linux-kernel - [PATCH 1/3] KVM, SEV: Refactor out function for unregistering encrypted regions

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Date:   Mon, 21 Jun 2021 09:31:16 -0700
From:   Peter Gonda <pgonda@...gle.com>
To:     kvm@...r.kernel.org
Cc:     Peter Gonda <pgonda@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] KVM, SEV: Refactor out function for unregistering
 encrypted regions

Factor out helper function for freeing the encrypted region list.

Signed-off-by: Peter Gonda <pgonda@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Dr. David Alan Gilbert <dgilbert@...hat.com>
Cc: Brijesh Singh <brijesh.singh@....com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: Wanpeng Li <wanpengli@...cent.com>
Cc: Jim Mattson <jmattson@...gle.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org

---
 arch/x86/kvm/svm/sev.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 46e339c84998..5af46ff6ec48 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1767,11 +1767,25 @@ int svm_vm_copy_asid_from(struct kvm *kvm, unsigned int source_fd)
 	return ret;
 }
 
+static void __unregister_region_list_locked(struct kvm *kvm,
+					    struct list_head *mem_regions)
+{
+	struct enc_region *pos, *q;
+
+	lockdep_assert_held(&kvm->lock);
+
+	if (list_empty(mem_regions))
+		return;
+
+	list_for_each_entry_safe(pos, q, mem_regions, list) {
+		__unregister_enc_region_locked(kvm, pos);
+		cond_resched();
+	}
+}
+
 void sev_vm_destroy(struct kvm *kvm)
 {
 	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
-	struct list_head *head = &sev->regions_list;
-	struct list_head *pos, *q;
 
 	if (!sev_guest(kvm))
 		return;
@@ -1795,13 +1809,7 @@ void sev_vm_destroy(struct kvm *kvm)
 	 * if userspace was terminated before unregistering the memory regions
 	 * then lets unpin all the registered memory.
 	 */
-	if (!list_empty(head)) {
-		list_for_each_safe(pos, q, head) {
-			__unregister_enc_region_locked(kvm,
-				list_entry(pos, struct enc_region, list));
-			cond_resched();
-		}
-	}
+	__unregister_region_list_locked(kvm, &sev->regions_list);
 
 	mutex_unlock(&kvm->lock);
 
-- 
2.32.0.288.g62a8d224e6-goog