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2008-12-31x86: disable VMX on all CPUs on rebootEduardo Habkost1-2/+60
On emergency_restart, we may need to use an NMI to disable virtualization on all CPUs. We do that using nmi_shootdown_cpus() if VMX is enabled. Note: With this patch, we will run the NMI stuff only when the CPU where emergency_restart() was called has VMX enabled. This should work on most cases because KVM enables VMX on all CPUs, but we may miss the small window where KVM is doing that. Also, I don't know if all code using VMX out there always enable VMX on all CPUs like KVM does. We have two other alternatives for that: a) Have an API that all code that enables VMX on any CPU should use to tell the kernel core that it is going to enable VMX on the CPUs. b) Always call nmi_shootdown_cpus() if the CPU supports VMX. This is a bit intrusive and more risky, as it would run nmi_shootdown_cpus() on emergency_reboot() even on systems where virtualization is never enabled. Finding a proper point to hook the nmi_shootdown_cpus() call isn't trivial, as the non-emergency machine_restart() (that doesn't need the NMI tricks) uses machine_emergency_restart() directly. The solution to make this work without adding a new function or argument to machine_ops was setting a 'reboot_emergency' flag that tells if native_machine_emergency_restart() needs to do the virt cleanup or not. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31kdump: forcibly disable VMX and SVM on machine_crash_shutdown()Eduardo Habkost1-0/+18
We need to disable virtualization extensions on all CPUs before booting the kdump kernel, otherwise the kdump kernel booting will fail, and rebooting after the kdump kernel did its task may also fail. We do it using cpu_emergency_vmxoff() and cpu_emergency_svm_disable(), that should always work, because those functions check if the CPUs support SVM or VMX before doing their tasks. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31x86: cpu_emergency_svm_disable() functionEduardo Habkost1-0/+8
This function can be used by the reboot or kdump code to forcibly disable SVM on the CPU. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: SVM: move svm_hardware_disable() code to asm/virtext.hEduardo Habkost2-5/+15
Create cpu_svm_disable() function. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: SVM: move has_svm() code to asm/virtext.hEduardo Habkost2-14/+46
Use a trick to keep the printk()s on has_svm() working as before. gcc will take care of not generating code for the 'msg' stuff when the function is called with a NULL msg argument. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31x86: cpu_emergency_vmxoff() functionEduardo Habkost1-0/+23
Add cpu_emergency_vmxoff() and its friends: cpu_vmx_enabled() and __cpu_emergency_vmxoff(). Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: VMX: extract kvm_cpu_vmxoff() from hardware_disable()Eduardo Habkost1-2/+11
Along with some comments on why it is different from the core cpu_vmxoff() function. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31x86: asm/virtext.h: add cpu_vmxoff() inline functionEduardo Habkost1-0/+15
Unfortunately we can't use exactly the same code from vmx hardware_disable(), because the KVM function uses the __kvm_handle_fault_on_reboot() tricks. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: VMX: move cpu_has_kvm_support() to an inline on asm/virtext.hEduardo Habkost2-2/+33
It will be used by core code on kdump and reboot, to disable vmx if needed. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: VMX: move ASM_VMX_* definitions from asm/kvm_host.h to asm/vmx.hEduardo Habkost2-12/+15
Those definitions will be used by code outside KVM, so move it outside of a KVM-specific source file. Those definitions are used only on kvm/vmx.c, that already includes asm/vmx.h, so they can be moved safely. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: SVM: move svm.h to include/asmEduardo Habkost2-1/+1
svm.h will be used by core code that is independent of KVM, so I am moving it outside the arch/x86/kvm directory. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: VMX: move vmx.h to include/asmEduardo Habkost3-2/+2
vmx.h will be used by core code that is independent of KVM, so I am moving it outside the arch/x86/kvm directory. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: fix userspace mapping invalidation on context switchHollis Blanchard3-22/+20
We used to defer invalidating userspace TLB entries until jumping out of the kernel. This was causing MMU weirdness most easily triggered by using a pipe in the guest, e.g. "dmesg | tail". I believe the problem was that after the guest kernel changed the PID (part of context switch), the old process's mappings were still present, and so copy_to_user() on the "return to new process" path ended up using stale mappings. Testing with large pages (64K) exposed the problem, probably because with 4K pages, pressure on the TLB faulted all process A's mappings out before the guest kernel could insert any for process B. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: use prefetchable mappings for guest memoryHollis Blanchard1-2/+7
