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2010-10-24KVM: MMU: introduce hva_to_pfn_atomic functionXiao Guangrong1-11/+19
Introduce hva_to_pfn_atomic(), it's the fast path and can used in atomic context, the later patch will use it Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24KVM: x86: Add clock sync request to hardware enableZachary Amsden1-1/+5
If there are active VCPUs which are marked as belonging to a particular hardware CPU, request a clock sync for them when enabling hardware; the TSC could be desynchronized on a newly arriving CPU, and we need to recompute guests system time relative to boot after a suspend event. This covers both cases. Note that it is acceptable to take the spinlock, as either no other tasks will be running and no locks held (BSP after resume), or other tasks will be guaranteed to drop the lock relatively quickly (AP on CPU_STARTING). Noting we now get clock synchronization requests for VCPUs which are starting up (or restarting), it is tempting to attempt to remove the arch/x86/kvm/x86.c CPU hot-notifiers at this time, however it is not correct to do so; they are required for systems with non-constant TSC as the frequency may not be known immediately after the processor has started until the cpufreq driver has had a chance to run and query the chipset. Updated: implement better locking semantics for hardware_enable Removed the hack of dropping and retaking the lock by adding the semantic that we always hold kvm_lock when hardware_enable is called. The one place that doesn't need to worry about it is resume, as resuming a frozen CPU, the spinlock won't be taken. Signed-off-by: Zachary Amsden <zamsden@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-22Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bklLinus Torvalds1-0/+3
* 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl: vfs: make no_llseek the default vfs: don't use BKL in default_llseek llseek: automatically add .llseek fop libfs: use generic_file_llseek for simple_attr mac80211: disallow seeks in minstrel debug code lirc: make chardev nonseekable viotape: use noop_llseek raw: use explicit llseek file operations ibmasmfs: use generic_file_llseek spufs: use llseek in all file operations arm/omap: use generic_file_llseek in iommu_debug lkdtm: use generic_file_llseek in debugfs net/wireless: use generic_file_llseek in debugfs drm: use noop_llseek
2010-10-15llseek: automatically add .llseek fopArnd Bergmann1-0/+3
All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
2010-09-23KVM: Fix reboot on Intel hostsAvi Kivity1-1/+3
When we reboot, we disable vmx extensions or otherwise INIT gets blocked. If a task on another cpu hits a vmx instruction, it will fault if vmx is disabled. We trap that to avoid a nasty oops and spin until the reboot completes. Problem is, we sleep with interrupts disabled. This blocks smp_send_stop() from running, and the reboot process halts. Fix by enabling interrupts before spinning. KVM-Stable-Tag. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-09-23KVM: fix irqfd assign/deassign raceMichael S. Tsirkin1-1/+2
I think I see the following (theoretical) race: During irqfd assign, we drop irqfds lock before we schedule inject work. Therefore, deassign running on another CPU could cause shutdown and flush to run before inject, causing user after free in inject. A simple fix it to schedule inject under the lock. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Gregory Haskins <ghaskins@novell.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-09-09KVM: x86: Perform hardware_enable in CPU_STARTING callbackZachary Amsden1-3/+2
The CPU_STARTING callback was added upstream with the intention of being used for KVM, specifically for the hardware enablement that must be done before we can run in hardware virt. It had bugs on the x86_64 architecture at the time, where it was called after CPU_ONLINE. The arches have since merged and the bug is gone. It might be noted other features should probably start making use of this callback; microcode updates in particular which might be fixing important erratums would be best applied before beginning to run user tasks. Signed-off-by: Zachary Amsden <zamsden@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-02KVM: Convert mask notifiers to use irqchip/pin instead of gsiGleb Natapov2-5/+9
