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2008-10-15KVM: VMX: Modify mode switching and vmentry functionsMohammed Gamal
This patch modifies mode switching and vmentry function in order to drive invalid guest state emulation. Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Add invalid guest state handlerMohammed Gamal
This adds the invalid guest state handler function which invokes the x86 emulator until getting the guest to a VMX-friendly state. [avi: leave atomic context if scheduling] [guillaume: return to atomic context correctly] Signed-off-by: Laurent Vivier <laurent.vivier@bull.net> Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net> Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Add module parameter and emulation flag.Mohammed Gamal
The patch adds the module parameter required to enable emulating invalid guest state, as well as the emulation_required flag used to drive emulation whenever needed. Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Add Guest State Validity ChecksMohammed Gamal
This patch adds functions to check whether guest state is VMX compliant. Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Device assignment: Check for privileges before assigning irqAmit Shah
Even though we don't share irqs at the moment, we should ensure regular user processes don't try to allocate system resources. We check for capability to access IO devices (CAP_SYS_RAWIO) before we request_irq on behalf of the guest. Noticed by Avi. Signed-off-by: Amit Shah <amit.shah@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Handle spurious acks for PIT interruptsAvi Kivity
Spurious acks can be generated, for example if the PIC is being reset. Handle those acks gracefully rather than flooding the log with warnings. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: fix i8259 reset irq ackingMarcelo Tosatti
The irq ack during pic reset has three problems: - Ignores slave/master PIC, using gsi 0-8 for both. - Generates an ACK even if the APIC is in control. - Depends upon IMR being clear, which is broken if the irq was masked at the time it was generated. The last one causes the BIOS to hang after the first reboot of Windows installation, since PIT interrupts stop. [avi: fix check whether pic interrupts are seen by cpu] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Use interrupt queue for !irqchip_in_kernelAvi Kivity
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: set debug registers after "schedulable" sectionMarcelo Tosatti
The vcpu thread can be preempted after the guest_debug_pre() callback, resulting in invalid debug registers on the new vcpu. Move it inside the non-preemptable section. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Clean up magic number 0x66 in init_rmode_tssSheng Yang
Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Reduce stack usage in kvm_pv_mmu_op()Dave Hansen
We're in a hot path. We can't use kmalloc() because it might impact performance. So, we just stick the buffer that we need into the kvm_vcpu_arch structure. This is used very often, so it is not really a waste. We also have to move the buffer structure's definition to the arch-specific x86 kvm header. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Reduce stack usage in kvm_arch_vcpu_ioctl()Dave Hansen
[sheng: fix KVM_GET_LAPIC using wrong size] Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Reduce kvm stack usage in kvm_arch_vm_ioctl()Dave Hansen
On my machine with gcc 3.4, kvm uses ~2k of stack in a few select functions. This is mostly because gcc fails to notice that the different case: statements could have their stack usage combined. It overflows very nicely if interrupts happen during one of these large uses. This patch uses two methods for reducing stack usage. 1. dynamically allocate large objects instead of putting on the stack. 2. Use a union{} member for all of the case variables. This tricks gcc into combining them all into a single stack allocation. (There's also a comment on this) Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: pci device assignmentBen-Ami Yassour
Based on a patch from: Amit Shah <amit.shah@qumranet.com> This patch adds support for handling PCI devices that are assigned to the guest. The device to be assigned to the guest is registered in the host kernel and interrupt delivery is handled. If a device is already assigned, or the device driver for it is still loaded on the host, the device assignment is failed by conveying a -EBUSY reply to the userspace. Devices that share their interrupt line are not supported at the moment. By itself, this patch will not make devices work within the guest. The VT-d extension is required to enable the device to perform DMA. Another alternative is PVDMA. Signed-off-by: Amit Shah <amit.shah@qumranet.com> Signed-off-by: Ben-Ami Yassour <benami@il.ibm.com> Signed-off-by: Weidong Han <weidong.han@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15x86: KVM guest: use paravirt function to calculate cpu khzGlauber Costa
We're currently facing timing problems in guests that do calibration under heavy load, and then the load vanishes. This means we'll have a much lower lpj than we actually should, and delays end up taking less time than they should, which is a nasty bug. Solution is to pass on the lpj value from host to guest, and have it preset. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15x86: paravirt: factor out cpu_khz to common codeGlauber Costa
KVM intends to use paravirt code to calibrate khz. Xen current code will do just fine. So as a first step, factor out code to pvclock.c. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: PIT: fix injection logic and countMarcelo Tosatti
The PIT injection logic is problematic under the following cases: 1) If there is a higher priority vector to be delivered by the time kvm_pit_timer_intr_post is invoked ps->inject_pending won't be set. This opens the possibility for missing many PIT event injections (say if guest executes hlt at this point). 2) ps->inject_pending is racy with more than two vcpus. Since there's no locking around read/dec of pt->pending, two vcpu's can inject two interrupts for a single pt->pending count. Fix 1 by using an irq ack notifier: only reinject when the previous irq has been acked. Fix 2 with appropriate locking around manipulation of pending count and irq_ack by the injection / ack paths. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: irq ack notificationMarcelo Tosatti
