search for: op_bytes

...+} + static void decode_register_operand(struct x86_emulate_ctxt *ctxt, struct operand *op) { @@ -1187,7 +1208,7 @@ static void decode_register_operand(struct x86_emulate_ctxt *ctxt, if (ctxt->d & Sse) { op->type = OP_XMM; - op->bytes = 16; + op->bytes = ctxt->op_bytes; op->addr.xmm = reg; read_sse_reg(ctxt, &op->vec_val, reg); return; @@ -1238,7 +1259,7 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt, ctxt->d & ByteOp); if (ctxt->d & Sse) { op->type = OP_XMM; - op->bytes = 16; + op->bytes = ctxt-...

...c.val) ); _regs.eflags &= ~EFLG_ZF; - if ( zf ) + if ( (rep_prefix == REPE_PREFIX) && vcpu_has_bmi1() ) + { + _regs.eflags &= ~EFLG_CF; + if ( zf ) + { + _regs.eflags |= EFLG_CF; + dst.val = op_bytes * 8; + } + else if ( !dst.val ) + _regs.eflags |= EFLG_ZF; + } + else if ( zf ) { _regs.eflags |= EFLG_ZF; dst.type = OP_NONE; @@ -4371,13 +4385,28 @@ x86_emulate( break; } - case 0xbd: /* bsr *...

...rep_prefix() ) \ __put_rep_prefix(&_regs, ctxt->regs, ad_bytes, reps_completed); \ }) @@ -1328,9 +1332,7 @@ x86_emulate( uint8_t modrm = 0, modrm_mod = 0, modrm_reg = 0, modrm_rm = 0; union vex vex = {}; unsigned int op_bytes, def_op_bytes, ad_bytes, def_ad_bytes; -#define REPE_PREFIX 1 -#define REPNE_PREFIX 2 - unsigned int lock_prefix = 0, rep_prefix = 0; + bool_t lock_prefix = 0; int override_seg = -1, rc = X86EMUL_OKAY; struct operand src, dst; DECLARE_ALIGNED(mmval_t, mmval); @@ -1359,7 +1361,...

...unsigned long sel; - generate_exception_if(dst.type != OP_MEM, EXC_UD, -1); + generate_exception_if(src.type != OP_MEM, EXC_UD, -1); - if ( (rc = read_ulong(dst.mem.seg, dst.mem.off+dst.bytes, + if ( (rc = read_ulong(src.mem.seg, src.mem.off + op_bytes, &sel, 2, ctxt, ops)) ) goto done; @@ -3600,7 +3599,7 @@ x86_emulate( if ( (rc = load_seg(x86_seg_cs, sel, ctxt, ops)) != 0 ) goto done; - _regs.eip = dst.val; + _regs.eip = src.val;...

This set of patches converts the way frames gets created from using PUSHes/POPs to using MOVes, thus allowing (in certain cases) to avoid saving/restoring part of the register set. While the place where the (small) win from this comes from varies between CPUs, the net effect is a 1 to 2% reduction on a combined interruption entry and exit when the full state save can be avoided. 1: use MOV

...- _regs.eax = old_lo; - _regs.edx = old_hi; - _regs.eflags &= ~EFLG_ZF; - } - else if ( ops->cmpxchg8b == NULL ) - { - rc = X86EMUL_UNHANDLEABLE; - goto done; - } - else +#ifdef __x86_64__ + if ( op_bytes != 8 ) { - if ( (rc = ops->cmpxchg8b(ea.mem.seg, ea.mem.off, old_lo, old_hi, - _regs.ebx, _regs.ecx, ctxt)) != 0 ) + unsigned long old, new; + + if ( (rc = ops->read(ea.mem.seg, ea.mem.off, &old, 8, ctxt)) != 0...

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

This patch series is a reworking of a series developed by Mukesh Rathor at Oracle. The entirety of the design and development was done by him; I have only reworked, reorganized, and simplified things in a way that I think makes more sense. The vast majority of the credit for this effort therefore goes to him. This version is labelled v13 because it is based on his most recent series, v11.