Merge remote-tracking branch 'remotes/borntraeger/tags/s390x-20150310' into staging

s390x/kvm: Features and fixes for 2.3

- an extension to the elf loader to allow relocations
- make the ccw bios relocatable. This allows for bigger ramdisks
  or smaller guests
- Handle all slow SIGPs in QEMU (instead of kernel) for better
  compliance and correctness
- tell the KVM module the maximum guest size. This allows KVM
  to reduce the number or page table levels
- Several fixes/cleanups

# gpg: Signature made Wed Mar 11 10:17:13 2015 GMT using RSA key ID B5A61C7C
# gpg: Good signature from "Christian Borntraeger (IBM) <borntraeger@de.ibm.com>"

* remotes/borntraeger/tags/s390x-20150310:
  s390-ccw: rebuild BIOS
  s390/bios: Make the s390-ccw.img relocatable
  elf-loader: Provide the possibility to relocate s390 ELF files
  s390-ccw.img: Reinitialize guessing on reboot
  s390-ccw.img: Allow bigger ramdisk sizes or offsets
  s390x/kvm: passing max memory size to accelerator
  virtio-ccw: Convert to realize()
  virtio-s390: Convert to realize()
  virtio-s390: s390_virtio_device_init() can't fail, simplify
  s390x/kvm: enable the new SIGP handling in user space
  s390x/kvm: deliver SIGP RESTART directly if stopped
  s390x: add function to deliver restart irqs
  s390x/kvm: SIGP START is only applicable when STOPPED
  s390x/kvm: implement handling of new SIGP orders
  s390x/kvm: trace all SIGP orders
  s390x/kvm: helper to set the SIGP status in SigpInfo
  s390x/kvm: pass the SIGP instruction parameter to the SIGP handler
  s390x/kvm: more details for SIGP handler with one destination vcpu
  s390x: introduce defines for SIGP condition codes
  synchronize Linux headers to 4.0-rc3

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 105 insertions, 29 deletions

diff --git a/include/elf.h b/include/elf.h
index a516584485..3e75f05afd 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -1508,6 +1508,7 @@ struct elf32_fdpic_loadmap {
 #define elf_shdr	elf32_shdr
 #define elf_sym		elf32_sym
 #define elf_addr_t	Elf32_Off
+#define elf_rela  elf32_rela
 
 #ifdef ELF_USES_RELOCA
 # define ELF_RELOC      Elf32_Rela
@@ -1523,6 +1524,7 @@ struct elf32_fdpic_loadmap {
 #define elf_shdr	elf64_shdr
 #define elf_sym		elf64_sym
 #define elf_addr_t	Elf64_Off
+#define elf_rela  elf64_rela
 
 #ifdef ELF_USES_RELOCA
 # define ELF_RELOC      Elf64_Rela
diff --git a/include/hw/elf_ops.h b/include/hw/elf_ops.h
index a517753a6f..16a627bdeb 100644
--- a/include/hw/elf_ops.h
+++ b/include/hw/elf_ops.h
@@ -49,6 +49,13 @@ static void glue(bswap_sym, SZ)(struct elf_sym *sym)
     bswap16s(&sym->st_shndx);
 }
 
+static void glue(bswap_rela, SZ)(struct elf_rela *rela)
+{
+    bswapSZs(&rela->r_offset);
+    bswapSZs(&rela->r_info);
+    bswapSZs((elf_word *)&rela->r_addend);
+}
+
 static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table,
                                                int n, int type)
 {
@@ -182,6 +189,75 @@ static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
     return -1;
 }
 
+static int glue(elf_reloc, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
+                               uint64_t (*translate_fn)(void *, uint64_t),
+                               void *translate_opaque, uint8_t *data,
+                               struct elf_phdr *ph, int elf_machine)
+{
+    struct elf_shdr *reltab, *shdr_table = NULL;
+    struct elf_rela *rels = NULL;
+    int nrels, i, ret = -1;
+    elf_word wordval;
+    void *addr;
+
+    shdr_table = load_at(fd, ehdr->e_shoff,
+                         sizeof(struct elf_shdr) * ehdr->e_shnum);
+    if (!shdr_table) {
+        return -1;
+    }
+    if (must_swab) {
+        for (i = 0; i < ehdr->e_shnum; i++) {
+            glue(bswap_shdr, SZ)(&shdr_table[i]);
+        }
+    }
+
+    reltab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_RELA);
+    if (!reltab) {
+        goto fail;
+    }
+    rels = load_at(fd, reltab->sh_offset, reltab->sh_size);
+    if (!rels) {
+        goto fail;
+    }
+    nrels = reltab->sh_size / sizeof(struct elf_rela);
+
+    for (i = 0; i < nrels; i++) {
+        if (must_swab) {
+            glue(bswap_rela, SZ)(&rels[i]);
+        }
+        if (rels[i].r_offset < ph->p_vaddr ||
+            rels[i].r_offset >= ph->p_vaddr + ph->p_filesz) {
+            continue;
+        }
+        addr = &data[rels[i].r_offset - ph->p_vaddr];
+        switch (elf_machine) {
+        case EM_S390:
+            switch (rels[i].r_info) {
+            case R_390_RELATIVE:
+                wordval = *(elf_word *)addr;
+                if (must_swab) {
+                    bswapSZs(&wordval);
+                }
+                wordval = translate_fn(translate_opaque, wordval);
+                if (must_swab) {
+                    bswapSZs(&wordval);
+                }
+                *(elf_word *)addr = wordval;
+                break;
+            default:
+                fprintf(stderr, "Unsupported relocation type %i!\n",
+                        (int)rels[i].r_info);
+            }
+        }
+    }
+
+    ret = 0;
+fail:
+    g_free(rels);
+    g_free(shdr_table);
+    return ret;
+}
+
 static int glue(load_elf, SZ)(const char *name, int fd,
                               uint64_t (*translate_fn)(void *, uint64_t),
                               void *translate_opaque,
@@ -271,6 +347,8 @@ static int glue(load_elf, SZ)(const char *name, int fd,
                linked at the wrong physical address.  */
             if (translate_fn) {
                 addr = translate_fn(translate_opaque, ph->p_paddr);
+                glue(elf_reloc, SZ)(&ehdr, fd, must_swab,  translate_fn,
+                                    translate_opaque, data, ph, elf_machine);
             } else {
                 addr = ph->p_paddr;
             }
diff --git a/include/standard-headers/linux/virtio_net.h b/include/standard-headers/linux/virtio_net.h
index 95faf67b48..3209c90219 100644
--- a/include/standard-headers/linux/virtio_net.h
+++ b/include/standard-headers/linux/virtio_net.h
@@ -74,39 +74,12 @@ struct virtio_net_config {
 	uint16_t max_virtqueue_pairs;
 } QEMU_PACKED;
 
