diff mbox series

[RFC,09/12] IOMMU/AMD: wire common device reserved memory API

Message ID caea51060b225a8ff208962c76deb59cc409ff9f.1654486751.git-series.marmarek@invisiblethingslab.com (mailing list archive)
State Superseded
Headers show
Series Add Xue - console over USB 3 Debug Capability | expand

Commit Message

Marek Marczykowski-Górecki June 6, 2022, 3:40 a.m. UTC 
Register common device reserved memory similar to how ivmd= parameter is
handled.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
 xen/drivers/passthrough/amd/iommu_acpi.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c b/xen/drivers/passthrough/amd/iommu_acpi.c
index ac6835225bae..2a4896c05442 100644
--- a/xen/drivers/passthrough/amd/iommu_acpi.c
+++ b/xen/drivers/passthrough/amd/iommu_acpi.c
@@ -1078,6 +1078,20 @@  static inline bool_t is_ivmd_block(u8 type)
             type == ACPI_IVRS_TYPE_MEMORY_IOMMU);
 }
 
+static int __init cf_check add_one_extra_ivmd(xen_pfn_t start, xen_ulong_t nr, u32 id, void *ctxt)
+{
+    struct acpi_ivrs_memory ivmd;
+
+    ivmd.start_address = start << PAGE_SHIFT;
+    ivmd.memory_length = nr << PAGE_SHIFT;
+    ivmd.header.flags = ACPI_IVMD_UNITY |
+                        ACPI_IVMD_READ | ACPI_IVMD_WRITE;
+    ivmd.header.length = sizeof(ivmd);
+    ivmd.header.device_id = id;
+    ivmd.header.type = ACPI_IVRS_TYPE_MEMORY_ONE;
+    return parse_ivmd_block(&ivmd);
+}
+
 static int __init cf_check parse_ivrs_table(struct acpi_table_header *table)
 {
     const struct acpi_ivrs_header *ivrs_block;
@@ -1121,6 +1135,8 @@  static int __init cf_check parse_ivrs_table(struct acpi_table_header *table)
         AMD_IOMMU_DEBUG("IVMD: %u command line provided entries\n", nr_ivmd);
     for ( i = 0; !error && i < nr_ivmd; ++i )
         error = parse_ivmd_block(user_ivmds + i);
+    if ( !error )
+        error = iommu_get_extra_reserved_device_memory(add_one_extra_ivmd, NULL);
 
     /* Each IO-APIC must have been mentioned in the table. */
     for ( apic = 0; !error && iommu_intremap && apic < nr_ioapics; ++apic )