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authorPer Bilse <per.bilse@citrix.com>2023-01-03 13:02:13 +0000
committerJuergen Gross <jgross@suse.com>2023-02-13 06:53:19 +0100
commit415dab3c179632d098aadc756b39cebceb977978 (patch)
tree46521e2cc2c75e7d3a9692dbe8c3a61746a703f6 /drivers/xen
parentceaa837f96adb69c0df0397937cd74991d5d821a (diff)
drivers/xen/hypervisor: Expose Xen SIF flags to userspace
/proc/xen is a legacy pseudo filesystem which predates Xen support getting merged into Linux. It has largely been replaced with more normal locations for data (/sys/hypervisor/ for info, /dev/xen/ for user devices). We want to compile xenfs support out of the dom0 kernel. There is one item which only exists in /proc/xen, namely /proc/xen/capabilities with "control_d" being the signal of "you're in the control domain". This ultimately comes from the SIF flags provided at VM start. This patch exposes all SIF flags in /sys/hypervisor/start_flags/ as boolean files, one for each bit, returning '1' if set, '0' otherwise. Two known flags, 'privileged' and 'initdomain', are explicitly named, and all remaining flags can be accessed via generically named files, as suggested by Andrew Cooper. Signed-off-by: Per Bilse <per.bilse@citrix.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20230103130213.2129753-1-per.bilse@citrix.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/sys-hypervisor.c69
1 files changed, 65 insertions, 4 deletions
diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
index fcb0792f090e..ca092db8f498 100644
--- a/drivers/xen/sys-hypervisor.c
+++ b/drivers/xen/sys-hypervisor.c
@@ -31,7 +31,10 @@ struct hyp_sysfs_attr {
struct attribute attr;
ssize_t (*show)(struct hyp_sysfs_attr *, char *);
ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
- void *hyp_attr_data;
+ union {
+ void *hyp_attr_data;
+ unsigned long hyp_attr_value;
+ };
};
static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
@@ -399,6 +402,60 @@ static int __init xen_sysfs_properties_init(void)
return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
}
+#define FLAG_UNAME "unknown"
+#define FLAG_UNAME_FMT FLAG_UNAME "%02u"
+#define FLAG_UNAME_MAX sizeof(FLAG_UNAME "XX")
+#define FLAG_COUNT (sizeof(xen_start_flags) * BITS_PER_BYTE)
+static_assert(sizeof(xen_start_flags) <=
+ sizeof_field(struct hyp_sysfs_attr, hyp_attr_value));
+
+static ssize_t flag_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ char *p = buffer;
+
+ *p++ = '0' + ((xen_start_flags & attr->hyp_attr_value) != 0);
+ *p++ = '\n';
+ return p - buffer;
+}
+
+#define FLAG_NODE(flag, node) \
+ [ilog2(flag)] = { \
+ .attr = { .name = #node, .mode = 0444 },\
+ .show = flag_show, \
+ .hyp_attr_value = flag \
+ }
+
+/*
+ * Add new, known flags here. No other changes are required, but
+ * note that each known flag wastes one entry in flag_unames[].
+ * The code/complexity machinations to avoid this isn't worth it
+ * for a few entries, but keep it in mind.
+ */
+static struct hyp_sysfs_attr flag_attrs[FLAG_COUNT] = {
+ FLAG_NODE(SIF_PRIVILEGED, privileged),
+ FLAG_NODE(SIF_INITDOMAIN, initdomain)
+};
+static struct attribute_group xen_flags_group = {
+ .name = "start_flags",
+ .attrs = (struct attribute *[FLAG_COUNT + 1]){}
+};
+static char flag_unames[FLAG_COUNT][FLAG_UNAME_MAX];
+
+static int __init xen_sysfs_flags_init(void)
+{
+ for (unsigned fnum = 0; fnum != FLAG_COUNT; fnum++) {
+ if (likely(flag_attrs[fnum].attr.name == NULL)) {
+ sprintf(flag_unames[fnum], FLAG_UNAME_FMT, fnum);
+ flag_attrs[fnum].attr.name = flag_unames[fnum];
+ flag_attrs[fnum].attr.mode = 0444;
+ flag_attrs[fnum].show = flag_show;
+ flag_attrs[fnum].hyp_attr_value = 1 << fnum;
+ }
+ xen_flags_group.attrs[fnum] = &flag_attrs[fnum].attr;
+ }
+ return sysfs_create_group(hypervisor_kobj, &xen_flags_group);
+}
+
#ifdef CONFIG_XEN_HAVE_VPMU
struct pmu_mode {
const char *name;
@@ -539,18 +596,22 @@ static int __init hyper_sysfs_init(void)
ret = xen_sysfs_properties_init();
if (ret)
goto prop_out;
+ ret = xen_sysfs_flags_init();
+ if (ret)
+ goto flags_out;
#ifdef CONFIG_XEN_HAVE_VPMU
if (xen_initial_domain()) {
ret = xen_sysfs_pmu_init();
if (ret) {
- sysfs_remove_group(hypervisor_kobj,
- &xen_properties_group);
- goto prop_out;
+ sysfs_remove_group(hypervisor_kobj, &xen_flags_group);
+ goto flags_out;
}
}
#endif
goto out;
+flags_out:
+ sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
prop_out:
sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
uuid_out: