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* KVM: Unset kvm_arch_ops if arch module loading failedAvi Kivity2007-03-181-1/+3
| | | | | | | Otherwise, the core module thinks the arch module is loaded, and won't let you reload it after you've fixed the bug. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Move kvmfs magic number to <linux/magic.h>Andrew Morton2007-03-041-2/+2
| | | | | | | | Use the standard magic.h for kvmfs. Cc: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Fix bogus failure in kvm.ko module initializationAvi Kivity2007-03-041-1/+1
| | | | | | | | | | | | | | A bogus 'return r' can cause an otherwise successful module load to fail. This both denies users the use of kvm, and it also denies them the use of their machine, as it leaves a filesystem registered with its callbacks pointing into now-freed module memory. Fix by returning a zero like a good module. Thanks to Richard Lucassen <mailinglists@lucassen.org> (?) for reporting the problem and for providing access to a machine which exhibited it. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Remove write access permissions when dirty-page-logging is enabledUri Lublin2007-03-041-0/+2
| | | | | | | | | Enabling dirty page logging is done using KVM_SET_MEMORY_REGION ioctl. If the memory region already exists, we need to remove write accesses, so writes will be caught, and dirty pages will be logged. Signed-off-by: Uri Lublin <uril@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* kvm: move do_remove_write_access() upUri Lublin2007-03-041-7/+7
| | | | | | | To be called from kvm_vm_ioctl_set_memory_region() Signed-off-by: Uri Lublin <uril@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Fix dirty page log bitmap size/access calculationUri Lublin2007-03-041-2/+2
| | | | | | | | Since dirty_bitmap is an unsigned long array, the alignment and size need to take that into account. Signed-off-by: Uri Lublin <uril@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Add missing calls to mark_page_dirty()Uri Lublin2007-03-041-0/+6
| | | | | | | | A few places where we modify guest memory fail to call mark_page_dirty(), causing live migration to fail. This adds the missing calls. Signed-off-by: Uri Lublin <uril@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Per-vcpu inodesAvi Kivity2007-03-041-114/+149
| | | | | | | | | | | | | | | | | | | Allocate a distinct inode for every vcpu in a VM. This has the following benefits: - the filp cachelines are no longer bounced when f_count is incremented on every ioctl() - the API and internal code are distinctly clearer; for example, on the KVM_GET_REGS ioctl, there is no need to copy the vcpu number from userspace and then copy the registers back; the vcpu identity is derived from the fd used to make the call Right now the performance benefits are completely theoretical since (a) we don't support more than one vcpu per VM and (b) virtualization hardware inefficiencies completely everwhelm any cacheline bouncing effects. But both of these will change, and we need to prepare the API today. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Move kvm_vm_ioctl_create_vcpu() aroundAvi Kivity2007-03-041-51/+51
| | | | | | In preparation of some hacking. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Rename some kvm_dev_ioctl_*() functions to kvm_vm_ioctl_*()Avi Kivity2007-03-041-24/+24
| | | | | | | This reflects the changed scope, from device-wide to single vm (previously every device open created a virtual machine). Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Create an inode per virtual machineAvi Kivity2007-03-041-41/+171
| | | | | | | | | | This avoids having filp->f_op and the corresponding inode->i_fop different, which is a little unorthodox. The ioctl list is split into two: global kvm ioctls and per-vm ioctls. A new ioctl, KVM_CREATE_VM, is used to create VMs and return the VM fd. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Add internal filesystem for generating inodesAvi Kivity2007-03-041-1/+32
| | | | | | | The kvmfs inodes will represent virtual machines and vcpus, as necessary, reducing cacheline bouncing due to inodes and filps being shared. Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: More 0 -> NULL conversionsAvi Kivity2007-03-041-2/+2
| | | | Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Wire up hypercall handlers to a central arch-independent locationAvi Kivity2007-03-041-0/+36
| | | | Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: add MSR based hypercall APIIngo Molnar2007-03-041-0/+73
| | | | | | | | This adds a special MSR based hypercall API to KVM. This is to be used by paravirtual kernels and virtual drivers. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Use page_private()/set_page_private() apisMarkus Rechberger2007-03-041-1/+1
| | | | | | | Besides using an established api, this allows using kvm in older kernels. Signed-off-by: Markus Rechberger <markus.rechberger@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: CosmeticsAvi Kivity2007-03-041-13/+8Star
| | | | Signed-off-by: Avi Kivity <avi@qumranet.com>
* KVM: Move virtualization deactivation from CPU_DEAD state to CPU_DOWN_PREPAREJeremy Katz2007-03-041-2/+6
| | | | | | | This gives it more chances of surviving suspend. Signed-off-by: Jeremy Katz <katzj@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* [PATCH] KVM: Host suspend/resume supportAvi Kivity2007-02-121-1/+40
