[Xen-devel] [PATCH v2 3/3] x86: provide Dom0 access to PPIN via XENPF_resource_op

[Jan Beulich <jbeulich@xxxxxxxx>]

It was requested that we provide a way independent of the MCE reporting
interface that Dom0 software could use to get hold of the values for
particular CPUs.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: New.

TBD: I couldn't identify any suitable utility under tools/misc/ that I
     would have felt like making the frontend of this extension.

--- a/xen/arch/x86/platform_hypercall.c
+++ b/xen/arch/x86/platform_hypercall.c
@@ -30,6 +30,7 @@
 #include <asm/mtrr.h>
 #include <asm/io_apic.h>
 #include <asm/setup.h>
+#include "cpu/mcheck/mce.h"
 #include "cpu/mtrr/mtrr.h"
 #include <xsm/xsm.h>
 
@@ -94,6 +95,9 @@ void check_resource_access(struct resour
         switch ( entry->u.cmd )
         {
         case XEN_RESOURCE_OP_MSR_READ:
+            if ( ppin_msr && entry->idx == ppin_msr )
+                break;
+            /* fall through */
         case XEN_RESOURCE_OP_MSR_WRITE:
             if ( entry->idx >> 32 )
                 ret = -EINVAL;


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