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2008-05-18KVM: Fix kvm_vcpu_block() task state raceMarcelo Tosatti1-14/+15
There's still a race in kvm_vcpu_block(), if a wake_up_interruptible() call happens before the task state is set to TASK_INTERRUPTIBLE: CPU0 CPU1 kvm_vcpu_block add_wait_queue kvm_cpu_has_interrupt = 0 set interrupt if (waitqueue_active()) wake_up_interruptible() kvm_cpu_has_pending_timer kvm_arch_vcpu_runnable signal_pending set_current_state(TASK_INTERRUPTIBLE) schedule() Can be fixed by using prepare_to_wait() which sets the task state before testing for the wait condition. Signed-off-by: Marcelo Tosatti <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-05-04KVM: Export necessary function for EPTSheng Yang1-0/+1
Signed-off-by: Sheng Yang <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-05-01[PATCH] sanitize anon_inode_getfd()Al Viro1-16/+5
a) none of the callers even looks at inode or file returned by anon_inode_getfd() b) any caller that would try to look at those would be racy, since by the time it returns we might have raced with close() from another thread and that file would be pining for fjords. Signed-off-by: Al Viro <[email protected]>
2008-04-27KVM: kill file->f_count abuse in kvmAl Viro1-6/+6
Use kvm own refcounting instead of playing with ->filp->f_count. That will allow to get rid of a lot of crap in anon_inode_getfd() and kill a race in kvm_dev_ioctl_create_vm() (file might have been closed immediately by another thread, so ->filp might point to already freed struct file when we get around to setting it). Signed-off-by: Al Viro <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: Rename debugfs_dir to kvm_debugfs_dirHollis Blanchard2-6/+6
It's a globally exported symbol now. Signed-off-by: Hollis Blanchard <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: add ioctls to save/store mpstateMarcelo Tosatti1-0/+24
So userspace can save/restore the mpstate during migration. [avi: export the #define constants describing the value] [christian: add s390 stubs] [avi: ditto for ia64] Signed-off-by: Marcelo Tosatti <[email protected]> Signed-off-by: Christian Borntraeger <[email protected]> Signed-off-by: Carsten Otte <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: hlt emulation should take in-kernel APIC/PIT timers into accountMarcelo Tosatti1-0/+1
Timers that fire between guest hlt and vcpu_block's add_wait_queue() are ignored, possibly resulting in hangs. Also make sure that atomic_inc and waitqueue_active tests happen in the specified order, otherwise the following race is open: CPU0 CPU1 if (waitqueue_active(wq)) add_wait_queue() if (!atomic_read(pit_timer->pending)) schedule() atomic_inc(pit_timer->pending) Signed-off-by: Marcelo Tosatti <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: Add kvm trace userspace interfaceFeng(Eric) Liu2-1/+283
This interface allows user a space application to read the trace of kvm related events through relayfs. Signed-off-by: Feng (Eric) Liu <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: MMU: Don't assume struct page for x86Anthony Liguori1-7/+61
This patch introduces a gfn_to_pfn() function and corresponding functions like kvm_release_pfn_dirty(). Using these new functions, we can modify the x86 MMU to no longer assume that it can always get a struct page for any given gfn. We don't want to eliminate gfn_to_page() entirely because a number of places assume they can do gfn_to_page() and then kmap() the results. When we support IO memory, gfn_to_page() will fail for IO pages although gfn_to_pfn() will succeed. This does not implement support for avoiding reference counting for reserved RAM or for IO memory. However, it should make those things pretty straight forward. Since we're only introducing new common symbols, I don't think it will break the non-x86 architectures but I haven't tested those. I've tested Intel, AMD, NPT, and hugetlbfs with Windows and Linux guests. [avi: fix overflow when shifting left pfns by adding casts] Signed-off-by: Anthony Liguori <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: add vm refcountingIzik Eidus1-1/+16
the main purpose of adding this functions is the abilaty to release the spinlock that protect the kvm list while still be able to do operations on a specific kvm in a safe way. Signed-off-by: Izik Eidus <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: Use kzalloc to avoid allocating kvm_regs from kernel stackXiantao Zhang1-11/+22
