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2012-09-07crypto: cast6-avx - tune assembler code for more performanceJussi Kivilinna
Patch replaces 'movb' instructions with 'movzbl' to break false register dependencies, interleaves instructions better for out-of-order scheduling and merges constant 16-bit rotation with round-key variable rotation. tcrypt ECB results: Intel Core i5-2450M: size old-vs-new new-vs-generic old-vs-generic enc dec enc dec enc dec 256 1.13x 1.19x 2.05x 2.17x 1.82x 1.82x 1k 1.18x 1.21x 2.26x 2.33x 1.93x 1.93x 8k 1.19x 1.19x 2.32x 2.33x 1.95x 1.95x [v2] - Do instruction interleaving another way to avoid adding new FPU<=>CPU register moves as these cause performance drop on Bulldozer. - Improvements to round-key variable rotation handling. - Further interleaving improvements for better out-of-order scheduling. Cc: Johannes Goetzfried <Johannes.Goetzfried@informatik.stud.uni-erlangen.de> Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-09-07crypto: cast5-avx - tune assembler code for more performanceJussi Kivilinna
Patch replaces 'movb' instructions with 'movzbl' to break false register dependencies, interleaves instructions better for out-of-order scheduling and merges constant 16-bit rotation with round-key variable rotation. tcrypt ECB results (128bit key): Intel Core i5-2450M: size old-vs-new new-vs-generic old-vs-generic enc dec enc dec enc dec 256 1.18x 1.18x 2.45x 2.47x 2.08x 2.10x 1k 1.20x 1.20x 2.73x 2.73x 2.28x 2.28x 8k 1.20x 1.19x 2.73x 2.73x 2.28x 2.29x [v2] - Do instruction interleaving another way to avoid adding new FPU<=>CPU register moves as these cause performance drop on Bulldozer. - Improvements to round-key variable rotation handling. - Further interleaving improvements for better out-of-order scheduling. Cc: Johannes Goetzfried <Johannes.Goetzfried@informatik.stud.uni-erlangen.de> Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-09-07crypto: twofish-avx - tune assembler code for more performanceJussi Kivilinna
Patch replaces 'movb' instructions with 'movzbl' to break false register dependencies and interleaves instructions better for out-of-order scheduling. Tested on Intel Core i5-2450M and AMD FX-8100. tcrypt ECB results: Intel Core i5-2450M: size old-vs-new new-vs-3way old-vs-3way enc dec enc dec enc dec 256 1.12x 1.13x 1.36x 1.37x 1.21x 1.22x 1k 1.14x 1.14x 1.48x 1.49x 1.29x 1.31x 8k 1.14x 1.14x 1.50x 1.52x 1.32x 1.33x AMD FX-8100: size old-vs-new new-vs-3way old-vs-3way enc dec enc dec enc dec 256 1.10x 1.11x 1.01x 1.01x 0.92x 0.91x 1k 1.11x 1.12x 1.08x 1.07x 0.97x 0.96x 8k 1.11x 1.13x 1.10x 1.08x 0.99x 0.97x [v2] - Do instruction interleaving another way to avoid adding new FPU<=>CPU register moves as these cause performance drop on Bulldozer. - Further interleaving improvements for better out-of-order scheduling. Tested-by: Borislav Petkov <bp@alien8.de> Cc: Johannes Goetzfried <Johannes.Goetzfried@informatik.stud.uni-erlangen.de> Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-09-06KVM: use symbolic constant for nr interruptsMichael S. Tsirkin
interrupt_bitmap is KVM_NR_INTERRUPTS bits in size, so just use that instead of hard-coded constants and math. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-06KVM: emulator: optimize "rep ins" handlingGleb Natapov
Optimize "rep ins" by allowing emulator to write back more than one datum at a time. Introduce new operand type OP_MEM_STR which tells writeback() that dst contains pointer to an array that should be written back as opposite to just one data element. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-06KVM: emulator: string_addr_inc() cleanupGleb Natapov
