commit 56918a126ae25383cb0c2c74a6f0f784a6d59ac1
author Sean Christopherson <sean.j.christopherson@intel.com> Mon Jul 19 19:21:04 2021 +0800
committer Paolo Bonzini <pbonzini@redhat.com> Thu Sep 30 14:50:19 2021 +0200
tree 2694e522c8582fb67fed63bfcad65fe3649ca3bc
parent ba0fa56bc06e563de68d2a2bf3ddb0cfea1be4f9

memory: Add RAM_PROTECTED flag to skip IOMMU mappings

Add a new RAMBlock flag to denote "protected" memory, i.e. memory that
looks and acts like RAM but is inaccessible via normal mechanisms,
including DMA.  Use the flag to skip protected memory regions when
mapping RAM for DMA in VFIO.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

softmmu/physmem.c

diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index 23e77cb..088660d 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -2055,7 +2055,8 @@
     int64_t file_size, file_align;
 
     /* Just support these ram flags by now. */
-    assert((ram_flags & ~(RAM_SHARED | RAM_PMEM | RAM_NORESERVE)) == 0);
+    assert((ram_flags & ~(RAM_SHARED | RAM_PMEM | RAM_NORESERVE |
+                          RAM_PROTECTED)) == 0);
 
     if (xen_enabled()) {
         error_setg(errp, "-mem-path not supported with Xen");