From 6e833587e11ed0dbf12e647127f2650e2f80b26d Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Tue, 19 Aug 2008 13:16:17 -0700 Subject: [PATCH] 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 Cc: Xen-devel Signed-off-by: Ingo Molnar --- arch/x86/xen/enlighten.c | 9 +++++++-- drivers/block/xen-blkfront.c | 2 +- drivers/char/hvc_xen.c | 6 +++--- drivers/input/xen-kbdfront.c | 4 ++-- drivers/net/xen-netfront.c | 6 +++--- drivers/video/xen-fbfront.c | 4 ++-- drivers/xen/balloon.c | 2 +- drivers/xen/grant-table.c | 2 +- drivers/xen/xenbus/xenbus_probe.c | 8 ++++---- include/asm-x86/xen/hypervisor.h | 14 ++++++++++++-- 10 files changed, 36 insertions(+), 21 deletions(-) diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 53afa14eb314..b106e825d266 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -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); diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 3ca643cafccd..d5e753255153 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -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)) { diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c index 6b70aa66a587..538ceea5e7df 100644 --- a/drivers/char/hvc_xen.c +++ b/drivers/char/hvc_xen.c @@ -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); diff --git a/drivers/input/xen-kbdfront.c b/drivers/input/xen-kbdfront.c index 9ce3b3baf3a2..3ab6362f043c 100644 --- a/drivers/input/xen-kbdfront.c +++ b/drivers/input/xen-kbdfront.c @@ -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); diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index c749bdba214c..3c3dd403f5dd 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -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); diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c index 47ed39b52f9c..a463b3dd837b 100644 --- a/drivers/video/xen-fbfront.c +++ b/drivers/video/xen-fbfront.c @@ -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); diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index fff987b10e0f..a51f3e17a5fd 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -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"); diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index e9e11168616a..06592b9da83c 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -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; diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index 57ceb5346b74..7f24a98a446f 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -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)) { diff --git a/include/asm-x86/xen/hypervisor.h b/include/asm-x86/xen/hypervisor.h index 8e15dd28c91f..d9dd28caa508 100644 --- a/include/asm-x86/xen/hypervisor.h +++ b/include/asm-x86/xen/hypervisor.h @@ -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__ */