Remove unneeded segment argument. Address structure already has correct segment which was put there during decode. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-06KVM: emulator: make x86 emulation modes enum instead of definesGleb Natapov
Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-06KVM: Provide userspace IO exit completion callbackGleb Natapov
Current code assumes that IO exit was due to instruction emulation and handles execution back to emulator directly. This patch adds new userspace IO exit completion callback that can be set by any other code that caused IO exit to userspace. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-06KVM: move postcommit flush to x86, as mmio sptes are x86 specificMarcelo Tosatti
Other arches do not need this. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> v2: fix incorrect deletion of mmio sptes on gpa move (noticed by Takuya) Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-06KVM: split kvm_arch_flush_shadowMarcelo Tosatti
Introducing kvm_arch_flush_shadow_memslot, to invalidate the translations of a single memory slot. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05xen/mm: return more precise error from xen_remap_domain_range()David Vrabel
Callers of xen_remap_domain_range() need to know if the remap failed because frame is currently paged out. So they can retry the remap later on. Return -ENOENT in this case. This assumes that the error codes returned by Xen are a subset of those used by the kernel. It is unclear if this is defined as part of the hypercall ABI. Acked-by: Andres Lagar-Cavilla <andres@lagarcavilla.org> Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-09-05xen: fix logical error in tlb flushingAlex Shi
While TLB_FLUSH_ALL gets passed as 'end' argument to flush_tlb_others(), the Xen code was made to check its 'start' parameter. That may give a incorrect op.cmd to MMUEXT_INVLPG_MULTI instead of MMUEXT_TLB_FLUSH_MULTI. Then it causes some page can not be flushed from TLB. This patch fixed this issue. Reported-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Alex Shi <alex.shi@intel.com> Acked-by: Jan Beulich <jbeulich@suse.com> Tested-by: Yongjie Ren <yongjie.ren@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-09-05Merge commit '4cb38750d49010ae72e718d46605ac9ba5a851b4' into ↵Konrad Rzeszutek Wilk
stable/for-linus-3.6 * commit '4cb38750d49010ae72e718d46605ac9ba5a851b4': (6849 commits) bcma: fix invalid PMU chip control masks [libata] pata_cmd64x: whitespace cleanup libata-acpi: fix up for acpi_pm_device_sleep_state API sata_dwc_460ex: device tree may specify dma_channel ahci, trivial: fixed coding style issues related to braces ahci_platform: add hibernation callbacks libata-eh.c: local functions should not be exposed globally libata-transport.c: local functions should not be exposed globally sata_dwc_460ex: support hardreset ata: use module_pci_driver drivers/ata/pata_pcmcia.c: adjust suspicious bit operation pata_imx: Convert to clk_prepare_enable/clk_disable_unprepare ahci: Enable SB600 64bit DMA on MSI K9AGM2 (MS-7327) v2 [libata] Prevent interface errors with Seagate FreeAgent GoFlex drivers/acpi/glue: revert accidental license-related 6b66d95895c bits libata-acpi: add missing inlines in libata.h i2c-omap: Add support for I2C_M_STOP message flag i2c: Fall back to emulated SMBus if the operation isn't supported natively i2c: Add SCCB support i2c-tiny-usb: Add support for the Robofuzz OSIF USB/I2C converter ...
