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Commit c9896acc authored by Philipp Rudo's avatar Philipp Rudo Committed by Martin Schwidefsky
Browse files

s390/ipl: Provide has_secure sysfs attribute 



Provide an interface for userspace so it can find out if a machine is
capeable of doing secure boot. The interface is, for example, needed for
zipl so it can find out which file format it can/should write to disk.

Signed-off-by: default avatarPhilipp Rudo <prudo@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 268a7840

arch/s390/include/asm/sclp.h

+2 −0
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ struct sclp_info { 
	unsigned char has_kss : 1;

	unsigned char has_gisaf : 1;

	unsigned char has_diag318 : 1;

	unsigned char has_sipl : 1;

	unsigned char has_sipl_g2 : 1;

	unsigned int ibc;

	unsigned int mtid;

	unsigned int mtid_cp;

arch/s390/kernel/ipl.c

+17 −0
Original line number Diff line number Diff line
@@ -283,6 +283,20 @@ static ssize_t ipl_secure_show(struct kobject *kobj, 
static struct kobj_attribute sys_ipl_secure_attr =

	__ATTR(secure, 0444, ipl_secure_show, NULL);



static ssize_t ipl_has_secure_show(struct kobject *kobj,

				   struct kobj_attribute *attr, char *page)

{

	if (MACHINE_IS_LPAR)

		return sprintf(page, "%i\n", !!sclp.has_sipl);

	else if (MACHINE_IS_VM)

		return sprintf(page, "%i\n", !!sclp.has_sipl_g2);

	else

		return sprintf(page, "%i\n", 0);

}



static struct kobj_attribute sys_ipl_has_secure_attr =

	__ATTR(has_secure, 0444, ipl_has_secure_show, NULL);



static ssize_t ipl_vm_parm_show(struct kobject *kobj,

				struct kobj_attribute *attr, char *page)

{
@@ -379,6 +393,7 @@ static struct attribute *ipl_fcp_attrs[] = { 
	&sys_ipl_fcp_br_lba_attr.attr,

	&sys_ipl_ccw_loadparm_attr.attr,

	&sys_ipl_secure_attr.attr,

	&sys_ipl_has_secure_attr.attr,

	NULL,

};
@@ -395,6 +410,7 @@ static struct attribute *ipl_ccw_attrs_vm[] = { 
	&sys_ipl_ccw_loadparm_attr.attr,

	&sys_ipl_vm_parm_attr.attr,

	&sys_ipl_secure_attr.attr,

	&sys_ipl_has_secure_attr.attr,

	NULL,

};
@@ -403,6 +419,7 @@ static struct attribute *ipl_ccw_attrs_lpar[] = { 
	&sys_ipl_device_attr.attr,

	&sys_ipl_ccw_loadparm_attr.attr,

	&sys_ipl_secure_attr.attr,

	&sys_ipl_has_secure_attr.attr,

	NULL,

};

drivers/s390/char/sclp.h

+3 −1
Original line number Diff line number Diff line
@@ -197,7 +197,9 @@ struct read_info_sccb { 
	u32	hmfai;			/* 124-127 */

	u8	_pad_128[134 - 128];	/* 128-133 */

	u8	byte_134;			/* 134 */

	u8	_pad_135[4096 - 135];	/* 135-4095 */

	u8	_pad_135;		/* 135 */

	u16	cbl;			/* 136-137 */

	u8	_pad_138[4096 - 138];	/* 138-4095 */

} __packed __aligned(PAGE_SIZE);



struct read_storage_sccb {

drivers/s390/char/sclp_early.c

+2 −0
Original line number Diff line number Diff line
@@ -40,6 +40,8 @@ static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb) 
	sclp.has_gisaf = !!(sccb->fac118 & 0x08);

	sclp.has_hvs = !!(sccb->fac119 & 0x80);

	sclp.has_kss = !!(sccb->fac98 & 0x01);

	sclp.has_sipl = !!(sccb->cbl & 0x02);

	sclp.has_sipl_g2 = !!(sccb->cbl & 0x04);

	if (sccb->fac85 & 0x02)

		S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;

	if (sccb->fac91 & 0x40)