KVM: PPC: Remove extra get_page() to fix page refcount leak

Don't manually do get_page() when patching dcbz, as gfn_to_page() gifts
the caller a reference.  I.e. doing get_page() will leak the page due to
not putting all references.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-74-seanjc@google.com>

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index d7721297b9b6e36e836947cb2be5ddd4e2d06585..cd7ab6d85090918fdffad8e4f06d55b35a7e23f2 100644 (file)
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -652,7 +652,6 @@ static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
        hpage_offset &= ~0xFFFULL;
        hpage_offset /= 4;
 
-       get_page(hpage);
        page = kmap_atomic(hpage);
 
        /* patch dcbz into reserved instruction, so we trap */