Bare metal Linux on 440 can "overmap" RAM in the kernel linear map, so that it can use large (256MB) mappings even if memory isn't a multiple of 256MB. To prevent the hardware prefetcher from loading from an invalid physical address through that mapping, it's marked Guarded. However, KVM must ensure that all guest mappings are backed by real physical RAM (since a deliberate access through a guarded mapping could still cause a machine check). Accordingly, we don't need to make our mappings guarded, so let's allow prefetching as the designers intended. Curiously this patch didn't affect performance at all on the quick test I tried, but it's clearly the right thing to do anyways and may improve other workloads. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: use MMUCR accessor to obtain TIDHollis Blanchard1-1/+1
We have an accessor; might as well use it. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ia64: Remove some macro definitions in asm-offsets.c.Xiantao Zhang1-10/+1
Use kernel's corresponding macro instead. Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: fix Kconfig constraintsHollis Blanchard1-10/+8
Make sure that CONFIG_KVM cannot be selected without processor support (currently, 440 is the only processor implementation available). Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: Fix cpuid iteration on multiple leaves per eacNitin A Kamble1-1/+2
The code to traverse the cpuid data array list for counting type of leaves is currently broken. This patches fixes the 2 things in it. 1. Set the 1st counting entry's flag KVM_CPUID_FLAG_STATE_READ_NEXT. Without it the code will never find a valid entry. 2. Also the stop condition in the for loop while looking for the next unflaged entry is broken. It needs to stop when it find one matching entry; and in the case of count of 1, it will be the same entry found in this iteration. Signed-Off-By: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: Fix cpuid leaf 0xb loop terminationNitin A Kamble1-1/+1
For cpuid leaf 0xb the bits 8-15 in ECX register define the end of counting leaf. The previous code was using bits 0-7 for this purpose, which is a bug. Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: improve trap emulationHollis Blanchard1-2/+2
set ESR[PTR] when emulating a guest trap. This allows Linux guests to properly handle WARN_ON() (i.e. detect that it's a non-fatal trap). Also remove debugging printk in trap emulation. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: optimize irq delivery pathHollis Blanchard4-156/+140
In kvmppc_deliver_interrupt is just one case left in the switch and it is a rare one (less than 8%) when looking at the exit numbers. Therefore we can at least drop the switch/case and if an if. I inserted an unlikely too, but that's open for discussion. In kvmppc_can_deliver_interrupt all frequent cases are in the default case. I know compilers are smart but we can make it easier for them. By writing down all options and removing the default case combined with the fact that ithe values are constants 0..15 should allow the compiler to write an easy jump table. Modifying kvmppc_can_deliver_interrupt pointed me to the fact that gcc seems to be unable to reduce priority_exception[x] to a build time constant. Therefore I changed the usage of the translation arrays in the interrupt delivery path completely. It is now using priority without translation to irq on the full irq delivery path. To be able to do that ivpr regs are stored by their priority now. Additionally the decision made in kvmppc_can_deliver_interrupt is already sufficient to get the value of interrupt_msr_mask[x]. Therefore we can replace the 16x4byte array used here with a single 4byte variable (might still be one miss, but the chance to find this in cache should be better than the right entry of the whole array). Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: optimize find first bitHollis Blanchard1-1/+1
Since we use a unsigned long here anyway we can use the optimized __ffs. Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: optimize kvm stat handlingHollis Blanchard1-23/+9
Currently we use an unnecessary if&switch to detect some cases. To be honest we don't need the ligh_exits counter anyway, because we can calculate it out of others. Sum_exits can also be calculated, so we can remove that too. MMIO, DCR and INTR can be counted on other places without these additional control structures (The INTR case was never hit anyway). The handling of BOOKE_INTERRUPT_EXTERNAL/BOOKE_INTERRUPT_DECREMENTER is similar, but we can avoid the additional if when copying 3 lines of code. I thought about a goto there to prevent duplicate lines, but rewriting three lines should be better style than a goto cross switch/case statements (its also not enough code to justify a new inline function). Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: fix set regs to take care of msr changeHollis Blanchard1-1/+1
