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![Heiko Carstens](/assets/img/avatar_default.png)
The diagnose code to be used is the contents of the base register (if not zero), plus the displacement. The current code ignores the base register contents. So let's fix that... Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: stable@vger.kernel.org Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
160 lines
4.3 KiB
C
160 lines
4.3 KiB
C
/*
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* handling diagnose instructions
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*
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* Copyright IBM Corp. 2008, 2011
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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.h>
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#include <linux/kvm_host.h>
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#include <asm/virtio-ccw.h>
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#include "kvm-s390.h"
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#include "trace.h"
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#include "trace-s390.h"
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static int diag_release_pages(struct kvm_vcpu *vcpu)
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{
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unsigned long start, end;
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unsigned long prefix = vcpu->arch.sie_block->prefix;
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start = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
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end = vcpu->run->s.regs.gprs[vcpu->arch.sie_block->ipa & 0xf] + 4096;
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if (start & ~PAGE_MASK || end & ~PAGE_MASK || start > end
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|| start < 2 * PAGE_SIZE)
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return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end);
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vcpu->stat.diagnose_10++;
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/* we checked for start > end above */
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if (end < prefix || start >= prefix + 2 * PAGE_SIZE) {
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gmap_discard(start, end, vcpu->arch.gmap);
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} else {
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if (start < prefix)
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gmap_discard(start, prefix, vcpu->arch.gmap);
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if (end >= prefix)
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gmap_discard(prefix + 2 * PAGE_SIZE,
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end, vcpu->arch.gmap);
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}
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return 0;
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}
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static int __diag_time_slice_end(struct kvm_vcpu *vcpu)
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{
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VCPU_EVENT(vcpu, 5, "%s", "diag time slice end");
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vcpu->stat.diagnose_44++;
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kvm_vcpu_on_spin(vcpu);
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return 0;
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}
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static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu)
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{
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struct kvm *kvm = vcpu->kvm;
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struct kvm_vcpu *tcpu;
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int tid;
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int i;
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tid = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
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vcpu->stat.diagnose_9c++;
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VCPU_EVENT(vcpu, 5, "diag time slice end directed to %d", tid);
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if (tid == vcpu->vcpu_id)
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return 0;
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kvm_for_each_vcpu(i, tcpu, kvm)
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if (tcpu->vcpu_id == tid) {
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kvm_vcpu_yield_to(tcpu);
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break;
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}
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return 0;
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}
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static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
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{
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unsigned int reg = vcpu->arch.sie_block->ipa & 0xf;
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unsigned long subcode = vcpu->run->s.regs.gprs[reg] & 0xffff;
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VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode);
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switch (subcode) {
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case 3:
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vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;
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break;
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case 4:
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vcpu->run->s390_reset_flags = 0;
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break;
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default:
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return -EOPNOTSUPP;
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}
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atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
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vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM;
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vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL;
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vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT;
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vcpu->run->exit_reason = KVM_EXIT_S390_RESET;
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VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx",
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vcpu->run->s390_reset_flags);
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trace_kvm_s390_request_resets(vcpu->run->s390_reset_flags);
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return -EREMOTE;
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}
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static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu)
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{
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int ret;
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/* No virtio-ccw notification? Get out quickly. */
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if (!vcpu->kvm->arch.css_support ||
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(vcpu->run->s.regs.gprs[1] != KVM_S390_VIRTIO_CCW_NOTIFY))
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return -EOPNOTSUPP;
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/*
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* The layout is as follows:
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* - gpr 2 contains the subchannel id (passed as addr)
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* - gpr 3 contains the virtqueue index (passed as datamatch)
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* - gpr 4 contains the index on the bus (optionally)
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*/
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ret = kvm_io_bus_write_cookie(vcpu->kvm, KVM_VIRTIO_CCW_NOTIFY_BUS,
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vcpu->run->s.regs.gprs[2],
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8, &vcpu->run->s.regs.gprs[3],
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vcpu->run->s.regs.gprs[4]);
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/*
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* Return cookie in gpr 2, but don't overwrite the register if the
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* diagnose will be handled by userspace.
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*/
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if (ret != -EOPNOTSUPP)
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vcpu->run->s.regs.gprs[2] = ret;
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/* kvm_io_bus_write_cookie returns -EOPNOTSUPP if it found no match. */
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return ret < 0 ? ret : 0;
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}
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int kvm_s390_handle_diag(struct kvm_vcpu *vcpu)
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{
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int code = kvm_s390_get_base_disp_rs(vcpu) & 0xffff;
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if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
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return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
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trace_kvm_s390_handle_diag(vcpu, code);
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switch (code) {
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case 0x10:
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return diag_release_pages(vcpu);
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case 0x44:
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return __diag_time_slice_end(vcpu);
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case 0x9c:
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return __diag_time_slice_end_directed(vcpu);
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case 0x308:
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return __diag_ipl_functions(vcpu);
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case 0x500:
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return __diag_virtio_hypercall(vcpu);
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default:
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return -EOPNOTSUPP;
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}
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}
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