From patchwork Tue Mar 21 18:27:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 9637293 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A6AEA6020B for ; Tue, 21 Mar 2017 18:30:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9D6E128304 for ; Tue, 21 Mar 2017 18:30:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 925222833B; Tue, 21 Mar 2017 18:30:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0001428304 for ; Tue, 21 Mar 2017 18:30:32 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cqOVn-00026B-A5; Tue, 21 Mar 2017 18:28:03 +0000 Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cqOVm-000265-4T for xen-devel@lists.xenproject.org; Tue, 21 Mar 2017 18:28:02 +0000 Received: from [85.158.139.211] by server-10.bemta-5.messagelabs.com id 14/84-02186-1B071D85; Tue, 21 Mar 2017 18:28:01 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrDLMWRWlGSWpSXmKPExsXitHRDpO6Ggos RBo+Wm1t83zKZyYHR4/CHKywBjFGsmXlJ+RUJrBk3j65hLdirXdHz4zxbA2O/UhcjB4eEgL9E xyTLLkZODjYBHYmpTy+xgtgiArYS/d+/A9lcHMwCqxglWh/cYwNJCAu4Sfz/vIQJpJdFQFXiT K8VSJgXKPxu8V5GEFtCQE7i/PGfzCC2kICKxPqps9ggagQlTs58wgJiMwtISBx88YJ5AiP3LC SpWUhSCxiZVjFqFKcWlaUW6RpZ6iUVZaZnlOQmZuboGhqY6uWmFhcnpqfmJCYV6yXn525iBIZ CPQMD4w7Gy1v8DjFKcjApifImOl2MEOJLyk+pzEgszogvKs1JLT7EKMPBoSTBuz4fKCdYlJqe WpGWmQMMSpi0BAePkgjvX5A0b3FBYm5xZjpE6hSjopQ47z6QhABIIqM0D64NFgmXGGWlhHkZG RgYhHgKUotyM0tQ5V8xinMwKgnzzgOZwpOZVwI3/RXQYiagxWV7LoAsLklESEk1MLpcElwpXM ZwRti4yUG/aUuPyJO9a5Q/egqcCJHx3cSSmHnsulflvO7ri4WXa5rN07g1ZeJNIUWu5C8J/d5 uV5Sk3t5cpsz4sDpx3vXXn5kOpgb6nPmjlDdv444pvjqB0Wc15lns41by37Wn98oBLoaAjQJx TyYcfv91x5y1+5mSp1bsUORd1KfEUpyRaKjFXFScCADnu/HffwIAAA== X-Env-Sender: prvs=246d8669f=Paul.Durrant@citrix.com X-Msg-Ref: server-2.tower-206.messagelabs.com!1490120879!70045176!1 X-Originating-IP: [66.165.176.89] X-SpamReason: No, hits=0.0 required=7.0 tests=sa_preprocessor: VHJ1c3RlZCBJUDogNjYuMTY1LjE3Ni44OSA9PiAyMDMwMDc=\n, received_headers: No Received headers X-StarScan-Received: X-StarScan-Version: 9.2.3; banners=-,-,- X-VirusChecked: Checked Received: (qmail 64674 invoked from network); 21 Mar 2017 18:28:00 -0000 Received: from smtp.citrix.com (HELO SMTP.CITRIX.COM) (66.165.176.89) by server-2.tower-206.messagelabs.com with RC4-SHA encrypted SMTP; 21 Mar 2017 18:28:00 -0000 X-IronPort-AV: E=Sophos;i="5.36,200,1486425600"; d="scan'208";a="415256658" From: Paul Durrant To: , Date: Tue, 21 Mar 2017 18:27:57 +0000 Message-ID: <1490120877-3731-1-git-send-email-paul.durrant@citrix.com> X-Mailer: git-send-email 2.1.4 MIME-Version: 1.0 Cc: Anthony Perard , Paolo Bonzini , Paul Durrant , Stefano Stabellini Subject: [Xen-devel] [PATCH v3] xen: use libxendevice model to restrict operations X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a command-line option (-xen-domid-restrict) which will use the new libxendevicemodel API to restrict devicemodel [1] operations to the specified domid. (Such operations are not applicable to the xenpv machine type). This patch also adds a tracepoint to allow successful enabling of the restriction to be monitored. [1] I.e. operations issued by libxendevicemodel. Operation issued by other xen libraries (e.g. libxenforeignmemory) are currently still unrestricted but this will be rectified by subsequent patches. Signed-off-by: Paul Durrant --- Cc: Stefano Stabellini Cc: Anthony Perard Cc: Paolo Bonzini NOTE: This is already re-based on Juergen Gross's patch "xen: use 5 digit xen versions" and so should not be applied until after that patch has been applied. v2: - Log errno in tracepoint --- hw/xen/trace-events | 1 + include/hw/xen/xen.h | 1 + include/hw/xen/xen_common.h | 20 ++++++++++++++++++++ qemu-options.hx | 7 +++++++ vl.c | 8 ++++++++ xen-hvm.c | 8 ++++++++ 6 files changed, 45 insertions(+) diff --git a/hw/xen/trace-events b/hw/xen/trace-events index c4fb6f1..5615dce 100644 --- a/hw/xen/trace-events +++ b/hw/xen/trace-events @@ -11,3 +11,4 @@ xen_map_portio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: % xen_unmap_portio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: %u start: %#"PRIx64" end: %#"PRIx64 xen_map_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u bdf: %02x.