| | | | | | | | | | Add the necessary callbacks to suspend and resume a host running kvm. This is just a repeat of the cpu hotplug/unplug work. Signed-off-by: Avi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] KVM: cpu hotplug supportAvi Kivity2007-02-121-0/+64
| | | | | | | | | | | On hotplug, we execute the hardware extension enable sequence. On unplug, we decache any vcpus that last ran on the exiting cpu, and execute the hardware extension disable sequence. Signed-off-by: Avi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] KVM: Add a global list of all virtual machinesAvi Kivity2007-02-121-1/+10
| | | | | | | | | | | This will allow us to iterate over all vcpus and see which cpus they are running on. [akpm@osdl.org: use standard (ugly) initialisers] Signed-off-by: Avi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] kvm: fix vcpu freeing bugIngo Molnar2007-02-121-1/+3
| | | | | | | | | | | vcpu_load() can return NULL and it sometimes does in failure paths (for example when the userspace ABI version is too old) - causing a preemption count underflow in the ->vcpu_free() later on. So check for NULL. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] kvm: Two-way apic tpr synchronizationDor Laor2007-02-121-0/+3
| | | | | | | | | | | | | | We report the value of cr8 to userspace on an exit. Also let userspace change cr8 when we re-enter the guest. The lets 64-bit guest code maintain the tpr correctly. Thanks for Yaniv Kamay for the idea. Signed-off-by: Dor Laor <dor.laor@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] kvm: NULL noise removalAl Viro2007-02-091-14/+14
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] kvm: __user annotationsAl Viro2007-02-091-17/+18
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] KVM: Emulate IA32_MISC_ENABLE msrAvi Kivity2007-01-261-1/+16
| | | | | | | | This allows netbsd 3.1 i386 to get further along installing. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] KVM: make sure there is a vcpu context loaded when destroying the mmuAvi Kivity2007-01-231-0/+2
| | | | | | | | | This makes the vmwrite errors on vm shutdown go away. Signed-off-by: Avi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] KVM: Make loading cr3 more robustIngo Molnar2007-01-061-1/+13
| | | | | | | | | | Prevent the guest's loading of a corrupt cr3 (pointing at no guest phsyical page) from crashing the host. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Add missing 'break'Avi Kivity2007-01-061-0/+1
| | | | | | Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Initialize vcpu->kvm a little earlierAvi Kivity2007-01-061-1/+1
| | | | | | | | Fixes oops on early close of /dev/kvm. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: Destroy mmu while we still have a vcpu leftAvi Kivity2007-01-061-1/+1
| | | | | | | | | mmu_destroy flushes the guest tlb (indirectly), which needs a valid vcpu. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: Replace atomic allocations by preallocated objectsAvi Kivity2007-01-061-4/+14
| | | | | | | | | | | | | | | | The mmu sometimes needs memory for reverse mapping and parent pte chains. however, we can't allocate from within the mmu because of the atomic context. So, move the allocations to a central place that can be executed before the main mmu machinery, where we can bail out on failure before any damage is done. (error handling is deffered for now, but the basic structure is there) Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: Fix cmpxchg8b emulationAvi Kivity2007-01-061-0/+27
| | | | | | | | | | | | | | cmpxchg8b uses edx:eax as the compare operand, not edi:eax. cmpxchg8b is used by 32-bit pae guests to set page table entries atomically, and this is emulated touching shadowed guest page tables. Also, implement it for 32-bit hosts. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: Remove invlpg interceptionAvi Kivity2007-01-061-4/+0Star
| | | | | | | | | | | Since we write protect shadowed guest page tables, there is no need to trap page invalidations (the guest will always change the mapping before issuing the invlpg instruction). Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: If emulating an instruction fails, try unprotecting the pageAvi Kivity2007-01-061-0/+2
| | | | | | | | | | | A page table may have been recycled into a regular page, and so any instruction can be executed on it. Unprotect the page and let the cpu do its thing. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: Support emulated writes into RAMAvi Kivity2007-01-061-0/+24
| | | | | | | | | | | | | As the mmu write protects guest page table, we emulate those writes. Since they are not mmio, there is no need to go to userspace to perform them. So, perform the writes in the kernel if possible, and notify the mmu about them so it can take the approriate action. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: Use the guest pdptrs instead of mapping cr3 in pae modeAvi Kivity2007-01-061-0/+2
| | | | | | | | | | This lets us not write protect a partial page, and is anyway what a real processor does. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: Load the pae pdptrs on cr3 change like the processor doesAvi Kivity2007-01-061-10/+19
| | | | | | | | | | In pae mode, a load of cr3 loads the four third-level page table entries in addition to cr3 itself. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: MMU: Implement simple reverse mappingAvi Kivity2007-01-061-0/+1
