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2009-09-10KVM: make io_bus interface more robustGregory Haskins
Today kvm_io_bus_regsiter_dev() returns void and will internally BUG_ON if it fails. We want to create dynamic MMIO/PIO entries driven from userspace later in the series, so we need to enhance the code to be more robust with the following changes: 1) Add a return value to the registration function 2) Fix up all the callsites to check the return code, handle any failures, and percolate the error up to the caller. 3) Add an unregister function that collapses holes in the array Signed-off-by: Gregory Haskins <ghaskins@novell.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: add module parameters documentationAndre Przywara
Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: PIT support for HPET legacy modeBeth Kon
When kvm is in hpet_legacy_mode, the hpet is providing the timer interrupt and the pit should not be. So in legacy mode, the pit timer is destroyed, but the *state* of the pit is maintained. So if kvm or the guest tries to modify the state of the pit, this modification is accepted, *except* that the timer isn't actually started. When we exit hpet_legacy_mode, the current state of the pit (which is up to date since we've been accepting modifications) is used to restart the pit timer. The saved_mode code in kvm_pit_load_count temporarily changes mode to 0xff in order to destroy the timer, but then restores the actual value, again maintaining "current" state of the pit for possible later reenablement. [avi: add some reserved storage in the ioctl; make SET_PIT2 IOW] [marcelo: fix memory corruption due to reserved storage] Signed-off-by: Beth Kon <eak@us.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Always report x2apic as supported featureGleb Natapov
We emulate x2apic in software, so host support is not required. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: No need to kick cpu if not in a guest modeGleb Natapov
This will save a couple of IPIs. Signed-off-by: Gleb Natapov <gleb@redhat.com> Acked-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Add trace points in irqchip codeGleb Natapov
Add tracepoint in msi/ioapic/pic set_irq() functions, in IPI sending and in the point where IRQ is placed into apic's IRR. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: ignore msi request if !levelMichael S. Tsirkin
Irqfd sets level for interrupt to 1 and then to 0. For MSI, check level so that a single message is sent. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: fix MMIO_CONF_BASE MSR accessAndre Przywara
Some Windows versions check whether the BIOS has setup MMI/O for config space accesses on AMD Fam10h CPUs, we say "no" by returning 0 on reads and only allow disabling of MMI/O CfgSpace setup by igoring "0" writes. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Trace shadow page lifecycleAvi Kivity
Create, sync, unsync, zap. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Document basic APIAvi Kivity
Document the basic API corresponding to the 2.6.22 release. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: MMU: Trace guest pagetable walkerAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10Revert "KVM: x86: check for cr3 validity in ioctl_set_sregs"Jan Kiszka
This reverts commit 6c20e1442bb1c62914bb85b7f4a38973d2a423ba. To my understanding, it became obsolete with the advent of the more robust check in mmu_alloc_roots (89da4ff17f). Moreover, it prevents the conceptually safe pattern 1. set sregs 2. register mem-slots 3. run vcpu by setting a sticky triple fault during step 1. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: handle AMD microcode MSRAndre Przywara
Windows 7 tries to update the CPU's microcode on some processors, so we ignore the MSR write here. The patchlevel register is already handled (returning 0), because the MSR number is the same as Intel's. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Fix apic_mmio_write return for unaligned writeSheng Yang
Some in-famous OS do unaligned writing for APIC MMIO, and the return value has been missed in recent change, then the OS hangs. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Use temporary variable to shorten lines.Gleb Natapov
Cosmetic only. No logic is changed by this patch. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x2apic interface to lapicGleb Natapov
This patch implements MSR interface to local apic as defines by x2apic Intel specification. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Add Directed EOI support to APIC emulationGleb Natapov
Directed EOI is specified by x2APIC, but is available even when lapic is in xAPIC mode. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Trace apic registers using their symbolic namesAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Trace mmioAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Ignore PCI ECS I/O enablementAndre Przywara
