/kvm_host.h | 23 ++++++++
 arch/arm64/include/asm/paravirt.h | 19 +++++++
 arch/arm64/include/asm/spinlock.h | 18 +++---
 arch/arm64/kernel/paravirt.c      | 94 +++++++++++++++++++++++++++++++
 arch/arm64/kernel/smp.c           |  4 ++
 arch/arm64/kvm/Makefile           |  3 +-
 arch/arm64/kvm/arm.c              |  3 +
 arch/arm64/kvm/hypercalls.c       | 11 ++++
 arch/arm64/kvm/pv-vcpu-state.c    | 64 +++++++++++++++++++++
 include/linux/arm-smccc.h         | 18 ++++++
 10 files changed, 248 insertions(+), 9 deletions(-)
 create mode 100644 arch/arm64/kvm/pv-vcpu-state.c