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-rw-r--r--arch/s390/kvm/priv.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
new file mode 100644
index 00000000000..d0263895992
--- /dev/null
+++ b/arch/s390/kvm/priv.c
@@ -0,0 +1,383 @@
+/*
+ * priv.c - handling privileged instructions
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * 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/gfp.h>
+#include <linux/errno.h>
+#include <asm/current.h>
+#include <asm/debug.h>
+#include <asm/ebcdic.h>
+#include <asm/sysinfo.h>
+#include "gaccess.h"
+#include "kvm-s390.h"
+
+static int handle_set_prefix(struct kvm_vcpu *vcpu)
+{
+ int base2 = vcpu->arch.sie_block->ipb >> 28;
+ int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
+ u64 operand2;
+ u32 address = 0;
+ u8 tmp;
+
+ vcpu->stat.instruction_spx++;
+
+ operand2 = disp2;
+ if (base2)
+ operand2 += vcpu->arch.guest_gprs[base2];
+
+ /* must be word boundary */
+ if (operand2 & 3) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ /* get the value */
+ if (get_guest_u32(vcpu, operand2, &address)) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out;
+ }
+
+ address = address & 0x7fffe000u;
+
+ /* make sure that the new value is valid memory */
+ if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
+ (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out;
+ }
+
+ vcpu->arch.sie_block->prefix = address;
+ vcpu->arch.sie_block->ihcpu = 0xffff;
+
+ VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
+out:
+ return 0;
+}
+
+static int handle_store_prefix(struct kvm_vcpu *vcpu)
+{
+ int base2 = vcpu->arch.sie_block->ipb >> 28;
+ int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
+ u64 operand2;
+ u32 address;
+
+ vcpu->stat.instruction_stpx++;
+ operand2 = disp2;
+ if (base2)
+ operand2 += vcpu->arch.guest_gprs[base2];
+
+ /* must be word boundary */
+ if (operand2 & 3) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ address = vcpu->arch.sie_block->prefix;
+ address = address & 0x7fffe000u;
+
+ /* get the value */
+ if (put_guest_u32(vcpu, operand2, address)) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out;
+ }
+
+ VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
+out:
+ return 0;
+}
+
+static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
+{
+ int base2 = vcpu->arch.sie_block->ipb >> 28;
+ int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
+ u64 useraddr;
+ int rc;
+
+ vcpu->stat.instruction_stap++;
+ useraddr = disp2;
+ if (base2)
+ useraddr += vcpu->arch.guest_gprs[base2];
+
+ if (useraddr & 1) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id);
+ if (rc == -EFAULT) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out;
+ }
+
+ VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
+out:
+ return 0;
+}
+
+static int handle_skey(struct kvm_vcpu *vcpu)
+{
+ vcpu->stat.instruction_storage_key++;
+ vcpu->arch.sie_block->gpsw.addr -= 4;
+ VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
+ return 0;
+}
+
+static int handle_stsch(struct kvm_vcpu *vcpu)
+{
+ vcpu->stat.instruction_stsch++;
+ VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3");
+ /* condition code 3 */
+ vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
+ vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
+ return 0;
+}
+
+static int handle_chsc(struct kvm_vcpu *vcpu)
+{
+ vcpu->stat.instruction_chsc++;
+ VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3");
+ /* condition code 3 */
+ vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
+ vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
+ return 0;
+}
+
+static int handle_stfl(struct kvm_vcpu *vcpu)
+{
+ unsigned int facility_list;
+ int rc;
+
+ vcpu->stat.instruction_stfl++;
+ /* only pass the facility bits, which we can handle */
+ facility_list = S390_lowcore.stfl_fac_list & 0xff00fff3;
+
+ rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
+ &facility_list, sizeof(facility_list));
+ if (rc == -EFAULT)
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ else
+ VCPU_EVENT(vcpu, 5, "store facility list value %x",
+ facility_list);
+ return 0;
+}
+
+static int handle_stidp(struct kvm_vcpu *vcpu)
+{
+ int base2 = vcpu->arch.sie_block->ipb >> 28;
+ int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
+ u64 operand2;
+ int rc;
+
+ vcpu->stat.instruction_stidp++;
+ operand2 = disp2;
+ if (base2)
+ operand2 += vcpu->arch.guest_gprs[base2];
+
+ if (operand2 & 7) {
+ kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ goto out;
+ }
+
+ rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
+ if (rc == -EFAULT) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out;
+ }
+
+ VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
+out:
+ return 0;
+}
+
+static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
+{
+ struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+ int cpus = 0;
+ int n;
+
+ spin_lock(&fi->lock);
