KVM: x86: Carve out common dirty logging update

Move the PML enable/disable decision logic from the VMX into a new
common wrapper kvm_update_cpu_dirty_logging() in x86.c to avoid
code duplication. Update the update_cpu_dirty_logging() signature to
accept a bool enable parameter accordingly.

Note, this subtly changes the ordering for VMX: currently
guard(vmx_vmcs01) is taken before the atomic_read of
nr_memslots_dirty_logging; after this refactoring the atomic_read
happens in common code before guard(vmx_vmcs01) is taken. The ordering
flip is harmless as a concurrent change to nr_memslots_dirty_logging
will queue another update request.

No functional change intended for VMX, restructuring to prepare for SVM
PML support.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
Link: https://patch.msgid.link/20260907063906.1964557-6-nikunj@amd.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions