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2011-12-27KVM: x86 emulator: implement RDPMC (0F 33)Avi Kivity1-0/+1
Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-27KVM: x86: retry non-page-table writing instructionsXiao Guangrong1-0/+1
If the emulation is caused by #PF and it is non-page_table writing instruction, it means the VM-EXIT is caused by shadow page protected, we can zap the shadow page and retry this instruction directly The idea is from Avi Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-09-25KVM: x86 emulator: expand decode flags to 64 bitsAvi Kivity1-1/+1
Unifiying the operands means not taking advantage of the fact that some operand types can only go into certain operands (for example, DI can only be used by the destination), so we need more bits to hold the operand type. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-09-25KVM: x86 emulator: move memop, memopp into emulation contextAvi Kivity1-0/+2
Simplifies further generalization of decode. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-07-12KVM: x86 emulator: fold decode_cache into x86_emulate_ctxtAvi Kivity1-24/+20
This saves a lot of pointless casts x86_emulate_ctxt and decode_cache. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-07-12KVM: x86 emulator: rename decode_cache::eip to _eipAvi Kivity1-1/+1
The name eip conflicts with a field of the same name in x86_emulate_ctxt, which we plan to fold decode_cache into. The name _eip is unfortunate, but what's really needed is a refactoring here, not a better name. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-07-12KVM: x86 emulator: Avoid clearing the whole decode_cacheTakuya Yoshikawa1-2/+3
During tracing the emulator, we noticed that init_emulate_ctxt() sometimes took a bit longer time than we expected. This patch is for mitigating the problem by some degree. By looking into the function, we soon notice that it clears the whole decode_cache whose size is about 2.5K bytes now. Furthermore, most of the bytes are taken for the two read_cache arrays, which are used only by a few instructions. Considering the fact that we are not assuming the cache arrays have been cleared when we store actual data, we do not need to clear the arrays: 2K bytes elimination. In addition, we can avoid clearing the fetch_cache and regs arrays. This patch changes the initialization not to clear the arrays. On our 64-bit host, init_emulate_ctxt() becomes 0.3 to 0.5us faster with this patch applied. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-07-12KVM: x86 emulator: Stop passing ctxt->ops as arg of emul functionsTakuya Yoshikawa1-2/+1
Dereference it in the actual users. This not only cleans up the emulator but also makes it easy to convert the old emulation functions to the new em_xxx() form later. Note: Remove some inline keywords to let the compiler decide inlining. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-05-22KVM: x86 emulator: consolidate segment accessorsAvi Kivity1-9/+4
Instead of separate accessors for the segment selector and cached descriptor, use one accessor for both. This simplifies the code somewhat. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: SVM: Get rid of x86_intercept_map::validAvi Kivity1-0/+1
By reserving 0 as an invalid x86_intercept_stage, we no longer need to store a valid flag in x86_intercept_map. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: drop x86_emulate_ctxt::vcpuAvi Kivity1-2/+0
No longer used. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: add new ->wbinvd() callbackAvi Kivity1-0/+1
Instead of calling kvm_emulate_wbinvd() directly. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: add ->fix_hypercall() callbackAvi Kivity1-0/+1
Artificial, but needed to remove direct calls to KVM. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: add new ->halt() callbackAvi Kivity1-0/+1
Instead of reaching into vcpu internals. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: make emulate_invlpg() an emulator callbackAvi Kivity1-0/+1
Removing direct calls to KVM. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: add and use new callbacks set_idt(), set_gdt()Avi Kivity1-0/+2
Replacing direct calls to realmode_lgdt(), realmode_lidt(). Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: drop vcpu argument from intercept callbackAvi Kivity1-1/+1
Making the emulator caller agnostic. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: drop vcpu argument from cr/dr/cpl/msr callbacksAvi Kivity1-7/+7
Making the emulator caller agnostic. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-22KVM: x86 emulator: drop vcpu argument from segment/gdt/idt callbacksAvi Kivity1-9/+13
Making the emulator caller agnostic. [Takuya Yoshikawa: fix typo leading to LDT failures] Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: drop vcpu argument from pio callbacksAvi Kivity1-4/+6
Making the emulator caller agnostic. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: drop vcpu argument from memory read/write callbacksAvi Kivity1-18/+16
Making the emulator caller agnostic. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: emulator: Use linearize() when fetching instructionsNelson Elhage1-1/+0
Since segments need to be handled slightly differently when fetching instructions, we add a __linearize helper that accepts a new 'fetch' boolean. [avi: fix oops caused by wrong segmented_address initialization order] Signed-off-by: Nelson Elhage <nelhage@ksplice.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: SVM: Add checks for IO instructionsJoerg Roedel1-0/+4
This patch adds code to check for IOIO intercepts on instructions decoded by the KVM instruction emulator. [avi: fix build error due to missing #define D2bvIP] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: SVM: Add intercept checks for remaining twobyte instructionsJoerg Roedel1-0/+2
This patch adds intercepts checks for the remaining twobyte instructions to the KVM instruction emulator. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: SVM: Add intercept check for accessing dr registersJoerg Roedel1-0/+2
This patch adds the intercept checks for instruction accessing the debug registers. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: SVM: Add intercept check for emulated cr accessesJoerg Roedel1-0/+3
This patch adds all necessary intercept checks for instructions that access the crX registers. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86: Add x86 callback for intercept checkJoerg Roedel1-2/+20
This patch adds a callback into kvm_x86_ops so that svm and vmx code can do intercept checks on emulated instructions. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: Add flag to check for protected mode instructionsJoerg Roedel1-0/+4
This patch adds a flag for the opcoded to tag instruction which are only recognized in protected mode. The necessary check is added too. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: Add check_perm callbackJoerg Roedel1-0/+1
