[Xen-devel] [PATCH v7 04/10] x86/hypervisor: provide hypervisor_fixup_e820

[Wei Liu <wl@xen.org>]

And implement the hook for Xen guest.

Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
v7:
1. Drop bogus ASSERT_UNREACHABLE from stub
2. Add Jan's Rb, considering #1 doesn't change the meat of the patch
---
 xen/arch/x86/e820.c                    | 4 ++--
 xen/arch/x86/guest/hypervisor.c        | 6 ++++++
 xen/arch/x86/guest/xen/xen.c           | 7 +++++++
 xen/include/asm-x86/guest/hypervisor.h | 6 ++++++
 4 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/e820.c b/xen/arch/x86/e820.c
index b9f589cac3..160f029edd 100644
--- a/xen/arch/x86/e820.c
+++ b/xen/arch/x86/e820.c
@@ -691,8 +691,8 @@ unsigned long __init init_e820(const char *str, struct e820map *raw)
 
     machine_specific_memory_setup(raw);
 
-    if ( pv_shim )
-        pv_shim_fixup_e820(&e820);
+    if ( cpu_has_hypervisor )
+        hypervisor_e820_fixup(&e820);
 
     printk("%s RAM map:\n", str);
     print_e820_memory_map(e820.map, e820.nr_map);
diff --git a/xen/arch/x86/guest/hypervisor.c b/xen/arch/x86/guest/hypervisor.c
index e72c92ffdf..5fd433c8d4 100644
--- a/xen/arch/x86/guest/hypervisor.c
+++ b/xen/arch/x86/guest/hypervisor.c
@@ -66,6 +66,12 @@ void hypervisor_resume(void)
         ops->resume();
 }
 
+void __init hypervisor_e820_fixup(struct e820map *e820)
+{
+    if ( ops && ops->e820_fixup )
+        ops->e820_fixup(e820);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/guest/xen/xen.c b/xen/arch/x86/guest/xen/xen.c
index 1cf09886da..5a7f3cce42 100644
--- a/xen/arch/x86/guest/xen/xen.c
+++ b/xen/arch/x86/guest/xen/xen.c
@@ -322,11 +322,18 @@ static void resume(void)
         pv_console_init();
 }
 
+static void __init e820_fixup(struct e820map *e820)
+{
+    if ( pv_shim )
+        pv_shim_fixup_e820(e820);
+}
+
 static const struct hypervisor_ops ops = {
     .name = "Xen",
     .setup = setup,
     .ap_setup = ap_setup,
     .resume = resume,
+    .e820_fixup = e820_fixup,
 };
 
 const struct hypervisor_ops *__init xg_probe(void)
diff --git a/xen/include/asm-x86/guest/hypervisor.h b/xen/include/asm-x86/guest/hypervisor.h
index 64383f0c3d..ade10e74ea 100644
--- a/xen/include/asm-x86/guest/hypervisor.h
+++ b/xen/include/asm-x86/guest/hypervisor.h
@@ -19,6 +19,8 @@
 #ifndef __X86_HYPERVISOR_H__
 #define __X86_HYPERVISOR_H__
 
+#include <asm/e820.h>
+
 struct hypervisor_ops {
     /* Name of the hypervisor */
     const char *name;
@@ -28,6 +30,8 @@ struct hypervisor_ops {
     int (*ap_setup)(void);
     /* Resume from suspension */
     void (*resume)(void);
+    /* Fix up e820 map */
+    void (*e820_fixup)(struct e820map *e820);
 };
 
 #ifdef CONFIG_GUEST
@@ -36,6 +40,7 @@ const char *hypervisor_probe(void);
 void hypervisor_setup(void);
 int hypervisor_ap_setup(void);
 void hypervisor_resume(void);
+void hypervisor_e820_fixup(struct e820map *e820);
 
 #else
 
@@ -46,6 +51,7 @@ static inline const char *hypervisor_probe(void) { return NULL; }
 static inline void hypervisor_setup(void) { ASSERT_UNREACHABLE(); }
 static inline int hypervisor_ap_setup(void) { return 0; }
 static inline void hypervisor_resume(void) { ASSERT_UNREACHABLE(); }
+static inline void hypervisor_e820_fixup(struct e820map *e820) {}
 
 #endif  /* CONFIG_GUEST */
 
-- 
2.20.1


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