Linux guests will try to enable access to the extended PCI config space via the I/O ports 0xCF8/0xCFC on AMD Fam10h CPU. Since we (currently?) don't use ECS, simply ignore write and read attempts. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Trace irq level and source idAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: fix lock imbalanceJiri Slaby
There is a missing unlock on one fail path in ioapic_mmio_write, fix that. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: document lock nesting ruleMichael S. Tsirkin
Document kvm->lock nesting within kvm->slots_lock Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: remove in_range from io devicesMichael S. Tsirkin
This changes bus accesses to use high-level kvm_io_bus_read/kvm_io_bus_write functions. in_range now becomes unused so it is removed from device ops in favor of read/write callbacks performing range checks internally. This allows aliasing (mostly for in-kernel virtio), as well as better error handling by making it possible to pass errors up to userspace. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: convert bus to slots_lockMichael S. Tsirkin
Use slots_lock to protect device list on the bus. slots_lock is already taken for read everywhere, so we only need to take it for write when registering devices. This is in preparation to removing in_range and kvm->lock around it. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: switch pit creation to slots_lockMichael S. Tsirkin
switch pit creation to slots_lock. slots_lock is already taken for read everywhere, so we only need to take it for write when creating pit. This is in preparation to removing in_range and kvm->lock around it. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: switch coalesced mmio changes to slots_lockMichael S. Tsirkin
switch coalesced mmio slots_lock. slots_lock is already taken for read everywhere, so we only need to take it for write when changing zones. This is in preparation to removing in_range and kvm->lock around it. [avi: fix build] Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: document locking for kvm_io_device_opsMichael S. Tsirkin
slots_lock is taken everywhere when device ops are called. Document this as we will use this to rework locking for io. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: use vcpu_id instead of bsp_vcpu pointer in kvm_vcpu_is_bspMarcelo Tosatti
Change kvm_vcpu_is_bsp to use vcpu_id instead of bsp_vcpu pointer, which is only initialized at the end of kvm_vm_ioctl_create_vcpu. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: remove old KVMTRACE support codeMarcelo Tosatti
Return EOPNOTSUPP for KVM_TRACE_ENABLE/PAUSE/DISABLE ioctls. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: powerpc: convert marker probes to event traceMarcelo Tosatti
[avi: make it build] [avi: fold trace-arch.h into trace.h] CC: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: introduce module parameter for ignoring unknown MSRs accessesAndre Przywara
KVM will inject a #GP into the guest if that tries to access unhandled MSRs. This will crash many guests. Although it would be the correct way to actually handle these MSRs, we introduce a runtime switchable module param called "ignore_msrs" (defaults to 0). If this is Y, unknown MSR reads will return 0, while MSR writes are simply dropped. In both cases we print a message to dmesg to inform the user about that. You can change the behaviour at any time by saying: # echo 1 > /sys/modules/kvm/parameters/ignore_msrs Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: ignore reads from AMDs C1E enabled MSRAndre Przywara
If the Linux kernel detects an C1E capable AMD processor (K8 RevF and higher), it will access a certain MSR on every attempt to go to halt. Explicitly handle this read and return 0 to let KVM run a Linux guest with the native AMD host CPU propagated to the guest. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: ignore AMDs HWCR register access to set the FFDIS bitAndre Przywara
Linux tries to disable the flush filter on all AMD K8 CPUs. Since KVM does not handle the needed MSR, the injected #GP will panic the Linux kernel. Ignore setting of the HWCR.FFDIS bit in this MSR to let Linux boot with an AMD K8 family guest CPU. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x86: missing locking in PIT/IRQCHIP/SET_BSP_CPU ioctl pathsMarcelo Tosatti
Correct missing locking in a few places in x86's vm_ioctl handling path. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Prepare memslot data structures for multiple hugepage sizesJoerg Roedel
[avi: fix build on non-x86] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10hugetlbfs: export vma_kernel_pagsize to modulesJoerg Roedel
This function is required by KVM. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: s390: Fix memslot initialization for userspace_addr != 0Christian Borntraeger
Since commit 854b5338196b1175706e99d63be43a4f8d8ab607 Author: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> KVM: s390: streamline memslot handling s390 uses the values of the memslot instead of doing everything in the arch ioctl handler of the KVM_SET_USER_MEMORY_REGION. Unfortunately we missed to set the userspace_addr of our memslot due to our s390 ifdef in __kvm_set_memory_region. Old s390 userspace launchers did not notice, since they started the guest at userspace address 0. Because of CONFIG_DEFAULT_MMAP_MIN_ADDR we now put the guest at 1M userspace, which does not work. This patch makes sure that new.userspace_addr is set on s390. This fix should go in quickly. Nevertheless, looking at the code we should clean up that ifdef in the long term. Any kernel janitors? Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x86 emulator: Add sysexit emulationAndre Przywara
Handle #UD intercept of the sysexit instruction in 64bit mode returning to 32bit compat mode on an AMD host. Setup the segment descriptors for CS and SS and the EIP/ESP registers according to the manual. Signed-off-by: Christoph Egger <christoph.egger@amd.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x86 emulator: Add sysenter emulationAndre Przywara
Handle #UD intercept of the sysenter instruction in 32bit compat mode on an AMD host. Setup the segment descriptors for CS and SS and the EIP/ESP registers according to the manual. Signed-off-by: Christoph Egger <christoph.egger@amd.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x86 emulator: add syscall emulationAndre Przywara
Handle #UD intercept of the syscall instruction in 32bit compat mode on an Intel host. Setup the segment descriptors for CS and SS and the EIP/ESP registers according to the manual. Save the RIP and EFLAGS to the correct registers. [avi: fix build on i386 due to missing R11] Signed-off-by: Christoph Egger <christoph.egger@amd.com> Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x86 emulator: Prepare for emulation of syscall instructionsAndre Przywara
Add the flags needed for syscall, sysenter and sysexit to the opcode table. Catch (but for now ignore) the opcodes in the emulation switch/case. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Christoph Egger <christoph.egger@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x86 emulator: Add missing EFLAGS bit definitionsAndre Przywara
Signed-off-by: Christoph Egger <christoph.egger@amd.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Allow emulation of syscalls instructions on #UDAndre Przywara
Add the opcodes for syscall, sysenter and sysexit to the list of instructions handled by the undefined opcode handler. Signed-off-by: Christoph Egger <christoph.egger@amd.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: convert custom marker based tracing to event tracesMarcelo Tosatti
This allows use of the powerful ftrace infrastructure. See Documentation/trace/ for usage information. [avi, stephen: various build fixes] [sheng: fix control register breakage] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: SVM: Improve nested interrupt injectionAlexander Graf
While trying to get Hyper-V running, I realized that the interrupt injection mechanisms that are in place right now are not 100% correct. This patch makes nested SVM's interrupt injection behave more like on a real machine. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: SVM: Implement INVLPGAAlexander Graf
SVM adds another way to do INVLPG by ASID which Hyper-V makes use of, so let's implement it! For now we just do the same thing invlpg does, as asid switching means we flush the mmu anyways. That might change one day though. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Implement MSRs used by Hyper-VAlexander Graf
Hyper-V uses some MSRs, some of which are actually reserved for BIOS usage. But let's be nice today and have it its way, because otherwise it fails terribly. [jaswinder: fix build for linux-next changes] Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10x86: Add definition for IGNNE MSRAlexander Graf
Hyper-V accesses MSR_IGNNE while running under KVM. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: SVM: Don't save/restore host cr2Avi Kivity
The host never reads cr2 in process context, so are free to clobber it. The vmx code does this, so we can safely remove the save/restore code. Signed-off-by: Avi Kivity <avi@redhat.com>
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