mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-13 15:19:26 -04:00
1c932fc762
When lockdep is enabled, assert that KVM accesses the register caches if and only if cache fills are guaranteed to consume fresh data, i.e. when KVM when KVM is in control of the code sequence. Concretely, the caches can only be used from task context (synchronous) or when handling a PMI VM-Exit (asynchronous, but only in specific windows where the caches are in a known, stable state). Generally speaking, there are very few flows where reading register state from an asynchronous context is correct or even necessary. So, rather than trying to figure out a generic solution, simply disallow using the caches outside of task context by default, and deal with any future exceptions on a case-by-case basis _if_ they arise. Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Link: https://lore.kernel.org/r/20241009175002.1118178-4-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>