Devices register mask notifier using gsi, but irqchip knows about irqchip/pin, so conversion from irqchip/pin to gsi should be done before looking for mask notifier to call. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-02KVM: Return EFAULT from kvm ioctl when guest accesses bad areaGleb Natapov1-4/+24
Currently if guest access address that belongs to memory slot but is not backed up by page or page is read only KVM treats it like MMIO access. Remove that capability. It was never part of the interface and should not be relied upon. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-02KVM: define hwpoison variables staticGleb Natapov1-2/+2
They are not used outside of the file. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-02KVM: Use u64 for frame data typesJoerg Roedel1-1/+1
For 32bit machines where the physical address width is larger than the virtual address width the frame number types in KVM may overflow. Fix this by changing them to u64. [sfr: fix build on 32-bit ppc] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01KVM: Remove unnecessary divide operationsJoerg Roedel1-5/+5
This patch converts unnecessary divide and modulo operations in the KVM large page related code into logical operations. This allows to convert gfn_t to u64 while not breaking 32 bit builds. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01KVM: Fix IOMMU memslot reference warningSheng Yang1-2/+6
This patch fixes the following warning. =================================================== [ INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- include/linux/kvm_host.h:259 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 no locks held by qemu-system-x86/29679. stack backtrace: Pid: 29679, comm: qemu-system-x86 Not tainted 2.6.35-rc3+ #200 Call Trace: [<ffffffff810a224e>] lockdep_rcu_dereference+0xa8/0xb1 [<ffffffffa018a06f>] kvm_iommu_unmap_memslots+0xc9/0xde [kvm] [<ffffffffa018a0c4>] kvm_iommu_unmap_guest+0x40/0x4e [kvm] [<ffffffffa018f772>] kvm_arch_destroy_vm+0x1a/0x186 [kvm] [<ffffffffa01800d0>] kvm_put_kvm+0x110/0x167 [kvm] [<ffffffffa0180ecc>] kvm_vcpu_release+0x18/0x1c [kvm] [<ffffffff81156f5d>] fput+0x22a/0x3a0 [<ffffffff81152288>] filp_close+0xb4/0xcd [<ffffffff8106599f>] put_files_struct+0x1b7/0x36b [<ffffffff81065830>] ? put_files_struct+0x48/0x36b [<ffffffff8131ee59>] ? do_raw_spin_unlock+0x118/0x160 [<ffffffff81065bc0>] exit_files+0x6d/0x75 [<ffffffff81068348>] do_exit+0x47d/0xc60 [<ffffffff8177e7b5>] ? _raw_spin_unlock_irq+0x30/0x36 [<ffffffff81068bfa>] do_group_exit+0xcf/0x134 [<ffffffff81080790>] get_signal_to_deliver+0x732/0x81d [<ffffffff81095996>] ? cpu_clock+0x4e/0x60 [<ffffffff81002082>] do_notify_resume+0x117/0xc43 [<ffffffff810a2fa3>] ? trace_hardirqs_on+0xd/0xf [<ffffffff81080d79>] ? sys_rt_sigtimedwait+0x2b5/0x3bf [<ffffffff8177d9f2>] ? trace_hardirqs_off_thunk+0x3a/0x3c [<ffffffff81003221>] ? sysret_signal+0x5/0x3d [<ffffffff8100343b>] int_signal+0x12/0x17 Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01KVM: Fix a race condition for usage of is_hwpoison_address()Huang Ying1-1/+2
is_hwpoison_address accesses the page table, so the caller must hold current->mm->mmap_sem in read mode. So fix its usage in hva_to_pfn of kvm accordingly. Comment is_hwpoison_address to remind other users. Reported-by: Avi Kivity <avi@redhat.com> Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: Keep slot ID in memory slot structureAvi Kivity1-0/+1
May be used for distinguishing between internal and user slots, or for sorting slots in size order. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: Add mini-API for vcpu->requestsAvi Kivity1-2/+2
Makes it a little more readable and hackable. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: Remove memory alias supportAvi Kivity1-14/+4
As advertised in feature-removal-schedule.txt. Equivalent support is provided by overlapping memory regions. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: x86: In DM_LOWEST, only deliver interrupts to vcpus with enabled LAPIC'sChris Lalancette1-1/+1
Otherwise we might try to deliver a timer interrupt to a cpu that can't possibly handle it. Signed-off-by: Chris Lalancette <clalance@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01KVM: Fix unused but set warningsAndi Kleen1-2/+0