Since the size of kvm_regs is too big to allocate from kernel stack on ia64, use kzalloc to allocate it. Signed-off-by: Xiantao Zhang <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: MMU: large page supportMarcelo Tosatti1-1/+24
Create large pages mappings if the guest PTE's are marked as such and the underlying memory is hugetlbfs backed. If the largepage contains write-protected pages, a large pte is not used. Gives a consistent 2% improvement for data copies on ram mounted filesystem, without NPT/EPT. Anthony measures a 4% improvement on 4-way kernbench, with NPT. Signed-off-by: Marcelo Tosatti <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: MMU: ignore zapped root pagetablesMarcelo Tosatti1-0/+23
Mark zapped root pagetables as invalid and ignore such pages during lookup. This is a problem with the cr3-target feature, where a zapped root table fools the faulting code into creating a read-only mapping. The result is a lockup if the instruction can't be emulated. Signed-off-by: Marcelo Tosatti <[email protected]> Cc: Anthony Liguori <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: Disable pagefaults during copy_from_user_inatomic()Andrea Arcangeli1-0/+2
With CONFIG_PREEMPT=n, this is needed in order to disable the fault-in code from sleeping. Signed-off-by: Andrea Arcangeli <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: Limit vcpu mmap size to one page on non-x86Avi Kivity1-1/+4
The second page is only needed on archs that support pio. Noted by Carsten Otte. Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: Only x86 has pioAvi Kivity1-0/+2
Signed-off-by: Avi Kivity <[email protected]>
2008-04-27KVM: constify function pointer tablesJan Engelhardt1-2/+2
Signed-off-by: Jan Engelhardt <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-03-04KVM: Route irq 0 to vcpu 0 exclusivelyAvi Kivity1-0/+8
Some Linux versions allow the timer interrupt to be processed by more than one cpu, leading to hangs due to tsc instability. Work around the issue by only disaptching the interrupt to vcpu 0. Problem analyzed (and patch tested) by Sheng Yang. Signed-off-by: Avi Kivity <[email protected]>
2008-03-04KVM: remove the usage of the mmap_sem for the protection of the memory slots.Izik Eidus1-2/+3
This patch replaces the mmap_sem lock for the memory slots with a new kvm private lock, it is needed beacuse untill now there were cases where kvm accesses user memory while holding the mmap semaphore. Signed-off-by: Izik Eidus <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-02-08libfs: allow error return from simple attributesChristoph Hellwig1-8/+8
Sometimes simple attributes might need to return an error, e.g. for acquiring a mutex interruptibly. In fact we have that situation in spufs already which is the original user of the simple attributes. This patch merged the temporarily forked attributes in spufs back into the main ones and allows to return errors. [[email protected]: build fix] Signed-off-by: Christoph Hellwig <[email protected]> Cc: <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Greg KH <[email protected]> Cc: Al Viro <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2008-01-30KVM: MMU: Switch to mmu spinlockMarcelo Tosatti1-2/+1
Convert the synchronization of the shadow handling to a separate mmu_lock spinlock. Also guard fetch() by mmap_sem in read-mode to protect against alias and memslot changes. Signed-off-by: Marcelo Tosatti <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-01-30KVM: Add kvm_read_guest_atomic()Marcelo Tosatti1-0/+20
In preparation for a mmu spinlock, add kvm_read_guest_atomic() and use it in fetch() and prefetch_page(). Signed-off-by: Marcelo Tosatti <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-01-30KVM: MMU: Concurrent guest walkersMarcelo Tosatti1-17/+5
Do not hold kvm->lock mutex across the entire pagefault code, only acquire it in places where it is necessary, such as mmu hash list, active list, rmap and parent pte handling. Allow concurrent guest walkers by switching walk_addr() to use mmap_sem in read-mode. And get rid of the lockless __gfn_to_page. [avi: move kvm_mmu_pte_write() locking inside the function] [avi: add locking for real mode] [avi: fix cmpxchg locking] Signed-off-by: Marcelo Tosatti <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-01-30KVM: Move ioapic code to common directory.Zhang Xiantao2-0/+498
Move ioapic code to common, since IA64 also needs it. Signed-off-by: Zhang Xiantao <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
2008-01-30KVM: Move drivers/kvm/* to virt/kvm/Avi Kivity2-0/+1456
Signed-off-by: Avi Kivity <[email protected]>
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