2012-09-05xen/p2m: Fix one-off error in checking the P2M tree directory.Konrad Rzeszutek Wilk
We would traverse the full P2M top directory (from 0->MAX_DOMAIN_PAGES inclusive) when trying to figure out whether we can re-use some of the P2M middle leafs. Which meant that if the kernel was compiled with MAX_DOMAIN_PAGES=512 we would try to use the 512th entry. Fortunately for us the p2m_top_index has a check for this: BUG_ON(pfn >= MAX_P2M_PFN); which we hit and saw this: (XEN) domain_crash_sync called from entry.S (XEN) Domain 0 (vcpu#0) crashed on cpu#0: (XEN) ----[ Xen-4.1.2-OVM x86_64 debug=n Tainted: C ]---- (XEN) CPU: 0 (XEN) RIP: e033:[<ffffffff819cadeb>] (XEN) RFLAGS: 0000000000000212 EM: 1 CONTEXT: pv guest (XEN) rax: ffffffff81db5000 rbx: ffffffff81db4000 rcx: 0000000000000000 (XEN) rdx: 0000000000480211 rsi: 0000000000000000 rdi: ffffffff81db4000 (XEN) rbp: ffffffff81793db8 rsp: ffffffff81793d38 r8: 0000000008000000 (XEN) r9: 4000000000000000 r10: 0000000000000000 r11: ffffffff81db7000 (XEN) r12: 0000000000000ff8 r13: ffffffff81df1ff8 r14: ffffffff81db6000 (XEN) r15: 0000000000000ff8 cr0: 000000008005003b cr4: 00000000000026f0 (XEN) cr3: 0000000661795000 cr2: 0000000000000000 Fixes-Oracle-Bug: 14570662 CC: stable@vger.kernel.org # only for v3.5 Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-09-05KVM: SVM: constify lookup tablesMathias Krause
We never modify direct_access_msrs[], msrpm_ranges[], svm_exit_handlers[] or x86_intercept_map[] at runtime. Mark them r/o. Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05KVM: VMX: constify lookup tablesMathias Krause
We use vmcs_field_to_offset_table[], kvm_vmx_segment_fields[] and kvm_vmx_exit_handlers[] as lookup tables only -- make them r/o. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05KVM: x86: more constificationMathias Krause
Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05KVM: x86: constify read_write_emulator_opsMathias Krause
We never change those, make them r/o. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05KVM: x86 emulator: constify emulate_opsMathias Krause
We never change emulate_ops[] at runtime so it should be r/o. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05KVM: x86 emulator: mark opcode tables constMathias Krause
The opcode tables never change at runtime, therefor mark them const. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05KVM: x86 emulator: use aligned variants of SSE register opsMathias Krause
As the the compiler ensures that the memory operand is always aligned to a 16 byte memory location, use the aligned variant of MOVDQ for read_sse_reg() and write_sse_reg(). Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05KVM: x86: minor size optimizationMathias Krause
Some fields can be constified and/or made static to reduce code and data size. Numbers for a 32 bit build: text data bss dec hex filename before: 3351 80 0 3431 d67 cpuid.o after: 3391 0 0 3391 d3f cpuid.o Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-05x86/kconfig: Remove outdated reference to Intel CPUs in CONFIG_SWIOTLBJoe Millenbach
Deleted the no longer valid example of which x86 CPUs lack a hardware IOMMU, and moved the "If unsure..." statement to a new line to follow the style of surrounding options. Signed-off-by: Joe Millenbach <jmillenbach@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Cc: team-fjord@googlegroups.com Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Link: http://lkml.kernel.org/r/1346632700-29113-1-git-send-email-jmillenbach@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/iommu: Use NULL instead of plain 0 for __IOMMU_INITMathias Krause
IOMMU_INIT_POST and IOMMU_INIT_POST_FINISH pass the plain value 0 instead of NULL to __IOMMU_INIT. Fix this and make sparse happy by doing so. Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Joerg Roedel <joerg.roedel@amd.com> Link: http://lkml.kernel.org/r/1346621506-30857-8-git-send-email-minipli@googlemail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/iommu: Drop duplicate const in __IOMMU_INITMathias Krause
It's redundant and makes sparse complain about it. Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Joerg Roedel <joerg.roedel@amd.com> Link: http://lkml.kernel.org/r/1346621506-30857-7-git-send-email-minipli@googlemail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/fpu/xsave: Keep __user annotation in castsMathias Krause
