CVE-2022-4994

CVE-2022-4994 concerns a Linux kernel KVM/x86 issue where the fast IN path for in-kernel PIO was adjusted. The change routes fast PIO through __emulator_pio_in() directly instead of bouncing via emulator_pio_in(), since __emulator_pio_in() now fills the required value and vcpu->arch.pio.count ...