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KVM: s390: Introduce new structures 

This patch adds new structures and updates some existing ones to
provide the base for Extended SCA functionality.

The old sca_* structures were renamed to bsca_* to keep things uniform.

The access to fields of SIGP controls were turned into bitfields instead
of hardcoded bitmasks.

Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Eugene (jno) Dvurechenski 2015-04-23 16:09:06 +02:00 committed by Christian Borntraeger
parent a6e2f683e7
commit bc784ccee5
4 changed files with 70 additions and 26 deletions
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47
arch/s390/include/asm/kvm_host.h
View File

@ -25,7 +25,9 @@
#include <asm/fpu/api.h>
#include <asm/isc.h>
#define KVM_MAX_VCPUS 64
#define KVM_S390_BSCA_CPU_SLOTS 64
#define KVM_S390_ESCA_CPU_SLOTS 248
#define KVM_MAX_VCPUS KVM_S390_BSCA_CPU_SLOTS
#define KVM_USER_MEM_SLOTS 32
/*
@ -40,9 +42,34 @@
#define SIGP_CTRL_C 0x80
#define SIGP_CTRL_SCN_MASK 0x3f
struct sca_entry {
union bsca_sigp_ctrl {
__u8 value;
struct {
__u8 c : 1;
__u8 r : 1;
__u8 scn : 6;
};
} __packed;
union esca_sigp_ctrl {
__u16 value;
struct {
__u8 c : 1;
__u8 reserved: 7;
__u8 scn;
};
} __packed;
struct esca_entry {
union esca_sigp_ctrl sigp_ctrl;
__u16 reserved1[3];
__u64 sda;
__u64 reserved2[6];
} __packed;
struct bsca_entry {
__u8 reserved0;
__u8 sigp_ctrl;
union bsca_sigp_ctrl sigp_ctrl;
__u16 reserved[3];
__u64 sda;
__u64 reserved2[2];
@ -57,14 +84,22 @@ union ipte_control {
};
};
struct sca_block {
struct bsca_block {
union ipte_control ipte_control;
__u64 reserved[5];
__u64 mcn;
__u64 reserved2;
struct sca_entry cpu[64];
struct bsca_entry cpu[KVM_S390_BSCA_CPU_SLOTS];
} __attribute__((packed));
struct esca_block {
union ipte_control ipte_control;
__u64 reserved1[7];
__u64 mcn[4];
__u64 reserved2[20];
struct esca_entry cpu[KVM_S390_ESCA_CPU_SLOTS];
} __packed;
#define CPUSTAT_STOPPED 0x80000000
#define CPUSTAT_WAIT 0x10000000
#define CPUSTAT_ECALL_PEND 0x08000000
@ -585,7 +620,7 @@ struct kvm_s390_crypto_cb {
};
struct kvm_arch{
struct sca_block *sca;
struct bsca_block *sca;
debug_info_t *dbf;
struct kvm_s390_float_interrupt float_int;
struct kvm_device *flic;

31
arch/s390/kvm/interrupt.c
View File

@ -37,25 +37,32 @@
/* handle external calls via sigp interpretation facility */
static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
{
struct sca_block *sca = vcpu->kvm->arch.sca;
uint8_t sigp_ctrl = sca->cpu[vcpu->vcpu_id].sigp_ctrl;
struct bsca_block *sca = vcpu->kvm->arch.sca;
union bsca_sigp_ctrl sigp_ctrl = sca->cpu[vcpu->vcpu_id].sigp_ctrl;
if (src_id)
*src_id = sigp_ctrl & SIGP_CTRL_SCN_MASK;
*src_id = sigp_ctrl.scn;
return sigp_ctrl & SIGP_CTRL_C &&
return sigp_ctrl.c &&
atomic_read(&vcpu->arch.sie_block->cpuflags) &
CPUSTAT_ECALL_PEND;
}
static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
{
struct sca_block *sca = vcpu->kvm->arch.sca;
uint8_t *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
uint8_t new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
uint8_t old_val = *sigp_ctrl & ~SIGP_CTRL_C;
int expect, rc;
struct bsca_block *sca = vcpu->kvm->arch.sca;
union bsca_sigp_ctrl *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
new_val.scn = src_id;
new_val.c = 1;
old_val.c = 0;
expect = old_val.value;
rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
if (rc != expect) {
/* another external call is pending */
return -EBUSY;
}
@ -65,12 +72,12 @@ static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
{
struct sca_block *sca = vcpu->kvm->arch.sca;
struct bsca_block *sca = vcpu->kvm->arch.sca;
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
uint8_t *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
union bsca_sigp_ctrl *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
*sigp_ctrl = 0;
sigp_ctrl->value = 0;
}
int psw_extint_disabled(struct kvm_vcpu *vcpu)

14
arch/s390/kvm/kvm-s390.c
View File

@ -1100,14 +1100,15 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
rc = -ENOMEM;
kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
kvm->arch.sca = (struct bsca_block *) get_zeroed_page(GFP_KERNEL);
if (!kvm->arch.sca)
goto out_err;
spin_lock(&kvm_lock);
sca_offset += 16;
if (sca_offset + sizeof(struct sca_block) > PAGE_SIZE)
if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
sca_offset = 0;
kvm->arch.sca = (struct sca_block *) ((char *) kvm->arch.sca + sca_offset);
kvm->arch.sca = (struct bsca_block *)
((char *) kvm->arch.sca + sca_offset);
spin_unlock(&kvm_lock);
sprintf(debug_name, "kvm-%u", current->pid);
@ -1190,9 +1191,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
kvm_s390_clear_local_irqs(vcpu);
kvm_clear_async_pf_completion_queue(vcpu);
if (!kvm_is_ucontrol(vcpu->kvm)) {
if (!kvm_is_ucontrol(vcpu->kvm))
sca_del_vcpu(vcpu);
}
smp_mb();
if (kvm_is_ucontrol(vcpu->kvm))
@ -1249,7 +1249,7 @@ static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
static void sca_del_vcpu(struct kvm_vcpu *vcpu)
{
struct sca_block *sca = vcpu->kvm->arch.sca;
struct bsca_block *sca = vcpu->kvm->arch.sca;
clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
if (sca->cpu[vcpu->vcpu_id].sda == (__u64) vcpu->arch.sie_block)
@ -1259,7 +1259,7 @@ static void sca_del_vcpu(struct kvm_vcpu *vcpu)
static void sca_add_vcpu(struct kvm_vcpu *vcpu, struct kvm *kvm,
unsigned int id)
{
struct sca_block *sca = kvm->arch.sca;
struct bsca_block *sca = kvm->arch.sca;
if (!sca->cpu[id].sda)
sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;

4
arch/s390/kvm/kvm-s390.h
View File

@ -343,6 +343,8 @@ void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
/* support for Basic/Extended SCA handling */
static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)
{
return &kvm->arch.sca->ipte_control;
struct bsca_block *sca = kvm->arch.sca; /* SCA version doesn't matter */
return &sca->ipte_control;
}
#endif