From: Jan Beulich <jbeulich@suse.com>
Date: Wed, 18 Dec 2019 13:49:59 +0000 (+0100)
Subject: x86: provide Dom0 access to PPIN via XENPF_resource_op
X-Git-Tag: archive/raspbian/4.14.0+80-gd101b417b7-1+rpi1^2~63^2~1017
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https://%22%22/%22http:/www.example.com/cgi/%22https:/%22%22?a=commitdiff_plain;h=5c13ed79f3cba200f21e7dfd6ed7f3aa08e4dada;p=xen.git

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@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

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;