[PATCH 2/2] i386: Fix MCE support for AMD hosts

[John Allen]

For the most part, AMD hosts can use the same MCE injection code as Intel but,
there are instances where the qemu implementation is Intel specific. First, MCE
deliviery works differently on AMD and does not support broadcast. Second,
kvm_mce_inject generates MCEs that include a number of Intel specific status
bits. Modify kvm_mce_inject to properly generate MCEs on AMD platforms.

Reported-by: William Roche <william.ro...@oracle.com>
Signed-off-by: John Allen <john.al...@amd.com>
---
 target/i386/helper.c  |  4 ++++
 target/i386/kvm/kvm.c | 17 +++++++++++------
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/target/i386/helper.c b/target/i386/helper.c
index 533b29cb91..a6523858e0 100644
--- a/target/i386/helper.c
+++ b/target/i386/helper.c
@@ -76,6 +76,10 @@ int cpu_x86_support_mca_broadcast(CPUX86State *env)
     int family = 0;
     int model = 0;
 
+    if (IS_AMD_CPU(env)) {
+        return 0;
+    }
+
     cpu_x86_version(env, &family, &model);
     if ((family == 6 && model >= 14) || family > 6) {
         return 1;
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index f25837f63f..63bd7a7d3a 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -530,16 +530,21 @@ static void kvm_mce_inject(X86CPU *cpu, hwaddr paddr, int 
code)
     CPUState *cs = CPU(cpu);
     CPUX86State *env = &cpu->env;
     uint64_t status = MCI_STATUS_VAL | MCI_STATUS_UC | MCI_STATUS_EN |
-                      MCI_STATUS_MISCV | MCI_STATUS_ADDRV | MCI_STATUS_S;
+                      MCI_STATUS_MISCV | MCI_STATUS_ADDRV;
     uint64_t mcg_status = MCG_STATUS_MCIP;
     int flags = 0;
 
-    if (code == BUS_MCEERR_AR) {
-        status |= MCI_STATUS_AR | 0x134;
-        mcg_status |= MCG_STATUS_EIPV;
+    if (!IS_AMD_CPU(env)) {
+        status |= MCI_STATUS_S;
+        if (code == BUS_MCEERR_AR) {
+            status |= MCI_STATUS_AR | 0x134;
+            mcg_status |= MCG_STATUS_EIPV;
+        } else {
+            status |= 0xc0;
+            mcg_status |= MCG_STATUS_RIPV;
+        }
     } else {
-        status |= 0xc0;
-        mcg_status |= MCG_STATUS_RIPV;
+        mcg_status |= MCG_STATUS_EIPV | MCG_STATUS_RIPV;
     }
 
     flags = cpu_x86_support_mca_broadcast(env) ? MCE_INJECT_BROADCAST : 0;
-- 
2.39.3