| | | | | | | | | | | | | | | | Keep in each host page frame's page->private a pointer to the shadow pte which maps it. If there are multiple shadow ptes mapping the page, set bit 0 of page->private, and use the rest as a pointer to a linked list of all such mappings. Reverse mappings are needed because we when we cache shadow page tables, we must protect the guest page tables from being modified by the guest, as that would invalidate the cached ptes. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Prevent stale bits in cr0 and cr4Avi Kivity2007-01-061-2/+8
| | | | | | | | | | | | | | | | Hardware virtualization implementations allow the guests to freely change some of the bits in cr0 and cr4, but trap when changing the other bits. This is useful to avoid excessive exits due to changing, for example, the ts flag. It also means the kvm's copy of cr0 and cr4 may be stale with respect to these bits. most of the time this doesn't matter as these bits are not very interesting. Other times, however (for example when returning cr0 to userspace), they are, so get the fresh contents of these bits from the guest by means of a new arch operation. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Improve interrupt responseDor Laor2007-01-061-4/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | The current interrupt injection mechanism might delay an interrupt under the following circumstances: - if injection fails because the guest is not interruptible (rflags.IF clear, or after a 'mov ss' or 'sti' instruction). Userspace can check rflags, but the other cases or not testable under the current API. - if injection fails because of a fault during delivery. This probably never happens under normal guests. - if injection fails due to a physical interrupt causing a vmexit so that it can be handled by the host. In all cases the guest proceeds without processing the interrupt, reducing the interactive feel and interrupt throughput of the guest. This patch fixes the situation by allowing userspace to request an exit when the 'interrupt window' opens, so that it can re-inject the interrupt at the right time. Guest interactivity is very visibly improved. Signed-off-by: Dor Laor <dor.laor@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Recover after an arch module load failureYoshimi Ichiyanagi2007-01-061-4/+4
| | | | | | | | | | | | If we load the wrong arch module, it leaves behind kvm_arch_ops set, which prevents loading of the correct arch module later. Fix be not setting kvm_arch_ops until we're sure it's good. Signed-off-by: Yoshimi Ichiyanagi <ichiyanagi.yoshimi@lab.ntt.co.jp> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] kvm: fix GFP_KERNEL allocation in atomic section in ↵Ingo Molnar2006-12-301-4/+6
| | | | | | | | | | | | | | | | | | kvm_dev_ioctl_create_vcpu() fix an GFP_KERNEL allocation in atomic section: kvm_dev_ioctl_create_vcpu() called kvm_mmu_init(), which calls alloc_pages(), while holding the vcpu. The fix is to set up the MMU state in two phases: kvm_mmu_create() and kvm_mmu_setup(). (NOTE: free_vcpus does an kvm_mmu_destroy() call so there's no need for any extra teardown branch on allocation/init failure here.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Fix oops on oomAvi Kivity2006-12-301-1/+2
| | | | | | | | | | __free_page() doesn't like a NULL argument, so check before calling it. A NULL can only happen if memory is exhausted during allocation of a memory slot. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: More msr miseryAvi Kivity2006-12-301-0/+4
| | | | | | | | | These msrs are referenced by benchmarking software when pretending to be an Intel cpu. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Move common msr handling to arch independent codeAvi Kivity2006-12-301-2/+69
| | | | | | Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Initialize kvm_arch_ops on unloadYoshimi Ichiyanagi2006-12-301-0/+6
| | | | | | | | | | | | | | | | | | | | | | | The latest version of kvm doesn't initialize kvm_arch_ops in kvm_init(), which causes an error with the following sequence. 1. Load the supported arch's module. 2. Load the unsupported arch's module.$B!!(B(loading error) 3. Unload the unsupported arch's module. You'll get the following error message after step 3. "BUG: unable to handle to handle kernel paging request at virtual address xxxxxxxx" The problem here is that the unsupported arch's module overwrites kvm_arch_ops of the supported arch's module at step 2. This patch initializes kvm_arch_ops upon loading architecture specific kvm module, and prevents overwriting kvm_arch_ops when kvm_arch_ops is already set correctly. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Simplify is_long_mode()Avi Kivity2006-12-301-2/+2
| | | | | | | | | | | Instead of doing tricky stuff with the arch dependent virtualization registers, take a peek at the guest's efer. This simlifies some code, and fixes some confusion in the mmu branch. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: API versioningAvi Kivity2006-12-221-0/+3
| | | | | | | | Add compile-time and run-time API versioning. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] KVM: Do not export unsupported msrs to userspaceMichael Riepe2006-12-221-3/+24
| | | | | | | | | | | | Some msrs, such as MSR_STAR, are not available on all processors. Exporting them causes qemu to try to fetch them, which will fail. So, check all msrs for validity at module load time. Signed-off-by: Michael Riepe <michael@mr511.de> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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