From patchwork Fri Mar 17 13:30:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 740323 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3vl5np4HJ3z9ryZ for ; Sat, 18 Mar 2017 00:30:54 +1100 (AEDT) Received: from localhost ([::1]:49041 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cory0-00061S-7G for incoming@patchwork.ozlabs.org; Fri, 17 Mar 2017 09:30:52 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57313) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1corxe-00061J-EO for qemu-devel@nongnu.org; Fri, 17 Mar 2017 09:30:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1corxa-0006aY-6Q for qemu-devel@nongnu.org; Fri, 17 Mar 2017 09:30:30 -0400 Received: from smtp.citrix.com ([66.165.176.89]:38084) by eggs.gnu.org with esmtps (TLS1.0:RSA_ARCFOUR_SHA1:16) (Exim 4.71) (envelope-from ) id 1corxZ-0006aB-Vv for qemu-devel@nongnu.org; Fri, 17 Mar 2017 09:30:26 -0400 X-IronPort-AV: E=Sophos;i="5.36,176,1486425600"; d="scan'208";a="414385267" From: Paul Durrant To: , Date: Fri, 17 Mar 2017 13:30:19 +0000 Message-ID: <1489757419-8179-1-git-send-email-paul.durrant@citrix.com> X-Mailer: git-send-email 2.1.4 MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 66.165.176.89 Subject: [Qemu-devel] [PATCH] xen: use libxendevice model to restrict operations 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: Anthony Perard , Paolo Bonzini , Paul Durrant , Stefano Stabellini Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch adds a command-line option (-xen-domid-restrict) which will use the new libxendevicemodel API to restrict devicemodel operations to the specified domid. This patch also adds a tracepoint to allow successful enabling of the restriction to be monitored. 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. --- hw/xen/trace-events | 1 + include/hw/xen/xen.h | 1 + include/hw/xen/xen_common.h | 23 +++++++++++++++++++++++ qemu-options.hx | 6 ++++++ vl.c | 8 ++++++++ xen-hvm.c | 8 ++++++++ 6 files changed, 47 insertions(+) diff --git a/hw/xen/trace-events b/hw/xen/trace-events index c4fb6f1..a5b5e8b 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(void) "" 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..5962bc4 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 +213,22 @@ 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); + + if (rc == 0) { + trace_xen_domid_restrict(); + return 0; + } + + 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..4aab077 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3354,6 +3354,10 @@ 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\n", + QEMU_ARCH_ALL) STEXI @item -xen-domid @var{id} @findex -xen-domid @@ -3366,6 +3370,8 @@ 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;