2008-03-26 01:47:23 +08:00
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/*
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* intercept.c - in-kernel handling for sie intercepts
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*
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* Copyright IBM Corp. 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Author(s): Carsten Otte <cotte@de.ibm.com>
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* Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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#include <linux/kvm_host.h>
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#include <linux/errno.h>
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#include <linux/pagemap.h>
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#include <asm/kvm_host.h>
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#include "kvm-s390.h"
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KVM: s390: interrupt subsystem, cpu timer, waitpsw
This patch contains the s390 interrupt subsystem (similar to in kernel apic)
including timer interrupts (similar to in-kernel-pit) and enabled wait
(similar to in kernel hlt).
In order to achieve that, this patch also introduces intercept handling
for instruction intercepts, and it implements load control instructions.
This patch introduces an ioctl KVM_S390_INTERRUPT which is valid for both
the vm file descriptors and the vcpu file descriptors. In case this ioctl is
issued against a vm file descriptor, the interrupt is considered floating.
Floating interrupts may be delivered to any virtual cpu in the configuration.
The following interrupts are supported:
SIGP STOP - interprocessor signal that stops a remote cpu
SIGP SET PREFIX - interprocessor signal that sets the prefix register of a
(stopped) remote cpu
INT EMERGENCY - interprocessor interrupt, usually used to signal need_reshed
and for smp_call_function() in the guest.
PROGRAM INT - exception during program execution such as page fault, illegal
instruction and friends
RESTART - interprocessor signal that starts a stopped cpu
INT VIRTIO - floating interrupt for virtio signalisation
INT SERVICE - floating interrupt for signalisations from the system
service processor
struct kvm_s390_interrupt, which is submitted as ioctl parameter when injecting
an interrupt, also carrys parameter data for interrupts along with the interrupt
type. Interrupts on s390 usually have a state that represents the current
operation, or identifies which device has caused the interruption on s390.
kvm_s390_handle_wait() does handle waitpsw in two flavors: in case of a
disabled wait (that is, disabled for interrupts), we exit to userspace. In case
of an enabled wait we set up a timer that equals the cpu clock comparator value
and sleep on a wait queue.
[christian: change virtio interrupt to 0x2603]
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-26 01:47:26 +08:00
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#include "gaccess.h"
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static int handle_lctg(struct kvm_vcpu *vcpu)
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{
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int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
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int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
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int base2 = vcpu->arch.sie_block->ipb >> 28;
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int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
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((vcpu->arch.sie_block->ipb & 0xff00) << 4);
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u64 useraddr;
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int reg, rc;
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vcpu->stat.instruction_lctg++;
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if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f)
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return -ENOTSUPP;
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useraddr = disp2;
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if (base2)
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useraddr += vcpu->arch.guest_gprs[base2];
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reg = reg1;
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VCPU_EVENT(vcpu, 5, "lctg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
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disp2);
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do {
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rc = get_guest_u64(vcpu, useraddr,
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&vcpu->arch.sie_block->gcr[reg]);
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if (rc == -EFAULT) {
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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break;
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}
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useraddr += 8;
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if (reg == reg3)
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break;
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reg = (reg + 1) % 16;
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} while (1);
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return 0;
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}
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static int handle_lctl(struct kvm_vcpu *vcpu)
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{
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int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
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int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
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int base2 = vcpu->arch.sie_block->ipb >> 28;
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int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
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u64 useraddr;
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u32 val = 0;
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int reg, rc;
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vcpu->stat.instruction_lctl++;
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useraddr = disp2;
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if (base2)
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useraddr += vcpu->arch.guest_gprs[base2];
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VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
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disp2);
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reg = reg1;
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do {
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rc = get_guest_u32(vcpu, useraddr, &val);
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if (rc == -EFAULT) {
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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break;
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}
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vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
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vcpu->arch.sie_block->gcr[reg] |= val;
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useraddr += 4;
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if (reg == reg3)
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break;
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reg = (reg + 1) % 16;
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} while (1);
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return 0;
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}
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static intercept_handler_t instruction_handlers[256] = {
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2008-03-26 01:47:34 +08:00
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[0x83] = kvm_s390_handle_diag,
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2008-03-26 01:47:31 +08:00
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[0xae] = kvm_s390_handle_sigp,
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2008-03-26 01:47:29 +08:00
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[0xb2] = kvm_s390_handle_priv,
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KVM: s390: interrupt subsystem, cpu timer, waitpsw
This patch contains the s390 interrupt subsystem (similar to in kernel apic)
including timer interrupts (similar to in-kernel-pit) and enabled wait
(similar to in kernel hlt).
In order to achieve that, this patch also introduces intercept handling
for instruction intercepts, and it implements load control instructions.
This patch introduces an ioctl KVM_S390_INTERRUPT which is valid for both
the vm file descriptors and the vcpu file descriptors. In case this ioctl is
issued against a vm file descriptor, the interrupt is considered floating.
Floating interrupts may be delivered to any virtual cpu in the configuration.
