[xen staging] x86/setup: remove bootstrap_map_addr() usage of destroy_xen_mappings()

[patchbot@xxxxxxx]

commit 73194b5701725e53d72b98e568484b2fccaf855c
Author:     Roger Pau Monné <roger.pau@xxxxxxxxx>
AuthorDate: Thu Nov 14 16:12:51 2024 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Nov 14 16:12:51 2024 +0100

    x86/setup: remove bootstrap_map_addr() usage of destroy_xen_mappings()
    
    bootstrap_map_addr() needs to be careful to not remove existing page-table
    structures when tearing down mappings, as such pagetable structures might be
    needed to fulfill subsequent mappings requests.  The comment ahead of the
    function already notes that pagetable memory shouldn't be allocated.
    
    Fix this by using map_pages_to_xen(), which does zap the page-table entries,
    but does not free page-table structures even when empty.
    
    Fixes: 4376c05c3113 ('x86-64: use 1GB pages in 1:1 mapping if available')
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/setup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 4feef9f2e0..5da1c6a345 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -462,7 +462,9 @@ static void *__init bootstrap_map_addr(paddr_t start, 
paddr_t end)
 
     if ( !end )
     {
-        destroy_xen_mappings(BOOTSTRAP_MAP_BASE, BOOTSTRAP_MAP_LIMIT);
+        map_pages_to_xen(BOOTSTRAP_MAP_BASE, INVALID_MFN,
+                         PFN_DOWN(map_cur - BOOTSTRAP_MAP_BASE),
+                         _PAGE_NONE);
         map_cur = BOOTSTRAP_MAP_BASE;
         return NULL;
     }
--
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