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s390x/cpumodel: take care of the cpuid format bit for KVM 

Let's also properly forward that bit. It should always be set. I
verified it under z/VM, it seems to be always set there. For now,
zKVM guests never get that bit set when the CPU model is active.

The PoP mentiones, that z800 + z900 (HW generation 7) always set this
bit to 0, so let's take care of that.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170531193434.6918-2-david@redhat.com>
Acked-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2017-05-31 21:34:33 +02:00 committed by Christian Borntraeger
parent c68f4503e0
commit 64bc98f4b9
3 changed files with 9 additions and 3 deletions
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1
target/s390x/cpu_models.c
View File

@ -740,6 +740,7 @@ void s390_realize_cpu_model(CPUState *cs, Error **errp)
/* copy over properties that can vary */
cpu->model->lowest_ibc = max_model->lowest_ibc;
cpu->model->cpu_id = max_model->cpu_id;
cpu->model->cpu_id_format = max_model->cpu_id_format;
cpu->model->cpu_ver = max_model->cpu_ver;
check_consistency(cpu->model);

10
target/s390x/cpu_models.h
View File

@ -46,6 +46,7 @@ typedef struct S390CPUModel {
/* values copied from the "host" model, can change during migration */
uint16_t lowest_ibc; /* lowest IBC that the hardware supports */
uint32_t cpu_id; /* CPU id */
uint8_t cpu_id_format; /* CPU id format bit */
uint8_t cpu_ver; /* CPU version, usually "ff" for kvm */
} S390CPUModel;
@ -54,12 +55,14 @@ typedef struct S390CPUModel {
*
* bits 0-7: Zeroes (ff for kvm)
* bits 8-31: CPU ID (serial number)
* bits 32-48: Machine type
* bits 48-63: Zeroes
* bits 32-47: Machine type
* bit 48: CPU ID format
* bits 49-63: Zeroes
*/
#define cpuid_type(x) (((x) >> 16) & 0xffff)
#define cpuid_id(x) (((x) >> 32) & 0xffffff)
#define cpuid_ver(x) (((x) >> 56) & 0xff)
#define cpuid_format(x) (((x) >> 15) & 0x1)
#define lowest_ibc(x) (((uint32_t)(x) >> 16) & 0xfff)
#define unblocked_ibc(x) ((uint32_t)(x) & 0xfff)
@ -92,7 +95,8 @@ static inline uint64_t s390_cpuid_from_cpu_model(const S390CPUModel *model)
{
return ((uint64_t)model->cpu_ver << 56) |
((uint64_t)model->cpu_id << 32) |
((uint64_t)model->def->type << 16);
((uint64_t)model->def->type << 16) |
(model->def->gen == 7 ? 0 : (uint64_t)model->cpu_id_format << 15);
}
S390CPUDef const *s390_find_cpu_def(uint16_t type, uint8_t gen, uint8_t ec_ga,
S390FeatBitmap features);

1
target/s390x/kvm.c
View File

@ -2580,6 +2580,7 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
unblocked_ibc = unblocked_ibc(prop.ibc);
}
model->cpu_id = cpuid_id(prop.cpuid);
model->cpu_id_format = cpuid_format(prop.cpuid);
model->cpu_ver = 0xff;
/* get supported cpu features indicated via STFL(E) */