- 05 Mar, 2012 34 commits
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Scott Wood authored
This function should be called with interrupts disabled, to avoid a race where an exception is delivered after we check, but the resched kick is received before we disable interrupts (and thus doesn't actually trigger the exit code that would recheck exceptions). booke already does this properly in the lightweight exit case, but not on initial entry. For now, move the call of prepare_to_enter into subarch-specific code so that booke can do the right thing here. Ideally book3s would do the same thing, but I'm having a hard time seeing where it does any interrupt disabling of this sort (plus it has several additional call sites), so I'm deferring the book3s fix to someone more familiar with that code. book3s behavior should be unchanged by this patch. Signed-off-by:
Scott Wood <scottwood@freescale.com> Signed-off-by:
Alexander Graf <agraf@suse.de> Signed-off-by:
Avi Kivity <avi@redhat.com>
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Scott Wood authored
This function also updates paravirt int_pending, so rename it to be more obvious that this is a collection of checks run prior to (re)entering a guest. Signed-off-by:
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Scott Wood authored
Currently we check prior to returning from a lightweight exit, but not prior to initial entry. book3s already does a similar test. Signed-off-by:
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Bharat Bhushan authored
As per specification the decrementer interrupt not happen when DEC is written with 0. Also when DEC is zero, no decrementer running. So we should not start hrtimer for decrementer when DEC = 0. Signed-off-by:
Bharat Bhushan <bharat.bhushan@freescale.com> Signed-off-by:
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Bharat Bhushan authored
kvmppc_emulate_dec() uses dec_nsec of type unsigned long and does below calculation: dec_nsec = vcpu->arch.dec; dec_nsec *= 1000; This will truncate if DEC value "vcpu->arch.dec" is greater than 0xffff_ffff/1000. For example : For tb_ticks_per_usec = 4a, we can not set decrementer more than ~58ms. Signed-off-by:Liu Yu <yu.liu@freescale.com> Signed-off-by:
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Bharat Bhushan authored
The current implementation of mtmsr and mtmsrd are racy in that it does: * check (int_pending == 0) ---> host sets int_pending = 1 <--- * write shared page * done while instead we should check for int_pending after the shared page is written. Signed-off-by:
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Alexander Graf authored
With hugetlbfs support emerging on e500, we should also support KVM backing its guest memory by it. This patch adds support for hugetlbfs into the e500 shadow mmu code. Signed-off-by:
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Scott Wood authored
The hardcoded behavior prevents proper SMP support. user space shall specify the vcpu's PIR as the vcpu id. Signed-off-by:
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Scott Wood authored
It should contain the way, not the absolute TLB0 index. Signed-off-by:
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Scott Wood authored
This implements a shared-memory API for giving host userspace access to the guest's TLB. Signed-off-by:
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Scott Wood authored
Split out the portions of tlbe_priv that should be associated with host entries into tlbe_ref. Base victim selection on the number of hardware entries, not guest entries. For TLB1, where one guest entry can be mapped by multiple host entries, we use the host tlbe_ref for tracking page references. For the guest TLB0 entries, we still track it with gtlb_priv, to avoid having to retranslate if the entry is evicted from the host TLB but not the guest TLB. Signed-off-by:
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Scott Wood authored
The only place it makes sense to call this function already needs to have preemption disabled. Signed-off-by:
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Scott Wood authored
Delay allocation of the shadow pid until we're ready to disable preemption and write the entry. Signed-off-by:
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Christian Borntraeger authored
This patch adds the access registers to the kvm_run structure. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
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Christian Borntraeger authored
This patch adds the general purpose registers to the kvm_run structure. Signed-off-by:
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Christian Borntraeger authored
Add the prefix register to the synced register field in kvm_run. While we need the prefix register most of the time read-only, this patch also adds handling for guest dirtying of the prefix register. Signed-off-by:
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Christian Borntraeger authored
