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xen: clean up domain mode predicates 

There are four operating modes Xen code may find itself running in:
 - native
 - hvm domain
 - pv dom0
 - pv domU

Clean up predicates for testing for these states to make them more consistent.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Xen-devel <xen-devel@lists.xensource.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-08-19 13:16:17 -07:00 committed by Ingo Molnar
parent 170465ee7f
commit 6e833587e1
10 changed files with 36 additions and 21 deletions
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9
arch/x86/xen/enlighten.c
View File

@ -56,6 +56,9 @@ EXPORT_SYMBOL_GPL(hypercall_page);
DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
enum xen_domain_type xen_domain_type = XEN_NATIVE;
EXPORT_SYMBOL_GPL(xen_domain_type);
/*
* Identity map, in addition to plain kernel map. This needs to be
* large enough to allocate page table pages to allocate the rest.
@ -1613,6 +1616,8 @@ asmlinkage void __init xen_start_kernel(void)
if (!xen_start_info)
return;
xen_domain_type = XEN_PV_DOMAIN;
BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0);
xen_setup_features();
@ -1650,7 +1655,7 @@ asmlinkage void __init xen_start_kernel(void)
/* Prevent unwanted bits from being set in PTEs. */
__supported_pte_mask &= ~_PAGE_GLOBAL;
if (!is_initial_xendomain())
if (!xen_initial_domain())
__supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
/* Don't do the full vcpu_info placement stuff until we have a
@ -1685,7 +1690,7 @@ asmlinkage void __init xen_start_kernel(void)
boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
if (!is_initial_xendomain()) {
if (!xen_initial_domain()) {
add_preferred_console("xenboot", 0, NULL);
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);

2
drivers/block/xen-blkfront.c
View File

@ -1032,7 +1032,7 @@ static struct xenbus_driver blkfront = {
static int __init xlblk_init(void)
{
if (!is_running_on_xen())
if (!xen_domain())
return -ENODEV;
if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {

6
drivers/char/hvc_xen.c
View File

@ -108,8 +108,8 @@ static int __init xen_init(void)
{
struct hvc_struct *hp;
if (!is_running_on_xen() ||
is_initial_xendomain() ||
if (!xen_pv_domain() ||
xen_initial_domain() ||
!xen_start_info->console.domU.evtchn)
return -ENODEV;
@ -142,7 +142,7 @@ static void __exit xen_fini(void)
static int xen_cons_init(void)
{
if (!is_running_on_xen())
if (!xen_pv_domain())
return 0;
hvc_instantiate(HVC_COOKIE, 0, &hvc_ops);

4
drivers/input/xen-kbdfront.c
View File

@ -335,11 +335,11 @@ static struct xenbus_driver xenkbd = {
static int __init xenkbd_init(void)
{
if (!is_running_on_xen())
if (!xen_domain())
return -ENODEV;
/* Nothing to do if running in dom0. */
if (is_initial_xendomain())
if (xen_initial_domain())
return -ENODEV;
return xenbus_register_frontend(&xenkbd);

6
drivers/net/xen-netfront.c
View File

@ -1794,10 +1794,10 @@ static struct xenbus_driver netfront = {
static int __init netif_init(void)
{
if (!is_running_on_xen())
if (!xen_domain())
return -ENODEV;
if (is_initial_xendomain())
if (xen_initial_domain())
return 0;
printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n");
@ -1809,7 +1809,7 @@ module_init(netif_init);
static void __exit netif_exit(void)
{
if (is_initial_xendomain())
if (xen_initial_domain())
return;
xenbus_unregister_driver(&netfront);

4
drivers/video/xen-fbfront.c
View File

@ -680,11 +680,11 @@ static struct xenbus_driver xenfb = {
static int __init xenfb_init(void)
{
if (!is_running_on_xen())
if (!xen_domain())
return -ENODEV;
/* Nothing to do if running in dom0. */
if (is_initial_xendomain())
if (xen_initial_domain())
return -ENODEV;
return xenbus_register_frontend(&xenfb);

2
drivers/xen/balloon.c
View File

@ -419,7 +419,7 @@ static int __init balloon_init(void)
unsigned long pfn;
struct page *page;
if (!is_running_on_xen())
if (!xen_pv_domain())
return -ENODEV;
pr_info("xen_balloon: Initialising balloon driver.\n");

2
drivers/xen/grant-table.c
View File

@ -508,7 +508,7 @@ static int __devinit gnttab_init(void)
unsigned int max_nr_glist_frames, nr_glist_frames;
unsigned int nr_init_grefs;
if (!is_running_on_xen())
if (!xen_domain())
return -ENODEV;
nr_grant_frames = 1;

8
drivers/xen/xenbus/xenbus_probe.c
View File

@ -814,7 +814,7 @@ static int __init xenbus_probe_init(void)
DPRINTK("");
err = -ENODEV;
if (!is_running_on_xen())
if (!xen_domain())
goto out_error;
/* Register ourselves with the kernel bus subsystem */
@ -829,7 +829,7 @@ static int __init xenbus_probe_init(void)
/*
* Domain0 doesn't have a store_evtchn or store_mfn yet.
*/
if (is_initial_xendomain()) {
if (xen_initial_domain()) {
/* dom0 not yet supported */
} else {
xenstored_ready = 1;
@ -846,7 +846,7 @@ static int __init xenbus_probe_init(void)
goto out_unreg_back;
}
if (!is_initial_xendomain())
if (!xen_initial_domain())
xenbus_probe(NULL);
return 0;
@ -937,7 +937,7 @@ static void wait_for_devices(struct xenbus_driver *xendrv)
unsigned long timeout = jiffies + 10*HZ;
struct device_driver *drv = xendrv ? &xendrv->driver : NULL;
if (!ready_to_wait_for_devices || !is_running_on_xen())
if (!ready_to_wait_for_devices || !xen_domain())
return;
while (exists_disconnected_device(drv)) {

14
include/asm-x86/xen/hypervisor.h
View File

@ -55,7 +55,6 @@
/* arch/i386/kernel/setup.c */
extern struct shared_info *HYPERVISOR_shared_info;
extern struct start_info *xen_start_info;
#define is_initial_xendomain() (xen_start_info->flags & SIF_INITDOMAIN)
/* arch/i386/mach-xen/evtchn.c */
/* Force a proper event-channel callback from Xen. */
@ -68,6 +67,17 @@ u64 jiffies_to_st(unsigned long jiffies);
#define MULTI_UVMFLAGS_INDEX 3
#define MULTI_UVMDOMID_INDEX 4
#define is_running_on_xen() (xen_start_info ? 1 : 0)
enum xen_domain_type {
XEN_NATIVE,
XEN_PV_DOMAIN,
XEN_HVM_DOMAIN,
};
extern enum xen_domain_type xen_domain_type;
#define xen_domain() (xen_domain_type != XEN_NATIVE)
#define xen_pv_domain() (xen_domain_type == XEN_PV_DOMAIN)
#define xen_initial_domain() (xen_pv_domain() && xen_start_info->flags & SIF_INITDOMAIN)
#define xen_hvm_domain() (xen_domain_type == XEN_HVM_DOMAIN)
#endif /* __HYPERVISOR_H__ */