No real bugs in this one. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: Fix KVM_SET_SIGNAL_MASK with arg == NULLAndi Kleen1-1/+1
When the user passed in a NULL mask pass this on from the ioctl handler. Found by gcc 4.6's new warnings. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: cleanup "*new.rmap" typeLai Jiangshan1-1/+1
The type of '*new.rmap' is not 'struct page *', fix it Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01KVM: Update Red Hat copyrightsAvi Kivity7-1/+8
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: Consolidate arch specific vcpu ioctl lockingAvi Kivity1-2/+0
Now that all arch specific ioctls have centralized locking, it is easy to move it to the central dispatcher. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: move vcpu locking to dispatcher for generic vcpu ioctlsAvi Kivity1-0/+15
All vcpu ioctls need to be locked, so instead of locking each one specifically we lock at the generic dispatcher. This patch only updates generic ioctls and leaves arch specific ioctls alone. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01KVM: remove CAP_SYS_RAWIO requirement from kvm_vm_ioctl_assign_irqAlex Williamson1-3/+0
Remove this check in an effort to allow kvm guests to run without root privileges. This capability check doesn't seem to add any security since the device needs to have already been added via the assign device ioctl and the io actually occurs through the pci sysfs interface. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01KVM: Avoid killing userspace through guest SRAO MCE on unmapped pagesHuang Ying1-2/+28
In common cases, guest SRAO MCE will cause corresponding poisoned page be un-mapped and SIGBUS be sent to QEMU-KVM, then QEMU-KVM will relay the MCE to guest OS. But it is reported that if the poisoned page is accessed in guest after unmapping and before MCE is relayed to guest OS, userspace will be killed. The reason is as follows. Because poisoned page has been un-mapped, guest access will cause guest exit and kvm_mmu_page_fault will be called. kvm_mmu_page_fault can not get the poisoned page for fault address, so kernel and user space MMIO processing is tried in turn. In user MMIO processing, poisoned page is accessed again, then userspace is killed by force_sig_info. To fix the bug, kvm_mmu_page_fault send HWPOISON signal to QEMU-KVM and do not try kernel and user space MMIO processing for poisoned page. [xiao: fix warning introduced by avi] Reported-by: Max Asbock <masbock@linux.vnet.ibm.com> Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-06-10KVM: read apic->irr with ioapic lock heldMarcelo Tosatti1-1/+2
Read ioapic->irr inside ioapic->lock protected section. KVM-Stable-Tag Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-09KVM: Fix order passed to iommu_unmapJan Kiszka1-1/+1
This is obviously a left-over from the the old interface taking the size. Apparently a mostly harmless issue with the current iommu_unmap implementation. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Acked-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-21Merge branch 'kvm-updates/2.6.35' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds4-38/+43
* 'kvm-updates/2.6.35' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (269 commits) KVM: x86: Add missing locking to arch specific vcpu ioctls KVM: PPC: Add missing vcpu_load()/vcpu_put() in vcpu ioctls KVM: MMU: Segregate shadow pages with different cr0.wp KVM: x86: Check LMA bit before set_efer KVM: Don't allow lmsw to clear cr0.pe KVM: Add cpuid.txt file KVM: x86: Tell the guest we'll warn it about tsc stability x86, paravirt: don't compute pvclock adjustments if we trust the tsc x86: KVM guest: Try using new kvm clock msrs KVM: x86: export paravirtual cpuid flags in KVM_GET_SUPPORTED_CPUID KVM: x86: add new KVMCLOCK cpuid feature KVM: x86: change msr numbers for kvmclock x86, paravirt: Add a global synchronization point for pvclock x86, paravirt: Enable pvclock flags in vcpu_time_info structure KVM: x86: Inject #GP with the right rip on efer writes KVM: SVM: Don't allow nested guest to VMMCALL into host KVM: x86: Fix exception reinjection forced to true KVM: Fix wallclock version writing race KVM: MMU: Don't read pdptrs with mmu spinlock held in mmu_alloc_roots KVM: VMX: enable VMXON check with SMX enabled (Intel TXT) ...
