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[v2,0/3] KVM: arm64: Another set of CSV2-related fixes

Message ID 20201110141308.451654-1-maz@kernel.org (mailing list archive)
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Series KVM: arm64: Another set of CSV2-related fixes | expand


Marc Zyngier Nov. 10, 2020, 2:13 p.m. UTC
This small series addresses a couple of Spectre-v2 related issues:

- Fix a live migration regression introduced with the setting of CSV2
  on systems that are not affected by Spectre-v2, but that don't
  directly expose it in ID_AA64PFR0_EL1

- Inject an UNDEF exception if the guest tries to access any of
  SCXTNUM_ELx, as we don't advertise it to guests.

Patches on top of 5.10-rc2.

* From v1:
  - Only register a new value for CSV2 on a valid write to ID_AA64PFR0_EL1
  - Delete even more code in patch #2

Marc Zyngier (3):
  KVM: arm64: Allow setting of ID_AA64PFR0_EL1.CSV2 from userspace
  KVM: arm64: Unify trap handlers injecting an UNDEF
  KVM: arm64: Handle SCXTNUM_ELx traps

 arch/arm64/include/asm/kvm_host.h |   2 +
 arch/arm64/include/asm/sysreg.h   |   4 ++
 arch/arm64/kvm/arm.c              |  16 +++++
 arch/arm64/kvm/sys_regs.c         | 111 ++++++++++++++++++------------
 4 files changed, 89 insertions(+), 44 deletions(-)