Don't remove the __user annotation of the fpstate pointer, but drop the superfluous void * cast instead. This fixes the following sparse warnings: xsave.c:135:15: warning: cast removes address space of expression xsave.c:135:15: warning: incorrect type in argument 1 (different address spaces) xsave.c:135:15: expected void const volatile [noderef] <asn:1>*<noident> [...] Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1346621506-30857-6-git-send-email-minipli@googlemail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/pci/probe_roms: Add missing __iomem annotation to pci_map_biosrom()Mathias Krause
Stay in sync with the declaration and fix the corresponding sparse warnings. Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Dan Williams <dan.j.williams@intel.com> Link: http://lkml.kernel.org/r/1346621506-30857-5-git-send-email-minipli@googlemail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/signals: ia32_signal.c: add __user casts to fix sparse warningsMathias Krause
Fix the following sparse warnings by adding appropriate __user casts and annotations: ia32_signal.c:165:38: warning: incorrect type in argument 1 (different address spaces) ia32_signal.c:165:38: expected struct sigaltstack const [noderef] [usertype] <asn:1>*<noident> ia32_signal.c:165:38: got struct sigaltstack * [...] Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Oleg Nesterov <oleg@redhat.com> Link: http://lkml.kernel.org/r/1346621506-30857-4-git-send-email-minipli@googlemail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/vdso: Add __user annotation to VDSO32_SYMBOLMathias Krause
The address calculated by VDSO32_SYMBOL() is a pointer into userland. Add the __user annotation to fix related sparse warnings in its users. Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Andy Lutomirski <luto@MIT.EDU> Link: http://lkml.kernel.org/r/1346621506-30857-3-git-send-email-minipli@googlemail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86: Fix __user annotations in asm/sys_ia32.hMathias Krause
Fix the following sparse warnings: sys_ia32.c:293:38: warning: incorrect type in argument 2 (different address spaces) sys_ia32.c:293:38: expected unsigned int [noderef] [usertype] <asn:1>*stat_addr sys_ia32.c:293:38: got unsigned int *stat_addr Ironically, sys_ia32.h was introduced to fix sparse warnings but missed that one. Signed-off-by: Mathias Krause <minipli@googlemail.com> Link: http://lkml.kernel.org/r/1346621506-30857-2-git-send-email-minipli@googlemail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/Kconfig: Turn off DEBUG_NX_TEST module in defconfigsJosh Triplett
The x86 defconfigs include exactly one module: test_nx.ko, a special-purpose module which just exists to do evil things like executing code off the stack to see if the kernel has enabled NX support. Anyone who actually uses that module can easily enable it themselves, but the vast majority of kernel builds don't need it; disable it by default. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Arjan van de Ven <arjan@linux.intel.com> Link: http://lkml.kernel.org/r/e72faf875e1172fb1cbec5e6d3cd4122df508a97.1346649518.git.josh@joshtriplett.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/Kconfig: Turn off CONFIG_BLK_DEV_RAMJosh Triplett
The vast majority of systems either use initramfs or mount a root filesystem directly from the kernel. Distros have defaulted to initramfs for years. Only highly specialized systems would use an actual filesystem-image initrd at this point, and such systems don't rely on defconfig anyway. Drop initrd support (and specifically RAM block device support) from the defconfigs. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/2521e983a63595cd7a331236d929577660f89c72.1346649518.git.josh@joshtriplett.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/Kconfig: Disable CONFIG_CRC_T10DIF in defconfigsJosh Triplett
CONFIG_CRC_T10DIF explicitly states that it exists only for use by out-of-tree modules; anything in-kernel that needs it selects it. Thus, compile it out by default. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/3aaff7a0af1320427952d411a21b8ded29747a1f.1346649518.git.josh@joshtriplett.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/Kconfig: Switch to ext4 in defconfigsJosh Triplett
The current x86 and x86-64 defconfigs do not enable ext4, which most current distributions default to. Switch the defconfigs to ext4, so they will boot on current systems without additional configuration. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/bd8a359506b7e1287c680823de16d67608ec52fe.1346649518.git.josh@joshtriplett.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-05x86/Kconfig: Update defconfigs to current results of "make savedefconfig"Josh Triplett