This patch adds a check_perm callback for each opcode into the instruction emulator. This will be used to do all necessary permission checks on instructions before checking whether they are intercepted or not. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: Don't write-back cpu-state on X86EMUL_INTERCEPTEDJoerg Roedel1-0/+1
This patch prevents the changed CPU state to be written back when the emulator detected that the instruction was intercepted by the guest. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: add SVM interceptsAvi Kivity1-0/+35
Add intercept codes for instructions defined by SVM as interceptable. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: add framework for instruction interceptsAvi Kivity1-0/+20
When running in guest mode, certain instructions can be intercepted by hardware. This also holds for nested guests running on emulated virtualization hardware, in particular instructions emulated by kvm itself. This patch adds a framework for intercepting instructions. If an instruction is marked for interception, and if we're running in guest mode, a callback is called to check whether an intercept is needed or not. The callback is called at three points in time: immediately after beginning execution, after checking privilge exceptions, and after checking memory exception. This suits the different interception points defined for different instructions and for the various virtualization instruction sets. In addition, a new X86EMUL_INTERCEPT is defined, which any callback or memory access may define, allowing the more complicated intercepts to be implemented in existing callbacks. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: SSE supportAvi Kivity1-1/+5
Add support for marking an instruction as SSE, switching registers used to the SSE register file. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: define callbacks for using the guest fpu within the emulatorAvi Kivity1-0/+2
Needed for emulating fpu instructions. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11KVM: x86 emulator: do not munge rep prefixAvi Kivity1-2/+2
Currently we store a rep prefix as 1 or 2 depending on whether it is a REPE or REPNE. Since sse instructions depend on the prefix value, store it as the original opcode to simplify things further on. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-03-17KVM: emulator: Fix io permission checking for 64bit guestGleb Natapov1-2/+2
Current implementation truncates upper 32bit of TR base address during IO permission bitmap check. The patch fixes this. Reported-and-tested-by: Francis Moreau <francis.moro@gmail.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-03-17KVM: x86 emulator: vendor specific instructionsAvi Kivity1-0/+1
Mark some instructions as vendor specific, and allow the caller to request emulation only of vendor specific instructions. This is useful in some circumstances (responding to a #UD fault). Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12KVM: SVM: copy instruction bytes from VMCBAndre Przywara1-1/+1
In case of a nested page fault or an intercepted #PF newer SVM implementations provide a copy of the faulting instruction bytes in the VMCB. Use these bytes to feed the instruction emulator and avoid the costly guest instruction fetch in this case. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12KVM: Pull extra page fault information into struct x86_exceptionAvi Kivity1-0/+2
Currently page fault cr2 and nesting infomation are carried outside the fault data structure. Instead they are placed in the vcpu struct, which results in confusion as global variables are manipulated instead of passing parameters. Fix this issue by adding address and nested fields to struct x86_exception, so this struct can carry all information associated with a fault. Signed-off-by: Avi Kivity <avi@redhat.com> Tested-by: Joerg Roedel <joerg.roedel@amd.com> Tested-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12KVM: x86 emulator: make emulator memory callbacks return full exceptionAvi Kivity1-6/+9
This way, they can return #GP, not just #PF. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12KVM: x86 emulator: introduce struct x86_exception to communicate faultsAvi Kivity1-3/+8
Introduce a structure that can contain an exception to be passed back to main kvm code. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12KVM: x86 emulator: preserve an operand's segment identityAvi Kivity1-1/+4
Currently the x86 emulator converts the segment register associated with an operand into a segment base which is added into the operand address. This loss of information results in us not doing segment limit checks properly. Replace struct operand's addr.mem field by a segmented_address structure which holds both the effetive address and segment. This will allow us to do the limit check at the point of access. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24KVM: x86 emulator: Expose emulate_int_real()Mohammed Gamal1-1/+2
Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24KVM: MMU: Track page fault data in struct vcpuJoerg Roedel1-1/+0
This patch introduces a struct with two new fields in vcpu_arch for x86: * fault.address * fault.error_code This will be used to correctly propagate page faults back into the guest when we could have either an ordinary page fault or a nested page fault. In the case of a nested page fault the fault-address is different from the original address that should be walked. So we need to keep track about the real fault-address. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24KVM: x86 emulator: get rid of "restart" in emulation context.Gleb Natapov1-1/+3
x86_emulate_insn() will return 1 if instruction can be restarted without re-entering a guest. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24KVM: x86 emulator: Allow accessing IDT via emulator opsMohammed Gamal1-0/+1
The patch adds a new member get_idt() to x86_emulate_ops. It also adds a function to get the idt in order to be used by the emulator. This is needed for real mode interrupt injection and the emulation of int instructions. Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24KVM: x86 emulator: Decode memory operands directly into a 'struct operand'Avi Kivity1-3/+0
Since modrm operand can be either register or memory, decoding it into a 'struct operand', which can represent both, is simpler. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24KVM: x86 emulator: drop use_modrm_eaAvi Kivity1-1/+0
Unused (and has never been). Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24KVM: x86 emulator: use correct type for memory address in operandsAvi Kivity1-1/+4
Currently we use a void pointer for memory addresses. That's wrong since these are guest virtual addresses which are not directly dereferencable by the host. Use the correct type, unsigned long. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24KVM: x86 emulator: push segment override out of decode_modrm()Avi Kivity1-0/+1
Let it compute modrm_seg instead, and have the caller apply it. Signed-off-by: Avi Kivity <avi@redhat.com>
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