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authorDavid Gibson <david@gibson.dropbear.id.au>2011-04-01 15:15:34 +1100
committerAlexander Graf <agraf@suse.de>2011-04-01 18:34:57 +0200
commita9f8ad8f2acdb2398da5d32a5efc19cb0196d79f (patch)
treea217360c44ef60c2ad654ecd3cd4836281e29c1f /hw/spapr.c
parented120055c7f9b26b5707d3ceabbe5a3f06aaf937 (diff)
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Add SLOF-based partition firmware for pSeries machine, allowing more boot options
Currently, the emulated pSeries machine requires the use of the -kernel parameter in order to explicitly load a guest kernel. This means booting from the virtual disk, cdrom or network is not possible. This patch addresses this limitation by inserting a within-partition firmware image (derived from the "SLOF" free Open Firmware project). If -kernel is not specified, qemu will now load the SLOF image, which has access to the qemu boot device list through the device tree, and can boot from any of the usual virtual devices. In order to support the new firmware, an extension to the emulated machine/hypervisor is necessary. Unlike Linux, which expects multi-CPU entry to be handled kexec() style, the SLOF firmware expects only one CPU to be active at entry, and to use a hypervisor RTAS method to enable the other CPUs one by one. This patch also implements this 'start-cpu' method, so that SLOF can start the secondary CPUs and marshal them into the kexec() holding pattern ready for entry into the guest OS. Linux should, and in the future might directly use the start-cpu method to enable initially disabled CPUs, but for now it does require kexec() entry. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'hw/spapr.c')
-rw-r--r--hw/spapr.c35
1 files changed, 31 insertions, 4 deletions
diff --git a/hw/spapr.c b/hw/spapr.c
index 8767686..1152a25 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -44,6 +44,10 @@
#define INITRD_LOAD_ADDR 0x02800000
#define FDT_MAX_SIZE 0x10000
#define RTAS_MAX_SIZE 0x10000
+#define FW_MAX_SIZE 0x400000
+#define FW_FILE_NAME "slof.bin"
+
+#define MIN_RAM_SLOF 512UL
#define TIMEBASE_FREQ 512000000ULL
@@ -57,6 +61,7 @@ static void *spapr_create_fdt(int *fdt_size, ram_addr_t ramsize,
sPAPREnvironment *spapr,
target_phys_addr_t initrd_base,
target_phys_addr_t initrd_size,
+ const char *boot_device,
const char *kernel_cmdline,
target_phys_addr_t rtas_addr,
target_phys_addr_t rtas_size,
@@ -105,6 +110,7 @@ static void *spapr_create_fdt(int *fdt_size, ram_addr_t ramsize,
&start_prop, sizeof(start_prop))));
_FDT((fdt_property(fdt, "linux,initrd-end",
&end_prop, sizeof(end_prop))));
+ _FDT((fdt_property_string(fdt, "qemu,boot-device", boot_device)));
_FDT((fdt_end_node(fdt)));
@@ -261,7 +267,7 @@ static void ppc_spapr_init(ram_addr_t ram_size,
ram_addr_t ram_offset;
target_phys_addr_t fdt_addr, rtas_addr;
uint32_t kernel_base, initrd_base;
- long kernel_size, initrd_size, htab_size, rtas_size;
+ long kernel_size, initrd_size, htab_size, rtas_size, fw_size;
long pteg_shift = 17;
int fdt_size;
char *filename;
@@ -392,13 +398,33 @@ static void ppc_spapr_init(ram_addr_t ram_size,
initrd_size = 0;
}
} else {
- fprintf(stderr, "pSeries machine needs -kernel for now");
- exit(1);
+ if (ram_size < (MIN_RAM_SLOF << 20)) {
+ fprintf(stderr, "qemu: pSeries SLOF firmware requires >= "
+ "%ldM guest RAM\n", MIN_RAM_SLOF);
+ exit(1);
+ }
+ filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, "slof.bin");
+ fw_size = load_image_targphys(filename, 0, FW_MAX_SIZE);
+ if (fw_size < 0) {
+ hw_error("qemu: could not load LPAR rtas '%s'\n", filename);
+ exit(1);
+ }
+ qemu_free(filename);
+ kernel_base = 0x100;
+ initrd_base = 0;
+ initrd_size = 0;
+
+ /* SLOF will startup the secondary CPUs using RTAS,
+ rather than expecting a kexec() style entry */
+ for (i = 0; i < smp_cpus; i++) {
+ envs[i]->halted = 1;
+ }
}
/* Prepare the device tree */
fdt = spapr_create_fdt(&fdt_size, ram_size, cpu_model, envs, spapr,
- initrd_base, initrd_size, kernel_cmdline,
+ initrd_base, initrd_size,
+ boot_device, kernel_cmdline,
rtas_addr, rtas_size, pteg_shift + 7);
assert(fdt != NULL);
@@ -409,6 +435,7 @@ static void ppc_spapr_init(ram_addr_t ram_size,
envs[0]->gpr[3] = fdt_addr;
envs[0]->gpr[5] = 0;
envs[0]->hreset_vector = kernel_base;
+ envs[0]->halted = 0;
}
static QEMUMachine spapr_machine = {