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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 11:46:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 11:46:48 -0700
commit752240e74d650faa24425adc523f1308973ea51c (patch)
tree47657b7d468352424f844156883302653252f70e /drivers/xen
parentb8cb642af98216fe6eeca1525345b8a5c9d7c9a4 (diff)
parent626d7508664c4bc8e67f496da4387ecd0c410b8c (diff)
Merge tag 'for-linus-4.3-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from David Vrabel: "Xen features and fixes for 4.3: - Convert xen-blkfront to the multiqueue API - [arm] Support binding event channels to different VCPUs. - [x86] Support > 512 GiB in a PV guests (off by default as such a guest cannot be migrated with the current toolstack). - [x86] PMU support for PV dom0 (limited support for using perf with Xen and other guests)" * tag 'for-linus-4.3-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (33 commits) xen: switch extra memory accounting to use pfns xen: limit memory to architectural maximum xen: avoid another early crash of memory limited dom0 xen: avoid early crash of memory limited dom0 arm/xen: Remove helpers which are PV specific xen/x86: Don't try to set PCE bit in CR4 xen/PMU: PMU emulation code xen/PMU: Intercept PMU-related MSR and APIC accesses xen/PMU: Describe vendor-specific PMU registers xen/PMU: Initialization code for Xen PMU xen/PMU: Sysfs interface for setting Xen PMU mode xen: xensyms support xen: remove no longer needed p2m.h xen: allow more than 512 GB of RAM for 64 bit pv-domains xen: move p2m list if conflicting with e820 map xen: add explicit memblock_reserve() calls for special pages mm: provide early_memremap_ro to establish read-only mapping xen: check for initrd conflicting with e820 map xen: check pre-allocated page tables for conflict with memory map xen: check for kernel memory conflicting with memory layout ...
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/Kconfig11
-rw-r--r--drivers/xen/balloon.c6
-rw-r--r--drivers/xen/events/events_base.c6
-rw-r--r--drivers/xen/sys-hypervisor.c136
-rw-r--r--drivers/xen/xenfs/Makefile1
-rw-r--r--drivers/xen/xenfs/super.c3
-rw-r--r--drivers/xen/xenfs/xenfs.h1
-rw-r--r--drivers/xen/xenfs/xensyms.c152
8 files changed, 307 insertions, 9 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 7cd226da15fe..73708acce3ca 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -280,4 +280,15 @@ config XEN_ACPI
def_bool y
depends on X86 && ACPI
+config XEN_SYMS
+ bool "Xen symbols"
+ depends on X86 && XEN_DOM0 && XENFS
+ default y if KALLSYMS
+ help
+ Exports hypervisor symbols (along with their types and addresses) via
+ /proc/xen/xensyms file, similar to /proc/kallsyms
+
+config XEN_HAVE_VPMU
+ bool
+
endmenu
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index bf4a23c7c591..1fa633b2d556 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -638,9 +638,9 @@ static int __init balloon_init(void)
* regions (see arch/x86/xen/setup.c).
*/
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
- if (xen_extra_mem[i].size)
- balloon_add_region(PFN_UP(xen_extra_mem[i].start),
- PFN_DOWN(xen_extra_mem[i].size));
+ if (xen_extra_mem[i].n_pfns)
+ balloon_add_region(xen_extra_mem[i].start_pfn,
+ xen_extra_mem[i].n_pfns);
return 0;
}
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index ed8bf1067a97..68d129019e8f 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1301,11 +1301,7 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
if (!VALID_EVTCHN(evtchn))
return -1;
- /*
- * Events delivered via platform PCI interrupts are always
- * routed to vcpu 0 and hence cannot be rebound.