Based on a patch from: Ben-Ami Yassour <benami@il.ibm.com> which was based on a patch from: Amit Shah <amit.shah@qumranet.com> Notify IRQ acking on PIC/APIC emulation. The previous patch missed two things: - Edge triggered interrupts on IOAPIC - PIC reset with IRR/ISR set should be equivalent to ack (LAPIC probably needs something similar). Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> CC: Amit Shah <amit.shah@qumranet.com> CC: Ben-Ami Yassour <benami@il.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Add irq ack notifier listAvi Kivity
This can be used by kvm subsystems that are interested in when interrupts are acked, for example time drift compensation. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: powerpc: Map guest userspace with TID=0 mappingsHollis Blanchard
When we use TID=N userspace mappings, we must ensure that kernel mappings have been destroyed when entering userspace. Using TID=1/TID=0 for kernel/user mappings and running userspace with PID=0 means that userspace can't access the kernel mappings, but the kernel can directly access userspace. The net is that we don't need to flush the TLB on privilege switches, but we do on guest context switches (which are far more infrequent). Guest boot time performance improvement: about 30%. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: ppc: Write only modified shadow entries into the TLB on exitHollis Blanchard
Track which TLB entries need to be written, instead of overwriting everything below the high water mark. Typically only a single guest TLB entry will be modified in a single exit. Guest boot time performance improvement: about 15%. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: ppc: Stop saving host TLB stateHollis Blanchard
We're saving the host TLB state to memory on every exit, but never using it. Originally I had thought that we'd want to restore host TLB for heavyweight exits, but that could actually hurt when context switching to an unrelated host process (i.e. not qemu). Since this decreases the performance penalty of all exits, this patch improves guest boot time by about 15%. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: ppc: guest breakpoint supportHollis Blanchard
Allow host userspace to program hardware debug registers to set breakpoints inside guests. Signed-off-by: Jerone Young <jyoung5@us.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Ignore DEBUGCTL MSRs with no effectAlexander Graf
Netware writes to DEBUGCTL and reads from the DEBUGCTL and LAST*IP MSRs without further checks and is really confused to receive a #GP during that. To make it happy we should just make them stubs, which is exactly what SVM already does. Writes to DEBUGCTL that are vendor-specific are resembled to behave as if the virtual CPU does not know them. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Avoid vmwrite(HOST_RSP) when possibleAvi Kivity
Usually HOST_RSP retains its value across guest entries. Take advantage of this and avoid a vmwrite() when this is so. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: ppc: trace powerpc instruction emulationChristian Ehrhardt
This patch adds a trace point for the instruction emulation on embedded powerpc utilizing the KVM_TRACE interface. Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: ppc: adds trace points for ppc tlb activityJerone Young
This patch adds trace points to track powerpc TLB activities using the KVM_TRACE infrastructure. Signed-off-by: Jerone Young <jyoung5@us.ibm.com> Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: ppc: enable KVM_TRACE building for powerpcJerone Young
This patch enables KVM_TRACE to build for PowerPC arch. This means just adding sections to Kconfig and Makefile. Signed-off-by: Jerone Young <jyoung5@us.ibm.com> Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: SVM: Unify register save/restore across 32 and 64 bit hostsAvi Kivity
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Unify register save/restore across 32 and 64 bit hostsAvi Kivity
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Reinject real mode exceptionJan Kiszka
As we execute real mode guests in VM86 mode, exception have to be reinjected appropriately when the guest triggered them. For this purpose the patch adopts the real-mode injection pattern used in vmx_inject_irq to vmx_queue_exception, additionally taking care that the IP is set correctly for #BP exceptions. Furthermore it extends handle_rmode_exception to reinject all those exceptions that can be raised in real mode. This fixes the execution of himem.exe from FreeDOS and also makes its debug.com work properly. Note that guest debugging in real mode is broken now. This has to be fixed by the scheduled debugging infrastructure rework (will be done once base patches for QEMU have been accepted). Signed-off-by: Jan Kiszka <jan.kiszka@web.de> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Consolidate XX_VECTOR definesJan Kiszka
Signed-off-by: Jan Kiszka <jan.kiszka@web.de> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Consolidate PIC isr clearing into a functionAvi Kivity
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Remove redundant check in handle_rmode_exceptionMohammed Gamal
Since checking for vcpu->arch.rmode.active is already done whenever we call handle_rmode_exception(), checking it inside the function is redundant. Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Move interrupt post-processing to vmx_complete_interrupts()Avi Kivity
Instead of looking at failed injections in the vm entry path, move processing to the exit path in vmx_complete_interrupts(). This simplifes the logic and removes any state that is hidden in vmx registers. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Add a pending interrupt queueAvi Kivity
