Add support for injecting machine checks (only repressible
conditions for now).
This is a bit more involved than I/O interrupts, for these reasons:
- Machine checks come in both floating and cpu varieties.
- We don't have a bit for machine checks enabling, but have to use
a roundabout approach with trapping PSW changing instructions and
watching for opened machine checks.
Reviewed-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
---
Documentation/virtual/kvm/api.txt | 4 ++
arch/s390/include/asm/kvm_host.h | 8 +++
arch/s390/kvm/intercept.c | 2 +
arch/s390/kvm/interrupt.c | 112 +++++++++++++++++++++++++++++++
arch/s390/kvm/kvm-s390.h | 3 +
arch/s390/kvm/priv.c | 135 ++++++++++++++++++++++++++++++++++++++
arch/s390/kvm/trace-s390.h | 6 +-
include/uapi/linux/kvm.h | 1 +
8 files changed, 268 insertions(+), 3 deletions(-)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 83bd92b..8a0de30 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2073,6 +2073,10 @@ KVM_S390_INT_IO(ai,cssid,ssid,schid) (vm) - compound value to indicate an
I/O interrupt (ai - adapter interrupt; cssid,ssid,schid - subchannel);
I/O interruption parameters in parm (subchannel) and parm64 (intparm,
interruption subclass)
+KVM_S390_MCHK (vm, vcpu) - machine check interrupt; cr 14 bits in parm,
+ machine check interrupt code in parm64 (note that
+ machine checks needing further payload are not
+ supported by this ioctl)
Note that the vcpu ioctl is asynchronous to vcpu execution.
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index a8e35c4..29363d1 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -75,8 +75,10 @@ struct kvm_s390_sie_block {
__u8 reserved40[4]; /* 0x0040 */
#define LCTL_CR0 0x8000
#define LCTL_CR6 0x0200
+#define LCTL_CR14 0x0002
__u16 lctl; /* 0x0044 */
__s16 icpua; /* 0x0046 */
+#define ICTL_LPSW 0x00400000
__u32 ictl; /* 0x0048 */
__u32 eca; /* 0x004c */
__u8 icptcode; /* 0x0050 */
@@ -187,6 +189,11 @@ struct kvm_s390_emerg_info {
__u16 code;
};
+struct kvm_s390_mchk_info {
+ __u64 cr14;
+ __u64 mcic;
+};
+
struct kvm_s390_interrupt_info {
struct list_head list;
u64 type;
@@ -197,6 +204,7 @@ struct kvm_s390_interrupt_info {
struct kvm_s390_emerg_info emerg;
struct kvm_s390_extcall_info extcall;
struct kvm_s390_prefix_info prefix;
+ struct kvm_s390_mchk_info mchk;
};
};
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index df6c0ad..950c13e 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -97,10 +97,12 @@ static int handle_lctl(struct kvm_vcpu *vcpu)
static const intercept_handler_t instruction_handlers[256] = {
[0x01] = kvm_s390_handle_01,
+ [0x82] = kvm_s390_handle_lpsw,
[0x83] = kvm_s390_handle_diag,
[0xae] = kvm_s390_handle_sigp,
[0xb2] = kvm_s390_handle_b2,
[0xb7] = handle_lctl,
+ [0xb9] = kvm_s390_handle_b9,
[0xe5] = kvm_s390_handle_e5,
[0xeb] = handle_lctlg,
};
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 52cdf20..b3b4748 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -41,6 +41,11 @@ static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
}
+static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
+{
+ return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
+}
+
static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
{
if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
@@ -82,6 +87,12 @@ static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
case KVM_S390_SIGP_SET_PREFIX:
case KVM_S390_RESTART:
return 1;
+ case KVM_S390_MCHK:
+ if (psw_mchk_disabled(vcpu))
+ return 0;
+ if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
+ return 1;
+ return 0;
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
if (psw_ioint_disabled(vcpu))
return 0;
@@ -116,6 +127,7 @@ static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
&vcpu->arch.sie_block->cpuflags);
vcpu->arch.sie_block->lctl = 0x0000;
+ vcpu->arch.sie_block->ictl &= ~ICTL_LPSW;
}
static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
@@ -139,6 +151,12 @@ static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
case KVM_S390_SIGP_STOP:
__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
break;
+ case KVM_S390_MCHK:
+ if (psw_mchk_disabled(vcpu))
+ vcpu->arch.sie_block->ictl |= ICTL_LPSW;
+ else
+ vcpu->arch.sie_block->lctl |= LCTL_CR14;
+ break;
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
if (psw_ioint_disabled(vcpu))
__set_cpuflag(vcpu, CPUSTAT_IO_INT);
@@ -326,6 +344,32 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
exception = 1;
break;
+ case KVM_S390_MCHK:
+ VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
+ inti->mchk.mcic);
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
