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s390x: fix memory detection for guests > 64GB 

the s390 memory detection has a 16bit field that specifies the amount of
increments. This patch adopts the memory size to always fit into that
scheme. This also fixes virtio detection for these guests, since the
descriptor page is located after the main memory.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Christian Borntraeger 2011-05-12 10:50:44 +02:00 committed by Alexander Graf
parent ff83678aee
commit 22486aa04a
2 changed files with 21 additions and 7 deletions
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20
hw/s390-virtio.c
View File

@ -131,7 +131,7 @@ int s390_virtio_hypercall(CPUState *env, uint64_t mem, uint64_t hypercall)
}
/* PC hardware initialisation */
static void s390_init(ram_addr_t ram_size,
static void s390_init(ram_addr_t my_ram_size,
const char *boot_device,
const char *kernel_filename,
const char *kernel_cmdline,
@ -143,19 +143,29 @@ static void s390_init(ram_addr_t ram_size,
ram_addr_t kernel_size = 0;
ram_addr_t initrd_offset;
ram_addr_t initrd_size = 0;
int shift = 0;
uint8_t *storage_keys;
int i;
/* s390x ram size detection needs a 16bit multiplier + an increment. So
guests > 64GB can be specified in 2MB steps etc. */
while ((my_ram_size >> (20 + shift)) > 65535) {
shift++;
}
my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
/* lets propagate the changed ram size into the global variable. */
ram_size = my_ram_size;
/* get a BUS */
s390_bus = s390_virtio_bus_init(&ram_size);
s390_bus = s390_virtio_bus_init(&my_ram_size);
/* allocate RAM */
ram_addr = qemu_ram_alloc(NULL, "s390.ram", ram_size);
cpu_register_physical_memory(0, ram_size, ram_addr);
ram_addr = qemu_ram_alloc(NULL, "s390.ram", my_ram_size);
cpu_register_physical_memory(0, my_ram_size, ram_addr);
/* allocate storage keys */
storage_keys = qemu_mallocz(ram_size / TARGET_PAGE_SIZE);
storage_keys = qemu_mallocz(my_ram_size / TARGET_PAGE_SIZE);
/* init CPUs */
if (cpu_model == NULL) {

8
target-s390x/op_helper.c
View File

@ -2361,6 +2361,7 @@ static void ext_interrupt(CPUState *env, int type, uint32_t param,
int sclp_service_call(CPUState *env, uint32_t sccb, uint64_t code)
{
int r = 0;
int shift = 0;
#ifdef DEBUG_HELPER
printf("sclp(0x%x, 0x%" PRIx64 ")\n", sccb, code);
@ -2375,8 +2376,11 @@ int sclp_service_call(CPUState *env, uint32_t sccb, uint64_t code)
switch(code) {
case SCLP_CMDW_READ_SCP_INFO:
case SCLP_CMDW_READ_SCP_INFO_FORCED:
stw_phys(sccb + SCP_MEM_CODE, ram_size >> 20);
stb_phys(sccb + SCP_INCREMENT, 1);
while ((ram_size >> (20 + shift)) > 65535) {
shift++;
}
stw_phys(sccb + SCP_MEM_CODE, ram_size >> (20 + shift));
stb_phys(sccb + SCP_INCREMENT, 1 << shift);
stw_phys(sccb + SCP_RESPONSE_CODE, 0x10);
if (kvm_enabled()) {