diff mbox series

[v4,06/10] KVM: x86/MMU: Factor out updating NX hugepages state for a VM

Message ID 20220411211015.3091615-7-bgardon@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: Add a cap to disable NX hugepages on a VM | expand

Commit Message

Ben Gardon April 11, 2022, 9:10 p.m. UTC 
Factor out the code to update the NX hugepages state for an individual
VM. This will be expanded in future commits to allow per-VM control of
Nx hugepages.

No functional change intended.

Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
---
 arch/x86/kvm/mmu/mmu.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 69a30d6d1e2b..caaa610b7878 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6144,6 +6144,15 @@  static void __set_nx_huge_pages(bool val)
 	nx_huge_pages = itlb_multihit_kvm_mitigation = val;
 }
 
+static void kvm_update_nx_huge_pages(struct kvm *kvm)
+{
+	mutex_lock(&kvm->slots_lock);
+	kvm_mmu_zap_all_fast(kvm);
+	mutex_unlock(&kvm->slots_lock);
+
+	wake_up_process(kvm->arch.nx_lpage_recovery_thread);
+}
+
 static int set_nx_huge_pages(const char *val, const struct kernel_param *kp)
 {
 	bool old_val = nx_huge_pages;
@@ -6166,13 +6175,9 @@  static int set_nx_huge_pages(const char *val, const struct kernel_param *kp)
 
 		mutex_lock(&kvm_lock);
 
-		list_for_each_entry(kvm, &vm_list, vm_list) {
-			mutex_lock(&kvm->slots_lock);
-			kvm_mmu_zap_all_fast(kvm);
-			mutex_unlock(&kvm->slots_lock);
+		list_for_each_entry(kvm, &vm_list, vm_list)
+			kvm_update_nx_huge_pages(kvm);
 
-			wake_up_process(kvm->arch.nx_lpage_recovery_thread);
-		}
 		mutex_unlock(&kvm_lock);
 	}