diff options
| author | Nadav Amit <namit@cs.technion.ac.il> | 2014-06-18 18:19:35 +0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-07-11 11:14:05 +0400 |
| commit | 68efa764f3429f2bd71f431e91c04b0bcb7d34f1 (patch) | |
| tree | bc0a388fb542ff2c634722863dfa72a521b6dd7d | |
| parent | 10e38fc7cabc668738e6a7b7b57cbcddb2234440 (diff) | |
| download | linux-68efa764f3429f2bd71f431e91c04b0bcb7d34f1.tar.xz | |
KVM: x86: Emulator support for #UD on CPL>0
Certain instructions (e.g., mwait and monitor) cause a #UD exception when they
are executed in user mode. This is in contrast to the regular privileged
instructions which cause #GP. In order not to mess with SVM interception of
mwait and monitor which assumes privilege level assertions take place before
interception, a flag has been added.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/emulate.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index b61ffe9d86a7..dd074106d0c9 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -165,6 +165,7 @@ #define Intercept ((u64)1 << 48) /* Has valid intercept field */ #define CheckPerm ((u64)1 << 49) /* Has valid check_perm field */ #define NoBigReal ((u64)1 << 50) /* No big real mode */ +#define PrivUD ((u64)1 << 51) /* #UD instead of #GP on CPL > 0 */ #define DstXacc (DstAccLo | SrcAccHi | SrcWrite) @@ -4608,7 +4609,10 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) /* Privileged instruction can be executed only in CPL=0 */ if ((ctxt->d & Priv) && ops->cpl(ctxt)) { - rc = emulate_gp(ctxt, 0); + if (ctxt->d & PrivUD) + rc = emulate_ud(ctxt); + else + rc = emulate_gp(ctxt, 0); goto done; } |