*
* Copyright (c) 2017 Masatake YAMATO <yamato@redhat.com>
* Copyright (c) 2017 Red Hat, Inc.
+ * Copyright (c) 2017-2018 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#ifdef HAVE_LINUX_KVM_H
# include <linux/kvm.h>
# include "print_fields.h"
+# include "arch_kvm.c"
+# include "xmalloc.h"
+# include "mmap_cache.h"
+
+struct vcpu_info {
+ struct vcpu_info *next;
+ int fd;
+ int cpuid;
+ long mmap_addr;
+ unsigned long mmap_len;
+ bool resolved;
+};
+
+static bool dump_kvm_run_structure;
+
+static struct vcpu_info *
+vcpu_find(struct tcb *const tcp, int fd)
+{
+ for (struct vcpu_info *vcpu_info = tcp->vcpu_info_list;
+ vcpu_info;
+ vcpu_info = vcpu_info->next)
+ if (vcpu_info->fd == fd)
+ return vcpu_info;
+
+ return NULL;
+}
+
+static struct vcpu_info *
+vcpu_alloc(struct tcb *const tcp, int fd, int cpuid)
+{
+ struct vcpu_info *vcpu_info = xcalloc(1, sizeof(*vcpu_info));
+
+ vcpu_info->fd = fd;
+ vcpu_info->cpuid = cpuid;
+
+ vcpu_info->next = tcp->vcpu_info_list;
+ tcp->vcpu_info_list = vcpu_info;
+
+ return vcpu_info;
+}
+
+void
+kvm_vcpu_info_free(struct tcb *tcp)
+{
+ struct vcpu_info *head, *next;
+
+ for (head = tcp->vcpu_info_list; head; head = next) {
+ next = head->next;
+ free(head);
+ }
+
+ tcp->vcpu_info_list = NULL;
+}
+
+static void
+vcpu_register(struct tcb *const tcp, int fd, int cpuid)
+{
+ if (fd < 0)
+ return;
+
+ struct vcpu_info *vcpu_info = vcpu_find(tcp, fd);
+
+ if (!vcpu_info)
+ vcpu_info = vcpu_alloc(tcp, fd, cpuid);
+ else if (vcpu_info->cpuid != cpuid)
+ {
+ vcpu_info->cpuid = cpuid;
+ vcpu_info->resolved = false;
+ }
+}
+
+static bool
+is_map_for_file(struct mmap_cache_entry_t *map_info, void *data)
+{
+ /* major version for anon inode may be given in get_anon_bdev()
+ * in linux kernel.
+ *
+ * *p = MKDEV(0, dev & MINORMASK);
+ *-----------------^
+ */
+ return map_info->binary_filename &&
+ map_info->major == 0 &&
+ strcmp(map_info->binary_filename, data) == 0;
+}
+
+static unsigned long
+map_len(struct mmap_cache_entry_t *map_info)
+{
+ return map_info->start_addr < map_info->end_addr
+ ? map_info->end_addr - map_info->start_addr
+ : 0;
+}
+
+#define VCPU_DENTRY_PREFIX "anon_inode:kvm-vcpu:"
+
+static struct vcpu_info*
+vcpu_get_info(struct tcb *const tcp, int fd)
+{
+ struct vcpu_info *vcpu_info = vcpu_find(tcp, fd);
+ struct mmap_cache_entry_t *map_info;
+ const char *cpuid_str;
+
+ enum mmap_cache_rebuild_result mc_stat =
+ mmap_cache_rebuild_if_invalid(tcp, __func__);
+ if (mc_stat == MMAP_CACHE_REBUILD_NOCACHE)
+ return NULL;
+
+ if (vcpu_info && vcpu_info->resolved) {
+ if (mc_stat == MMAP_CACHE_REBUILD_READY)
+ return vcpu_info;
+ else {
+ map_info = mmap_cache_search(tcp, vcpu_info->mmap_addr);
+ if (map_info) {
+ cpuid_str =
+ STR_STRIP_PREFIX(map_info->binary_filename,
+ VCPU_DENTRY_PREFIX);
+ if (cpuid_str != map_info->binary_filename) {
