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[v3,0/4] KVM: arm64: Do not communicate host pmu event changes by accessing hyp data

Message ID 20220509120330.3043773-1-tabba@google.com (mailing list archive)
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Series KVM: arm64: Do not communicate host pmu event changes by accessing hyp data | expand

Message

Fuad Tabba May 9, 2022, 12:03 p.m. UTC 
Hi,

This series changes the way KVM communicates host pmu event changes to the
hypervisor in nvhe and protected mode. Instead of accessing hyp data directly
from the host, the data is passed to hyp via the loaded vcpu. This provides
more isolation between the host and the hypervisor, and allows us to use pmu in
protected mode.

This series is based on kvmarm/next (8c22fd2d4cfa).

Changes since V2 [1]:
- Update the guest view of the pmu events after interrupts have been disabled

Changes since V1 [2]:
- Repack struct kvm_pmu to remove all (two) holes
- Updating the guest's view of the pmu events before every vcpu run rather than
vcpu load to avoid missing updates

Thanks,
/fuad

[1] https://lore.kernel.org/all/20220509095500.2408785-1-tabba@google.com/
[2] https://lore.kernel.org/linux-arm-kernel/20220408084052.3310931-1-tabba@google.com/

Fuad Tabba (4):
  KVM: arm64: Wrapper for getting pmu_events
  KVM: arm64: Repack struct kvm_pmu to reduce size
  KVM: arm64: Pass pmu events to hyp via vcpu
  KVM: arm64: Reenable pmu in Protected Mode

 arch/arm64/include/asm/kvm_host.h |  8 ++-----
 arch/arm64/kvm/arm.c              | 15 ++++++++++++
 arch/arm64/kvm/hyp/nvhe/switch.c  | 20 +++++-----------
 arch/arm64/kvm/pmu-emul.c         |  3 +--
 arch/arm64/kvm/pmu.c              | 40 ++++++++++++++++++-------------
 include/kvm/arm_pmu.h             | 10 ++++++--
 6 files changed, 55 insertions(+), 41 deletions(-)


base-commit: 8c22fd2d4cfaab2ae3c5859496c894df58ab014b