KVM: s390/sclp: correctly set eca siif bit

Check if siif is available before setting.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c
index 14196ea0fdf3..b57fe0efb422 100644
--- a/drivers/s390/char/sclp_early.c
+++ b/drivers/s390/char/sclp_early.c
@@ -22,7 +22,8 @@ struct read_info_sccb {
         u8      rnsize;                 /* 10 */
         u8      _reserved0[16 - 11];    /* 11-15 */
         u16     ncpurl;                 /* 16-17 */
-        u8      _reserved7[24 - 18];    /* 18-23 */
+        u16     cpuoff;                 /* 18-19 */
+        u8      _reserved7[24 - 20];    /* 20-23 */
         u8      loadparm[8];            /* 24-31 */
         u8      _reserved1[48 - 32];    /* 32-47 */
         u64     facilities;             /* 48-55 */
@@ -45,6 +46,7 @@ static unsigned int sclp_con_has_linemode __initdata;
 static unsigned long sclp_hsa_size;
 static unsigned int sclp_max_cpu;
 static struct sclp_ipl_info sclp_ipl_info;
+static unsigned char sclp_siif;
 
 u64 sclp_facilities;
 u8 sclp_fac84;
@@ -96,6 +98,9 @@ static int __init sclp_read_info_early(struct read_info_sccb *sccb)
 
 static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
 {
+        struct sclp_cpu_entry *cpue;
+        u16 boot_cpu_address, cpu;
+
         if (sclp_read_info_early(sccb))
                 return;
 
@@ -116,6 +121,15 @@ static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
                 sclp_max_cpu = sccb->hcpua + 1;
         }
 
+        boot_cpu_address = stap();
+        cpue = (void *)sccb + sccb->cpuoff;
+        for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
+                if (boot_cpu_address != cpue->address)
+                        continue;
+                sclp_siif = cpue->siif;
+                break;
+        }
+
         /* Save IPL information */
         sclp_ipl_info.is_valid = 1;
         if (sccb->flags & 0x2)
@@ -148,6 +162,12 @@ unsigned int sclp_get_max_cpu(void)
         return sclp_max_cpu;
 }
 
+int sclp_has_siif(void)
+{
+        return sclp_siif;
+}
+EXPORT_SYMBOL(sclp_has_siif);
+
 /*
  * This function will be called after sclp_facilities_detect(), which gets
  * called from early.c code. The sclp_facilities_detect() function retrieves