[GIT PULL v2] KVM/arm64 fixes for 6.3, part #4

[Oliver Upton <oliver.upton@linux.dev>]

Hi Paolo,

Here is v2 of the last batch of fixes for 6.3 (for real this time!)

Details in the tag, but the noteworthy addition is Dan's fix for a
rather obvious buffer overflow when writing to a firmware register.

Please pull,

Oliver

The following changes since commit e81625218bf7986ba1351a98c43d346b15601d26:

  KVM: arm64: Advertise ID_AA64PFR0_EL1.CSV2/3 to protected VMs (2023-04-04 15:52:06 +0000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git tags/kvmarm-fixes-6.3-4

for you to fetch changes up to a25bc8486f9c01c1af6b6c5657234b2eee2c39d6:

  KVM: arm64: Fix buffer overflow in kvm_arm_set_fw_reg() (2023-04-19 15:22:37 +0000)

----------------------------------------------------------------
KVM/arm64 fixes for 6.3, part #4

 - Plug a buffer overflow due to the use of the user-provided register
   width for firmware regs. Outright reject accesses where the
   user register width does not match the kernel representation.

 - Protect non-atomic RMW operations on vCPU flags against preemption,
   as an update to the flags by an intervening preemption could be lost.

----------------------------------------------------------------
Dan Carpenter (1):
      KVM: arm64: Fix buffer overflow in kvm_arm_set_fw_reg()

Marc Zyngier (1):
      KVM: arm64: Make vcpu flag updates non-preemptible

 arch/arm64/include/asm/kvm_host.h | 19 ++++++++++++++++++-
 arch/arm64/kvm/hypercalls.c       |  2 ++
 2 files changed, 20 insertions(+), 1 deletion(-)