[xen staging-4.22] x86/PVH: correct PVH Dom0 E820 region merge

[patchbot@xxxxxxx]

commit 9f62a1b12a9b01b93ae1428e84372c73f5ff0d23
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Oct 29 13:15:13 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Oct 29 13:15:13 2026 +0100

    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>
    master commit: 5dbe9edbbffc18575b3b657cce8bc5dade582995
    master date: 2026-10-06 08:15:15 +0200
---
 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 aa06cdb2f7..8238353631 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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