The following interrupts are supported:
SIGP STOP - interprocessor signal that stops a remote cpu
SIGP SET PREFIX - interprocessor signal that sets the prefix register of a
(stopped) remote cpu
INT EMERGENCY - interprocessor interrupt, usually used to signal need_reshed
and for smp_call_function() in the guest.
PROGRAM INT - exception during program execution such as page fault, illegal
instruction and friends
RESTART - interprocessor signal that starts a stopped cpu
INT VIRTIO - floating interrupt for virtio signalisation
INT SERVICE - floating interrupt for signalisations from the system
service processor
struct kvm_s390_interrupt, which is submitted as ioctl parameter when injecting
an interrupt, also carrys parameter data for interrupts along with the interrupt
type. Interrupts on s390 usually have a state that represents the current
operation, or identifies which device has caused the interruption on s390.
kvm_s390_handle_wait() does handle waitpsw in two flavors: in case of a
disabled wait (that is, disabled for interrupts), we exit to userspace. In case
of an enabled wait we set up a timer that equals the cpu clock comparator value
and sleep on a wait queue.
[christian: change virtio interrupt to 0x2603]
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-26 01:47:26 +08:00
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[0xb7] = handle_lctl,
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[0xeb] = handle_lctg,
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};
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2008-03-26 01:47:23 +08:00
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static int handle_noop(struct kvm_vcpu *vcpu)
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{
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switch (vcpu->arch.sie_block->icptcode) {
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case 0x10:
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vcpu->stat.exit_external_request++;
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break;
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case 0x14:
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vcpu->stat.exit_external_interrupt++;
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break;
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default:
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break; /* nothing */
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}
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return 0;
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}
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static int handle_stop(struct kvm_vcpu *vcpu)
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{
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2008-03-26 01:47:31 +08:00
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int rc;
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2008-03-26 01:47:23 +08:00
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vcpu->stat.exit_stop_request++;
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atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
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2008-03-26 01:47:31 +08:00
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spin_lock_bh(&vcpu->arch.local_int.lock);
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if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
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vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
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rc = __kvm_s390_vcpu_store_status(vcpu,
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KVM_S390_STORE_STATUS_NOADDR);
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if (rc >= 0)
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rc = -ENOTSUPP;
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}
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if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
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vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
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VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
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rc = -ENOTSUPP;
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} else
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rc = 0;
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spin_unlock_bh(&vcpu->arch.local_int.lock);
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return rc;
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2008-03-26 01:47:23 +08:00
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}
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static int handle_validity(struct kvm_vcpu *vcpu)
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{
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int viwhy = vcpu->arch.sie_block->ipb >> 16;
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vcpu->stat.exit_validity++;
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if (viwhy == 0x37) {
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fault_in_pages_writeable((char __user *)
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vcpu->kvm->arch.guest_origin +
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vcpu->arch.sie_block->prefix,
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PAGE_SIZE);
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return 0;
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}
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VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
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viwhy);
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return -ENOTSUPP;
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}
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KVM: s390: interrupt subsystem, cpu timer, waitpsw
This patch contains the s390 interrupt subsystem (similar to in kernel apic)
including timer interrupts (similar to in-kernel-pit) and enabled wait
(similar to in kernel hlt).
In order to achieve that, this patch also introduces intercept handling
for instruction intercepts, and it implements load control instructions.
This patch introduces an ioctl KVM_S390_INTERRUPT which is valid for both
the vm file descriptors and the vcpu file descriptors. In case this ioctl is
issued against a vm file descriptor, the interrupt is considered floating.
Floating interrupts may be delivered to any virtual cpu in the configuration.
The following interrupts are supported:
SIGP STOP - interprocessor signal that stops a remote cpu
SIGP SET PREFIX - interprocessor signal that sets the prefix register of a
(stopped) remote cpu
INT EMERGENCY - interprocessor interrupt, usually used to signal need_reshed
and for smp_call_function() in the guest.
PROGRAM INT - exception during program execution such as page fault, illegal
instruction and friends
RESTART - interprocessor signal that starts a stopped cpu
INT VIRTIO - floating interrupt for virtio signalisation
INT SERVICE - floating interrupt for signalisations from the system
service processor
struct kvm_s390_interrupt, which is submitted as ioctl parameter when injecting
an interrupt, also carrys parameter data for interrupts along with the interrupt
type. Interrupts on s390 usually have a state that represents the current
operation, or identifies which device has caused the interruption on s390.
kvm_s390_handle_wait() does handle waitpsw in two flavors: in case of a
disabled wait (that is, disabled for interrupts), we exit to userspace. In case
of an enabled wait we set up a timer that equals the cpu clock comparator value
and sleep on a wait queue.
