[xen staging] x86/PVH: correct PVH Dom0 E820 region merge

[patchbot@xxxxxxx]

commit 5dbe9edbbffc18575b3b657cce8bc5dade582995
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Oct 6 08:15:15 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 6 08:15:15 2026 +0200

    x86/PVH: correct PVH Dom0 E820 region merge
    
    Folding with an immediately successive region can't be done by merely
    lowering the start of the region. The size of the region needs increasing
    as well.
    
    Fixes: 5427134eae81 ("x86: populate PVHv2 Dom0 physical memory map")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
    Reviewed-by: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/dom0_build.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c
index 881e8e21b0..f536f5dcc4 100644
--- a/xen/arch/x86/hvm/dom0_build.c
+++ b/xen/arch/x86/hvm/dom0_build.c
@@ -229,6 +229,7 @@ static int __init pvh_add_mem_range(struct domain *d, 
uint64_t s, uint64_t e,
         if ( rs == e && d->arch.e820[i].type == type )
         {
             d->arch.e820[i].addr = s;
+            d->arch.e820[i].size += e - s;
             return 0;
         }
 
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