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authorFarhan Ali <alifm@linux.vnet.ibm.com>2016-10-20 17:59:20 -0400
committerCornelia Huck <cornelia.huck@de.ibm.com>2017-02-28 12:04:48 +0100
commitf38b5b7fc4e27724afc72b91efa2bc82f84bb25e (patch)
tree6301e09119bcb32eef1993d7c2709742ecaa2b39
parent5f31ade055dfb9da9d04fe826374ed5f91dd5d24 (diff)
s390x/ipl: Load network boot image
Load the network boot image into guest RAM when the boot device selected is a network device. Use some of the reserved space in IplBlockCcw to store the start address of the netboot image. A user could also use 'chreipl'(diag 308/5) to change the boot device. So every time we update the IPLB, we need to verify if the selected boot device is a network device so we can appropriately load the network boot image. Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
-rw-r--r--hw/s390x/ipl.c89
-rw-r--r--hw/s390x/ipl.h4
2 files changed, 92 insertions, 1 deletions
diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index fd656718a7..7978c7d52a 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -20,6 +20,7 @@
#include "hw/s390x/virtio-ccw.h"
#include "hw/s390x/css.h"
#include "ipl.h"
+#include "qemu/error-report.h"
#define KERN_IMAGE_START 0x010000UL
#define KERN_PARM_AREA 0x010480UL
@@ -227,6 +228,12 @@ static bool s390_gen_initial_iplb(S390IPLState *ipl)
TYPE_VIRTIO_CCW_DEVICE);
SCSIDevice *sd = (SCSIDevice *) object_dynamic_cast(OBJECT(dev_st),
TYPE_SCSI_DEVICE);
+ VirtIONet *vn = (VirtIONet *) object_dynamic_cast(OBJECT(dev_st),
+ TYPE_VIRTIO_NET);
+
+ if (vn) {
+ ipl->netboot = true;
+ }
if (virtio_ccw_dev) {
CcwDevice *ccw_dev = CCW_DEVICE(virtio_ccw_dev);
@@ -259,12 +266,86 @@ static bool s390_gen_initial_iplb(S390IPLState *ipl)
return false;
}
+static int load_netboot_image(Error **errp)
+{
+ S390IPLState *ipl = get_ipl_device();
+ char *netboot_filename;
+ MemoryRegion *sysmem = get_system_memory();
+ MemoryRegion *mr = NULL;
+ void *ram_ptr = NULL;
+ int img_size = -1;
+
+ mr = memory_region_find(sysmem, 0, 1).mr;
+ if (!mr) {
+ error_setg(errp, "Failed to find memory region at address 0");
+ return -1;
+ }
+
+ ram_ptr = memory_region_get_ram_ptr(mr);
+ if (!ram_ptr) {
+ error_setg(errp, "No RAM found");
+ goto unref_mr;
+ }
+
+ netboot_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, ipl->netboot_fw);
+ if (netboot_filename == NULL) {
+ error_setg(errp, "Could not find network bootloader");
+ goto unref_mr;
+ }
+
+ img_size = load_elf_ram(netboot_filename, NULL, NULL, &ipl->start_addr,
+ NULL, NULL, 1, EM_S390, 0, 0, NULL, false);
+
+ if (img_size < 0) {
+ img_size = load_image_size(netboot_filename, ram_ptr, ram_size);
+ ipl->start_addr = KERN_IMAGE_START;
+ }
+
+ if (img_size < 0) {
+ error_setg(errp, "Failed to load network bootloader");
+ }
+
+ g_free(netboot_filename);
+
+unref_mr:
+ memory_region_unref(mr);
+ return img_size;
+}
+
+static bool is_virtio_net_device(IplParameterBlock *iplb)
+{
+ uint8_t cssid;
+ uint8_t ssid;
+ uint16_t devno;
+ uint16_t schid;
+ SubchDev *sch = NULL;
+
+ if (iplb->pbt != S390_IPL_TYPE_CCW) {
+ return false;
+ }
+
+ devno = be16_to_cpu(iplb->ccw.devno);
+ ssid = iplb->ccw.ssid & 3;
+
+ for (schid = 0; schid < MAX_SCHID; schid++) {
+ for (cssid = 0; cssid < MAX_CSSID; cssid++) {
+ sch = css_find_subch(1, cssid, ssid, schid);
+
+ if (sch && sch->devno == devno) {
+ return sch->id.cu_model == VIRTIO_ID_NET;
+ }
+ }
+ }
+ return false;
+}
+
void s390_ipl_update_diag308(IplParameterBlock *iplb)
{
S390IPLState *ipl = get_ipl_device();
ipl->iplb = *iplb;
ipl->iplb_valid = true;
+ ipl->netboot = is_virtio_net_device(iplb);
}
IplParameterBlock *s390_ipl_get_iplb(void)
@@ -288,6 +369,7 @@ void s390_reipl_request(void)
void s390_ipl_prepare_cpu(S390CPU *cpu)
{
S390IPLState *ipl = get_ipl_device();
+ Error *err = NULL;
cpu->env.psw.addr = ipl->start_addr;
cpu->env.psw.mask = IPL_PSW_MASK;
@@ -298,6 +380,13 @@ void s390_ipl_prepare_cpu(S390CPU *cpu)
ipl->iplb_valid = s390_gen_initial_iplb(ipl);
}
}
+ if (ipl->netboot) {
+ if (load_netboot_image(&err) < 0) {
+ error_report_err(err);
+ vm_stop(RUN_STATE_INTERNAL_ERROR);
+ }
+ ipl->iplb.ccw.netboot_start_addr = ipl->start_addr;
+ }
}
static void s390_ipl_reset(DeviceState *dev)
diff --git a/hw/s390x/ipl.h b/hw/s390x/ipl.h
index 4ad9a7c05e..46930e4c64 100644
--- a/hw/s390x/ipl.h
+++ b/hw/s390x/ipl.h
@@ -16,7 +16,8 @@
#include "cpu.h"
struct IplBlockCcw {
- uint8_t reserved0[85];
+ uint64_t netboot_start_addr;
+ uint8_t reserved0[77];
uint8_t ssid;
uint16_t devno;
uint8_t vm_flags;
@@ -100,6 +101,7 @@ struct S390IPLState {
IplParameterBlock iplb;
bool iplb_valid;
bool reipl_requested;
+ bool netboot;
/*< public >*/
char *kernel;