+ int cpuid = string_to_uint(cpuid_str);
+ if (cpuid < 0)
+ return NULL;
+ if (vcpu_info->cpuid == cpuid)
+ return vcpu_info;
+ }
+ }
+
+ /* The vcpu vma may be mremap'ed. */
+ vcpu_info->resolved = false;
+ }
+ }
+
+ /* Slow path: !vcpu_info || !vcpu_info->resolved */
+ char path[PATH_MAX + 1];
+ cpuid_str = path;
+ if (getfdpath(tcp, fd, path, sizeof(path)) >= 0)
+ cpuid_str = STR_STRIP_PREFIX(path, VCPU_DENTRY_PREFIX);
+ if (cpuid_str == path)
+ map_info = NULL;
+ else
+ map_info = mmap_cache_search_custom(tcp, is_map_for_file, path);
+
+ if (map_info) {
+ int cpuid = string_to_uint(cpuid_str);
+ if (cpuid < 0)
+ return NULL;
+ if (!vcpu_info)
+ vcpu_info = vcpu_alloc(tcp, fd, cpuid);
+ else if (vcpu_info->cpuid != cpuid)
+ vcpu_info->cpuid = cpuid;
+ vcpu_info->mmap_addr = map_info->start_addr;
+ vcpu_info->mmap_len = map_len(map_info);
+ vcpu_info->resolved = true;
+ return vcpu_info;
+ }
+
+ return NULL;
+}
static int
kvm_ioctl_create_vcpu(struct tcb *const tcp, const kernel_ulong_t arg)
{
uint32_t cpuid = arg;
- tprintf(", %u", cpuid);
+ if (entering(tcp)) {
+ tprintf(", %u", cpuid);
+ if (dump_kvm_run_structure)
+ return 0;
+ } else if (!syserror(tcp)) {
+ vcpu_register(tcp, tcp->u_rval, cpuid);
+ }
+
return RVAL_IOCTL_DECODED | RVAL_FD;
}
}
# endif /* HAVE_STRUCT_KVM_USERSPACE_MEMORY_REGION */
+# ifdef HAVE_STRUCT_KVM_REGS
+static int
+kvm_ioctl_decode_regs(struct tcb *const tcp, const unsigned int code,
+ const kernel_ulong_t arg)
+{
+ struct kvm_regs regs;
+
+ if (code == KVM_GET_REGS && entering(tcp))
+ return 0;
+
+ tprints(", ");
+ if (!umove_or_printaddr(tcp, arg, ®s))
+ arch_print_kvm_regs(tcp, arg, ®s);
+
+ return RVAL_IOCTL_DECODED;
+}
+# endif /* HAVE_STRUCT_KVM_REGS */
+
+# ifdef HAVE_STRUCT_KVM_CPUID2
+# include "xlat/kvm_cpuid_flags.h"
+static bool
+print_kvm_cpuid_entry(struct tcb *const tcp,
+ void* elem_buf, size_t elem_size, void* data)
+{
+ const struct kvm_cpuid_entry2 *entry = elem_buf;
+ PRINT_FIELD_X("{", *entry, function);
+ PRINT_FIELD_X(", ", *entry, index);
+ PRINT_FIELD_FLAGS(", ", *entry, flags, kvm_cpuid_flags,
+ "KVM_CPUID_FLAG_???");
+ PRINT_FIELD_X(", ", *entry, eax);
+ PRINT_FIELD_X(", ", *entry, ebx);
+ PRINT_FIELD_X(", ", *entry, ecx);
+ PRINT_FIELD_X(", ", *entry, edx);
+ tprints("}");
+
+ return true;
+}
+
+static int
+kvm_ioctl_decode_cpuid2(struct tcb *const tcp, const unsigned int code,
+ const kernel_ulong_t arg)
+{
+ struct kvm_cpuid2 cpuid;
+
+ if (entering(tcp) && (code == KVM_GET_SUPPORTED_CPUID
+# ifdef KVM_GET_EMULATED_CPUID
+ || code == KVM_GET_EMULATED_CPUID
+# endif
+ ))
+ return 0;
+
+ tprints(", ");
+ if (!umove_or_printaddr(tcp, arg, &cpuid)) {
+ PRINT_FIELD_U("{", cpuid, nent);
+
+ tprints(", entries=");
+ if (abbrev(tcp)) {
+ tprints("[");
+ if (cpuid.nent)
+ tprints("...");
+ tprints("]");
+
+ } else {
+ struct kvm_cpuid_entry2 entry;
