KVM: s390: intercepts for privileged instructions
This patch introduces in-kernel handling of some intercepts for privileged
instructions:
handle_set_prefix() sets the prefix register of the local cpu
handle_store_prefix() stores the content of the prefix register to memory
handle_store_cpu_address() stores the cpu number of the current cpu to memory
handle_skey() just decrements the instruction address and retries
handle_stsch() delivers condition code 3 "operation not supported"
handle_chsc() same here
handle_stfl() stores the facility list which contains the
capabilities of the cpu
handle_stidp() stores cpu type/model/revision and such
handle_stsi() stores information about the system topology
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@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: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Christian Borntraeger
committed by
Avi Kivity
Avi Kivity
parent
ba5c1e9b6c
commit
453423dce2
323
arch/s390/kvm/priv.c
Normal file
323
arch/s390/kvm/priv.c
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@@ -0,0 +1,323 @@
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/*
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* priv.c - handling privileged instructions
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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.h>
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#include <linux/errno.h>
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#include <asm/current.h>
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#include <asm/debug.h>
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#include <asm/ebcdic.h>
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#include <asm/sysinfo.h>
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#include "gaccess.h"
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#include "kvm-s390.h"
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static int handle_set_prefix(struct kvm_vcpu *vcpu)
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{
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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 operand2;
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u32 address = 0;
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u8 tmp;
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vcpu->stat.instruction_spx++;
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operand2 = disp2;
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if (base2)
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operand2 += vcpu->arch.guest_gprs[base2];
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/* must be word boundary */
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if (operand2 & 3) {
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kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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goto out;
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}
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/* get the value */
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if (get_guest_u32(vcpu, operand2, &address)) {
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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goto out;
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}
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address = address & 0x7fffe000u;
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/* make sure that the new value is valid memory */
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if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
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(copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) {
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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goto out;
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}
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vcpu->arch.sie_block->prefix = address;
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vcpu->arch.sie_block->ihcpu = 0xffff;
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VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
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out:
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return 0;
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}
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static int handle_store_prefix(struct kvm_vcpu *vcpu)
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{
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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 operand2;
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u32 address;
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vcpu->stat.instruction_stpx++;
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operand2 = disp2;
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if (base2)
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operand2 += vcpu->arch.guest_gprs[base2];
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/* must be word boundary */
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if (operand2 & 3) {
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kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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goto out;
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}
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address = vcpu->arch.sie_block->prefix;
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address = address & 0x7fffe000u;
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/* get the value */
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if (put_guest_u32(vcpu, operand2, address)) {
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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goto out;
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}
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VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
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out:
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return 0;
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}
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static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
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{
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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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int rc;
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vcpu->stat.instruction_stap++;
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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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if (useraddr & 1) {
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kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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goto out;
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}
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rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id);
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if (rc == -EFAULT) {
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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goto out;
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}
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VCPU_EVENT(vcpu, 5, "storing cpu address to %lx", useraddr);
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out:
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return 0;
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}
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static int handle_skey(struct kvm_vcpu *vcpu)
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{
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vcpu->stat.instruction_storage_key++;
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vcpu->arch.sie_block->gpsw.addr -= 4;
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VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
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return 0;
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}
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static int handle_stsch(struct kvm_vcpu *vcpu)
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{
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vcpu->stat.instruction_stsch++;
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VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3");
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/* condition code 3 */
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vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
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vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
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return 0;
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}
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static int handle_chsc(struct kvm_vcpu *vcpu)
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{
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vcpu->stat.instruction_chsc++;
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VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3");
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/* condition code 3 */
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vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
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vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
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return 0;
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}
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static unsigned int stfl(void)
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{
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asm volatile(
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" .insn s,0xb2b10000,0(0)\n" /* stfl */
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"0:\n"
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EX_TABLE(0b, 0b));
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return S390_lowcore.stfl_fac_list;
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}
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static int handle_stfl(struct kvm_vcpu *vcpu)
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{
