[Xen-changelog] [xen staging] VT-d: check all of an RMRR for being E820-reserved

[patchbot@xxxxxxx]

commit d6573bc6e6b7d95bb9de8471a6bfd7048ebc50f3
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Feb 18 16:21:19 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 18 16:21:19 2020 +0100

    VT-d: check all of an RMRR for being E820-reserved
    
    Checking just the first and last page is not sufficient (and redundant
    for single-page regions). As we don't need to care about IA64 anymore,
    use an x86-specific function to get this done without looping over each
    individual page.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/dmar.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/dmar.c 
b/xen/drivers/passthrough/vtd/dmar.c
index 1784f91b34..caef090b50 100644
--- a/xen/drivers/passthrough/vtd/dmar.c
+++ b/xen/drivers/passthrough/vtd/dmar.c
@@ -29,6 +29,7 @@
 #include <xen/pci.h>
 #include <xen/pci_regs.h>
 #include <asm/atomic.h>
+#include <asm/e820.h>
 #include <asm/string.h>
 #include "dmar.h"
 #include "iommu.h"
@@ -632,14 +633,11 @@ acpi_parse_one_rmrr(struct acpi_dmar_header *header)
      * not properly represented in the system memory map and
      * inform the user
      */
-    if ( (!page_is_ram_type(paddr_to_pfn(base_addr), RAM_TYPE_RESERVED)) ||
-         (!page_is_ram_type(paddr_to_pfn(end_addr), RAM_TYPE_RESERVED)) )
-    {
+    if ( !e820_all_mapped(base_addr, end_addr + 1, RAM_TYPE_RESERVED) )
         printk(XENLOG_WARNING VTDPREFIX
                "  RMRR address range %"PRIx64"..%"PRIx64" not in reserved 
memory;"
                " need \"iommu_inclusive_mapping=1\"?\n",
                 base_addr, end_addr);
-    }
 
     rmrru = xzalloc(struct acpi_rmrr_unit);
     if ( !rmrru )
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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