From 831b0db8abda1d837a299893c4e3027942c8ac49 Mon Sep 17 00:00:00 2001 From: Paul Durrant Date: Tue, 24 Jan 2023 09:34:06 +0000 Subject: [PATCH] hw/xen: Create initial XenStore nodes Signed-off-by: Paul Durrant Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- hw/i386/kvm/xen_xenstore.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/hw/i386/kvm/xen_xenstore.c b/hw/i386/kvm/xen_xenstore.c index 520422b147..fb3648a058 100644 --- a/hw/i386/kvm/xen_xenstore.c +++ b/hw/i386/kvm/xen_xenstore.c @@ -76,9 +76,39 @@ struct XenXenstoreState *xen_xenstore_singleton; static void xen_xenstore_event(void *opaque); static void fire_watch_cb(void *opaque, const char *path, const char *token); +static void G_GNUC_PRINTF (4, 5) relpath_printf(XenXenstoreState *s, + GList *perms, + const char *relpath, + const char *fmt, ...) +{ + gchar *abspath; + gchar *value; + va_list args; + GByteArray *data; + int err; + + abspath = g_strdup_printf("/local/domain/%u/%s", xen_domid, relpath); + va_start(args, fmt); + value = g_strdup_vprintf(fmt, args); + va_end(args); + + data = g_byte_array_new_take((void *)value, strlen(value)); + + err = xs_impl_write(s->impl, DOMID_QEMU, XBT_NULL, abspath, data); + assert(!err); + + g_byte_array_unref(data); + + err = xs_impl_set_perms(s->impl, DOMID_QEMU, XBT_NULL, abspath, perms); + assert(!err); + + g_free(abspath); +} + static void xen_xenstore_realize(DeviceState *dev, Error **errp) { XenXenstoreState *s = XEN_XENSTORE(dev); + GList *perms; if (xen_mode != XEN_EMULATE) { error_setg(errp, "Xen xenstore support is for Xen emulation"); @@ -102,6 +132,46 @@ static void xen_xenstore_realize(DeviceState *dev, Error **errp) xen_xenstore_event, NULL, NULL, NULL, s); s->impl = xs_impl_create(xen_domid); + + /* Populate the default nodes */ + + /* Nodes owned by 'dom0' but readable by the guest */ + perms = g_list_append(NULL, xs_perm_as_string(XS_PERM_NONE, DOMID_QEMU)); + perms = g_list_append(perms, xs_perm_as_string(XS_PERM_READ, xen_domid)); + + relpath_printf(s, perms, "", "%s", ""); + + relpath_printf(s, perms, "domid", "%u", xen_domid); + + relpath_printf(s, perms, "control/platform-feature-xs_reset_watches", "%u", 1); + relpath_printf(s, perms, "control/platform-feature-multiprocessor-suspend", "%u", 1); + + relpath_printf(s, perms, "platform/acpi", "%u", 1); + relpath_printf(s, perms, "platform/acpi_s3", "%u", 1); + relpath_printf(s, perms, "platform/acpi_s4", "%u", 1); + relpath_printf(s, perms, "platform/acpi_laptop_slate", "%u", 0); + + g_list_free_full(perms, g_free); + + /* Nodes owned by the guest */ + perms = g_list_append(NULL, xs_perm_as_string(XS_PERM_NONE, xen_domid)); + + relpath_printf(s, perms, "attr", "%s", ""); + + relpath_printf(s, perms, "control/shutdown", "%s", ""); + relpath_printf(s, perms, "control/feature-poweroff", "%u", 1); + relpath_printf(s, perms, "control/feature-reboot", "%u", 1); + relpath_printf(s, perms, "control/feature-suspend", "%u", 1); + relpath_printf(s, perms, "control/feature-s3", "%u", 1); + relpath_printf(s, perms, "control/feature-s4", "%u", 1); + + relpath_printf(s, perms, "data", "%s", ""); + relpath_printf(s, perms, "device", "%s", ""); + relpath_printf(s, perms, "drivers", "%s", ""); + relpath_printf(s, perms, "error", "%s", ""); + relpath_printf(s, perms, "feature", "%s", ""); + + g_list_free_full(perms, g_free); } static bool xen_xenstore_is_needed(void *opaque) -- 2.11.0