+ for (n = 0; n < KVM_MAX_VCPUS; n++)
+ if (fi->local_int[n])
+ cpus++;
+ spin_unlock(&fi->lock);
+
+ /* deal with other level 3 hypervisors */
+ if (stsi(mem, 3, 2, 2) == -ENOSYS)
+ mem->count = 0;
+ if (mem->count < 8)
+ mem->count++;
+ for (n = mem->count - 1; n > 0 ; n--)
+ memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
+
+ mem->vm[0].cpus_total = cpus;
+ mem->vm[0].cpus_configured = cpus;
+ mem->vm[0].cpus_standby = 0;
+ mem->vm[0].cpus_reserved = 0;
+ mem->vm[0].caf = 1000;
+ memcpy(mem->vm[0].name, "KVMguest", 8);
+ ASCEBC(mem->vm[0].name, 8);
+ memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
+ ASCEBC(mem->vm[0].cpi, 16);
+}
+
+static int handle_stsi(struct kvm_vcpu *vcpu)
+{
+ int fc = (vcpu->arch.guest_gprs[0] & 0xf0000000) >> 28;
+ int sel1 = vcpu->arch.guest_gprs[0] & 0xff;
+ int sel2 = vcpu->arch.guest_gprs[1] & 0xffff;
+ int base2 = vcpu->arch.sie_block->ipb >> 28;
+ int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
+ u64 operand2;
+ unsigned long mem;
+
+ vcpu->stat.instruction_stsi++;
+ VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
+
+ operand2 = disp2;
+ if (base2)
+ operand2 += vcpu->arch.guest_gprs[base2];
+
+ if (operand2 & 0xfff && fc > 0)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+
+ switch (fc) {
+ case 0:
+ vcpu->arch.guest_gprs[0] = 3 << 28;
+ vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
+ return 0;
+ case 1: /* same handling for 1 and 2 */
+ case 2:
+ mem = get_zeroed_page(GFP_KERNEL);
+ if (!mem)
+ goto out_fail;
+ if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS)
+ goto out_mem;
+ break;
+ case 3:
+ if (sel1 != 2 || sel2 != 2)
+ goto out_fail;
+ mem = get_zeroed_page(GFP_KERNEL);
+ if (!mem)
+ goto out_fail;
+ handle_stsi_3_2_2(vcpu, (void *) mem);
+ break;
+ default:
+ goto out_fail;
+ }
+
+ if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ goto out_mem;
+ }
+ free_page(mem);
+ vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
+ vcpu->arch.guest_gprs[0] = 0;
+ return 0;
+out_mem:
+ free_page(mem);
+out_fail:
+ /* condition code 3 */
+ vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
+ return 0;
+}
+
+static intercept_handler_t priv_handlers[256] = {
+ [0x02] = handle_stidp,
+ [0x10] = handle_set_prefix,
+ [0x11] = handle_store_prefix,
+ [0x12] = handle_store_cpu_address,
+ [0x29] = handle_skey,
+ [0x2a] = handle_skey,
+ [0x2b] = handle_skey,
+ [0x34] = handle_stsch,
+ [0x5f] = handle_chsc,
+ [0x7d] = handle_stsi,
+ [0xb1] = handle_stfl,
+};
+
+int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
+{
+ intercept_handler_t handler;
+
+ /*
+ * a lot of B2 instructions are priviledged. We first check for
+ * the privileged ones, that we can handle in the kernel. If the
+ * kernel can handle this instruction, we check for the problem
+ * state bit and (a) handle the instruction or (b) send a code 2
+ * program check.
+ * Anything else goes to userspace.*/
+ handler = priv_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
+ if (handler) {
+ if (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)
+{
+ int base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
+ int disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
+ int base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
+ int disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
+ u64 address1 = disp1 + base1 ? vcpu->arch.guest_gprs[base1] : 0;
+ u64 address2 = disp2 + base2 ? vcpu->arch.guest_gprs[base2] : 0;
+ struct vm_area_struct *vma;
+ unsigned long user_address;
+
+ vcpu->stat.instruction_tprot++;
+
+ /* we only handle the Linux memory detection case:
+ * access key == 0
+ * guest DAT == off
+ * everything else goes to userspace. */
+ if (address2 & 0xf0)
+ return -EOPNOTSUPP;
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
+ return -EOPNOTSUPP;
+
+
+ /* we must resolve the address without holding the mmap semaphore.
+ * This is ok since the userspace hypervisor is not supposed to change
+ * the mapping while the guest queries the memory. Otherwise the guest
+ * might crash or get wrong info anyway. */
+ user_address = (unsigned long) __guestaddr_to_user(vcpu, address1);
+
+ down_read(&current->mm->mmap_sem);
+ vma = find_vma(current->mm, user_address);
+ if (!vma) {
+ up_read(&current->mm->mmap_sem);
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ }
+
+ vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
+ if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
+ vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
+ if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
+ vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
+
+ up_read(&current->mm->mmap_sem);
+ return 0;
+}
+
+int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
+{
+ /* For e5xx... instructions we only handle TPROT */
+ if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
+ return handle_tprot(vcpu);
+ return -EOPNOTSUPP;
+}
+