s390/ipl: fix virtual vs physical address confusion

The value of ipl_cert_list_addr boot variable contains
a physical address, which is used directly. That works
because virtual and physical address spaces are currently
the same, but otherwise it is wrong.

While at it, fix also a comment for the platform keyring.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/20230816132942.2540411-1-agordeev@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: Alexander Gordeev

arch/s390/kernel/machine_kexec_file.c

@@ -188,7 +188,7 @@ static int kexec_file_add_ipl_report(struct kimage *image,
 	data->memsz = ALIGN(data->memsz, PAGE_SIZE);
 	buf.mem = data->memsz;
 
-	ptr = (void *)ipl_cert_list_addr;
+	ptr = __va(ipl_cert_list_addr);
 	end = ptr + ipl_cert_list_size;
 	ncerts = 0;
 	while (ptr < end) {
@@ -200,7 +200,7 @@ static int kexec_file_add_ipl_report(struct kimage *image,
 
 	addr = data->memsz + data->report->size;
 	addr += ncerts * sizeof(struct ipl_rb_certificate_entry);
-	ptr = (void *)ipl_cert_list_addr;
+	ptr = __va(ipl_cert_list_addr);
 	while (ptr < end) {
 		len = *(unsigned int *)ptr;
 		ptr += sizeof(len);

arch/s390/kernel/setup.c

@@ -875,7 +875,7 @@ static void __init log_component_list(void)
 		pr_info("Linux is running with Secure-IPL enabled\n");
 	else
 		pr_info("Linux is running with Secure-IPL disabled\n");
-	ptr = (void *) early_ipl_comp_list_addr;
+	ptr = __va(early_ipl_comp_list_addr);
 	end = (void *) ptr + early_ipl_comp_list_size;
 	pr_info("The IPL report contains the following components:\n");
 	while (ptr < end) {

security/integrity/platform_certs/load_ipl_s390.c

@@ -22,8 +22,8 @@ static int __init load_ipl_certs(void)
 
 	if (!ipl_cert_list_addr)
 		return 0;
-	/* Copy the certificates to the system keyring */
-	ptr = (void *) ipl_cert_list_addr;
+	/* Copy the certificates to the platform keyring */
+	ptr = __va(ipl_cert_list_addr);
 	end = ptr + ipl_cert_list_size;
 	while ((void *) ptr < end) {
 		len = *(unsigned int *) ptr;