From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3qT22r6fs2zDq7K for ; Mon, 21 Mar 2016 14:52:20 +1100 (AEDT) From: David Gibson To: paulus@samba.org, aik@ozlabs.ru, benh@kernel.crashing.org Cc: bharata@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, michael@ellerman.id.au, David Gibson Subject: [RFCv3 15/17] powerpc/kvm: KVM-HV HPT resizing, preparation path Date: Mon, 21 Mar 2016 14:53:22 +1100 Message-Id: <1458532404-21258-16-git-send-email-david@gibson.dropbear.id.au> In-Reply-To: <1458532404-21258-1-git-send-email-david@gibson.dropbear.id.au> References: <1458532404-21258-1-git-send-email-david@gibson.dropbear.id.au> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This adds code to initialize an HPT resize operation, and complete its prepare phase, including allocating and clearing a tentative new HPT. It also includes corresponding code to free things afterwards. Signed-off-by: David Gibson --- arch/powerpc/kvm/book3s_64_mmu_hv.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 05e8d52..acc6dd4 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -54,6 +54,10 @@ struct kvm_resize_hpt { /* These fields protected by kvm->lock */ int error; bool prepare_done; + + /* Private to the work thread, until prepare_done is true, + * then protected by kvm->resize_hpt_sem */ + struct kvm_hpt_info hpt; }; #ifdef DEBUG_RESIZE_HPT @@ -1157,6 +1161,17 @@ void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa, */ static int resize_hpt_allocate(struct kvm_resize_hpt *resize) { + int rc; + + rc = kvmppc_allocate_hpt(&resize->hpt, resize->order); + if (rc == -ENOMEM) + return H_NO_MEM; + else if (rc < 0) + return H_HARDWARE; + + resize_hpt_debug(resize, "resize_hpt_allocate(): HPT @ 0x%lx\n", + resize->hpt.virt); + return H_SUCCESS; } @@ -1172,6 +1187,10 @@ static void resize_hpt_pivot(struct kvm_resize_hpt *resize) static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize) { BUG_ON(kvm->arch.resize_hpt != resize); + + if (resize->hpt.virt) + kvmppc_free_hpt(&resize->hpt); + kvm->arch.resize_hpt = NULL; kfree(resize); } -- 2.5.0