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-rw-r--r--arch/s390/kvm/intercept.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
new file mode 100644
index 00000000000..02434543eab
--- /dev/null
+++ b/arch/s390/kvm/intercept.c
@@ -0,0 +1,261 @@
+/*
+ * intercept.c - in-kernel handling for sie intercepts
+ *
+ * Copyright IBM Corp. 2008,2009
+ *
+ * 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_host.h>
+#include <linux/errno.h>
+#include <linux/pagemap.h>
+
+#include <asm/kvm_host.h>
+
+#include "kvm-s390.h"
+#include "gaccess.h"
+
+static int handle_lctlg(struct kvm_vcpu *vcpu)
+{
+ int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
+ int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
+ int base2 = vcpu->arch.sie_block->ipb >> 28;
+ int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
+ ((vcpu->arch.sie_block->ipb & 0xff00) << 4);
+ u64 useraddr;
+ int reg, rc;
+
+ vcpu->stat.instruction_lctlg++;
+ if ((vcpu->arch.sie_block->ipb & 0xff) != 0x2f)
+ return -EOPNOTSUPP;
+
+ useraddr = disp2;
+ if (base2)
+ useraddr += vcpu->arch.guest_gprs[base2];
+
+ if (useraddr & 7)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+
+ reg = reg1;
+
+ VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
+ disp2);
+
+ do {
+ rc = get_guest_u64(vcpu, useraddr,
+ &vcpu->arch.sie_block->gcr[reg]);
+ if (rc == -EFAULT) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ break;
+ }
+ useraddr += 8;
+ if (reg == reg3)
+ break;
+ reg = (reg + 1) % 16;
+ } while (1);
+ return 0;
+}
+
+static int handle_lctl(struct kvm_vcpu *vcpu)
+{
+ int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
+ int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
+ int base2 = vcpu->arch.sie_block->ipb >> 28;
+ int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
+ u64 useraddr;
+ u32 val = 0;
+ int reg, rc;
+
+ vcpu->stat.instruction_lctl++;
+
+ useraddr = disp2;
+ if (base2)
+ useraddr += vcpu->arch.guest_gprs[base2];
+
+ if (useraddr & 3)
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+
+ VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2,
+ disp2);
+
+ reg = reg1;
+ do {
+ rc = get_guest_u32(vcpu, useraddr, &val);
+ if (rc == -EFAULT) {
+ kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ break;
+ }
+ vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
+ vcpu->arch.sie_block->gcr[reg] |= val;
+ useraddr += 4;
+ if (reg == reg3)
+ break;
+ reg = (reg + 1) % 16;
+ } while (1);
+ return 0;
+}
+
+static intercept_handler_t instruction_handlers[256] = {
+ [0x83] = kvm_s390_handle_diag,
+ [0xae] = kvm_s390_handle_sigp,
+ [0xb2] = kvm_s390_handle_b2,
+ [0xb7] = handle_lctl,
+ [0xe5] = kvm_s390_handle_e5,
+ [0xeb] = handle_lctlg,
+};
+
+static int handle_noop(struct kvm_vcpu *vcpu)
+{
+ switch (vcpu->arch.sie_block->icptcode) {
+ case 0x0:
+ vcpu->stat.exit_null++;
+ break;
+ case 0x10:
+ vcpu->stat.exit_external_request++;
+ break;
+ case 0x14:
+ vcpu->stat.exit_external_interrupt++;
+ break;
+ default:
+ break; /* nothing */
+ }
+ return 0;
+}
+
+static int handle_stop(struct kvm_vcpu *vcpu)
+{
+ int rc = 0;
+
+ vcpu->stat.exit_stop_request++;
+ spin_lock_bh(&vcpu->arch.local_int.lock);
+ if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
+ vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
+ rc = kvm_s390_vcpu_store_status(vcpu,
+ KVM_S390_STORE_STATUS_NOADDR);
+ if (rc >= 0)
+ rc = -EOPNOTSUPP;
+ }
+
+ if (vcpu->arch.local_int.action_bits & ACTION_RELOADVCPU_ON_STOP) {
+ vcpu->arch.local_int.action_bits &= ~ACTION_RELOADVCPU_ON_STOP;
+ rc = SIE_INTERCEPT_RERUNVCPU;
+ vcpu->run->exit_reason = KVM_EXIT_INTR;
+ }
+
+ if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
+ atomic_set_mask(CPUSTAT_STOPPED,
+ &vcpu->arch.sie_block->cpuflags);
+ vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
+ VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
+ rc = -EOPNOTSUPP;
+ }
+
+ spin_unlock_bh(&vcpu->arch.local_int.lock);
+ return rc;
+}
+
+static int handle_validity(struct kvm_vcpu *vcpu)
+{
+ unsigned long vmaddr;
+ int viwhy = vcpu->arch.sie_block->ipb >> 16;
+ int rc;
+
+ vcpu->stat.exit_validity++;
+ if (viwhy == 0x37) {
+ vmaddr = gmap_fault(vcpu->arch.sie_block->prefix,
+ vcpu->arch.gmap);
+ if (IS_ERR_VALUE(vmaddr)) {
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
+ rc = fault_in_pages_writeable((char __user *) vmaddr,
+ PAGE_SIZE);
+ if (rc) {
+ /* user will receive sigsegv, exit to user */
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
+ vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE,
+ vcpu->arch.gmap);
+ if (IS_ERR_VALUE(vmaddr)) {
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
+ rc = fault_in_pages_writeable((char __user *) vmaddr,
+ PAGE_SIZE);
+ if (rc) {
+ /* user will receive sigsegv, exit to user */
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
+ } else
+ rc = -EOPNOTSUPP;
+
+out:
+ if (rc)
+ VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
+ viwhy);
+ return rc;
+}
+
+static int handle_instruction(struct kvm_vcpu *vcpu)
+{
+ intercept_handler_t handler;
+
+ vcpu->stat.exit_instruction++;
+ handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
+ if (handler)
+ return handler(vcpu);
+ return -EOPNOTSUPP;
+}
+
+static int handle_prog(struct kvm_vcpu *vcpu)
+{
+ vcpu->stat.exit_program_interruption++;
+ return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
+}
+
+static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
+{
+ int rc, rc2;
+
+ vcpu->stat.exit_instr_and_program++;
+ rc = handle_instruction(vcpu);
+ rc2 = handle_prog(vcpu);
+
+ if (rc == -EOPNOTSUPP)
+ vcpu->arch.sie_block->icptcode = 0x04;
+ if (rc)
+ return rc;
+ return rc2;
+}
+
+static const intercept_handler_t intercept_funcs[] = {
+ [0x00 >> 2] = handle_noop,
+ [0x04 >> 2] = handle_instruction,
+ [0x08 >> 2] = handle_prog,
+ [0x0C >> 2] = handle_instruction_and_prog,
+ [0x10 >> 2] = handle_noop,
+ [0x14 >> 2] = handle_noop,
+ [0x1C >> 2] = kvm_s390_handle_wait,
+ [0x20 >> 2] = handle_validity,
+ [0x28 >> 2] = handle_stop,
+};
+
+int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
+{
+ intercept_handler_t func;
+ u8 code = vcpu->arch.sie_block->icptcode;
+
+ if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
+ return -EOPNOTSUPP;
+ func = intercept_funcs[code >> 2];
+ if (func)
+ return func(vcpu);
+ return -EOPNOTSUPP;
+}