[PATCH 6/8] kvm: decode the argument for KVM_{SET, GET}_REGS ioctl command

[Masatake YAMATO]

* kvm.c (kvm_ioctl): Handle KVM_SET_REGS and KVM_GET_REGES.
(kvm_ioctl_decode_regs): New function.

Signed-off-by: Masatake YAMATO <yam...@redhat.com>
---
 kvm.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/kvm.c b/kvm.c
index 43746fef..69a8c97a 100644
--- a/kvm.c
+++ b/kvm.c
@@ -72,6 +72,55 @@ kvm_ioctl_set_user_memory_region(struct tcb *const tcp, 
const kernel_ulong_t arg
        return RVAL_IOCTL_DECODED;
 }
 
+static int
+kvm_ioctl_decode_regs(struct tcb *const tcp, const unsigned int code, const 
kernel_ulong_t arg)
+{
+#ifdef X86_64
+       struct kvm_regs regs;
+
+       if (code == KVM_GET_REGS && entering(tcp))
+               return 0;
+
+       if (umove(tcp, arg, &regs) < 0)
+               return RVAL_DECODED;
+
+       PRINT_FIELD_X(", {", regs, rax);
+       if (abbrev(tcp))
+               tprints(", ...");
+       else {
+               PRINT_FIELD_X(", ",  regs, rbx);
+               PRINT_FIELD_X(", ",  regs, rcx);
+               PRINT_FIELD_X(", ",  regs, rdx);
+               PRINT_FIELD_X(", ",  regs, rsi);
+               PRINT_FIELD_X(", ",  regs, rdi);
+       }
+       PRINT_FIELD_X(", ",  regs, rsp);
+       PRINT_FIELD_X(", ",  regs, rbp);
+       if (abbrev(tcp))
+               tprints(", ...");
+       else {
+               PRINT_FIELD_X(", ",  regs, r8);
+               PRINT_FIELD_X(", ",  regs, r9);
+               PRINT_FIELD_X(", ",  regs, r10);
+               PRINT_FIELD_X(", ",  regs, r11);
+               PRINT_FIELD_X(", ",  regs, r12);
+               PRINT_FIELD_X(", ",  regs, r13);
+               PRINT_FIELD_X(", ",  regs, r14);
+               PRINT_FIELD_X(", ",  regs, r15);
+       }
+       PRINT_FIELD_X(", ",  regs, rip);
+
+       /* TODO: we can decode this more */
+       PRINT_FIELD_X(", ",  regs, rflags);
+
+       tprints("}");
+
+       return RVAL_IOCTL_DECODED;
+#else
+       return RVAL_DECODED;
+#endif
+}
+
 int
 kvm_ioctl(struct tcb *const tcp, const unsigned int code, const kernel_ulong_t 
arg)
 {
@@ -82,6 +131,9 @@ kvm_ioctl(struct tcb *const tcp, const unsigned int code, 
const kernel_ulong_t a
                return kvm_ioctl_create_vm(tcp, arg);
        case KVM_SET_USER_MEMORY_REGION:
                return kvm_ioctl_set_user_memory_region(tcp, arg);
+       case KVM_SET_REGS:
+       case KVM_GET_REGS:
+               return kvm_ioctl_decode_regs(tcp, code, arg);
 
        /* Commands not taking any arguments. */
        case KVM_RUN:
-- 
2.13.6


------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Strace-devel mailing list
Strace-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/strace-devel