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path: root/drivers/kvm/x86_emulate.c
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2008-01-30KVM: Move arch dependent files to new directory arch/x86/kvm/Avi Kivity
This paves the way for multiple architecture support. Note that while ioapic.c could potentially be shared with ia64, it is also moved. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: Portability: Introduce kvm_vcpu_archZhang Xiantao
Move all the architecture-specific fields in kvm_vcpu into a new struct kvm_vcpu_arch. Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com> Acked-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Fix stack instructions on 64-bit modeAvi Kivity
Stack instructions are always 64-bit on 64-bit mode; many of the emulated stack instructions did not take that into account. Fix by adding a 'Stack' bitflag and setting the operand size appropriately during the decode stage (except for 'push r/m', which is in a group with a few other instructions, so it gets its own treatment). This fixes random crashes on Vista x64. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: fix eflags preparation for emulationAvi Kivity
We prepare eflags for the emulated instruction, then clobber it with an 'andl'. Fix by popping eflags as the last thing in the sequence. Patch taken from Xen (16143:959b4b92b6bf) Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: Replace #GP injection by the generalized exception queueAvi Kivity
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: unify four switch statements into twoAvi Kivity
Unify the special instruction switch with the regular instruction switch, and the two byte special instruction switch with the regular two byte instruction switch. That makes it much easier to find an instruction or the place an instruction needs to be added in. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: unify two switchesAvi Kivity
The rep prefix cleanup left two switch () statements next to each other. Unify them. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Move rep processing before instruction executionAvi Kivity
Currently rep processing is handled somewhere in the middle of instruction processing. Move it to a sensible place. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: cmps instructionGuillaume Thouvenin
Add emulation for the cmps instruction. This lets OpenBSD boot on kvm. Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Rename 'cr2' to 'memop'Sheng Yang
Previous patches have removed the dependency on cr2; we can now stop passing it to the emulator and rename uses to 'memop'. Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: address size and operand size overrides are stickyAvi Kivity
Current implementation is to toggle, which is incorrect. Patch ported from corresponding Xen code. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Make a distinction between repeat prefixes F3 and F2Guillaume Thouvenin
cmps and scas instructions accept repeat prefixes F3 and F2. So in order to emulate those prefixed instructions we need to be able to know if prefixes are REP/REPE/REPZ or REPNE/REPNZ. Currently kvm doesn't make this distinction. This patch introduces this distinction. Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: prefetch up to 15 bytes of the instruction executedAvi Kivity
Instead of fetching one byte at a time, prefetch 15 bytes (or until the next page boundary) to avoid guest page table walks. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: modify 'lods', and 'stos' not to depend on CR2Sheng Yang
The current 'lods' and 'stos' is depending on incoming CR2 rather than decode memory address from registers. Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: remove 8 bytes operands emulator for call near instructionIzik Eidus
it is removed beacuse it isnt supported on a real host Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Hoist modrm and abs decoding into separate functionsAvi Kivity
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: Simplify decode_register_operand() calling conventionAvi Kivity
Now that rex_prefix is part of the decode cache, there is no need to pass it along. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: centralize decoding of one-byte register access insnsAvi Kivity
Instructions like 'inc reg' that have the register operand encoded in the opcode are currently specially decoded. Extend decode_register_operand() to handle that case, indicated by having DstReg or SrcReg without ModRM. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Extract the common code of SrcReg and DstRegAvi Kivity
Share the common parts of SrcReg and DstReg decoding. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: don't depend on cr2 for mov abs emulationAvi Kivity
The 'mov abs' instruction family (opcodes 0xa0 - 0xa3) still depends on cr2 provided by the page fault handler. This is wrong for several reasons: - if an instruction accessed misaligned data that crosses a page boundary, and if the fault happened on the second page, cr2 will point at the second page, not the data itself. - if we're emulating in real mode, or due to a FlexPriority exit, there is no cr2 generated. So, this change adds decoding for this instruction form and drops reliance on cr2. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: Portability: Split kvm_vcpu into arch dependent and independent parts ↵Zhang Xiantao
(part 1) First step to split kvm_vcpu. Currently, we just use an macro to define the common fields in kvm_vcpu for all archs, and all archs need to define its own kvm_vcpu struct. Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: cmc, clc, cli, stiNitin A Kamble
Instruction: cmc, clc, cli, sti opcodes: 0xf5, 0xf8, 0xfa, 0xfb respectively. [avi: fix reference to EFLG_IF which is not defined anywhere] Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Implement emulation of instruction: inc & decNitin A Kamble
Instructions: inc r16/r32 (opcode 0x40-0x47) dec r16/r32 (opcode 0x48-0x4f) Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: CodingStyle cleanupMike Day
Signed-off-by: Mike D. Day <ncmike@ncultra.org> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Any legacy prefix after a REX prefix nullifies its effectLaurent Vivier
This patch modifies the management of REX prefix according behavior I saw in Xen 3.1. In Xen, this modification has been introduced by Jan Beulich. http://lists.xensource.com/archives/html/xen-changelog/2007-01/msg00081.html Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86_emulator: no writeback for btQing He
Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Remove no_wb, use dst.type = OP_NONE insteadLaurent Vivier
Remove no_wb, use dst.type = OP_NONE instead, idea stollen from xen-3.1 Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: remove _eflags and use directly ctxt->eflags.Laurent Vivier
Remove _eflags and use directly ctxt->eflags. Caching eflags is not needed as it is restored to vcpu by kvm_main.c:emulate_instruction() from ctxt->eflags only if emulation doesn't fail. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: split some decoding into functions for readabilityLaurent Vivier
To improve readability, move push, writeback, and grp 1a/2/3/4/5/9 emulation parts into functions. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: Call x86_decode_insn() only when neededLaurent Vivier
Move emulate_ctxt to kvm_vcpu to keep emulate context when we exit from kvm module. Call x86_decode_insn() only when needed. Modify x86_emulate_insn() to not modify the context if it must be re-entered. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: emulate_instruction() calls now x86_decode_insn() and x86_emulate_insn()Laurent Vivier
emulate_instruction() calls now x86_decode_insn() and x86_emulate_insn(). x86_emulate_insn() is x86_emulate_memop() without the decoding part. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: move all decoding process to function x86_decode_insn()Laurent Vivier
Split the decoding process into a new function x86_decode_insn(). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: move all x86_emulate_memop() to a structureLaurent Vivier
Move all x86_emulate_memop() common variables between decode and execute to a structure decode_cache. This will help in later separating decode and emulate. struct decode_cache { u8 twobyte; u8 b; u8 lock_prefix; u8 rep_prefix; u8 op_bytes; u8 ad_bytes; struct operand src; struct operand dst; unsigned long *override_base; unsigned int d; unsigned long regs[NR_VCPU_REGS]; unsigned long eip; /* modrm */ u8 modrm; u8 modrm_mod; u8 modrm_reg; u8 modrm_rm; u8 use_modrm_ea; unsigned long modrm_ea; unsigned long modrm_val; }; Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: remove unused functionsLaurent Vivier
Remove #ifdef functions never used Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: Refactor hypercall infrastructure (v3)Anthony Liguori
This patch refactors the current hypercall infrastructure to better support live migration and SMP. It eliminates the hypercall page by trapping the UD exception that would occur if you used the wrong hypercall instruction for the underlying architecture and replacing it with the right one lazily. A fall-out of this patch is that the unhandled hypercalls no longer trap to userspace. There is very little reason though to use a hypercall to communicate with userspace as PIO or MMIO can be used. There is no code in tree that uses userspace hypercalls. [avi: fix #ud injection on vmx] Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30KVM: x86 emulator: Add vmmcall/vmcall to x86_emulate (v3)Anthony Liguori
Add vmmcall/vmcall to x86_emulate. Future patch will implement functionality for these instructions. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-11-27KVM: x86 emulator: Use emulator_write_emulated and not emulator_write_stdAmit Shah
emulator_write_std() is not implemented, and calling write_emulated should work just as well in place of write_std. Fixes emulator failures with the push r/m instruction. Signed-off-by: Amit Shah <amit.shah@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-11-27KVM: x86 emulator: fix the saving of of the eip valueIzik Eidus
this make sure that no matter what is the operand size, all the value of the eip will be saved Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-11-27KVM: x86 emulator: fix JMP_RELIzik Eidus
Change JMP_REL to call to register_address_increment(): the operands size should not effect the calculation of the eip, instead the ad_bytes should affect it. Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-11-08KVM: x86 emulator: invd instructionAvi Kivity
Emulate the 'invd' instruction (opcode 0f 08). Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-11-08KVM: x86 emulator: fix 'push imm8' emulationAvi Kivity
'push imm8' found itself in the wrong switch somehow, so it is never executed. This fixes Windows 2003 installation. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-22KVM: x86 emulator: fix access registers for instructions with ModR/M byte ↵Aurelien Jarno
and Mod = 3 The patch belows changes the access type to register from memory for instructions that are declared as SrcMem or DstMem, but have a ModR/M byte with Mod = 3. It fixes (at least) the lmsw and smsw instructions on an AMD64 CPU, which are needed for FreeBSD. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-22KVM: x86 emulator: implement 'movnti mem, reg'Sheng Yang
Implement emulation of instruction: movnti m32/m64, r32/r64 opcode: 0x0f 0xc3 Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-22KVM: x86 emulator: fix repne/repnz decodingLaurent Vivier
The repnz/repne instructions must set rep_prefix to 1 like rep/repe/repz. This patch correct the disk probe problem met with OpenBSD. This issue appears with commit e70669abd4e60dfea3ac1639848e20e2b8dd1255 because before it, the decoding was done internally to kvm and after it is done by x86_emulate.c (which doesn't do it correctly). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-22KVM: x86 emulator: fix merge screwup due to emulator splitNitin A Kamble
This code has gone to wrong place in the file. Moving it back to right location. Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13KVM: x86 emulator: popfNitin A Kamble
Implement emulation of instruction: popf opcode: 0x9d Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13KVM: x86 emulator: fix src, dst value initializationNitin A Kamble
Some operand fetches are less than the machine word size and can result in stale bits if used together with operands of different sizes. Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13KVM: x86 emulator: jmp absNitin A Kamble
Implement emulation of instruction: jump absolute r/m opcode: 0xff /4 Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13KVM: x86 emulator: leaNitin A Kamble
Implement emulation of instruction lea r16/r32, m opcode: 0x8d: Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-13KVM: X86 emulator: jump conditional shortNitin A Kamble
Implement emulation of more jump conditional instructions jcc shortrel opcodes: 0x70 - 0x7f Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
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