From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753643Ab1AJKgk (ORCPT ); Mon, 10 Jan 2011 05:36:40 -0500 Received: from smtp02.citrix.com ([66.165.176.63]:36877 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753600Ab1AJKfz (ORCPT ); Mon, 10 Jan 2011 05:35:55 -0500 X-IronPort-AV: E=Sophos;i="4.60,299,1291611600"; d="scan'208";a="130293799" From: stefano.stabellini@eu.citrix.com To: linux-kernel@vger.kernel.org Cc: xen-devel@lists.xensource.com, Jeremy.Fitzhardinge@citrix.com, konrad.wilk@oracle.com, Stefano Stabellini , Jeremy Fitzhardinge Subject: [PATCH 10/12] xen: introduce gnttab_map_refs and gnttab_unmap_refs Date: Mon, 10 Jan 2011 10:36:39 +0000 Message-Id: <1294655801-16230-10-git-send-email-stefano.stabellini@eu.citrix.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: References: X-OriginalArrivalTime: 10 Jan 2011 10:35:55.0299 (UTC) FILETIME=[29411730:01CBB0B2] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stefano Stabellini gnttab_map_refs maps some grant refs and uses the new m2p override to set a proper m2p mapping for the granted pages. gnttab_unmap_refs unmaps the granted refs and removes th mappings from the m2p override. Signed-off-by: Stefano Stabellini Signed-off-by: Jeremy Fitzhardinge --- drivers/xen/grant-table.c | 36 ++++++++++++++++++++++++++++++++++++ include/xen/grant_table.h | 5 +++++ 2 files changed, 41 insertions(+), 0 deletions(-) diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 6c45318..1afd569 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -447,6 +447,42 @@ unsigned int gnttab_max_grant_frames(void) } EXPORT_SYMBOL_GPL(gnttab_max_grant_frames); +int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, + struct page **pages, unsigned int count) +{ + int i, ret; + pte_t *pte; + unsigned long mfn; + + ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count); + + for (i = 0; i < count; i++) { + /* m2p override only supported for GNTMAP_contains_pte mappings */ + if (!(map_ops[i].flags & GNTMAP_contains_pte)) + continue; + pte = (pte_t *) (mfn_to_virt(PFN_DOWN(map_ops[i].host_addr)) + + (map_ops[i].host_addr & ~PAGE_MASK)); + mfn = pte_mfn(*pte); + m2p_add_override(mfn, pages[i]); + } + + return ret; +} +EXPORT_SYMBOL_GPL(gnttab_map_refs); + +int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, + struct page **pages, unsigned int count) +{ + int i, ret; + + ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count); + for (i = 0; i < count; i++) + m2p_remove_override(pages[i]); + + return ret; +} +EXPORT_SYMBOL_GPL(gnttab_unmap_refs); + static int gnttab_map(unsigned int start_idx, unsigned int end_idx) { struct gnttab_setup_table setup; diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h index 1821aa1..b1fab6b 100644 --- a/include/xen/grant_table.h +++ b/include/xen/grant_table.h @@ -155,4 +155,9 @@ unsigned int gnttab_max_grant_frames(void); #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr)) +int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, + struct page **pages, unsigned int count); +int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, + struct page **pages, unsigned int count); + #endif /* __ASM_GNTTAB_H__ */ -- 1.5.6.5