CVE-2025-71104 KVM: x86: Fix VM hard lockup after prolonged inactivity with periodic HV timer

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix VM hard lockup after prolonged inactivity with periodic HV timer When advancing the target expiration for the guest's APIC timer in periodic mode, set the expiration to "now" if the target expiration is in the past...

Hardware timer context is not properly context switched on ARM

ISSUE DESCRIPTION When running on an ARM platform Xen was not context switching the CNTKCTLEL1 register, which is used by the guest kernel to control access by userspace processes to the hardware timers. This meant that any guest can reconfigure these settings for the entire system. IMPACT A...