Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753175AbbGMUOV (ORCPT ); Mon, 13 Jul 2015 16:14:21 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:27491 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753138AbbGMUOT (ORCPT ); Mon, 13 Jul 2015 16:14:19 -0400 Message-ID: <55A41BE4.3080104@oracle.com> Date: Mon, 13 Jul 2015 16:13:24 -0400 From: Boris Ostrovsky User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: Julien Grall , xen-devel@lists.xenproject.org CC: linux-arm-kernel@lists.infradead.org, ian.campbell@citrix.com, stefano.stabellini@eu.citrix.com, linux-kernel@vger.kernel.org, Konrad Rzeszutek Wilk , David Vrabel Subject: Re: [PATCH v2 19/20] xen/privcmd: Add support for Linux 64KB page granularity References: <1436474552-31789-1-git-send-email-julien.grall@citrix.com> <1436474552-31789-20-git-send-email-julien.grall@citrix.com> In-Reply-To: <1436474552-31789-20-git-send-email-julien.grall@citrix.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1421 Lines: 52 On 07/09/2015 04:42 PM, Julien Grall wrote: > - > struct remap_data { > xen_pfn_t *fgmfn; /* foreign domain's gmfn */ > + xen_pfn_t *efgmfn; /* pointer to the end of the fgmfn array */ It might be better to keep size of fgmfn array instead. > > +static int unmap_gfn(struct page *page, unsigned long pfn, void *data) > +{ > + int *nr = data; > + struct xen_remove_from_physmap xrp; > + > + /* The Linux Page may not have been fully mapped to Xen */ > + if (!*nr) > + return 0; > + > + xrp.domid = DOMID_SELF; > + xrp.gpfn = pfn; > + (void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp); > + > + (*nr)--; > + > + return 0; > +} > + > int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma, > int nr, struct page **pages) > { > int i; > + int nr_page = round_up(nr, XEN_PFN_PER_PAGE); > > - for (i = 0; i < nr; i++) { > - struct xen_remove_from_physmap xrp; > - unsigned long pfn; > + for (i = 0; i < nr_page; i++) { > + /* unmap_gfn guarantees ret == 0 */ > + BUG_ON(xen_apply_to_page(pages[i], unmap_gfn, &nr)); TBH, I am not sure how useful xen_apply_to_page() routine is. In this patch especially, but also in others. -boris -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/