%02x.%02x" xen_unmap_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u bdf: %02x.%02x.%02x" +xen_domid_restrict(int err) "err: %u" diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h index 2b1733b..7efcdaa 100644 --- a/include/hw/xen/xen.h +++ b/include/hw/xen/xen.h @@ -21,6 +21,7 @@ enum xen_mode { extern uint32_t xen_domid; extern enum xen_mode xen_mode; +extern bool xen_domid_restrict; extern bool xen_allowed; diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h index df098c7..4f3bd35 100644 --- a/include/hw/xen/xen_common.h +++ b/include/hw/xen/xen_common.h @@ -152,6 +152,13 @@ static inline int xendevicemodel_set_mem_type( return xc_hvm_set_mem_type(dmod, domid, mem_type, first_pfn, nr); } +static inline int xendevicemodel_restrict( + xendevicemodel_handle *dmod, domid_t domid) +{ + errno = ENOTTY; + return -1; +} + #else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40900 */ #include @@ -206,6 +213,19 @@ static inline int xen_modified_memory(domid_t domid, uint64_t first_pfn, return xendevicemodel_modified_memory(xen_dmod, domid, first_pfn, nr); } +static inline int xen_restrict(domid_t domid) +{ + int rc = xendevicemodel_restrict(xen_dmod, domid); + + trace_xen_domid_restrict(errno); + + if (errno == ENOTTY) { + return 0; + } + + return rc; +} + /* Xen 4.2 through 4.6 */ #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701 diff --git a/qemu-options.hx b/qemu-options.hx index 99af8ed..d380f7d 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3354,6 +3354,11 @@ DEF("xen-attach", 0, QEMU_OPTION_xen_attach, "-xen-attach attach to existing xen domain\n" " xend will use this when starting QEMU\n", QEMU_ARCH_ALL) +DEF("xen-domid-restrict", 0, QEMU_OPTION_xen_domid_restrict, + "-xen-domid-restrict restrict set of available xen operations\n" + " to specified domain id. (Does not affect\n + " xenpv machine type).\n", + QEMU_ARCH_ALL) STEXI @item -xen-domid @var{id} @findex -xen-domid @@ -3366,6 +3371,8 @@ Warning: should not be used when xend is in use (XEN only). @findex -xen-attach Attach to existing xen domain. xend will use this when starting QEMU (XEN only). +@findex -xen-domid-restrict +Restrict set of available xen operations to specified domain id (XEN only). ETEXI DEF("no-reboot", 0, QEMU_OPTION_no_reboot, \ diff --git a/vl.c b/vl.c index 0b4ed52..f46e070 100644 --- a/vl.c +++ b/vl.c @@ -205,6 +205,7 @@ static NotifierList machine_init_done_notifiers = bool xen_allowed; uint32_t xen_domid; enum xen_mode xen_mode = XEN_EMULATE; +bool xen_domid_restrict; static int has_defaults = 1; static int default_serial = 1; @@ -3933,6 +3934,13 @@ int main(int argc, char **argv, char **envp) } xen_mode = XEN_ATTACH; break; + case QEMU_OPTION_xen_domid_restrict: + if (!(xen_available())) { + error_report("Option not supported for this target"); + exit(1); + } + xen_domid_restrict = true; + break; case QEMU_OPTION_trace: g_free(trace_file); trace_file = trace_opt_parse(optarg); diff --git a/xen-hvm.c b/xen-hvm.c index 4b928cf..335e263 100644 --- a/xen-hvm.c +++ b/xen-hvm.c @@ -1226,6 +1226,14 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory) goto err; } + if (xen_domid_restrict) { + rc = xen_restrict(xen_domid); + if (rc < 0) { + error_report("failed to restrict: error %d", errno); + goto err; + } + } + xen_create_ioreq_server(xen_domid, &state->ioservid); state->exit.notify = xen_exit_notifier;