+ print_array(tcp, arg + sizeof(cpuid), cpuid.nent,
+ &entry, sizeof(entry), tfetch_mem,
+ print_kvm_cpuid_entry, NULL);
+ }
+ tprints("}");
+ }
+
+ return RVAL_IOCTL_DECODED;
+}
+# endif /* HAVE_STRUCT_KVM_CPUID2 */
+
+# ifdef HAVE_STRUCT_KVM_SREGS
+static int
+kvm_ioctl_decode_sregs(struct tcb *const tcp, const unsigned int code,
+ const kernel_ulong_t arg)
+{
+ struct kvm_sregs sregs;
+
+ if (code == KVM_GET_SREGS && entering(tcp))
+ return 0;
+
+ tprints(", ");
+ if (!umove_or_printaddr(tcp, arg, &sregs))
+ arch_print_kvm_sregs(tcp, arg, &sregs);
+
+ return RVAL_IOCTL_DECODED;
+}
+# endif /* HAVE_STRUCT_KVM_SREGS */
+
+# include "xlat/kvm_cap.h"
+static int
+kvm_ioctl_decode_check_extension(struct tcb *const tcp, const unsigned int code,
+ const kernel_ulong_t arg)
+{
+ tprints(", ");
+ printxval_index(kvm_cap, arg, "KVM_CAP_???");
+ return RVAL_IOCTL_DECODED;
+}
+
+# include "xlat/kvm_exit_reason.h"
+static void
+kvm_ioctl_run_attach_auxstr(struct tcb *const tcp,
+ struct vcpu_info *info)
+
+{
+ static struct kvm_run vcpu_run_struct;
+
+ if (info->mmap_len < sizeof(vcpu_run_struct))
+ return;
+
+ if (umove(tcp, info->mmap_addr, &vcpu_run_struct) < 0)
+ return;
+
+ tcp->auxstr = xlat_idx(kvm_exit_reason, ARRAY_SIZE(kvm_exit_reason) - 1,
+ vcpu_run_struct.exit_reason);
+ if (!tcp->auxstr)
+ tcp->auxstr = "KVM_EXIT_???";
+}
+
+static int
+kvm_ioctl_decode_run(struct tcb *const tcp)
+{
+
+ if (entering(tcp))
+ return 0;
+
+ int r = RVAL_DECODED;
+
+ if (syserror(tcp))
+ return r;
+
+ if (dump_kvm_run_structure) {
+ tcp->auxstr = NULL;
+ int fd = tcp->u_arg[0];
+ struct vcpu_info *info = vcpu_get_info(tcp, fd);
+
+ if (info) {
+ kvm_ioctl_run_attach_auxstr(tcp, info);
+ if (tcp->auxstr)
+ r |= RVAL_STR;
+ }
+ }
+
+ return r;
+}
+
int
kvm_ioctl(struct tcb *const tcp, const unsigned int code, const kernel_ulong_t arg)
{
return kvm_ioctl_set_user_memory_region(tcp, arg);
# endif
+# ifdef HAVE_STRUCT_KVM_REGS
+ case KVM_SET_REGS:
+ case KVM_GET_REGS:
+ return kvm_ioctl_decode_regs(tcp, code, arg);
+# endif
+
+# ifdef HAVE_STRUCT_KVM_SREGS
+ case KVM_SET_SREGS:
+ case KVM_GET_SREGS:
+ return kvm_ioctl_decode_sregs(tcp, code, arg);
+# endif
+
+# ifdef HAVE_STRUCT_KVM_CPUID2
+ case KVM_SET_CPUID2:
+ case KVM_GET_SUPPORTED_CPUID:
+# ifdef KVM_GET_EMULATED_CPUID
+ case KVM_GET_EMULATED_CPUID:
+# endif
+ return kvm_ioctl_decode_cpuid2(tcp, code, arg);
+# endif
+
+ case KVM_CHECK_EXTENSION:
+ return kvm_ioctl_decode_check_extension(tcp, code, arg);
+
case KVM_CREATE_VM:
return RVAL_DECODED | RVAL_FD;
+
case KVM_RUN:
+ return kvm_ioctl_decode_run(tcp);
+
case KVM_GET_VCPU_MMAP_SIZE:
case KVM_GET_API_VERSION:
default:
}
}
+void
+kvm_run_structure_decoder_init(void)
+{
+ dump_kvm_run_structure = true;
+ mmap_cache_enable();
+}
+
#endif /* HAVE_LINUX_KVM_H */
projects / strace / blobdiff