diff options
Diffstat (limited to 'drivers/kvm/x86_emulate.c')
| -rw-r--r-- | drivers/kvm/x86_emulate.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c index 92620e4..f60012d 100644 --- a/drivers/kvm/x86_emulate.c +++ b/drivers/kvm/x86_emulate.c @@ -485,6 +485,7 @@ x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) int mode = ctxt->mode; unsigned long modrm_ea; int use_modrm_ea, index_reg = 0, base_reg = 0, scale, rip_relative = 0; + int no_wb = 0; /* Shadow copy of register state. Committed on successful emulation. */ unsigned long _regs[NR_VCPU_REGS]; @@ -1051,7 +1052,7 @@ done_prefixes: _regs[VCPU_REGS_RSP]), &dst.val, dst.bytes, ctxt)) != 0) goto done; - dst.val = dst.orig_val; /* skanky: disable writeback */ + no_wb = 1; break; default: goto cannot_emulate; @@ -1060,7 +1061,7 @@ done_prefixes: } writeback: - if ((d & Mov) || (dst.orig_val != dst.val)) { + if (!no_wb) { switch (dst.type) { case OP_REG: /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */ @@ -1168,7 +1169,7 @@ pop_instruction: goto done; register_address_increment(_regs[VCPU_REGS_RSP], op_bytes); - dst.orig_val = dst.val; /* Disable writeback. */ + no_wb = 1; /* Disable writeback. */ break; } goto writeback; @@ -1323,7 +1324,7 @@ twobyte_insn: twobyte_special_insn: /* Disable writeback. */ - dst.orig_val = dst.val; + no_wb = 1; switch (b) { case 0x09: /* wbinvd */ break; |