When changing some msr bits e.g. problem state we need to take special care of that. We call the function in our mtmsr emulation (not needed for wrtee[i]), but we don't call kvmppc_set_msr if we change msr via set_regs ioctl. It's a corner case we never hit so far, but I assume it should be kvmppc_set_msr in our arch set regs function (I found it because it is also a corner case when using pv support which would miss the update otherwise). Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: adjust vcpu types to support 64-bit coresHollis Blanchard4-33/+33
However, some of these fields could be split into separate per-core structures in the future. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: create struct kvm_vcpu_44x and introduce container_of() accessorHollis Blanchard9-63/+154
This patch doesn't yet move all 44x-specific data into the new structure, but is the first step down that path. In the future we may also want to create a struct kvm_vcpu_booke. Based on patch from Liu Yu <yu.liu@freescale.com>. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: Move the last bits of 44x code out of booke.cHollis Blanchard3-44/+58
Needed to port to other Book E processors. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: refactor instruction emulation into generic and core-specific piecesHollis Blanchard8-276/+415
Cores provide 3 emulation hooks, implemented for example in the new 4xx_emulate.c: kvmppc_core_emulate_op kvmppc_core_emulate_mtspr kvmppc_core_emulate_mfspr Strictly speaking the last two aren't necessary, but provide for more informative error reporting ("unknown SPR"). Long term I'd like to have instruction decoding autogenerated from tables of opcodes, and that way we could aggregate universal, Book E, and core-specific instructions more easily and without redundant switch statements. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31ppc: Create disassemble.h to extract instruction fieldsHollis Blanchard2-56/+81
This is used in a couple places in KVM, but isn't KVM-specific. However, this patch doesn't modify other in-kernel emulation code: - xmon uses a direct copy of ppc_opc.c from binutils - emulate_instruction() doesn't need it because it can use a series of mask tests. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: Refactor powerpc.c to relocate 440-specific codeHollis Blanchard9-130/+207
This introduces a set of core-provided hooks. For 440, some of these are implemented by booke.c, with the rest in (the new) 44x.c. Note that these hooks are link-time, not run-time. Since it is not possible to build a single kernel for both e500 and 440 (for example), using function pointers would only add overhead. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: combine booke_guest.c and booke_host.cHollis Blanchard4-89/+66
The division was somewhat artificial and cumbersome, and had no functional benefit anyways: we can only guests built for the real host processor. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: Rename "struct tlbe" to "struct kvmppc_44x_tlbe"Hollis Blanchard6-34/+33
This will ease ports to other cores. Also remove unused "struct kvm_tlb" while we're at it. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ppc: Move 440-specific TLB code into 44x_tlb.cHollis Blanchard4-143/+145
This will make it easier to provide implementations for other cores. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: MMU: Fix aliased gfns treated as unaliasedIzik Eidus2-4/+12
Some areas of kvm x86 mmu are using gfn offset inside a slot without unaliasing the gfn first. This patch makes sure that the gfn will be unaliased and add gfn_to_memslot_unaliased() to save the calculating of the gfn unaliasing in case we have it unaliased already. Signed-off-by: Izik Eidus <ieidus@redhat.com> Acked-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: Enable Function Level Reset for assigned deviceSheng Yang1-1/+1
Ideally, every assigned device should in a clear condition before and after assignment, so that the former state of device won't affect later work. Some devices provide a mechanism named Function Level Reset, which is defined in PCI/PCI-e document. We should execute it before and after device assignment. (But sadly, the feature is new, and most device on the market now don't support it. We are considering using D0/D3hot transmit to emulate it later, but not that elegant and reliable as FLR itself.) [Update: Reminded by Xiantao, execute FLR after we ensure that the device can be assigned to the guest.] Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ia64: Remove lock held by halted vcpuXiantao Zhang1-2/+0
Remove the lock protection for kvm halt logic, otherwise, once other vcpus want to acquire the lock, and they have to wait all vcpus are waken up from halt. Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: ia64: Re-organize data sturure of guests' data areaXiantao Zhang6-107/+161
