[PATCH 2/2] tpm_crb: mark memory as protected

[Laurent Vivier]

This memory is not correctly aligned and cannot be registered
by vDPA and VFIO.

An error is reported for vhost-vdpa case:
qemu-kvm: vhost_vdpa_listener_region_add received unaligned region

To make it ignored by VFIO and vDPA devices, mark it as RAM_PROTECTED.

The RAM_PROTECTED flag has been introduced to skip memory
region that looks like RAM but is not accessible via normal
mechanims, including DMA.

See 56918a126a ("memory: Add RAM_PROTECTED flag to skip IOMMU mappings")

Bug: https://bugzilla.redhat.com/show_bug.cgi?id=2141965

cc: peter.maydell@linaro.org
cc: marcandre.lureau@redhat.com
cc: eric.auger@redhat.com
cc: mst@redhat.com
cc: jasowang@redhat.com
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
 hw/tpm/tpm_crb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c
index ea930da545af..0a93c488f2fa 100644
--- a/hw/tpm/tpm_crb.c
+++ b/hw/tpm/tpm_crb.c
@@ -296,7 +296,7 @@ static void tpm_crb_realize(DeviceState *dev, Error **errp)
 
     memory_region_init_io(&s->mmio, OBJECT(s), &tpm_crb_memory_ops, s,
         "tpm-crb-mmio", sizeof(s->regs));
-    memory_region_init_ram(&s->cmdmem, OBJECT(s),
+    memory_region_init_ram_protected(&s->cmdmem, OBJECT(s),
         "tpm-crb-cmd", CRB_CTRL_CMD_SIZE, errp);
 
     memory_region_add_subregion(get_system_memory(),
-- 
2.41.0