- */
- if (xen_hvm_domain() && !xen_have_vector_callback)
+ if (!xen_support_evtchn_rebind())
return -1;
/* Send future instances of this interrupt to other vcpu. */
diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
index 96453f8a85c5..b5a7342e0ba5 100644
--- a/drivers/xen/sys-hypervisor.c
+++ b/drivers/xen/sys-hypervisor.c
@@ -20,6 +20,9 @@
#include <xen/xenbus.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
+#ifdef CONFIG_XEN_HAVE_VPMU
+#include <xen/interface/xenpmu.h>
+#endif
#define HYPERVISOR_ATTR_RO(_name) \
static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
@@ -368,6 +371,126 @@ static void xen_properties_destroy(void)
sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
}
+#ifdef CONFIG_XEN_HAVE_VPMU
+struct pmu_mode {
+ const char *name;
+ uint32_t mode;
+};
+
+static struct pmu_mode pmu_modes[] = {
+ {"off", XENPMU_MODE_OFF},
+ {"self", XENPMU_MODE_SELF},
+ {"hv", XENPMU_MODE_HV},
+ {"all", XENPMU_MODE_ALL}
+};
+
+static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
+ const char *buffer, size_t len)
+{
+ int ret;
+ struct xen_pmu_params xp;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
+ if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
+ xp.val = pmu_modes[i].mode;
+ break;
+ }
+ }
+
+ if (i == ARRAY_SIZE(pmu_modes))
+ return -EINVAL;
+
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ int ret;
+ struct xen_pmu_params xp;
+ int i;
+ uint32_t mode;
+
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
+ if (ret)
+ return ret;
+
+ mode = (uint32_t)xp.val;
+ for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
+ if (mode == pmu_modes[i].mode)
+ return sprintf(buffer, "%s\n", pmu_modes[i].name);
+ }
+
+ return -EINVAL;
+}
+HYPERVISOR_ATTR_RW(pmu_mode);
+
+static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
+ const char *buffer, size_t len)
+{
+ int ret;
+ uint32_t features;
+ struct xen_pmu_params xp;
+
+ ret = kstrtou32(buffer, 0, &features);
+ if (ret)
+ return ret;
+
+ xp.val = features;
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ int ret;
+ struct xen_pmu_params xp;
+
+ xp.version.maj = XENPMU_VER_MAJ;
+ xp.version.min = XENPMU_VER_MIN;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
+ if (ret)
+ return ret;
+
+ return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
+}
+HYPERVISOR_ATTR_RW(pmu_features);
+
+static struct attribute *xen_pmu_attrs[] = {
+ &pmu_mode_attr.attr,
+ &pmu_features_attr.attr,
+ NULL
+};
+
+static const struct attribute_group xen_pmu_group = {
+ .name = "pmu",
+ .attrs = xen_pmu_attrs,
+};
+
+static int __init xen_pmu_init(void)
+{
+ return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
+}
+
+static void xen_pmu_destroy(void)
+{
+ sysfs_remove_group(hypervisor_kobj, &xen_pmu_group);
+}
+#endif
+
static int __init hyper_sysfs_init(void)
{
int ret;
@@ -390,7 +513,15 @@ static int __init hyper_sysfs_init(void)
ret = xen_properties_init();
if (ret)
goto prop_out;
-
+#ifdef CONFIG_XEN_HAVE_VPMU
+ if (xen_initial_domain()) {
+ ret = xen_pmu_init();
+ if (ret) {
+ xen_properties_destroy();
+ goto prop_out;
+ }
+ }
+#endif
goto out;
prop_out:
@@ -407,6 +538,9 @@ out:
static void __exit hyper_sysfs_exit(void)
{
+#ifdef CONFIG_XEN_HAVE_VPMU
+ xen_pmu_destroy();
+#endif
xen_properties_destroy();
xen_compilation_destroy();
xen_sysfs_uuid_destroy();
diff --git a/drivers/xen/xenfs/Makefile b/drivers/xen/xenfs/Makefile
index b019865fcc56..1a83010ddffa 100644
--- a/drivers/xen/xenfs/Makefile
+++ b/drivers/xen/xenfs/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_XENFS) += xenfs.o
xenfs-y = super.o
xenfs-$(CONFIG_XEN_DOM0) += xenstored.o
+xenfs-$(CONFIG_XEN_SYMS) += xensyms.o
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 06092e0fe8ce..8559a71f36b1 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -57,6 +57,9 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
