From: "Collin L. Walling" <walling@xxxxxxxxxxxxxxxxxx>
Allow for the enablement of MEF and the support for the extended
epoch in SIE and VSIE for the extended guest TOD-Clock.
A new interface is used for getting/setting a guest's extended
TOD-Clock that uses a single ioctl invocation, KVM_S390_VM_TOD_EXT.
The old method of getting and setting the guest TOD-Clock is
retained and is used when the old ioctls are called.
Signed-off-by: Collin L. Walling <walling@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Jason J. Herne <jjherne@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
Documentation/virtual/kvm/devices/vm.txt | 14 ++++-
arch/s390/include/asm/kvm_host.h | 6 +-
arch/s390/include/uapi/asm/kvm.h | 6 ++
arch/s390/kvm/kvm-s390.c | 101 +++++++++++++++++++++++++++++++
arch/s390/kvm/kvm-s390.h | 2 +
arch/s390/kvm/vsie.c | 10 +++
arch/s390/tools/gen_facilities.c | 1 +
7 files changed, 138 insertions(+), 2 deletions(-)
diff --git a/Documentation/virtual/kvm/devices/vm.txt b/Documentation/virtual/kvm/devices/vm.txt
index 903fc92..8a86778 100644
--- a/Documentation/virtual/kvm/devices/vm.txt
+++ b/Documentation/virtual/kvm/devices/vm.txt
@@ -176,7 +176,8 @@ Architectures: s390
3.1. ATTRIBUTE: KVM_S390_VM_TOD_HIGH
-Allows user space to set/get the TOD clock extension (u8).
+Allows user space to set/get the TOD clock extension (u8). (superseded by
+KVM_S390_VM_TOD_EXT).
Parameters: address of a buffer in user space to store the data (u8) to
Returns: -EFAULT if the given address is not accessible from kernel space
@@ -190,6 +191,17 @@ the POP (u64).
Parameters: address of a buffer in user space to store the data (u64) to
Returns: -EFAULT if the given address is not accessible from kernel space
+3.3. ATTRIBUTE: KVM_S390_VM_TOD_EXT
+
+Allows user space to set/get bits 0-63 of the TOD clock register as defined in
+the POP (u64), as well as the TOD clock extension (u8) if supported by the
+host.
+
+Parameters: address of a buffer in user space to store the data
+ (kvm_s390_vm_tod_clock) to
+Returns: -EFAULT if the given address is not accessible from kernel space
+ -EINVAL if setting the TOD clock extension to != 0 is not supported
+
4. GROUP: KVM_S390_VM_CRYPTO
Architectures: s390
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index a409d59..51375e7 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -226,7 +226,9 @@ struct kvm_s390_sie_block {
#define ECB3_RI 0x01
__u8 ecb3; /* 0x0063 */
__u32 scaol; /* 0x0064 */
- __u8 reserved68[4]; /* 0x0068 */
+ __u8 reserved68; /* 0x0068 */
+ __u8 epdx; /* 0x0069 */
+ __u8 reserved6a[2]; /* 0x006a */
__u32 todpr; /* 0x006c */
__u8 reserved70[16]; /* 0x0070 */
__u64 mso; /* 0x0080 */
@@ -265,6 +267,7 @@ struct kvm_s390_sie_block {
__u64 cbrlo; /* 0x01b8 */
__u8 reserved1c0[8]; /* 0x01c0 */
#define ECD_HOSTREGMGMT 0x20000000
+#define ECD_MEF 0x08000000
__u32 ecd; /* 0x01c8 */
__u8 reserved1cc[18]; /* 0x01cc */
__u64 pp; /* 0x01de */
@@ -739,6 +742,7 @@ struct kvm_arch{
struct kvm_s390_cpu_model model;
struct kvm_s390_crypto crypto;
struct kvm_s390_vsie vsie;
+ u8 epdx;
u64 epoch;
struct kvm_s390_migration_state *migration_state;
/* subset of available cpu features enabled by user space */
diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index 69d09c3..cd7359e 100644
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -88,6 +88,12 @@ struct kvm_s390_io_adapter_req {
/* kvm attributes for KVM_S390_VM_TOD */
#define KVM_S390_VM_TOD_LOW 0
#define KVM_S390_VM_TOD_HIGH 1
+#define KVM_S390_VM_TOD_EXT 2
+
+struct kvm_s390_vm_tod_clock {
+ __u8 epoch_idx;
+ __u64 tod;
+};
/* kvm attributes for KVM_S390_VM_CPU_MODEL */
/* processor related attributes are r/w */
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 3f2884e..2547787 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -130,6 +130,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ NULL }
};
+struct kvm_s390_tod_clock_ext {
+ __u8 epoch_idx;
+ __u64 tod;
+ __u8 reserved[7];
+} __packed;
+
/* allow nested virtualization in KVM (if enabled by user space) */
static int nested;
module_param(nested, int, S_IRUGO);
@@ -874,6 +880,26 @@ static int kvm_s390_vm_get_migration(struct kvm *kvm,
return 0;
}
+static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_tod_clock gtod;
+
+ if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod)))
+ return -EFAULT;
+
+ if (test_kvm_facility(kvm, 139))
+ kvm_s390_set_tod_clock_ext(kvm, >od);
+ else if (gtod.epoch_idx == 0)
+ kvm_s390_set_tod_clock(kvm, gtod.tod);
+ else
+ return -EINVAL;
+
+ VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
+ gtod.epoch_idx, gtod.tod);
+
+ return 0;
+}
+
