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kvm: decode the argument of KVM_{SET, GET}_SREGS ioctl command

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* configure.ac (AC_CHECK_TYPES): Add struct kvm_sregs.
* kvm.c [HAVE_STRUCT_KVM_SREGS] (kvm_ioctl_decode_sregs): New function.
(kvm_ioctl) [HAVE_STRUCT_KVM_SREGS] <KVM_SET_SREGS, KVM_GET_SREGS>:
Use it.
* linux/arch_kvm.c (arch_print_kvm_sregs): New function.
* linux/x86_64/arch_kvm.c (PRINT_FIELD_KVM_SREGS_STRUCT): New macro.
(kvm_ioctl_decode_regs_dtable, kvm_ioctl_decode_regs_segment,
arch_print_kvm_sregs): New functions.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
This commit is contained in:
Masatake YAMATO 2017-12-04 22:08:16 +09:00 committed by Dmitry V. Levin
parent 1d3b9b2c94
commit 647709d8e5
4 changed files with 107 additions and 0 deletions

1
configure.ac

@ -543,6 +543,7 @@ AC_CHECK_TYPES([struct blk_user_trace_setup],,, [#include <linux/blktrace_api.h>
AC_CHECK_TYPES(m4_normalize([
struct kvm_regs,
struct kvm_sregs,
struct kvm_userspace_memory_region
]),,, [#include <linux/kvm.h>])

24
kvm.c

@ -85,6 +85,24 @@ kvm_ioctl_decode_regs(struct tcb *const tcp, const unsigned int code,
}
# endif /* HAVE_STRUCT_KVM_REGS */
# 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 */
int
kvm_ioctl(struct tcb *const tcp, const unsigned int code, const kernel_ulong_t arg)
{
@ -103,6 +121,12 @@ kvm_ioctl(struct tcb *const tcp, const unsigned int code, const kernel_ulong_t a
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
case KVM_CREATE_VM:
return RVAL_DECODED | RVAL_FD;
case KVM_RUN:

10
linux/arch_kvm.c

@ -7,3 +7,13 @@ arch_print_kvm_regs(struct tcb *const tcp,
printaddr(addr);
}
#endif /* HAVE_STRUCT_KVM_REGS */
#ifdef HAVE_STRUCT_KVM_SREGS
static void
arch_print_kvm_sregs(struct tcb *const tcp,
const kernel_ulong_t addr,
const struct kvm_sregs *const sregs)
{
printaddr(addr);
}
#endif /* HAVE_STRUCT_KVM_SREGS */

72
linux/x86_64/arch_kvm.c

@ -36,3 +36,75 @@ arch_print_kvm_regs(struct tcb *const tcp,
tprints("}");
}
#endif /* HAVE_STRUCT_KVM_REGS */
#ifdef HAVE_STRUCT_KVM_SREGS
static void
kvm_ioctl_decode_regs_segment(const char *prefix,
const struct kvm_segment *const segment)
{
tprints(prefix);
PRINT_FIELD_X("={", *segment, base);
PRINT_FIELD_U(", ", *segment, limit);
PRINT_FIELD_U(", ", *segment, selector);
PRINT_FIELD_U(", ", *segment, type);
PRINT_FIELD_U(", ", *segment, present);
PRINT_FIELD_U(", ", *segment, dpl);
PRINT_FIELD_U(", ", *segment, db);
PRINT_FIELD_U(", ", *segment, s);
PRINT_FIELD_U(", ", *segment, l);
PRINT_FIELD_U(", ", *segment, g);
PRINT_FIELD_U(", ", *segment, avl);
tprints("}");
}
static void
kvm_ioctl_decode_regs_dtable(const char *prefix,
const struct kvm_dtable *const dtable)
{
tprints(prefix);
PRINT_FIELD_X("={", *dtable, base);
PRINT_FIELD_U(", ", *dtable, limit);
tprints("}");
}
# define PRINT_FIELD_KVM_SREGS_STRUCT(prefix_, where_, type_, field_) \
kvm_ioctl_decode_regs_ ## type_(prefix_ #field_, &(where_)->field_)
static void
arch_print_kvm_sregs(struct tcb *const tcp,
const kernel_ulong_t addr,
const struct kvm_sregs *const sregs)
{
PRINT_FIELD_KVM_SREGS_STRUCT("{", sregs, segment, cs);
if (abbrev(tcp)) {
tprints(", ...}");
return;
}
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, segment, ds);
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, segment, es);
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, segment, fs);
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, segment, gs);
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, segment, ss);
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, segment, tr);
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, segment, ldt);
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, dtable, gdt);
PRINT_FIELD_KVM_SREGS_STRUCT(", ", sregs, dtable, idt);
PRINT_FIELD_U(", ", *sregs, cr0);
PRINT_FIELD_U(", ", *sregs, cr2);
PRINT_FIELD_U(", ", *sregs, cr3);
PRINT_FIELD_U(", ", *sregs, cr4);
PRINT_FIELD_U(", ", *sregs, cr8);
PRINT_FIELD_U(", ", *sregs, efer);
PRINT_FIELD_X(", ", *sregs, apic_base);
tprints(", interrupt_bitmap=[");
unsigned int i;
for (i = 0; i < ARRAY_SIZE(sregs->interrupt_bitmap); i++) {
if (i != 0)
tprints(", ");
tprintf("%#" PRI__x64, sregs->interrupt_bitmap[i]);
}
tprints("]}");
}
#endif /* HAVE_STRUCT_KVM_SREGS */