On some cpus the overhead for virtualization instructions is in the same range as a system call. Having to call multiple ioctls to get set registers will make certain userspace handled exits more expensive than necessary. Lets provide a section in kvm_run that works as a shared save area for guest registers. We also provide two 64bit flags fields (architecture specific), that will specify 1. which parts of these fields are valid. 2. which registers were modified by userspace Each bit for these flag fields will define a group of registers (like general purpose) or a single register. Signed-off-by:
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Christian Borntraeger authored
There are several places in the kvm module, which set the prefix register. Since we need to flush the cpu, lets combine this operation into a helper function. This helper will also explicitely mask out the unused bits. Signed-off-by:
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Boris Ostrovsky authored
In some cases guests should not provide workarounds for errata even when the physical processor is affected. For example, because of erratum 400 on family 10h processors a Linux guest will read an MSR (resulting in VMEXIT) before going to idle in order to avoid getting stuck in a non-C0 state. This is not necessary: HLT and IO instructions are intercepted and therefore there is no reason for erratum 400 workaround in the guest. This patch allows us to present a guest with certain errata as fixed, regardless of the state of actual hardware. Signed-off-by:
Boris Ostrovsky <boris.ostrovsky@amd.com> Signed-off-by:
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Davidlohr Bueso authored
We can remove the first ->nx state assignment since it is assigned afterwards anyways. Signed-off-by:
Davidlohr Bueso <dave@gnu.org> Signed-off-by:
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Carsten Otte authored
This patch fixes the return code of kvm_arch_vcpu_ioctl in case of an unkown ioctl number. Signed-off-by:
Carsten Otte <cotte@de.ibm.com> Signed-off-by:
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Carsten Otte authored
This patch announces a new capability KVM_CAP_S390_UCONTROL that indicates that kvm can now support virtual machines that are controlled by userspace. Signed-off-by:
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Carsten Otte authored
This patch fixes definition of the idle_mask and the local_int array in kvm_s390_float_interrupt. Previous definition had 64 cpus max hardcoded instead of using KVM_MAX_VCPUS. Signed-off-by:
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Carsten Otte authored
This patch makes sure user controlled virtual machines do not use a system control area (sca). This is needed in order to create virtual machines with more cpus than the size of the sca [64]. Signed-off-by:
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Carsten Otte authored
This patch allows the user to fault in pages on a virtual cpus address space for user controlled virtual machines. Typically this is superfluous because userspace can just create a mapping and let the kernel's page fault logic take are of it. There is one exception: SIE won't start if the lowcore is not present. Normally the kernel takes care of this [handle_validity() in arch/s390/kvm/intercept.c] but since the kernel does not handle intercepts for user controlled virtual machines, userspace needs to be able to handle this condition. Signed-off-by:
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Carsten Otte authored
This patch disables the in-kernel interrupt stack for KVM virtual machines that are controlled by user. Userspace has to take care of handling interrupts on its own. Signed-off-by:
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Carsten Otte authored
This patch disables in-kernel handling of SIE intercepts for user controlled virtual machines. All intercepts are passed to userspace via KVM_EXIT_SIE exit reason just like SIE intercepts that cannot be handled in-kernel for regular KVM guests. Signed-off-by:
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Carsten Otte authored
This patch exports the s390 SIE hardware control block to userspace via the mapping of the vcpu file descriptor. In order to do so, a new arch callback named kvm_arch_vcpu_fault is introduced for all architectures. It allows to map architecture specific pages. Signed-off-by:
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Carsten Otte authored
This patch introduces a new exit reason in the kvm_run structure named KVM_EXIT_S390_UCONTROL. This exit indicates, that a virtual cpu has regognized a fault on the host page table. The idea is that userspace can handle this fault by mapping memory at the fault location into the cpu's address space and then continue to run the virtual cpu. Signed-off-by:
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Carsten Otte authored
