From patchwork Thu Dec 6 15:08:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 1008865 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=citrix.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 439fxj0gBzz9s47 for ; Fri, 7 Dec 2018 02:42:49 +1100 (AEDT) Received: from localhost ([::1]:41537 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gUvna-0002Rc-87 for incoming@patchwork.ozlabs.org; Thu, 06 Dec 2018 10:42:46 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47608) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gUvXR-0006YQ-LV for qemu-devel@nongnu.org; Thu, 06 Dec 2018 10:26:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gUvHp-0005JU-OD for qemu-devel@nongnu.org; Thu, 06 Dec 2018 10:10:01 -0500 Received: from smtp03.citrix.com ([162.221.156.55]:39818) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gUvHp-0005AU-E8; Thu, 06 Dec 2018 10:09:57 -0500 X-IronPort-AV: E=Sophos;i="5.56,322,1539648000"; d="scan'208";a="72554802" From: Paul Durrant To: , , Date: Thu, 6 Dec 2018 15:08:32 +0000 Message-ID: <1544108924-10841-7-git-send-email-paul.durrant@citrix.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1544108924-10841-1-git-send-email-paul.durrant@citrix.com> References: <1544108924-10841-1-git-send-email-paul.durrant@citrix.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 162.221.156.55 Subject: [Qemu-devel] [PATCH v2 06/18] xen: add grant table interface for XenDevice-s X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paul Durrant , Stefano Stabellini Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The legacy PV backend infrastructure provides functions to map, unmap and copy pages granted by frontends. Similar functionality will be required by XenDevice implementations so this patch adds the necessary support. Signed-off-by: Paul Durrant Reviewed-by: Anthony Perard --- Cc: Stefano Stabellini --- hw/xen/xen-bus.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++ include/hw/xen/xen-bus.h | 25 ++++++++ 2 files changed, 171 insertions(+) diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c index f0732f8..b40dc83 100644 --- a/hw/xen/xen-bus.c +++ b/hw/xen/xen-bus.c @@ -489,6 +489,138 @@ static void xen_device_frontend_destroy(XenDevice *xendev) } } +void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs, + Error **errp) +{ + if (xengnttab_set_max_grants(xendev->xgth, nr_refs)) { + error_setg_errno(errp, errno, "xengnttab_set_max_grants failed"); + } +} + +void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs, + unsigned int nr_refs, int prot, + Error **errp) +{ + void *map = xengnttab_map_domain_grant_refs(xendev->xgth, nr_refs, + xendev->frontend_id, refs, + prot); + + if (!map) { + error_setg_errno(errp, errno, + "xengnttab_map_domain_grant_refs failed"); + } + + return map; +} + +void xen_device_unmap_grant_refs(XenDevice *xendev, void *map, + unsigned int nr_refs, Error **errp) +{ + if (xengnttab_unmap(xendev->xgth, map, nr_refs)) { + error_setg_errno(errp, errno, "xengnttab_unmap failed"); + } +} + +static void compat_copy_grant_refs(XenDevice *xendev, bool to_domain, + XenDeviceGrantCopySegment segs[], + unsigned int nr_segs, Error **errp) +{ + uint32_t *refs = g_new(uint32_t, nr_segs); + int prot = to_domain ? PROT_WRITE : PROT_READ; + void *map; + unsigned int i; + + for (i = 0; i < nr_segs; i++) { + XenDeviceGrantCopySegment *seg = &segs[i]; + + refs[i] = to_domain ? seg->dest.foreign.ref : + seg->source.foreign.ref; + } + + map = xengnttab_map_domain_grant_refs(xendev->xgth, nr_segs, + xendev->frontend_id, refs, + prot); + if (!map) { + error_setg_errno(errp, errno, + "xengnttab_map_domain_grant_refs failed"); + goto done; + } + + for (i = 0; i < nr_segs; i++) { + XenDeviceGrantCopySegment *seg = &segs[i]; + void *page = map + (i * XC_PAGE_SIZE); + + if (to_domain) { + memcpy(page + seg->dest.foreign.offset, seg->source.virt, + seg->len); + } else { + memcpy(seg->dest.virt, page + seg->source.foreign.offset, + seg->len); + } + } + + if (xengnttab_unmap(xendev->xgth, map, nr_segs)) { + error_setg_errno(errp, errno, "xengnttab_unmap failed"); + } + +done: + g_free(refs); +} + +void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain, + XenDeviceGrantCopySegment segs[], + unsigned int nr_segs, Error **errp) +{ + xengnttab_grant_copy_segment_t *xengnttab_segs; + unsigned int i; + + if (!xendev->feature_grant_copy) { + compat_copy_grant_refs(xendev, to_domain, segs, nr_segs, errp); + return; + } + + xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs); + + for (i = 0; i < nr_segs; i++) { + XenDeviceGrantCopySegment *seg = &segs[i]; + xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i]; + + if (to_domain) { + xengnttab_seg->flags = GNTCOPY_dest_gref; + xengnttab_seg->dest.foreign.domid = xendev->frontend_id; + xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref; + xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset; + xengnttab_seg->source.virt = seg->source.virt; + } else { + xengnttab_seg->flags = GNTCOPY_source_gref; + xengnttab_seg->source.foreign.domid = xendev->frontend_id; + xengnttab_seg->source.foreign.ref = seg->source.foreign.ref; + xengnttab_seg->source.foreign.offset = + seg->source.foreign.offset; + xengnttab_seg->dest.virt = seg->dest.virt; + } + + xengnttab_seg->len = seg->len; + } + + if (xengnttab_grant_copy(xendev->xgth, nr_segs, xengnttab_segs)) { + error_setg_errno(errp, errno, "xengnttab_grant_copy failed"); + goto done; + } + + for (i = 0; i < nr_segs; i++) { + xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i]; + + if (xengnttab_seg->status != GNTST_okay) { + error_setg(errp, "xengnttab_grant_copy seg[%u] failed", i); + break; + } + } + +done: + g_free(xengnttab_segs); +} + static void xen_device_unrealize(DeviceState *dev, Error **errp) { XenDevice *xendev = XEN_DEVICE(dev); @@ -517,6 +649,11 @@ static void xen_device_unrealize(DeviceState *dev, Error **errp) xen_device_frontend_destroy(xendev); xen_device_backend_destroy(xendev); + if (xendev->xgth) { + xengnttab_close(xendev->xgth); + xendev->xgth = NULL; + } + g_free(xendev->name); xendev->name = NULL; } @@ -559,6 +696,15 @@ static void xen_device_realize(DeviceState *dev, Error **errp) trace_xen_device_realize(type, xendev->name); + xendev->xgth = xengnttab_open(NULL, 0); + if (!xendev->xgth) { + error_setg_errno(errp, errno, "failed xengnttab_open"); + goto unrealize; + } + + xendev->feature_grant_copy = + (xengnttab_grant_copy(xendev->xgth, 0, NULL) == 0); + xen_device_backend_create(xendev, &local_err); if (local_err) { error_propagate(errp, local_err); diff --git a/include/hw/xen/xen-bus.h b/include/hw/xen/xen-bus.h index df73674..63a09b6 100644 --- a/include/hw/xen/xen-bus.h +++ b/include/hw/xen/xen-bus.h @@ -24,6 +24,8 @@ typedef struct XenDevice { enum xenbus_state backend_state, frontend_state; Notifier exit; XenWatch *frontend_state_watch; + xengnttab_handle *xgth; + bool feature_grant_copy; } XenDevice; typedef char *(*XenDeviceGetName)(XenDevice *xendev, Error **errp); @@ -79,4 +81,27 @@ void xen_device_backend_set_state(XenDevice *xendev, enum xenbus_state state); enum xenbus_state xen_device_backend_get_state(XenDevice *xendev); +void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs, + Error **errp); +void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs, + unsigned int nr_refs, int prot, + Error **errp); +void xen_device_unmap_grant_refs(XenDevice *xendev, void *map, + unsigned int nr_refs, Error **errp); + +typedef struct XenDeviceGrantCopySegment { + union { + void *virt; + struct { + uint32_t ref; + off_t offset; + } foreign; + } source, dest; + size_t len; +} XenDeviceGrantCopySegment; + +void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain, + XenDeviceGrantCopySegment segs[], + unsigned int nr_segs, Error **errp); + #endif /* HW_XEN_BUS_H */