+ inti->mchk.cr14,
+ inti->mchk.mcic);
+ rc = kvm_s390_vcpu_store_status(vcpu,
+ KVM_S390_STORE_STATUS_PREFIXED);
+ if (rc == -EFAULT)
+ exception = 1;
+
+ rc = put_guest_u64(vcpu, __LC_MCCK_CODE, inti->mchk.mcic);
+ if (rc == -EFAULT)
+ exception = 1;
+
+ rc = copy_to_guest(vcpu, __LC_MCK_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ if (rc == -EFAULT)
+ exception = 1;
+
+ rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
+ __LC_MCK_NEW_PSW, sizeof(psw_t));
+ if (rc == -EFAULT)
+ exception = 1;
+ break;
+
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
{
__u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
@@ -588,6 +632,61 @@ void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
}
}
+void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
+ struct kvm_s390_interrupt_info *n, *inti = NULL;
+ int deliver;
+
+ __reset_intercept_indicators(vcpu);
+ if (atomic_read(&li->active)) {
+ do {
+ deliver = 0;
+ spin_lock_bh(&li->lock);
+ list_for_each_entry_safe(inti, n, &li->list, list) {
+ if ((inti->type == KVM_S390_MCHK) &&
+ __interrupt_is_deliverable(vcpu, inti)) {
+ list_del(&inti->list);
+ deliver = 1;
+ break;
+ }
+ __set_intercept_indicator(vcpu, inti);
+ }
+ if (list_empty(&li->list))
+ atomic_set(&li->active, 0);
+ spin_unlock_bh(&li->lock);
+ if (deliver) {
+ __do_deliver_interrupt(vcpu, inti);
+ kfree(inti);
+ }
+ } while (deliver);
+ }
+
+ if (atomic_read(&fi->active)) {
+ do {
+ deliver = 0;
+ spin_lock(&fi->lock);
+ list_for_each_entry_safe(inti, n, &fi->list, list) {
+ if ((inti->type == KVM_S390_MCHK) &&
+ __interrupt_is_deliverable(vcpu, inti)) {
+ list_del(&inti->list);
+ deliver = 1;
+ break;
+ }
+ __set_intercept_indicator(vcpu, inti);
+ }
+ if (list_empty(&fi->list))
+ atomic_set(&fi->active, 0);
+ spin_unlock(&fi->lock);
+ if (deliver) {
+ __do_deliver_interrupt(vcpu, inti);
+ kfree(inti);
+ }
+ } while (deliver);
+ }
+}
+
int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
@@ -641,6 +740,13 @@ int kvm_s390_inject_vm(struct kvm *kvm,
case KVM_S390_INT_EMERGENCY:
kfree(inti);
return -EINVAL;
+ case KVM_S390_MCHK:
+ VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
+ s390int->parm64);
+ inti->type = s390int->type;
+ inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
+ inti->mchk.mcic = s390int->parm64;
+ break;
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
if (s390int->type & IOINT_AI_MASK)
VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
@@ -749,6 +855,12 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
inti->type = s390int->type;
inti->emerg.code = s390int->parm;
break;
+ case KVM_S390_MCHK:
+ VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
+ s390int->parm64);
+ inti->type = s390int->type;
+ inti->mchk.mcic = s390int->parm64;
+ break;
case KVM_S390_INT_VIRTIO:
case KVM_S390_INT_SERVICE:
case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index dccc024..1f7cc6c 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -106,6 +106,7 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
void kvm_s390_tasklet(unsigned long parm);
void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
+void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu);
int kvm_s390_inject_vm(struct kvm *kvm,
struct kvm_s390_interrupt *s390int);
int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
@@ -117,6 +118,8 @@ int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action);
int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
+int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
+int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
/* implemented in sigp.c */
int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index d715842..d3cbcd3 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -18,6 +18,8 @@
#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <asm/sysinfo.h>
+#include <asm/ptrace.h>
+#include <asm/compat.h>
#include "gaccess.h"
#include "kvm-s390.h"
#include "trace.h"
@@ -166,6 +168,99 @@ static int handle_stfl(struct kvm_vcpu *vcpu)
return 0;
}
+static void handle_new_psw(struct kvm_vcpu *vcpu)
+{
+ /* Check whether the new psw is enabled for machine checks. */
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
+ kvm_s390_deliver_pending_machine_checks(vcpu);
+}
+
+#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
+#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
+#define PSW_ADDR_24 0x00000000000fffffUL
+#define PSW_ADDR_31 0x000000007fffffffUL
+
+int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
+{
+ u64 addr;
+ psw_compat_t new_psw;
+
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
