[Xen-devel] [PATCH v5 04/11] x86/physdev: enable PHYSDEVOP_pci_mmcfg_reserved for PVH Dom0

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

So that MMCFG regions not present in the MCFG ACPI table can be added
at run time by the hardware domain.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
Changes since v4:
 - Change the hardware_domain check in hvm_physdev_op to a vpci check.
 - Only register the MMCFG area, but don't scan it.

Changes since v3:
 - New in this version.
---
 xen/arch/x86/hvm/hypercall.c | 4 ++++
 xen/arch/x86/hvm/io.c        | 7 +++----
 xen/arch/x86/physdev.c       | 9 +++++++++
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/hvm/hypercall.c b/xen/arch/x86/hvm/hypercall.c
index e7238ce293..369abfd262 100644
--- a/xen/arch/x86/hvm/hypercall.c
+++ b/xen/arch/x86/hvm/hypercall.c
@@ -89,6 +89,10 @@ static long hvm_physdev_op(int cmd, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         if ( !has_pirq(curr->domain) )
             return -ENOSYS;
         break;
+    case PHYSDEVOP_pci_mmcfg_reserved:
+        if ( !has_vpci(curr->domain) )
+            return -ENOSYS;
+        break;
     }
 
     if ( !curr->hcall_compat )
diff --git a/xen/arch/x86/hvm/io.c b/xen/arch/x86/hvm/io.c
index 2845dc5b48..93c3b21a47 100644
--- a/xen/arch/x86/hvm/io.c
+++ b/xen/arch/x86/hvm/io.c
@@ -524,10 +524,9 @@ static const struct hvm_mmio_ops vpci_mmcfg_ops = {
     .write = vpci_mmcfg_write,
 };
 
-int __hwdom_init register_vpci_mmcfg_handler(struct domain *d, paddr_t addr,
-                                             unsigned int start_bus,
-                                             unsigned int end_bus,
-                                             unsigned int seg)
+int register_vpci_mmcfg_handler(struct domain *d, paddr_t addr,
+                                unsigned int start_bus, unsigned int end_bus,
+                                unsigned int seg)
 {
     struct hvm_mmcfg *mmcfg;
 
diff --git a/xen/arch/x86/physdev.c b/xen/arch/x86/physdev.c
index 0eb409758f..10e0a1ad79 100644
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -559,6 +559,15 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) 
arg)
 
         ret = pci_mmcfg_reserved(info.address, info.segment,
                                  info.start_bus, info.end_bus, info.flags);
+        if ( ret || !is_hvm_domain(currd) )
+            break;
+
+        /*
+         * For HVM (PVH) domains try to add the newly found MMCFG to the
+         * domain.
+         */
+        ret = register_vpci_mmcfg_handler(currd, info.address, info.start_bus,
+                                          info.end_bus, info.segment);
         break;
     }
 
-- 
2.11.0 (Apple Git-81)


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