2010-05-19KVM: Let vcpu structure alignment be determined at runtimeAvi Kivity1-3/+4
vmx and svm vcpus have different contents and therefore may have different alignmment requirements. Let each specify its required alignment. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-18Merge branch 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tipLinus Torvalds1-22/+91
* 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86/amd-iommu: Add amd_iommu=off command line option iommu-api: Remove iommu_{un}map_range functions x86/amd-iommu: Implement ->{un}map callbacks for iommu-api x86/amd-iommu: Make amd_iommu_iova_to_phys aware of multiple page sizes x86/amd-iommu: Make iommu_unmap_page and fetch_pte aware of page sizes x86/amd-iommu: Make iommu_map_page and alloc_pte aware of page sizes kvm: Change kvm_iommu_map_pages to map large pages VT-d: Change {un}map_range functions to implement {un}map interface iommu-api: Add ->{un}map callbacks to iommu_ops iommu-api: Add iommu_map and iommu_unmap functions iommu-api: Rename ->{un}map function pointers to ->{un}map_range
2010-05-17KVM: Remove test-before-set optimization for dirty bitsTakuya Yoshikawa1-3/+1
As Avi pointed out, testing bit part in mark_page_dirty() was important in the days of shadow paging, but currently EPT and NPT has already become common and the chance of faulting a page more that once per iteration is small. So let's remove the test bit to avoid extra access. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-17KVM: do not call hardware_disable() on CPU_UP_CANCELEDLai Jiangshan1-5/+0
When CPU_UP_CANCELED, hardware_enable() has not been called at the CPU which is going up because raw_notifier_call_chain(CPU_ONLINE) has not been called for this cpu. Drop the handling for CPU_UP_CANCELED. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-17KVM: use the correct RCU API for PROVE_RCU=yLai Jiangshan2-7/+10
The RCU/SRCU API have already changed for proving RCU usage. I got the following dmesg when PROVE_RCU=y because we used incorrect API. This patch coverts rcu_deference() to srcu_dereference() or family API. =================================================== [ INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- arch/x86/kvm/mmu.c:3020 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 2 locks held by qemu-system-x86/8550: #0: (&kvm->slots_lock){+.+.+.}, at: [<ffffffffa011a6ac>] kvm_set_memory_region+0x29/0x50 [kvm] #1: (&(&kvm->mmu_lock)->rlock){+.+...}, at: [<ffffffffa012262d>] kvm_arch_commit_memory_region+0xa6/0xe2 [kvm] stack backtrace: Pid: 8550, comm: qemu-system-x86 Not tainted 2.6.34-rc4-tip-01028-g939eab1 #27 Call Trace: [<ffffffff8106c59e>] lockdep_rcu_dereference+0xaa/0xb3 [<ffffffffa012f6c1>] kvm_mmu_calculate_mmu_pages+0x44/0x7d [kvm] [<ffffffffa012263e>] kvm_arch_commit_memory_region+0xb7/0xe2 [kvm] [<ffffffffa011a5d7>] __kvm_set_memory_region+0x636/0x6e2 [kvm] [<ffffffffa011a6ba>] kvm_set_memory_region+0x37/0x50 [kvm] [<ffffffffa015e956>] vmx_set_tss_addr+0x46/0x5a [kvm_intel] [<ffffffffa0126592>] kvm_arch_vm_ioctl+0x17a/0xcf8 [kvm] [<ffffffff810a8692>] ? unlock_page+0x27/0x2c [<ffffffff810bf879>] ? __do_fault+0x3a9/0x3e1 [<ffffffffa011b12f>] kvm_vm_ioctl+0x364/0x38d [kvm] [<ffffffff81060cfa>] ? up_read+0x23/0x3d [<ffffffff810f3587>] vfs_ioctl+0x32/0xa6 [<ffffffff810f3b19>] do_vfs_ioctl+0x495/0x4db [<ffffffff810e6b2f>] ? fget_light+0xc2/0x241 [<ffffffff810e416c>] ? do_sys_open+0x104/0x116 [<ffffffff81382d6d>] ? retint_swapgs+0xe/0x13 [<ffffffff810f3ba6>] sys_ioctl+0x47/0x6a [<ffffffff810021db>] system_call_fastpath+0x16/0x1b Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-17KVM: limit the number of pages per memory slotTakuya Yoshikawa1-5/+6
This patch limits the number of pages per memory slot to make us free from extra care about type issues. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17KVM: coalesced_mmio: fix kvm_coalesced_mmio_init()'s error handlingTakuya Yoshikawa2-4/+10
kvm_coalesced_mmio_init() keeps to hold the addresses of a coalesced mmio ring page and dev even after it has freed them. Also, if this function fails, though it might be rare, it seems to be suggesting the system's serious state: so we'd better stop the works following the kvm_creat_vm(). This patch clears these problems. We move the coalesced mmio's initialization out of kvm_create_vm(). This seems to be natural because it includes a registration which can be done only when vm is successfully created. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17KVM: fix assigned_device_enable_host_msix error handlingjing zhang1-2/+6