[christian: change virtio interrupt to 0x2603]
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-26 01:47:26 +08:00
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static int handle_instruction(struct kvm_vcpu *vcpu)
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{
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intercept_handler_t handler;
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vcpu->stat.exit_instruction++;
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handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
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if (handler)
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return handler(vcpu);
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return -ENOTSUPP;
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}
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static int handle_prog(struct kvm_vcpu *vcpu)
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{
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vcpu->stat.exit_program_interruption++;
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return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
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}
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static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
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{
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int rc, rc2;
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vcpu->stat.exit_instr_and_program++;
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rc = handle_instruction(vcpu);
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rc2 = handle_prog(vcpu);
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if (rc == -ENOTSUPP)
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vcpu->arch.sie_block->icptcode = 0x04;
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if (rc)
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return rc;
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return rc2;
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}
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2008-03-26 01:47:23 +08:00
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static const intercept_handler_t intercept_funcs[0x48 >> 2] = {
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[0x00 >> 2] = handle_noop,
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KVM: s390: interrupt subsystem, cpu timer, waitpsw
This patch contains the s390 interrupt subsystem (similar to in kernel apic)
including timer interrupts (similar to in-kernel-pit) and enabled wait
(similar to in kernel hlt).
In order to achieve that, this patch also introduces intercept handling
for instruction intercepts, and it implements load control instructions.
This patch introduces an ioctl KVM_S390_INTERRUPT which is valid for both
the vm file descriptors and the vcpu file descriptors. In case this ioctl is
issued against a vm file descriptor, the interrupt is considered floating.
Floating interrupts may be delivered to any virtual cpu in the configuration.
The following interrupts are supported:
SIGP STOP - interprocessor signal that stops a remote cpu
SIGP SET PREFIX - interprocessor signal that sets the prefix register of a
(stopped) remote cpu
INT EMERGENCY - interprocessor interrupt, usually used to signal need_reshed
and for smp_call_function() in the guest.
PROGRAM INT - exception during program execution such as page fault, illegal
instruction and friends
RESTART - interprocessor signal that starts a stopped cpu
INT VIRTIO - floating interrupt for virtio signalisation
INT SERVICE - floating interrupt for signalisations from the system
service processor
struct kvm_s390_interrupt, which is submitted as ioctl parameter when injecting
an interrupt, also carrys parameter data for interrupts along with the interrupt
type. Interrupts on s390 usually have a state that represents the current
operation, or identifies which device has caused the interruption on s390.
kvm_s390_handle_wait() does handle waitpsw in two flavors: in case of a
disabled wait (that is, disabled for interrupts), we exit to userspace. In case
of an enabled wait we set up a timer that equals the cpu clock comparator value
and sleep on a wait queue.
[christian: change virtio interrupt to 0x2603]
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-26 01:47:26 +08:00
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[0x04 >> 2] = handle_instruction,
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[0x08 >> 2] = handle_prog,
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[0x0C >> 2] = handle_instruction_and_prog,
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2008-03-26 01:47:23 +08:00
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[0x10 >> 2] = handle_noop,
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[0x14 >> 2] = handle_noop,
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KVM: s390: interrupt subsystem, cpu timer, waitpsw
This patch contains the s390 interrupt subsystem (similar to in kernel apic)
including timer interrupts (similar to in-kernel-pit) and enabled wait
(similar to in kernel hlt).
In order to achieve that, this patch also introduces intercept handling
for instruction intercepts, and it implements load control instructions.
This patch introduces an ioctl KVM_S390_INTERRUPT which is valid for both
the vm file descriptors and the vcpu file descriptors. In case this ioctl is
issued against a vm file descriptor, the interrupt is considered floating.
Floating interrupts may be delivered to any virtual cpu in the configuration.
The following interrupts are supported:
SIGP STOP - interprocessor signal that stops a remote cpu
SIGP SET PREFIX - interprocessor signal that sets the prefix register of a
(stopped) remote cpu
INT EMERGENCY - interprocessor interrupt, usually used to signal need_reshed
and for smp_call_function() in the guest.
PROGRAM INT - exception during program execution such as page fault, illegal
instruction and friends
RESTART - interprocessor signal that starts a stopped cpu
INT VIRTIO - floating interrupt for virtio signalisation
INT SERVICE - floating interrupt for signalisations from the system
service processor
struct kvm_s390_interrupt, which is submitted as ioctl parameter when injecting
an interrupt, also carrys parameter data for interrupts along with the interrupt
type. Interrupts on s390 usually have a state that represents the current
operation, or identifies which device has caused the interruption on s390.
kvm_s390_handle_wait() does handle waitpsw in two flavors: in case of a
disabled wait (that is, disabled for interrupts), we exit to userspace. In case
of an enabled wait we set up a timer that equals the cpu clock comparator value
and sleep on a wait queue.
[christian: change virtio interrupt to 0x2603]
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-26 01:47:26 +08:00
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[0x1C >> 2] = kvm_s390_handle_wait,
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2008-03-26 01:47:23 +08:00
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[0x20 >> 2] = handle_validity,
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[0x28 >> 2] = handle_stop,
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};
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int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
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{
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intercept_handler_t func;
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u8 code = vcpu->arch.sie_block->icptcode;
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if (code & 3 || code > 0x48)
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return -ENOTSUPP;
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func = intercept_funcs[code >> 2];
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if (func)
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return func(vcpu);
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return -ENOTSUPP;
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}
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