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s390/sclp: introduce checks for ESCA and HVS

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Introduce sclp.has_hvs and sclp.has_esca to provide a way for kvm to check
whether the extended-SCA and the home-virtual-SCA facilities are available.

Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Eugene (jno) Dvurechenski 2014-10-09 16:04:48 +02:00 committed by Christian Borntraeger
parent 71f116bfed
commit f7ba1d3426
2 changed files with 8 additions and 1 deletions
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2
arch/s390/include/asm/sclp.h
View File

@ -53,6 +53,8 @@ struct sclp_info {
unsigned char has_sigpif : 1; unsigned char has_sigpif : 1;
unsigned char has_core_type : 1; unsigned char has_core_type : 1;
unsigned char has_sprp : 1; unsigned char has_sprp : 1;
unsigned char has_hvs : 1;
unsigned char has_esca : 1;
unsigned int ibc; unsigned int ibc;
unsigned int mtid; unsigned int mtid;
unsigned int mtid_cp; unsigned int mtid_cp;

7
drivers/s390/char/sclp_early.c
View File

@ -43,7 +43,10 @@ struct read_info_sccb {
u8 _pad_92[100 - 92]; /* 92-99 */ u8 _pad_92[100 - 92]; /* 92-99 */
u32 rnsize2; /* 100-103 */ u32 rnsize2; /* 100-103 */
u64 rnmax2; /* 104-111 */ u64 rnmax2; /* 104-111 */
u8 _pad_112[120 - 112]; /* 112-119 */ u8 _pad_112[116 - 112]; /* 112-115 */
u8 fac116; /* 116 */
u8 _pad_117[119 - 117]; /* 117-118 */
u8 fac119; /* 119 */
u16 hcpua; /* 120-121 */ u16 hcpua; /* 120-121 */
u8 _pad_122[4096 - 122]; /* 122-4095 */ u8 _pad_122[4096 - 122]; /* 122-4095 */
} __packed __aligned(PAGE_SIZE); } __packed __aligned(PAGE_SIZE);
@ -108,6 +111,8 @@ static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
sclp.facilities = sccb->facilities; sclp.facilities = sccb->facilities;
sclp.has_sprp = !!(sccb->fac84 & 0x02); sclp.has_sprp = !!(sccb->fac84 & 0x02);
sclp.has_core_type = !!(sccb->fac84 & 0x01); sclp.has_core_type = !!(sccb->fac84 & 0x01);
sclp.has_esca = !!(sccb->fac116 & 0x08);
sclp.has_hvs = !!(sccb->fac119 & 0x80);
if (sccb->fac85 & 0x02) if (sccb->fac85 & 0x02)
S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;