[Xen-devel] [PATCH for-next v2 8/9] x86: be more verbose when running on a hypervisor

[Wei Liu]

Signed-off-by: Wei Liu <li...@microsoft.com>
---
 xen/arch/x86/guest/hypervisor.c        | 5 +++++
 xen/arch/x86/setup.c                   | 6 +++++-
 xen/include/asm-x86/guest/hypervisor.h | 2 ++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/guest/hypervisor.c b/xen/arch/x86/guest/hypervisor.c
index 30453b6a7a..8161b26c5a 100644
--- a/xen/arch/x86/guest/hypervisor.c
+++ b/xen/arch/x86/guest/hypervisor.c
@@ -43,6 +43,11 @@ bool hypervisor_probe(void)
     return !!hops;
 }
 
+const char *hypervisor_name(void)
+{
+    return hops->name;
+}
+
 void hypervisor_setup(void)
 {
     if ( hops && hops->setup )
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 0ee11b15a6..cf5a7b8e1e 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -689,6 +689,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
     int i, j, e820_warn = 0, bytes = 0;
     bool acpi_boot_table_init_done = false, relocated = false;
     int ret;
+    bool running_on_hypervisor;
     struct ns16550_defaults ns16550 = {
         .data_bits = 8,
         .parity    = 'n',
@@ -763,7 +764,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
      * allocing any xenheap structures wanted in lower memory. */
     kexec_early_calculations();
 
-    hypervisor_probe();
+    running_on_hypervisor = hypervisor_probe();
 
     parse_video_info();
 
@@ -789,6 +790,9 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
     printk("Xen image load base address: %#lx\n", xen_phys_start);
 
+    if ( running_on_hypervisor )
+        printk("Running on %s\n", hypervisor_name());
+
 #ifdef CONFIG_VIDEO
     printk("Video information:\n");
 
diff --git a/xen/include/asm-x86/guest/hypervisor.h 
b/xen/include/asm-x86/guest/hypervisor.h
index 38344e2e89..a7d75bf9cf 100644
--- a/xen/include/asm-x86/guest/hypervisor.h
+++ b/xen/include/asm-x86/guest/hypervisor.h
@@ -36,6 +36,7 @@ bool hypervisor_probe(void);
 void hypervisor_setup(void);
 void hypervisor_ap_setup(void);
 void hypervisor_resume(void);
+const char *hypervisor_name(void);
 
 #else
 
@@ -45,6 +46,7 @@ static inline bool hypervisor_probe(void) { return false; }
 static inline void hypervisor_setup(void) {}
 static inline void hypervisor_ap_setup(void) {}
 static inline void hypervisor_resume(void) {}
+static inline char *hypervisor_name(void) { return NULL; }
 
 #endif  /* CONFIG_GUEST */
 
-- 
2.20.1


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