s390/protvirt: add memory sharing for diag 308 set/store

Add sharing of ipl parameter block for diag 308 set/store calls to allow
kvm access in protected virtualization environment.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c
index dc0438d..385d0c7 100644 (file)
--- a/arch/s390/boot/ipl_parm.c
+++ b/arch/s390/boot/ipl_parm.c
@@ -7,6 +7,7 @@
 #include <asm/sections.h>
 #include <asm/boot_data.h>
 #include <asm/facility.h>
+#include <asm/uv.h>
 #include "boot.h"
 
 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
@@ -45,7 +46,9 @@ void store_ipl_parmblock(void)
 {
        int rc;
 
+       uv_set_shared(__pa(&ipl_block));
        rc = __diag308(DIAG308_STORE, &ipl_block);
+       uv_remove_shared(__pa(&ipl_block));
        if (rc == DIAG308_RC_OK &&
            ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
                ipl_block_valid = 1;

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index d2e8dc6..cffe337 100644 (file)
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -31,6 +31,7 @@
 #include <asm/os_info.h>
 #include <asm/sections.h>
 #include <asm/boot_data.h>
+#include <asm/uv.h>
 #include "entry.h"
 
 #define IPL_PARM_BLOCK_VERSION 0
@@ -863,15 +864,21 @@ static void __reipl_run(void *unused)
 {
        switch (reipl_type) {
        case IPL_TYPE_CCW:
+               uv_set_shared(__pa(reipl_block_ccw));
                diag308(DIAG308_SET, reipl_block_ccw);
+               uv_remove_shared(__pa(reipl_block_ccw));
                diag308(DIAG308_LOAD_CLEAR, NULL);
                break;
        case IPL_TYPE_FCP:
+               uv_set_shared(__pa(reipl_block_fcp));
                diag308(DIAG308_SET, reipl_block_fcp);
+               uv_remove_shared(__pa(reipl_block_fcp));
                diag308(DIAG308_LOAD_CLEAR, NULL);
                break;
        case IPL_TYPE_NSS:
+               uv_set_shared(__pa(reipl_block_nss));
                diag308(DIAG308_SET, reipl_block_nss);
+               uv_remove_shared(__pa(reipl_block_nss));
                diag308(DIAG308_LOAD_CLEAR, NULL);
                break;
        case IPL_TYPE_UNKNOWN:
@@ -1142,7 +1149,9 @@ static struct kset *dump_kset;
 
 static void diag308_dump(void *dump_block)
 {
+       uv_set_shared(__pa(dump_block));
        diag308(DIAG308_SET, dump_block);
+       uv_remove_shared(__pa(dump_block));
        while (1) {
                if (diag308(DIAG308_LOAD_NORMAL_DUMP, NULL) != 0x302)
                        break;