This patch introduces two ioctls for virtual cpus, that are only valid for kernel virtual machines that are controlled by userspace. Each virtual cpu has its individual address space in this mode of operation, and each address space is backed by the gmap implementation just like the address space for regular KVM guests. KVM_S390_UCAS_MAP allows to map a part of the user's virtual address space to the vcpu. Starting offset and length in both the user and the vcpu address space need to be aligned to 1M. KVM_S390_UCAS_UNMAP can be used to unmap a range of memory from a virtual cpu in a similar way. Signed-off-by:
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Carsten Otte authored
This patch introduces a new config option for user controlled kernel virtual machines. It introduces a parameter to KVM_CREATE_VM that allows to set bits that alter the capabilities of the newly created virtual machine. The parameter is passed to kvm_arch_init_vm for all architectures. The only valid modifier bit for now is KVM_VM_S390_UCONTROL. This requires CAP_SYS_ADMIN privileges and creates a user controlled virtual machine on s390 architectures. Signed-off-by:
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Xiao Guangrong authored
get_written_sptes is called twice in kvm_mmu_pte_write, one of them can be removed Signed-off-by:
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by:
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Takuya Yoshikawa authored
Signed-off-by:
Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by:
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Takuya Yoshikawa authored
There is only one user of it and for_each_set_bit() does the same. Signed-off-by:
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- 29 Feb, 2012 2 commits
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git://openrisc.net/jonas/linuxLinus Torvalds authored
Build fixes for 3.3 from Jonas Bonn * tag 'for-3.3' of git://openrisc.net/jonas/linux: openrisc: Fix up audit_syscall_[entry|exit]() usage openrisc: include export.h for EXPORT_SYMBOL
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Randy Dunlap authored
Fix printk format warning (from Linus's suggestion): on i386: fs/ecryptfs/miscdev.c:433:38: warning: format '%lu' expects type 'long unsigned int', but argument 4 has type 'unsigned int' and on x86_64: fs/ecryptfs/miscdev.c:433:38: warning: format '%u' expects type 'unsigned int', but argument 4 has type 'long unsigned int' Signed-off-by:
Randy Dunlap <rdunlap@xenotime.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Tyler Hicks <tyhicks@canonical.com> Cc: Dustin Kirkland <dustin.kirkland@gazzang.com> Cc: ecryptfs@vger.kernel.org Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- 28 Feb, 2012 4 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixesLinus Torvalds authored
* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes: GFS2: Read resource groups on mount GFS2: Ensure rindex is uptodate for fallocate GFS2: Read in rindex if necessary during unlink GFS2: Fix race between lru_list and glock ref count
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git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommuLinus Torvalds authored
IOMMU fixes for Linux 3.3-rc5 All the fixes are for the OMAP IOMMU driver. The first patch is the biggest one. It fixes the calls of the function omap_find_iovm_area() in the omap-iommu-debug module which expects a 'struct device' parameter since commit fabdbca8 instead of an omap_iommu handle. The omap-iommu-debug code still passed the handle to the function which caused a crash. The second patch fixes a NULL pointer dereference in the OMAP code and the third patch makes sure that the omap-iommu is initialized before the omap-isp driver, which relies on the iommu. The last patch is only a workaround until defered probing is implemented. * tag 'iommu-fixes-v3.3-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: ARM: OMAP: make iommu subsys_initcall to fix builtin omap3isp iommu/omap: fix NULL pointer dereference iommu/omap: fix erroneous omap-iommu-debug API calls
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Steven Whitehouse authored
This makes mount take slightly longer, but at the same time, the first write to the filesystem will be faster too. It also means that if there is a problem in the resource index, then we can refuse to mount rather than having to try and report that when the first write occurs. In addition, to avoid recursive locking, we hvae to take account of instances when the rindex glock may already be held when we are trying to update the rbtree of resource groups. Signed-off-by:Steven Whitehouse <swhiteho@redhat.com>
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Bob Peterson authored
This patch fixes a problem whereby gfs2_grow was failing and causing GFS2 to assert. The problem was that when GFS2's fallocate operation tried to acquire an "allocation" it made sure the rindex was up to date, and if not, it called gfs2_rindex_update. However, if the file being fallocated was the rindex itself, it was already locked at that point. By calling gfs2_rindex_update at an earlier point in time, we bring rindex up to date and thereby avoid trying to lock it when the "allocation" is acquired. Signed-off-by:
Bob Peterson <rpeterso@redhat.com> Signed-off-by:
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