static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
u8 gtod_high;
@@ -909,6 +935,9 @@ static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
return -EINVAL;
switch (attr->attr) {
+ case KVM_S390_VM_TOD_EXT:
+ ret = kvm_s390_set_tod_ext(kvm, attr);
+ break;
case KVM_S390_VM_TOD_HIGH:
ret = kvm_s390_set_tod_high(kvm, attr);
break;
@@ -922,6 +951,43 @@ static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
return ret;
}
+static void kvm_s390_get_tod_clock_ext(struct kvm *kvm,
+ struct kvm_s390_vm_tod_clock *gtod)
+{
+ struct kvm_s390_tod_clock_ext htod;
+
+ preempt_disable();
+
+ get_tod_clock_ext((char *)&htod);
+
+ gtod->tod = htod.tod + kvm->arch.epoch;
+ gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
+
+ if (gtod->tod < htod.tod)
+ gtod->epoch_idx += 1;
+
+ preempt_enable();
+}
+
+static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_tod_clock gtod;
+
+ memset(>od, 0, sizeof(gtod));
+
+ if (test_kvm_facility(kvm, 139))
+ kvm_s390_get_tod_clock_ext(kvm, >od);
+ else
+ gtod.tod = kvm_s390_get_tod_clock_fast(kvm);
+
+ if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod)))
+ return -EFAULT;
+
+ VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
+ gtod.epoch_idx, gtod.tod);
+ return 0;
+}
+
static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
u8 gtod_high = 0;
@@ -954,6 +1020,9 @@ static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
return -EINVAL;
switch (attr->attr) {
+ case KVM_S390_VM_TOD_EXT:
+ ret = kvm_s390_get_tod_ext(kvm, attr);
+ break;
case KVM_S390_VM_TOD_HIGH:
ret = kvm_s390_get_tod_high(kvm, attr);
break;
@@ -2365,6 +2434,9 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
vcpu->arch.sie_block->eca |= ECA_VX;
vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
}
+ if (test_kvm_facility(vcpu->kvm, 139))
+ vcpu->arch.sie_block->ecd |= ECD_MEF;
+
vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
| SDNXC;
vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
@@ -2851,6 +2923,35 @@ static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
return 0;
}
+void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
+ const struct kvm_s390_vm_tod_clock *gtod)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_s390_tod_clock_ext htod;
+ int i;
+
+ mutex_lock(&kvm->lock);
+ preempt_disable();
+
+ get_tod_clock_ext((char *)&htod);
+
+ kvm->arch.epoch = gtod->tod - htod.tod;
+ kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;
+
+ if (kvm->arch.epoch > gtod->tod)
+ kvm->arch.epdx -= 1;
+
+ kvm_s390_vcpu_block_all(kvm);
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ vcpu->arch.sie_block->epoch = kvm->arch.epoch;
+ vcpu->arch.sie_block->epdx = kvm->arch.epdx;
+ }
+
+ kvm_s390_vcpu_unblock_all(kvm);
+ preempt_enable();
+ mutex_unlock(&kvm->lock);
+}
+
void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
{
struct kvm_vcpu *vcpu;
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 6fedc8b..9f8fdd7 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -272,6 +272,8 @@ int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
int handle_sthyi(struct kvm_vcpu *vcpu);
/* implemented in kvm-s390.c */
+void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
+ const struct kvm_s390_vm_tod_clock *gtod);
void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod);
long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable);
int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 715c19c..681d06e 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -349,6 +349,9 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
scb_s->eca |= scb_o->eca & ECA_IB;
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI))
scb_s->eca |= scb_o->eca & ECA_CEI;
+ /* Epoch Extension */
+ if (test_kvm_facility(vcpu->kvm, 139))
+ scb_s->ecd |= scb_o->ecd & ECD_MEF;
prepare_ibc(vcpu, vsie_page);
rc = shadow_crycb(vcpu, vsie_page);
@@ -919,6 +922,13 @@ static void register_shadow_scb(struct kvm_vcpu *vcpu,
*/
preempt_disable();
scb_s->epoch += vcpu->kvm->arch.epoch;
+
+ if (test_kvm_facility(vcpu->kvm, 139)) {
+ scb_s->epdx += vcpu->kvm->arch.epdx;
+ if (scb_s->epoch < vcpu->kvm->arch.epoch)
+ scb_s->epdx += 1;
+ }
+
preempt_enable();
}
diff --git a/arch/s390/tools/gen_facilities.c b/arch/s390/tools/gen_facilities.c
index 181db5b..601bfcf 100644
--- a/arch/s390/tools/gen_facilities.c
+++ b/arch/s390/tools/gen_facilities.c
@@ -81,6 +81,7 @@ static struct facility_def facility_defs[] = {
130, /* instruction-execution-protection */
131, /* enhanced-SOP 2 and side-effect */
138, /* configuration z/architecture mode (czam) */
+ 139, /* multiple epoch facility */
146, /* msa extension 8 */
-1 /* END */
}
--
2.7.4
