linux-kernel - [PATCH 1/3] xen/mcelog: drop __MC_MSR

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Date:   Mon, 11 Nov 2019 15:45:42 +0100
From:   Jan Beulich <jbeulich@...e.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>
Cc:     "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] xen/mcelog: drop __MC_MSR_MCGCAP

It has never been part of Xen's public interface, and there's therefore
no guarantee for MCG_CAP's value to always be present in array entry 0.

Signed-off-by: Jan Beulich <jbeulich@...e.com>

--- a/drivers/xen/mcelog.c
+++ b/drivers/xen/mcelog.c
@@ -222,7 +222,7 @@ static int convert_log(struct mc_info *m
 	struct mcinfo_global *mc_global;
 	struct mcinfo_bank *mc_bank;
 	struct xen_mce m;
-	uint32_t i;
+	unsigned int i, j;
 
 	mic = NULL;
 	x86_mcinfo_lookup(&mic, mi, MC_TYPE_GLOBAL);
@@ -248,7 +248,12 @@ static int convert_log(struct mc_info *m
 	m.socketid = g_physinfo[i].mc_chipid;
 	m.cpu = m.extcpu = g_physinfo[i].mc_cpunr;
 	m.cpuvendor = (__u8)g_physinfo[i].mc_vendor;
-	m.mcgcap = g_physinfo[i].mc_msrvalues[__MC_MSR_MCGCAP].value;
+	for (j = 0; j < g_physinfo[i].mc_nmsrvals; ++j)
+		switch (g_physinfo[i].mc_msrvalues[j].reg) {
+		case MSR_IA32_MCG_CAP:
+			m.mcgcap = g_physinfo[i].mc_msrvalues[j].value;
+			break;
+		}
 
 	mic = NULL;
 	x86_mcinfo_lookup(&mic, mi, MC_TYPE_BANK);
--- a/include/xen/interface/xen-mca.h
+++ b/include/xen/interface/xen-mca.h
@@ -183,7 +183,6 @@ struct mc_info {
 DEFINE_GUEST_HANDLE_STRUCT(mc_info);
 
 #define __MC_MSR_ARRAYSIZE 8
-#define __MC_MSR_MCGCAP 0
 #define __MC_NMSRS 1
 #define MC_NCAPS 7
 struct mcinfo_logical_cpu {