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unsigned int facility_list = stfl();
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int rc;
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vcpu->stat.instruction_stfl++;
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facility_list &= ~(1UL<<24); /* no stfle */
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rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
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&facility_list, sizeof(facility_list));
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if (rc == -EFAULT)
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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else
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VCPU_EVENT(vcpu, 5, "store facility list value %x",
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facility_list);
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return 0;
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}
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static int handle_stidp(struct kvm_vcpu *vcpu)
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{
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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 operand2;
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int rc;
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vcpu->stat.instruction_stidp++;
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operand2 = disp2;
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if (base2)
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operand2 += vcpu->arch.guest_gprs[base2];
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if (operand2 & 7) {
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kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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goto out;
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}
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rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
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if (rc == -EFAULT) {
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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goto out;
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}
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VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
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out:
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return 0;
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}
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static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
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{
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struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
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int cpus = 0;
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int n;
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spin_lock_bh(&fi->lock);
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for (n = 0; n < KVM_MAX_VCPUS; n++)
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if (fi->local_int[n])
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cpus++;
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spin_unlock_bh(&fi->lock);
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/* deal with other level 3 hypervisors */
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if (stsi(mem, 3, 2, 2) == -ENOSYS)
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mem->count = 0;
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if (mem->count < 8)
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mem->count++;
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for (n = mem->count - 1; n > 0 ; n--)
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memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
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mem->vm[0].cpus_total = cpus;
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mem->vm[0].cpus_configured = cpus;
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mem->vm[0].cpus_standby = 0;
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mem->vm[0].cpus_reserved = 0;
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mem->vm[0].caf = 1000;
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memcpy(mem->vm[0].name, "KVMguest", 8);
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ASCEBC(mem->vm[0].name, 8);
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memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
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ASCEBC(mem->vm[0].cpi, 16);
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}
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static int handle_stsi(struct kvm_vcpu *vcpu)
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{
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int fc = (vcpu->arch.guest_gprs[0] & 0xf0000000) >> 28;
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int sel1 = vcpu->arch.guest_gprs[0] & 0xff;
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int sel2 = vcpu->arch.guest_gprs[1] & 0xffff;
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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 operand2;
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unsigned long mem;
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vcpu->stat.instruction_stsi++;
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VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
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operand2 = disp2;
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if (base2)
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operand2 += vcpu->arch.guest_gprs[base2];
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if (operand2 & 0xfff && fc > 0)
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return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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switch (fc) {
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case 0:
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vcpu->arch.guest_gprs[0] = 3 << 28;
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vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
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return 0;
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case 1: /* same handling for 1 and 2 */
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case 2:
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mem = get_zeroed_page(GFP_KERNEL);
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if (!mem)
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goto out_fail;
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if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS)
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goto out_mem;
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break;
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case 3:
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if (sel1 != 2 || sel2 != 2)
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goto out_fail;
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mem = get_zeroed_page(GFP_KERNEL);
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if (!mem)
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goto out_fail;
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handle_stsi_3_2_2(vcpu, (void *) mem);
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break;
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default:
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goto out_fail;
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}
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if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
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kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
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goto out_mem;
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}
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free_page(mem);
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vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
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vcpu->arch.guest_gprs[0] = 0;
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return 0;
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out_mem:
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free_page(mem);
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out_fail:
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/* condition code 3 */
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vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
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return 0;
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}
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static intercept_handler_t priv_handlers[256] = {
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[0x02] = handle_stidp,
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[0x10] = handle_set_prefix,
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[0x11] = handle_store_prefix,
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[0x12] = handle_store_cpu_address,
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[0x29] = handle_skey,
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[0x2a] = handle_skey,
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[0x2b] = handle_skey,
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[0x34] = handle_stsch,
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[0x5f] = handle_chsc,
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[0x7d] = handle_stsi,
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[0xb1] = handle_stfl,
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};
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int kvm_s390_handle_priv(struct kvm_vcpu *vcpu)
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{
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intercept_handler_t handler;
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handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
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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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