[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 2/2] xen: introduce xsrestrict
Introduce a new command line option "xenopts", with one boolean suboption "xsrestrict". When xsrestrict=on is passed, QEMU will restrict the xenstore connection calling xs_restrict. Also it won't initialize the pv backends as they require higher privileges. Change the xenpv machine xenstore path for startup notification to /local/domain/0/device-model/$DOMID/pv/state, so that it doesn't get confused with the device model path. It requires a toolstack change to allow it to read/write to /local/domain/0/device-model/$DOMID, and listen to /local/domain/0/device-model/$DOMID/pv/state for xenpv machines. Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> --- Changes in v2: - change the xenpv machine xenstore path for startup notification to device-model/$DOMID/pv/state. --- hw/xenpv/xen_machine_pv.c | 2 +- include/hw/xen/xen.h | 2 ++ qemu-options.hx | 15 +++++++++++++++ vl.c | 8 ++++++++ xen-common-stub.c | 2 ++ xen-hvm.c | 37 +++++++++++++++++++++++++++++-------- 6 files changed, 57 insertions(+), 9 deletions(-) diff --git a/hw/xenpv/xen_machine_pv.c b/hw/xenpv/xen_machine_pv.c index 68758a0..262a8ae 100644 --- a/hw/xenpv/xen_machine_pv.c +++ b/hw/xenpv/xen_machine_pv.c @@ -48,7 +48,7 @@ static void xen_init_pv(MachineState *machine) { char path[50]; /* record state running */ - snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); + snprintf(path, sizeof (path), "device-model/%u/pv/state", xen_domid); if (!xs_write(xenstore, XBT_NULL, path, "running", strlen("running"))) { fprintf(stderr, "error recording state\n"); exit(1); diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h index b0ed04c..6e864e0 100644 --- a/include/hw/xen/xen.h +++ b/include/hw/xen/xen.h @@ -52,4 +52,6 @@ void xen_register_framebuffer(struct MemoryRegion *mr); # define HVM_MAX_VCPUS 32 #endif +extern QemuOptsList qemu_xen_opts; + #endif /* QEMU_HW_XEN_H */ diff --git a/qemu-options.hx b/qemu-options.hx index 64af16d..104f138 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3057,6 +3057,21 @@ the guest clock runs ahead of the host clock. Typically this happens when the shift value is high (how high depends on the host machine). ETEXI +DEF("xenopts", HAS_ARG, QEMU_OPTION_xenopts, \ + "-xenopts [xsrestrict=on|off]\n" \ + " Xen Specific Options\n", QEMU_ARCH_ALL) +STEXI +@item -xenopts [xsrestrict=on|off] +@findex -xenopts +Options for the Xen hypervisor: + +@option{xsrestrict=on} will cause QEMU to restrict its xenstore +connection to the privilege level of the guest it is serving. This will +cause QEMU not to initialize the Xen PV backends, as they require an higher +privilege level. +ETEXI + + DEF("watchdog", HAS_ARG, QEMU_OPTION_watchdog, \ "-watchdog i6300esb|ib700\n" \ " enable virtual hardware watchdog [default=none]\n", diff --git a/vl.c b/vl.c index 81d80ae..acd4eea 100644 --- a/vl.c +++ b/vl.c @@ -2815,6 +2815,7 @@ int main(int argc, char **argv, char **envp) qemu_add_opts(&qemu_name_opts); qemu_add_opts(&qemu_numa_opts); qemu_add_opts(&qemu_icount_opts); + qemu_add_opts(&qemu_xen_opts); runstate_init(); @@ -3666,6 +3667,13 @@ int main(int argc, char **argv, char **envp) exit(1); } break; + case QEMU_OPTION_xenopts: + opts = qemu_opts_parse(qemu_find_opts("xenopts"), + optarg, 0); + if (!opts) { + exit(1); + } + break; case QEMU_OPTION_incoming: incoming = optarg; runstate_set(RUN_STATE_INMIGRATE); diff --git a/xen-common-stub.c b/xen-common-stub.c index 906f991..6792c2c 100644 --- a/xen-common-stub.c +++ b/xen-common-stub.c @@ -8,6 +8,8 @@ #include "qemu-common.h" #include "hw/xen/xen.h" +QemuOptsList qemu_xen_opts = { }; + void xenstore_store_pv_console_info(int i, CharDriverState *chr) { } diff --git a/xen-hvm.c b/xen-hvm.c index 8079b8e..30fac46 100644 --- a/xen-hvm.c +++ b/xen-hvm.c @@ -36,6 +36,19 @@ do { } while (0) #endif +QemuOptsList qemu_xen_opts = { + .name = "xenopts", + .head = QTAILQ_HEAD_INITIALIZER(qemu_xen_opts.head), + .merge_lists = true, + .desc = { + { + .name = "xsrestrict", + .type = QEMU_OPT_BOOL, + }, + { /* end of list */ } + }, +}; + static MemoryRegion ram_memory, ram_640k, ram_lo, ram_hi; static MemoryRegion *framebuffer; static bool xen_in_migration; @@ -1192,6 +1205,7 @@ int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size, xen_pfn_t bufioreq_pfn; evtchn_port_t bufioreq_evtchn; XenIOState *state; + QemuOpts *opts; state = g_malloc0(sizeof (XenIOState)); @@ -1310,16 +1324,23 @@ int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size, state->device_listener = xen_device_listener; device_listener_register(&state->device_listener); - /* Initialize backend core & drivers */ - if (xen_be_init() != 0) { - fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__); - return -1; - } - xen_be_register("console", &xen_console_ops); - xen_be_register("vkbd", &xen_kbdmouse_ops); - xen_be_register("qdisk", &xen_blkdev_ops); xen_read_physmap(state); + opts = QTAILQ_FIRST(&qemu_xen_opts.head); + if (qemu_opt_get_bool(opts, "xsrestrict", false)) { + xs_restrict(state->xenstore, xen_domid); + } else { + /* Initialize backend core & drivers */ + if (xen_be_init() != 0) { + fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__); + return -1; + } + + xen_be_register("console", &xen_console_ops); + xen_be_register("vkbd", &xen_kbdmouse_ops); + xen_be_register("qdisk", &xen_blkdev_ops); + } + return 0; } -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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