[Xen-changelog] [xen staging] x86: provide Dom0 access to PPIN via XENPF_resource_op

[patchbot@xxxxxxx]

commit 5c13ed79f3cba200f21e7dfd6ed7f3aa08e4dada
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Dec 18 14:49:59 2019 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Dec 18 14:49:59 2019 +0100

    x86: provide Dom0 access to PPIN via XENPF_resource_op
    
    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>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/platform_hypercall.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/arch/x86/platform_hypercall.c 
b/xen/arch/x86/platform_hypercall.c
index b19f6ec4ed..80efb84328 100644
--- 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 resource_access *ra)
         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;
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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