KVM: x86: Force TLB flush on userspace changes to special registers

KVM: x86: Force TLB flush on userspace changes to special registers

Userspace can directly modify the content of vCPU's CR0, CR3, and CR4 via
KVM_SYNC_X86_SREGS and KVM_SET_SREGS{,2}. Make sure that KVM flushes guest
TLB entries and paging-structure caches if a (partial) guest TLB flush is
architecturally required based on the CRn changes.  To keep things simple,
flush whenever KVM resets the MMU context, i.e. if any bits in CR0, CR3,
CR4, or EFER are modified.  This is extreme overkill, but stuffing state
from userspace is not such a hot path that preserving guest TLB state is a
priority.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Link: https://lore.kernel.org/r/20230814222358.707877-3-mhal@rbox.co
[sean: call out that the flushing on MMU context resets is for simplicity]
Signed-off-by: Sean Christopherson <seanjc@google.com>