xen/mcelog: add PPIN to record when available

This is to augment commit 3f5a7896a5 ("x86/mce: Include the PPIN in MCE
records when available").

I'm also adding "synd" and "ipid" fields to struct xen_mce, in an
attempt to keep field offsets in sync with struct mce. These two fields
won't get populated for now, though.

Signed-off-by: Jan Beulich <[e-mail]>
Reviewed-by: Boris Ostrovsky <[e-mail]>
Signed-off-by: Juergen Gross <[e-mail]>

arch/x86/include/asm/msr-index.h

···
 #define MSR_AMD_PSTATE_DEF_BASE		0xc0010064
 #define MSR_AMD64_OSVW_ID_LENGTH	0xc0010140
 #define MSR_AMD64_OSVW_STATUS		0xc0010141
+#define MSR_AMD_PPIN_CTL		0xc00102f0
+#define MSR_AMD_PPIN			0xc00102f1
 #define MSR_AMD64_LS_CFG		0xc0011020
 #define MSR_AMD64_DC_CFG		0xc0011022
 #define MSR_AMD64_BU_CFG2		0xc001102a

drivers/xen/mcelog.c

···
 		case MSR_IA32_MCG_CAP:
 			m.mcgcap = g_physinfo[i].mc_msrvalues[j].value;
 			break;
+
+		case MSR_PPIN:
+		case MSR_AMD_PPIN:
+			m.ppin = g_physinfo[i].mc_msrvalues[j].value;
+			break;
 		}
 
 	mic = NULL;

include/xen/interface/xen-mca.h

···
 };
 DEFINE_GUEST_HANDLE_STRUCT(xen_mc);
 
-/* Fields are zero when not available */
+/*
+ * Fields are zero when not available. Also, this struct is shared with
+ * userspace mcelog and thus must keep existing fields at current offsets.
+ * Only add new fields to the end of the structure
+ */
 struct xen_mce {
 	__u64 status;
 	__u64 misc;
···
 	__u32 socketid;	/* CPU socket ID */
 	__u32 apicid;	/* CPU initial apic ID */
 	__u64 mcgcap;	/* MCGCAP MSR: machine check capabilities of CPU */
+	__u64 synd;	/* MCA_SYND MSR: only valid on SMCA systems */
+	__u64 ipid;	/* MCA_IPID MSR: only valid on SMCA systems */
+	__u64 ppin;	/* Protected Processor Inventory Number */
 };
 
 /*