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

Message

Marc Zyngier Nov. 3, 2020, 5:14 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.

Marc Zyngier (3):
  KVM: arm64: Allow setting of ID_AA64PFR0_EL1.CSV2 from userspace
  KVM: arm64: Rename access_amu() to undef_access()
  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         | 70 +++++++++++++++++++++++--------
 4 files changed, 74 insertions(+), 18 deletions(-)