Similar to the exception queue, this hold interrupts that have been accepted by the virtual processor core but not yet injected. Not yet used. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Fix pending exception processingAvi Kivity
The vmx code assumes that IDT-Vectoring can only be set when an exception is injected due to the exception in question. That's not true, however: if the exception is injected correctly, and later another exception occurs but its delivery is blocked due to a fault, then we will incorrectly assume the first exception was not delivered. Fix by unconditionally dequeuing the pending exception, and requeuing it (or the second exception) if we see it in the IDT-Vectoring field. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Clear exception queue before emulating an instructionAvi Kivity
If we're emulating an instruction, either it will succeed, in which case any previously queued exception will be spurious, or we will requeue the same exception. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Move nmi injection failure processing to vm exit pathAvi Kivity
Instead of processing nmi injection failure in the vm entry path, move it to the vm exit path (vm_complete_interrupts()). This separates nmi injection from nmi post-processing, and moves the nmi state from the VT state into vcpu state (new variable nmi_injected specifying an injection in progress). Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Move NMI IRET fault processing to new vmx_complete_interrupts()Avi Kivity
Currently most interrupt exit processing is handled on the entry path, which is confusing. Move the NMI IRET fault processing to a new function, vmx_complete_interrupts(), which is called on the vmexit path. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: MMU: Simplify kvm_mmu_zap_page()Avi Kivity
The twisty maze of conditionals can be reduced. [joerg: fix tlb flushing] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: MMU: Separate the code for unlinking a shadow page from its parentsAvi Kivity
Place into own function, in preparation for further cleanups. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: Introduce kvm_set_irq to inject interrupts in guestsAmit Shah
This function injects an interrupt into the guest given the kvm struct, the (guest) irq number and the interrupt level. Signed-off-by: Amit Shah <amit.shah@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: x86: accessors for guest registersMarcelo Tosatti
As suggested by Avi, introduce accessors to read/write guest registers. This simplifies the ->cache_regs/->decache_regs interface, and improves register caching which is important for VMX, where the cost of vmcs_read/vmcs_write is significant. [avi: fix warnings] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-15KVM: VMX: Rename misnamed msr bitsSheng Yang
MSR_IA32_FEATURE_LOCKED is just a bit in fact, which shouldn't be prefixed with MSR_. So is MSR_IA32_FEATURE_VMXON_ENABLED. Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-10-14Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6Linus Torvalds
* 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6: i2c-viapro: Add support for SMBus Process Call transactions i2c: Restore i2c_smbus_process_call function i2c: Do earlier driver model init i2c: Only build Tyan SMBus mux drivers on x86 i2c: Guard against oopses from bad init sequences i2c: Document the implementation details of the /dev interface i2c: Improve dev-interface documentation i2c-parport-light: Don't register a platform device resource hwmon: (dme1737) Convert to a new-style i2c driver hwmon: (dme1737) Be less i2c-centric i2c/tps65010: Vibrator hookup to gpiolib i2c-viapro: Add VX800/VX820 support i2c: Renesas Highlander FPGA SMBus support i2c-pca-isa: Don't grab arbitrary resources i2c/isp1301_omap: Convert to a new-style i2c driver, part 2 i2c/isp1301_omap: Convert to a new-style i2c driver, part 1
2008-10-14x86: register a platform RTC device if PNP doesn't describe itBjorn Helgaas
Most if not all x86 platforms have an RTC device, but sometimes the RTC is not exposed as a PNP0b00/PNP0b01/PNP0b02 device in PNPBIOS or ACPI: http://bugzilla.kernel.org/show_bug.cgi?id=11580 https://bugzilla.redhat.com/show_bug.cgi?id=451188 It's best if we can discover the RTC via PNP because then we know which flavor of device it is, where it lives, and which IRQ it uses. But if we can't, we should register a platform device using the compiled-in RTC_PORT/RTC_IRQ resource assumptions. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Reported-by: Rik Theys <rik.theys@esat.kuleuven.be> Reported-by: shr_msn@yahoo.com.tw Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-14arch/m68k/mm/kmap.c: introduce missing kfreeJulia Lawall
Error handling code following a kmalloc should free the allocated data. The semantic match that finds the problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @r exists@ local idexpression x; statement S; expression E; identifier f,l; position p1,p2; expression *ptr != NULL; @@ ( if ((x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...)) == NULL) S | x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...); .. if (x == NULL) S ) <... when != x when != if (...) { <+...x...+> } x->f = E ..> ( return \(0\|<+...x...+>\|ptr\); | return@p2 ...; ) @script:python@ p1 << r.p1; p2 << r.p2; @@ print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-14m68k: init_irq_proc depends on CONFIG_PROC_FSGeert Uytterhoeven
If CONFIG_PROC_FS is not set, I get: | arch/m68k/kernel/ints.c:433: error: redefinition of 'init_irq_proc' | include/linux/interrupt.h:438: error: previous definition of 'init_irq_proc' was here This was introduced by commit 6168a702ab0be181e5e57a0b2d0e7376f7a47f0b ("Declare init_irq_proc before we use it."), which replaced the #ifdef protection of the init_irq_proc() call by a static inline dummy if CONFIG_PROC_FS is not set. Make init_irq_proc() depend on CONFIG_PROC_FS to fix this. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-14m68k: remove the dead PCI codeAdrian Bunk
This patch removes the no longer used m68k PCI code. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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