{ "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR},
{ "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR},
+#ifdef CONFIG_XEN_SYMS
+ { "xensyms", &xensyms_ops, S_IRUSR},
+#endif
{""},
};
diff --git a/drivers/xen/xenfs/xenfs.h b/drivers/xen/xenfs/xenfs.h
index 6b80c7779c02..2c5934ea9b1e 100644
--- a/drivers/xen/xenfs/xenfs.h
+++ b/drivers/xen/xenfs/xenfs.h
@@ -3,5 +3,6 @@
extern const struct file_operations xsd_kva_file_ops;
extern const struct file_operations xsd_port_file_ops;
+extern const struct file_operations xensyms_ops;
#endif /* _XENFS_XENBUS_H */
diff --git a/drivers/xen/xenfs/xensyms.c b/drivers/xen/xenfs/xensyms.c
new file mode 100644
index 000000000000..f8b12856753f
--- /dev/null
+++ b/drivers/xen/xenfs/xensyms.c
@@ -0,0 +1,152 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
+#include <xen/xen-ops.h>
+#include "xenfs.h"
+
+
+#define XEN_KSYM_NAME_LEN 127 /* Hypervisor may have different name length */
+
+struct xensyms {
+ struct xen_platform_op op;
+ char *name;
+ uint32_t namelen;
+};
+
+/* Grab next output page from the hypervisor */
+static int xensyms_next_sym(struct xensyms *xs)
+{
+ int ret;
+ struct xenpf_symdata *symdata = &xs->op.u.symdata;
+ uint64_t symnum;
+
+ memset(xs->name, 0, xs->namelen);
+ symdata->namelen = xs->namelen;
+
+ symnum = symdata->symnum;
+
+ ret = HYPERVISOR_dom0_op(&xs->op);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * If hypervisor's symbol didn't fit into the buffer then allocate
+ * a larger buffer and try again.
+ */
+ if (unlikely(symdata->namelen > xs->namelen)) {
+ kfree(xs->name);
+
+ xs->namelen = symdata->namelen;
+ xs->name = kzalloc(xs->namelen, GFP_KERNEL);
+ if (!xs->name)
+ return -ENOMEM;
+
+ set_xen_guest_handle(symdata->name, xs->name);
+ symdata->symnum--; /* Rewind */
+
+ ret = HYPERVISOR_dom0_op(&xs->op);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (symdata->symnum == symnum)
+ /* End of symbols */
+ return 1;
+
+ return 0;
+}
+
+static void *xensyms_start(struct seq_file *m, loff_t *pos)
+{
+ struct xensyms *xs = (struct xensyms *)m->private;
+
+ xs->op.u.symdata.symnum = *pos;
+
+ if (xensyms_next_sym(xs))
+ return NULL;
+
+ return m->private;
+}
+
+static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos)
+{
+ struct xensyms *xs = (struct xensyms *)m->private;
+
+ xs->op.u.symdata.symnum = ++(*pos);
+
+ if (xensyms_next_sym(xs))
+ return NULL;
+
+ return p;
+}
+
+static int xensyms_show(struct seq_file *m, void *p)
+{
+ struct xensyms *xs = (struct xensyms *)m->private;
+ struct xenpf_symdata *symdata = &xs->op.u.symdata;
+
+ seq_printf(m, "%016llx %c %s\n", symdata->address,
+ symdata->type, xs->name);
+
+ return 0;
+}
+
+static void xensyms_stop(struct seq_file *m, void *p)
+{
+}
+
+static const struct seq_operations xensyms_seq_ops = {
+ .start = xensyms_start,
+ .next = xensyms_next,
+ .show = xensyms_show,
+ .stop = xensyms_stop,
+};
+
+static int xensyms_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *m;
+ struct xensyms *xs;
+ int ret;
+
+ ret = seq_open_private(file, &xensyms_seq_ops,
+ sizeof(struct xensyms));
+ if (ret)
+ return ret;
+
+ m = file->private_data;
+ xs = (struct xensyms *)m->private;
+
+ xs->namelen = XEN_KSYM_NAME_LEN + 1;
+ xs->name = kzalloc(xs->namelen, GFP_KERNEL);
+ if (!xs->name) {
+ seq_release_private(inode, file);
+ return -ENOMEM;
+ }
+ set_xen_guest_handle(xs->op.u.symdata.name, xs->name);
+ xs->op.cmd = XENPF_get_symbol;
+ xs->op.u.symdata.namelen = xs->namelen;
+
+ return 0;
+}
+
+static int xensyms_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *m = file->private_data;
+ struct xensyms *xs = (struct xensyms *)m->private;
+
+ kfree(xs->name);
+ return seq_release_private(inode, file);
+}
+
+const struct file_operations xensyms_ops = {
+ .open = xensyms_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = xensyms_release
+};