forked from luck/tmp_suning_uos_patched
8733ac36fc
Lets replace the old open coded version of diag 0x44 (which relied on compat_sched_yield) with kvm_vcpu_on_spin. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*
|
|
* diag.c - handling diagnose instructions
|
|
*
|
|
* Copyright IBM Corp. 2008,2011
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License (version 2 only)
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* Author(s): Carsten Otte <cotte@de.ibm.com>
|
|
* Christian Borntraeger <borntraeger@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/kvm.h>
|
|
#include <linux/kvm_host.h>
|
|
#include "kvm-s390.h"
|
|
|
|
static int diag_release_pages(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long start, end;
|
|
unsigned long prefix = vcpu->arch.sie_block->prefix;
|
|
|
|
start = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
|
|
end = vcpu->run->s.regs.gprs[vcpu->arch.sie_block->ipa & 0xf] + 4096;
|
|
|
|
if (start & ~PAGE_MASK || end & ~PAGE_MASK || start > end
|
|
|| start < 2 * PAGE_SIZE)
|
|
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
|
|
|
|
VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end);
|
|
vcpu->stat.diagnose_10++;
|
|
|
|
/* we checked for start > end above */
|
|
if (end < prefix || start >= prefix + 2 * PAGE_SIZE) {
|
|
gmap_discard(start, end, vcpu->arch.gmap);
|
|
} else {
|
|
if (start < prefix)
|
|
gmap_discard(start, prefix, vcpu->arch.gmap);
|
|
if (end >= prefix)
|
|
gmap_discard(prefix + 2 * PAGE_SIZE,
|
|
end, vcpu->arch.gmap);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __diag_time_slice_end(struct kvm_vcpu *vcpu)
|
|
{
|
|
VCPU_EVENT(vcpu, 5, "%s", "diag time slice end");
|
|
vcpu->stat.diagnose_44++;
|
|
kvm_vcpu_on_spin(vcpu);
|
|
return 0;
|
|
}
|
|
|
|
static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct kvm_vcpu *tcpu;
|
|
int tid;
|
|
int i;
|
|
|
|
tid = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
|
|
vcpu->stat.diagnose_9c++;
|
|
VCPU_EVENT(vcpu, 5, "diag time slice end directed to %d", tid);
|
|
|
|
if (tid == vcpu->vcpu_id)
|
|
return 0;
|
|
|
|
kvm_for_each_vcpu(i, tcpu, kvm)
|
|
if (tcpu->vcpu_id == tid) {
|
|
kvm_vcpu_yield_to(tcpu);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned int reg = vcpu->arch.sie_block->ipa & 0xf;
|
|
unsigned long subcode = vcpu->run->s.regs.gprs[reg] & 0xffff;
|
|
|
|
VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode);
|
|
switch (subcode) {
|
|
case 3:
|
|
vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;
|
|
break;
|
|
case 4:
|
|
vcpu->run->s390_reset_flags = 0;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
|
|
vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM;
|
|
vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL;
|
|
vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT;
|
|
vcpu->run->exit_reason = KVM_EXIT_S390_RESET;
|
|
VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx",
|
|
vcpu->run->s390_reset_flags);
|
|
return -EREMOTE;
|
|
}
|
|
|
|
int kvm_s390_handle_diag(struct kvm_vcpu *vcpu)
|
|
{
|
|
int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16;
|
|
|
|
switch (code) {
|
|
case 0x10:
|
|
return diag_release_pages(vcpu);
|
|
case 0x44:
|
|
return __diag_time_slice_end(vcpu);
|
|
case 0x9c:
|
|
return __diag_time_slice_end_directed(vcpu);
|
|
case 0x308:
|
|
return __diag_ipl_functions(vcpu);
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|