-#ifndef VIRTIO_NET_NO_LEGACY
-/* This header comes first in the scatter-gather list.
- * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
- * be the first element of the scatter-gather list.  If you don't
- * specify GSO or CSUM features, you can simply ignore the header. */
-struct virtio_net_hdr {
-#define VIRTIO_NET_HDR_F_NEEDS_CSUM	1	// Use csum_start, csum_offset
-#define VIRTIO_NET_HDR_F_DATA_VALID	2	// Csum is valid
-	uint8_t flags;
-#define VIRTIO_NET_HDR_GSO_NONE		0	// Not a GSO frame
-#define VIRTIO_NET_HDR_GSO_TCPV4	1	// GSO frame, IPv4 TCP (TSO)
-#define VIRTIO_NET_HDR_GSO_UDP		3	// GSO frame, IPv4 UDP (UFO)
-#define VIRTIO_NET_HDR_GSO_TCPV6	4	// GSO frame, IPv6 TCP
-#define VIRTIO_NET_HDR_GSO_ECN		0x80	// TCP has ECN set
-	uint8_t gso_type;
-	__virtio16 hdr_len;		/* Ethernet + IP + tcp/udp hdrs */
-	__virtio16 gso_size;		/* Bytes to append to hdr_len per frame */
-	__virtio16 csum_start;	/* Position to start checksumming from */
-	__virtio16 csum_offset;	/* Offset after that to place checksum */
-};
-
-/* This is the version of the header to use when the MRG_RXBUF
- * feature has been negotiated. */
-struct virtio_net_hdr_mrg_rxbuf {
-	struct virtio_net_hdr hdr;
-	__virtio16 num_buffers;	/* Number of merged rx buffers */
-};
-#else /* ... VIRTIO_NET_NO_LEGACY */
 /*
  * This header comes first in the scatter-gather list.  If you don't
  * specify GSO or CSUM features, you can simply ignore the header.
  *
- * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf.
+ * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
+ * only flattened.
  */
 struct virtio_net_hdr_v1 {
 #define VIRTIO_NET_HDR_F_NEEDS_CSUM	1	/* Use csum_start, csum_offset */
@@ -124,6 +97,29 @@ struct virtio_net_hdr_v1 {
 	__virtio16 csum_offset;	/* Offset after that to place checksum */
 	__virtio16 num_buffers;	/* Number of merged rx buffers */
 };
+
+#ifndef VIRTIO_NET_NO_LEGACY
+/* This header comes first in the scatter-gather list.
+ * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
+ * be the first element of the scatter-gather list.  If you don't
+ * specify GSO or CSUM features, you can simply ignore the header. */
+struct virtio_net_hdr {
+	/* See VIRTIO_NET_HDR_F_* */
+	uint8_t flags;
+	/* See VIRTIO_NET_HDR_GSO_* */
+	uint8_t gso_type;
+	__virtio16 hdr_len;		/* Ethernet + IP + tcp/udp hdrs */
+	__virtio16 gso_size;		/* Bytes to append to hdr_len per frame */
+	__virtio16 csum_start;	/* Position to start checksumming from */
+	__virtio16 csum_offset;	/* Offset after that to place checksum */
+};
+
+/* This is the version of the header to use when the MRG_RXBUF
+ * feature has been negotiated. */
+struct virtio_net_hdr_mrg_rxbuf {
+	struct virtio_net_hdr hdr;
+	__virtio16 num_buffers;	/* Number of merged rx buffers */
+};
 #endif /* ...VIRTIO_NET_NO_LEGACY */
 
 /*