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Commit 937347ac authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

s390/ipl: add helper functions to create an IPL report 



PR: Adjusted to the use in kexec_file later.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarPhilipp Rudo <prudo@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 9641b8cc

arch/s390/include/asm/ipl.h

+27 −0
Original line number Diff line number Diff line
@@ -81,6 +81,33 @@ extern struct ipl_info ipl_info; 
extern void setup_ipl(void);

extern void set_os_info_reipl_block(void);



struct ipl_report {

	struct ipl_parameter_block *ipib;

	struct list_head components;

	struct list_head certificates;

	size_t size;

};



struct ipl_report_component {

	struct list_head list;

	struct ipl_rb_component_entry entry;

};



struct ipl_report_certificate {

	struct list_head list;

	struct ipl_rb_certificate_entry entry;

	void *key;

};



struct kexec_buf;

struct ipl_report *ipl_report_init(struct ipl_parameter_block *ipib);

void *ipl_report_finish(struct ipl_report *report);

int ipl_report_free(struct ipl_report *report);

int ipl_report_add_component(struct ipl_report *report, struct kexec_buf *kbuf,

			     unsigned char flags, unsigned short cert);

int ipl_report_add_certificate(struct ipl_report *report, void *key,

			       unsigned long addr, unsigned long len);



/*

 * DIAG 308 support

 */

arch/s390/kernel/ipl.c

+134 −0
Original line number Diff line number Diff line
@@ -1705,3 +1705,137 @@ void s390_reset_system(void) 
	__ctl_clear_bit(0, 28);

	diag308_reset();

}



#ifdef CONFIG_KEXEC_FILE



int ipl_report_add_component(struct ipl_report *report, struct kexec_buf *kbuf,

			     unsigned char flags, unsigned short cert)

{

	struct ipl_report_component *comp;



	comp = vzalloc(sizeof(*comp));

	if (!comp)

		return -ENOMEM;

	list_add_tail(&comp->list, &report->components);



	comp->entry.addr = kbuf->mem;

	comp->entry.len = kbuf->memsz;

	comp->entry.flags = flags;

	comp->entry.certificate_index = cert;



	report->size += sizeof(comp->entry);



	return 0;

}



int ipl_report_add_certificate(struct ipl_report *report, void *key,

			       unsigned long addr, unsigned long len)

{

	struct ipl_report_certificate *cert;



	cert = vzalloc(sizeof(*cert));

	if (!cert)

		return -ENOMEM;

	list_add_tail(&cert->list, &report->certificates);



	cert->entry.addr = addr;

	cert->entry.len = len;

	cert->key = key;



	report->size += sizeof(cert->entry);

	report->size += cert->entry.len;



	return 0;

}



struct ipl_report *ipl_report_init(struct ipl_parameter_block *ipib)

{

	struct ipl_report *report;



	report = vzalloc(sizeof(*report));

	if (!report)

		return ERR_PTR(-ENOMEM);



	report->ipib = ipib;

	INIT_LIST_HEAD(&report->components);

	INIT_LIST_HEAD(&report->certificates);



	report->size = ALIGN(ipib->hdr.len, 8);

	report->size += sizeof(struct ipl_rl_hdr);

	report->size += sizeof(struct ipl_rb_components);

	report->size += sizeof(struct ipl_rb_certificates);



	return report;

}



void *ipl_report_finish(struct ipl_report *report)

{

	struct ipl_report_certificate *cert;

	struct ipl_report_component *comp;

	struct ipl_rb_certificates *certs;

	struct ipl_parameter_block *ipib;

	struct ipl_rb_components *comps;

	struct ipl_rl_hdr *rl_hdr;

	void *buf, *ptr;



	buf = vzalloc(report->size);

	if (!buf)

		return ERR_PTR(-ENOMEM);

	ptr = buf;



	memcpy(ptr, report->ipib, report->ipib->hdr.len);

	ipib = ptr;

	if (ipl_secure_flag)

		ipib->hdr.flags |= IPL_PL_FLAG_SIPL;

	ipib->hdr.flags |= IPL_PL_FLAG_IPLSR;

	ptr += report->ipib->hdr.len;

	ptr = PTR_ALIGN(ptr, 8);



	rl_hdr = ptr;

	ptr += sizeof(*rl_hdr);



	comps = ptr;

	comps->rbt = IPL_RBT_COMPONENTS;

	ptr += sizeof(*comps);

	list_for_each_entry(comp, &report->components, list) {

		memcpy(ptr, &comp->entry, sizeof(comp->entry));

		ptr += sizeof(comp->entry);

	}

	comps->len = ptr - (void *)comps;



	certs = ptr;

	certs->rbt = IPL_RBT_CERTIFICATES;

	ptr += sizeof(*certs);

	list_for_each_entry(cert, &report->certificates, list) {

		memcpy(ptr, &cert->entry, sizeof(cert->entry));

		ptr += sizeof(cert->entry);

	}

	certs->len = ptr - (void *)certs;

	rl_hdr->len = ptr - (void *)rl_hdr;



	list_for_each_entry(cert, &report->certificates, list) {

		memcpy(ptr, cert->key, cert->entry.len);

		ptr += cert->entry.len;

	}



	BUG_ON(ptr > buf + report->size);

	return buf;

}



int ipl_report_free(struct ipl_report *report)

{

	struct ipl_report_component *comp, *ncomp;

	struct ipl_report_certificate *cert, *ncert;



	list_for_each_entry_safe(comp, ncomp, &report->components, list)

		vfree(comp);



	list_for_each_entry_safe(cert, ncert, &report->certificates, list)

		vfree(cert);



	vfree(report);



	return 0;

}



#endif