[xen staging-4.20] libacpi: Remove CPU hotplug and GPE handling from PVH DSDTs

[patchbot@xxxxxxx]

commit a5aa6b397f83e4a2a40f2e43e07b2d872273dee5
Author:     Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
AuthorDate: Tue Oct 21 15:19:21 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 21 15:19:21 2025 +0200

    libacpi: Remove CPU hotplug and GPE handling from PVH DSDTs
    
    PVH guests have no DM, so this causes the guest to fetch the online CPU
    bitmap from an unbacked 0xaf00 PIO port when executing the GPE handler.
    
    Seeing how ACPI CPU hotplug is the only event delivered via GPE, remove
    the GPE handler in addition to anything ACPI CPU hotplug related.
    
    This shrinks PVH's DSDT substantially and prevents spuriously executing
    a large amount of AML with no purpose at all.
    
    Fixes: 062975dc9441("acpi: PVH guests need _E02 method")
    Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: b59e564aa0830f60214b9b5afb4f8543dd1bf2b0
    master date: 2025-09-25 09:18:55 +0200
---
 tools/libacpi/mk_dsdt.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/libacpi/mk_dsdt.c b/tools/libacpi/mk_dsdt.c
index 34f6753f61..0b1818d4e8 100644
--- a/tools/libacpi/mk_dsdt.c
+++ b/tools/libacpi/mk_dsdt.c
@@ -237,6 +237,11 @@ int main(int argc, char **argv)
     pop_block();
     /**** Processor end ****/
 #else
+    if (dm_version == QEMU_NONE) {
+        pop_block();
+        pop_block();
+        return 0;
+    }
 
     /* Operation Region 'PRST': bitmask of online CPUs. */
     stmt("OperationRegion", "PRST, SystemIO, %#x, %d",
@@ -285,10 +290,6 @@ int main(int argc, char **argv)
     pop_block();
     pop_block();
 
-    if (dm_version == QEMU_NONE) {
-        pop_block();
-        return 0;
-    }
     /**** Processor end ****/
 
 
--
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