[mini-os master] x86/pv: fix breakage of grub-pv build

[patchbot@xxxxxxx]

commit 2d3b22f842a969574cf967925b435c5913e8a6e0
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Thu Jun 26 14:59:48 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jun 26 14:59:48 2025 +0200

    x86/pv: fix breakage of grub-pv build
    
    grub-pv is relying on start_info being defined, so provide a definition
    which can be used.
    
    Fixes: d669a312b2b2 ("x86/pv: remove global start_info")
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
---
 arch/x86/setup.c     | 1 +
 include/hypervisor.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/setup.c b/arch/x86/setup.c
index b3fc835..ed28d94 100644
--- a/arch/x86/setup.c
+++ b/arch/x86/setup.c
@@ -67,6 +67,7 @@ static inline void sse_init(void) {
  * This pointer holds a reference to the start_info struct.
  */
 start_info_t *start_info_ptr;
+EXPORT_SYMBOL(start_info_ptr);
 
 #define hpc_init()
 
diff --git a/include/hypervisor.h b/include/hypervisor.h
index f40bc8c..d199f03 100644
--- a/include/hypervisor.h
+++ b/include/hypervisor.h
@@ -30,6 +30,8 @@
 #ifdef CONFIG_PARAVIRT
 /* A pointer to the start of day information passed up from the hypervisor. */
 extern start_info_t *start_info_ptr;
+
+#define start_info (*start_info_ptr)
 #else
 int hvm_get_parameter(int idx, uint64_t *value);
 int hvm_set_parameter(int idx, uint64_t value);
--
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