1. Increase the size of data area to 64M 2. Support more vcpus and memory, 128 vcpus and 256G memory are supported for guests. 3. Add the boundary check for memory and vcpu allocation. With this patch, kvm guest's data area looks as follow: * * +----------------------+ ------- KVM_VM_DATA_SIZE * | vcpu[n]'s data | | ___________________KVM_STK_OFFSET * | | | / | * | .......... | | /vcpu's struct&stack | * | .......... | | /---------------------|---- 0 * | vcpu[5]'s data | | / vpd | * | vcpu[4]'s data | |/-----------------------| * | vcpu[3]'s data | / vtlb | * | vcpu[2]'s data | /|------------------------| * | vcpu[1]'s data |/ | vhpt | * | vcpu[0]'s data |____________________________| * +----------------------+ | * | memory dirty log | | * +----------------------+ | * | vm's data struct | | * +----------------------+ | * | | | * | | | * | | | * | | | * | | | * | | | * | | | * | vm's p2m table | | * | | | * | | | * | | | | * vm's data->| | | | * +----------------------+ ------- 0 * To support large memory, needs to increase the size of p2m. * To support more vcpus, needs to ensure it has enough space to * hold vcpus' data. */ Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: VMX: Handle mmio emulation when guest state is invalidGuillaume Thouvenin1-12/+15
If emulate_invalid_guest_state is enabled, the emulator is called when guest state is invalid. Until now, we reported an mmio failure when emulate_instruction() returned EMULATE_DO_MMIO. This patch adds the case where emulate_instruction() failed and an MMIO emulation is needed. Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: allow emulator to adjust rip for emulated pio instructionsGuillaume Thouvenin4-3/+3
If we call the emulator we shouldn't call skip_emulated_instruction() in the first place, since the emulator already computes the next rip for us. Thus we move ->skip_emulated_instruction() out of kvm_emulate_pio() and into handle_io() (and the svm equivalent). We also replaced "return 0" by "break" in the "do_io:" case because now the shadow register state needs to be committed. Otherwise eip will never be updated. Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: SVM: Set the 'busy' flag of the TR selectorAmit Shah1-0/+7
The busy flag of the TR selector is not set by the hardware. This breaks migration from amd hosts to intel hosts. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: SVM: Set the 'g' bit of the cs selector for cross-vendor migrationAmit Shah1-0/+9
The hardware does not set the 'g' bit of the cs selector and this breaks migration from amd hosts to intel hosts. Set this bit if the segment limit is beyond 1 MB. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: x86: Fix typo in function nameAmit Shah1-5/+5
get_segment_descritptor_dtable() contains an obvious type. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: x86: Optimize NMI watchdog deliveryJan Kiszka3-8/+27
As suggested by Avi, this patch introduces a counter of VCPUs that have LVT0 set to NMI mode. Only if the counter > 0, we push the PIT ticks via all LAPIC LVT0 lines to enable NMI watchdog support. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Acked-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: x86: Fix and refactor NMI watchdog emulationJan Kiszka3-17/+20
This patch refactors the NMI watchdog delivery patch, consolidating tests and providing a proper API for delivering watchdog events. An included micro-optimization is to check only for apic_hw_enabled in kvm_apic_local_deliver (the test for LVT mask is covering the soft-disabled case already). Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Acked-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: x86 emulator: Add decode entries for 0x04 and 0x05 opcodes (add acc, imm)Guillaume Thouvenin1-1/+1
Add decode entries for 0x04 and 0x05 (ADD) opcodes, execution is already implemented. Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: VMX: Move private memory slot positionSheng Yang2-3/+4
PCI device assignment would map guest MMIO spaces as separate slot, so it is possible that the device has more than 2 MMIO spaces and overwrite current private memslot. The patch move private memory slot to the top of userspace visible memory slots. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: MMU: Extend kvm_mmu_page->slot_bitmap sizeSheng Yang2-6/+8
Otherwise set_bit() for private memory slot(above KVM_MEMORY_SLOTS) would corrupted memory in 32bit host. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: Clean up kvm_x86_emulate.hSheng Yang1-7/+3
Remove one left improper comment of removed CR2. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: Enable MTRR for EPTSheng Yang5-5/+27
The effective memory type of EPT is the mixture of MSR_IA32_CR_PAT and memory type field of EPT entry. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2008-12-31KVM: Add local get_mtrr_type() to support MTRRSheng Yang1-0/+104
For EPT memory type support. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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