Free IRQ's and disable MSIX upon failure. Cc: Avi Kivity <avi@redhat.com> Signed-off-by: Jing Zhang <zj.barak@gmail.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17KVM: fix the errno of ioctl KVM_[UN]REGISTER_COALESCED_MMIO failureWei Yongjun2-4/+2
This patch change the errno of ioctl KVM_[UN]REGISTER_COALESCED_MMIO from -EINVAL to -ENXIO if no coalesced mmio dev exists. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17KVM: cleanup kvm traceXiao Guangrong1-1/+0
This patch does: - no need call tracepoint_synchronize_unregister() when kvm module is unloaded since ftrace can handle it - cleanup ftrace's macro Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-13KVM: convert ioapic lock to spinlockMarcelo Tosatti2-16/+16
kvm_set_irq is used from non sleepable contexes, so convert ioapic from mutex to spinlock. KVM-Stable-Tag. Tested-by: Ralf Bonenkamp <ralf.bonenkamp@swyx.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-11Merge branch 'iommu/largepages' into amd-iommu/2.6.35Joerg Roedel1-22/+91
Conflicts: arch/x86/kernel/amd_iommu.c
2010-04-25KVM: update gfn_to_hva() to use gfn_to_hva_memslot()Takuya Yoshikawa1-6/+6
Marcelo introduced gfn_to_hva_memslot() when he implemented gfn_to_pfn_memslot(). Let's use this for gfn_to_hva() too. Note: also remove parentheses next to return as checkpatch said to do. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-21KVM: Add missing srcu_read_lock() for kvm_mmu_notifier_release()Lai Jiangshan1-0/+4
I got this dmesg due to srcu_read_lock() is missing in kvm_mmu_notifier_release(). =================================================== [ INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- arch/x86/kvm/x86.h:72 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 2 locks held by qemu-system-x86/3100: #0: (rcu_read_lock){.+.+..}, at: [<ffffffff810d73dc>] __mmu_notifier_release+0x38/0xdf #1: (&(&kvm->mmu_lock)->rlock){+.+...}, at: [<ffffffffa0130a6a>] kvm_mmu_zap_all+0x21/0x5e [kvm] stack backtrace: Pid: 3100, comm: qemu-system-x86 Not tainted 2.6.34-rc3-22949-gbc8a97a-dirty #2 Call Trace: [<ffffffff8106afd9>] lockdep_rcu_dereference+0xaa/0xb3 [<ffffffffa0123a89>] unalias_gfn+0x56/0xab [kvm] [<ffffffffa0119600>] gfn_to_memslot+0x16/0x25 [kvm] [<ffffffffa012ffca>] gfn_to_rmap+0x17/0x6e [kvm] [<ffffffffa01300c1>] rmap_remove+0xa0/0x19d [kvm] [<ffffffffa0130649>] kvm_mmu_zap_page+0x109/0x34d [kvm] [<ffffffffa0130a7e>] kvm_mmu_zap_all+0x35/0x5e [kvm] [<ffffffffa0122870>] kvm_arch_flush_shadow+0x16/0x22 [kvm] [<ffffffffa01189e0>] kvm_mmu_notifier_release+0x15/0x17 [kvm] [<ffffffff810d742c>] __mmu_notifier_release+0x88/0xdf [<ffffffff810d73dc>] ? __mmu_notifier_release+0x38/0xdf [<ffffffff81040848>] ? exit_mm+0xe0/0x115 [<ffffffff810c2cb0>] exit_mmap+0x2c/0x17e [<ffffffff8103c472>] mmput+0x2d/0xd4 [<ffffffff81040870>] exit_mm+0x108/0x115 [...] Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-20KVM: fix the handling of dirty bitmaps to avoid overflowsTakuya Yoshikawa1-5/+8
Int is not long enough to store the size of a dirty bitmap. This patch fixes this problem with the introduction of a wrapper function to calculate the sizes of dirty bitmaps. Note: in mark_page_dirty(), we have to consider the fact that __set_bit() takes the offset as int, not long. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-03-30include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.hTejun Heo6-1/+6
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-07kvm: Change kvm_iommu_map_pages to map large pagesJoerg Roedel1-22/+91
This patch changes the implementation of of kvm_iommu_map_pages to map the pages with the host page size into the io virtual address space. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Acked-By: Avi Kivity <avi@redhat.com>
2010-03-01KVM: Convert kvm->requests_lock to raw_spinlock_tAvi Kivity1-3/+3
The code relies on kvm->requests_lock inhibiting preemption. Noted by Jan Kiszka. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01KVM: do not store wqh in irqfdMichael S. Tsirkin1-3/+0
wqh is unused, so we do not need to store it in irqfd anymore Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01KVM: cleanup the failure path of KVM_CREATE_IRQCHIP ioctrlWei Yongjun2-0/+12
If we fail to init ioapic device or the fail to setup the default irq routing, the device register by kvm_create_pic() and kvm_ioapic_init() remain unregister. This patch fixed to do this. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01KVM: kvm->arch.vioapic should be NULL if kvm_ioapic_init() failureWei Yongjun1-1/+3
kvm->arch.vioapic should be NULL in case of kvm_ioapic_init() failure due to cannot register io dev. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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