linux-kernel - [PATCH v6 11/22] KVM: x86: Free arrays for old memslot when moving memslot's base gfn

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Date:   Tue, 18 Feb 2020 13:07:25 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        Christoffer Dall <christoffer.dall@....com>,
        Peter Xu <peterx@...hat.com>,
        Philippe Mathieu-Daudé <f4bug@...at.org>
Subject: [PATCH v6 11/22] KVM: x86: Free arrays for old memslot when moving memslot's base gfn

Explicitly free the metadata arrays (stored in slot->arch) in the old
memslot structure when moving the memslot's base gfn is committed.  This
eliminates x86's dependency on kvm_free_memslot() being called when a
memlsot move is committed, and paves the way for removing the funky code
in kvm_free_memslot() that conditionally frees structures based on its
@dont param.

Reviewed-by: Peter Xu <peterx@...hat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/x86.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4f1da1712a61..b8ee55800c9d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10045,6 +10045,10 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 	 */
 	if (change != KVM_MR_DELETE)
 		kvm_mmu_slot_apply_flags(kvm, (struct kvm_memory_slot *) new);
+
+	/* Free the arrays associated with the old memslot. */
+	if (change == KVM_MR_MOVE)
+		kvm_arch_free_memslot(kvm, old, NULL);
 }
 
 void kvm_arch_flush_shadow_all(struct kvm *kvm)
-- 
2.24.1