The x86 defconfigs have become somewhat out of date compared to the current result of "make savedefconfig". Update them to the current output, as a prelude to further defconfig changes, to avoid unrelated noise in those further changes. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/80c8a5fbeaf6cdb72fb78a016013427efee52668.1346649518.git.josh@joshtriplett.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-04perf/x86: Enable Intel Cedarview Atom suppportStephane Eranian
This patch enables perf_events support for Intel Cedarview Atom (model 54) processors. Support includes PEBS and LBR. Tested on my Atom N2600 netbook. Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20120820092421.GA11284@quad Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-04KVM: PIC: fix use of uninitialised variable.Jamie Iles
Commit aea218f3cbbc (KVM: PIC: call ack notifiers for irqs that are dropped form irr) used an uninitialised variable to track whether an appropriate apic had been found. This could result in calling the ack notifier incorrectly. Cc: Gleb Natapov <gleb@redhat.com> Cc: Avi Kivity <avi@redhat.com> Signed-off-by: Jamie Iles <jamie@jamieiles.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-04KVM: cleanup pic resetGleb Natapov
kvm_pic_reset() is not used anywhere. Move reset logic from pic_ioport_write() there. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-09-01hpet: Remove unused PCI Vendor ID #defineJon Mason
HPET_ID_VENDOR_8086 is defined but never used. It would be a redefine of PCI_VENDOR_ID_INTEL if it was ever used. Signed-off-by: Jon Mason <jdmason@kudzu.us> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2012-08-30KVM: x86: remove unused variable from kvm_task_switch()Marcelo Tosatti
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-28Merge branch 'perf/urgent' into perf/coreIngo Molnar
Pick up the latest fixes because upcoming uprobes changes will rely on it. Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-08-27KVM: VMX: Ignore segment G and D bits when considering whether we can virtualizeAvi Kivity
We will enter the guest with G and D cleared; as real hardware ignores D in real mode, and G is taken care of by the limit test, we allow more code to run in vm86 mode. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-27KVM: VMX: Save all segment data in real modeAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-27KVM: VMX: Preserve segment limit and access rights in real modeAvi Kivity
While this is undocumented, real processors do not reload the segment limit and access rights when loading a segment register in real mode. Real programs rely on it so we need to comply with this behaviour. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-27KVM: VMX: Return real real-mode segment data even if ↵Avi Kivity
emulate_invalid_guest_state=1 emulate_invalid_guest_state=1 doesn't mean we don't munge the segments in the vmcs; we do. So we need to return the real ones (maintained by vmx_set_segment). Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-27KVM: x86 emulator: Fix #GP error code during linearizationAvi Kivity
We want the segment selector, nor segment number. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-27KVM: x86 emulator: Check segment limits in real mode tooAvi Kivity
Segment limits are verified in real mode, not just protected mode. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-27KVM: x86 emulator: Leave segment limit and attributs alone in real modeAvi Kivity
When loading a segment in real mode, only the base and selector must be modified. The limit needs to be left alone, otherwise big real mode users will hit a #GP due to limit checking (currently this is suppressed because we don't check limits in real mode). Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-27KVM: VMX: Allow vm86 virtualization of big real modeAvi Kivity
Usually, big real mode uses large (4GB) segments. Currently we don't virtualize this; if any segment has a limit other than 0xffff, we emulate. But if we set the vmx-visible limit to 0xffff, we can use vm86 to virtualize real mode; if an access overruns the segment limit, the guest will #GP, which we will trap and forward to the emulator. This results in significantly faster execution, and less risk of hitting an unemulated instruction. If the limit is less than 0xffff, we retain the existing behaviour. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-08-27KVM: VMX: Allow real mode emulation using vm86 with dpl=0Avi Kivity
Real mode is always entered from protected mode with dpl=0. Since the dpl doesn't affect execution, and we already override it to 3 in the vmcs (as vmx requires), we can allow execution in that state. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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