[PATCH 2/9] KVM: x86/mmu: Annotate tdp_enabled as being read-mostly

[Sean Christopherson]

Tag tdp_enabled with __read_mostly as the variable is only ever written
during vendor module load, same as all the other global MMU variables that
are handled by kvm_configure_mmu().

Opportunistically annotate the tdp_mmu_enabled and eager_page_split
declarations with __read_mostly, to match their definitions.  The compiler
will warn if there are conflicting annotations, i.e. there's minimal risk
of the declaration annotation becoming stale.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
 arch/x86/kvm/mmu.h     | 6 +++---
 arch/x86/kvm/mmu/mmu.c | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index c9f628b97dae..85bc503de1b6 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -6,14 +6,14 @@
 #include "regs.h"
 #include "cpuid.h"
 
-extern bool tdp_enabled;
+extern bool __read_mostly tdp_enabled;
 #ifdef CONFIG_X86_64
-extern bool tdp_mmu_enabled;
+extern bool __read_mostly tdp_mmu_enabled;
 #else
 #define tdp_mmu_enabled false
 #endif
 extern bool __read_mostly enable_mmio_caching;
-extern bool eager_page_split;
+extern bool __read_mostly eager_page_split;
 
 #define KVM_MEMSLOT_PAGES_TO_MMU_PAGES_RATIO 50
 #define KVM_MIN_ALLOC_MMU_PAGES 64UL
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 6c13da942bfc..af3820136f7c 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -104,7 +104,7 @@ module_param_named(flush_on_reuse, force_flush_and_sync_on_reuse, bool, 0644);
  * 2. while doing 1. it walks guest-physical to host-physical
  * If the hardware supports that we don't need to do shadow paging.
  */
-bool tdp_enabled = false;
+bool __read_mostly tdp_enabled = false;
 
 static bool __ro_after_init tdp_mmu_allowed;
 
-- 
2.55.0.rc0.799.gd6f94ed593-goog