+ return kvm_s390_inject_program_int(vcpu,
+ PGM_PRIVILEGED_OPERATION);
+
+ addr = kvm_s390_get_base_disp_s(vcpu);
+
+ if (addr & 7) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out;
+ }
+
+ if (!(new_psw.mask & PSW32_MASK_BASE)) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ vcpu->arch.sie_block->gpsw.mask =
+ (new_psw.mask & ~PSW32_MASK_BASE) << 32;
+ vcpu->arch.sie_block->gpsw.addr = new_psw.addr;
+
+ if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_UNASSIGNED) ||
+ (!(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) &&
+ (vcpu->arch.sie_block->gpsw.addr & ~PSW_ADDR_24)) ||
+ ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) ==
+ PSW_MASK_EA)) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ handle_new_psw(vcpu);
+out:
+ return 0;
+}
+
+static int handle_lpswe(struct kvm_vcpu *vcpu)
+{
+ u64 addr;
+ psw_t new_psw;
+
+ addr = kvm_s390_get_base_disp_s(vcpu);
+
+ if (addr & 7) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out;
+ }
+
+ vcpu->arch.sie_block->gpsw.mask = new_psw.mask;
+ vcpu->arch.sie_block->gpsw.addr = new_psw.addr;
+
+ if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_UNASSIGNED) ||
+ (((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) ==
+ PSW_MASK_BA) &&
+ (vcpu->arch.sie_block->gpsw.addr & ~PSW_ADDR_31)) ||
+ (!(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) &&
+ (vcpu->arch.sie_block->gpsw.addr & ~PSW_ADDR_24)) ||
+ ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_ADDR_MODE) ==
+ PSW_MASK_EA)) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ handle_new_psw(vcpu);
+out:
+ return 0;
+}
+
static int handle_stidp(struct kvm_vcpu *vcpu)
{
u64 operand2;
@@ -292,6 +387,7 @@ static const intercept_handler_t priv_handlers[256] = {
[0x5f] = handle_chsc,
[0x7d] = handle_stsi,
[0xb1] = handle_stfl,
+ [0xb2] = handle_lpswe,
};
int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
@@ -316,6 +412,45 @@ int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
return -EOPNOTSUPP;
}
+static int handle_epsw(struct kvm_vcpu *vcpu)
+{
+ int reg1, reg2;
+
+ reg1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 24;
+ reg2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
+
+ /* This basically extracts the mask half of the psw. */
+ vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000;
+ vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
+ if (reg2) {
+ vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000;
+ vcpu->run->s.regs.gprs[reg2] |=
+ vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffff;
+ }
+ return 0;
+}
+
+static const intercept_handler_t b9_handlers[256] = {
+ [0x8d] = handle_epsw,
+};
+
+int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
+{
+ intercept_handler_t handler;
+
+ /* This is handled just as for the B2 instructions. */
+ handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
+ if (handler) {
+ if ((handler != handle_epsw) &&
+ (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE))
+ return kvm_s390_inject_program_int(vcpu,
+ PGM_PRIVILEGED_OPERATION);
+ else
+ return handler(vcpu);
+ }
+ return -EOPNOTSUPP;
+}
+
static int handle_tprot(struct kvm_vcpu *vcpu)
{
u64 address1, address2;
diff --git a/arch/s390/kvm/trace-s390.h b/arch/s390/kvm/trace-s390.h
index 90fdf85..95fbc1a 100644
--- a/arch/s390/kvm/trace-s390.h
+++ b/arch/s390/kvm/trace-s390.h
@@ -141,13 +141,13 @@ TRACE_EVENT(kvm_s390_inject_vcpu,
* Trace point for the actual delivery of interrupts.
*/
TRACE_EVENT(kvm_s390_deliver_interrupt,
- TP_PROTO(unsigned int id, __u64 type, __u32 data0, __u64 data1),
+ TP_PROTO(unsigned int id, __u64 type, __u64 data0, __u64 data1),
TP_ARGS(id, type, data0, data1),
TP_STRUCT__entry(
__field(int, id)
__field(__u32, inttype)
- __field(__u32, data0)
+ __field(__u64, data0)
__field(__u64, data1)
),
@@ -159,7 +159,7 @@ TRACE_EVENT(kvm_s390_deliver_interrupt,
),
TP_printk("deliver interrupt (vcpu %d): type:%x (%s) " \
- "data:%08x %016llx",
+ "data:%08llx %016llx",
__entry->id, __entry->inttype,
__print_symbolic(__entry->inttype, kvm_s390_int_type),
__entry->data0, __entry->data1)
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 54540bd..80bb3b8 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -397,6 +397,7 @@ struct kvm_s390_psw {
#define KVM_S390_PROGRAM_INT 0xfffe0001u
#define KVM_S390_SIGP_SET_PREFIX 0xfffe0002u
#define KVM_S390_RESTART 0xfffe0003u
+#define KVM_S390_MCHK 0xfffe1000u
#define KVM_S390_INT_VIRTIO 0xffff2603u
#define KVM_S390_INT_SERVICE 0xffff2401u
#define KVM_S390_INT_EMERGENCY 0xffff1201u
--
1.7.12.4
--
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