[PATCH] hw/misc/ivshmem: Use 32-bit addressing for the memory BAR

[Geoffrey McRae]

Since OVMF 202211 the bios maps BAR2 to an upper address which has the
undesirable effect of making it impossible to map the memory under Linux
due to it exceeding the maximum permissible range for hotplug memory
(see `mhp_get_pluggable_range` in `mm/memory_hotplug.c`). This patch
resolves this by configuring the BAR as 32-bit.

Signed-off-by: Geoffrey McRae <ge...@hostfission.com>
---
 hw/misc/ivshmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index d66d912172..2f8f7e2030 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -913,7 +913,7 @@ static void ivshmem_common_realize(PCIDevice *dev, Error 
**errp)
     pci_register_bar(PCI_DEVICE(s), 2,
                      PCI_BASE_ADDRESS_SPACE_MEMORY |
                      PCI_BASE_ADDRESS_MEM_PREFETCH |
-                     PCI_BASE_ADDRESS_MEM_TYPE_64,
+                     PCI_BASE_ADDRESS_MEM_TYPE_32,
                      s->ivshmem_bar2);
 }
 
-- 
2.39.2