- Mar 14, 2013
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Takuya Yoshikawa authored
When we create or move a memory slot, we need to zap mmio sptes. Currently, zap_all() is used for this and this is causing two problems: - extra page faults after zapping mmu pages - long mmu_lock hold time during zapping mmu pages For the latter, Marcelo reported a disastrous mmu_lock hold time during hot-plug, which made the guest unresponsive for a long time. This patch takes a simple way to fix these problems: do not zap mmu pages unless they are marked mmio cached. On our test box, this took only 50us for the 4GB guest and we did not see ms of mmu_lock hold time any more. Note that we still need to do zap_all() for other cases. So another work is also needed: Xiao's work may be the one. Reviewed-by:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by:
Gleb Natapov <gleb@redhat.com>
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Takuya Yoshikawa authored
This will be used not to zap unrelated mmu pages when creating/moving a memory slot later. Reviewed-by:
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Jan Kiszka authored
Provided the host has this feature, it's straightforward to offer it to the guest as well. We just need to load to timer value on L2 entry if the feature was enabled by L1 and watch out for the corresponding exit reason. Reviewed-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
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Jan Kiszka authored
We will need EFER.LMA saving to provide unrestricted guest mode. All what is missing for this is picking up EFER.LMA from VM_ENTRY_CONTROLS on L2->L1 switches. If the host does not support EFER.LMA saving, no change is performed, otherwise we properly emulate for L1 what the hardware does for L0. Advertise the support, depending on the host feature. Reviewed-by:
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- Mar 13, 2013
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Jan Kiszka authored
Only interrupt and NMI exiting are mandatory for KVM to work, thus can be exposed to the guest unconditionally, virtual NMI exiting is optional. So we must not advertise it unless the host supports it. Introduce the symbolic constant PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR at this chance. Reviewed-by:
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Jan Kiszka authored
A VCPU sending INIT or SIPI to some other VCPU races for setting the remote VCPU's mp_state. When we were unlucky, KVM_MP_STATE_INIT_RECEIVED was overwritten by kvm_emulate_halt and, thus, got lost. This introduces APIC events for those two signals, keeping them in kvm_apic until kvm_apic_accept_events is run over the target vcpu context. kvm_apic_has_events reports to kvm_arch_vcpu_runnable if there are pending events, thus if vcpu blocking should end. The patch comes with the side effect of effectively obsoleting KVM_MP_STATE_SIPI_RECEIVED. We still accept it from user space, but immediately translate it to KVM_MP_STATE_INIT_RECEIVED + KVM_APIC_SIPI. The vcpu itself will no longer enter the KVM_MP_STATE_SIPI_RECEIVED state. That also means we no longer exit to user space after receiving a SIPI event. Furthermore, we already reset the VCPU on INIT, only fixing up the code segment later on when SIPI arrives. Moreover, we fix INIT handling for the BSP: it never enter wait-for-SIPI but directly starts over on INIT. Tested-by:
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Marcelo Tosatti authored
As noticed by Ulrich Obergfell <uobergfe@redhat.com>, the mmu counters are for beancounting purposes only - so n_used_mmu_pages and n_max_mmu_pages could be relaxed (example: before f0f5933a ), resulting in n_used_mmu_pages > n_max_mmu_pages. Make code robust against n_used_mmu_pages > n_max_mmu_pages. Reviewed-by:
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by:
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- Mar 12, 2013
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Jan Kiszka authored
Neither vmx nor svm nor the common part may generate an error on kvm_vcpu_reset. So drop the return code. Reviewed-by:
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Marcelo Tosatti authored
If the host TSC calibration fails, tsc_khz is zero (see tsc_init.c). Handle such case properly in KVM (instead of dividing by zero). https://bugzilla.redhat.com/show_bug.cgi?id=859282 Signed-off-by:
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- Mar 11, 2013
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Ioan Orghici authored
Signed-off-by:
Ioan <Orghici<ioan.orghici@gmail.com> Signed-off-by:
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Raghavendra K T authored
This helps in filtering out the eligible candidates further and thus potentially helps in quickly allowing preempted lockholders to run. Note that if a vcpu was spinning during preemption we filter them by checking whether they are preempted due to pause loop exit. Reviewed-by:
Chegu Vinod <chegu_vinod@hp.com> Reviewed-by:
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Signed-off-by:
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Raghavendra K T authored
Note that we mark as preempted only when vcpu's task state was Running during preemption. Thanks Jiannan, Avi for preemption notifier ideas. Thanks Gleb, PeterZ for their precious suggestions. Thanks Srikar for an idea on avoiding rcu lock while checking task state that improved overcommit numbers. Reviewed-by:
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- Mar 08, 2013
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Takuya Yoshikawa authored
Make the code for zapping the oldest mmu page, placed at the tail of the active list, a separate function. Reviewed-by:
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Takuya Yoshikawa authored
We are traversing the linked list, invalid_list, deleting each entry by kvm_mmu_free_page(). _safe version is there for such a case. Reviewed-by:
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Takuya Yoshikawa authored
The expression (sp)->gfn should not be expanded using @gfn. Although no user of these macros passes a string other than gfn now, this should be fixed before anyone sees strange errors. Note: ignored the following checkpatch errors: ERROR: Macros with complex values should be enclosed in parenthesis ERROR: trailing statements should be on next line Reviewed-by:
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Heiko Carstens authored
Add missing address space annotations to all put_guest()/get_guest() callers. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by:
Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
- add missing specification exception check - remove one level of indentation - use defines instead of magic numbers Signed-off-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
The code can be significantly shortened. There is no functional change, except that for large (> PAGE_SIZE) copies the guest translation would be done more frequently. However, there is not a single user which does this currently. If one gets added later on this functionality can be added easily again. Signed-off-by:
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Heiko Carstens authored
The put_guest_u*/get_guest_u* are nothing but wrappers for the regular put_user/get_user uaccess functions. The only difference is that before accessing user space the guest address must be translated to a user space address. Change the order of arguments for the guest access functions so they match their uaccess parts. Also remove the u* suffix, so we simply have put_guest/get_guest which will automatically use the right size dependent on pointer type of the destination/source that now must be correct. In result the same behaviour as put_user/get_user except that accesses must be aligned. Signed-off-by:
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Heiko Carstens authored
Let's change to the paradigm that every return code from guest memory access functions that is not zero translates to -EFAULT and do not explictly compare. Explictly comparing the return value with -EFAULT has already shown to be a bit fragile. In addition this is closer to the handling of copy_to/from_user functions, which imho is in general a good idea. Also shorten the return code handling in interrupt.c a bit. Signed-off-by:
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Heiko Carstens authored
When out-of-memory the tprot code incorrectly injected a program check for the guest which reported an addressing exception even if the guest address was valid. Let's use the new gmap_translate() which translates a guest address to a user space address whithout the chance of running into an out-of-memory situation. Also make it more explicit that for -EFAULT we won't find a vma. Signed-off-by:
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Heiko Carstens authored
Implement gmap_translate() function which translates a guest absolute address to a user space process address without establishing the guest page table entries. This is useful for kvm guest address translations where no memory access is expected to happen soon (e.g. tprot exception handler). Signed-off-by:
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Heiko Carstens authored
Guest access functions like copy_to/from_guest() call __guestaddr_to_user() which in turn call gmap_fault() in order to translate a guest address to a user space address. In error case __guest_addr_to_user() returns either -EFAULT or -ENOMEM. The copy_to/from_guest functions just pass these return values down to the callers. The -ENOMEM case however is problematic since there are several places which access guest memory like: rc = copy_to_guest(...); if (rc == -EFAULT) error_handling(); So in case of -ENOMEM the code assumes that the guest memory access succeeded even though it failed. This can cause guest data or state corruption. If __guestaddr_to_user() returns -ENOMEM the meaning is that a valid user space mapping exists, but there was not enough memory available when trying to build the guest mapping. In other words an out-of-memory situation occured. For normal user space accesses an out-of-memory situation causes the page fault handler to map -ENOMEM to -EFAULT (see fixup code in do_no_context()). We need to do exactly the same for the kvm gaccess functions. So __guestaddr_to_user() should just map all error codes to -EFAULT. Signed-off-by:
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Jan Kiszka authored
The logic for calculating the value with which we call kvm_set_cr0/4 was broken (will definitely be visible with nested unrestricted guest mode support). Also, we performed the check regarding CR0_ALWAYSON too early when in guest mode. What really needs to be done on both CR0 and CR4 is to mask out L1-owned bits and merge them in from L1's guest_cr0/4. In contrast, arch.cr0/4 and arch.cr0/4_guest_owned_bits contain the mangled L0+L1 state and, thus, are not suited as input. For both CRs, we can then apply the check against VMXON_CRx_ALWAYSON and refuse the update if it fails. To be fully consistent, we implement this check now also for CR4. For CR4, we move the check into vmx_set_cr4 while we keep it in handle_set_cr0. This is because the CR0 checks for vmxon vs. guest mode will diverge soon when adding unrestricted guest mode support. Finally, we have to set the shadow to the value L2 wanted to write originally. Reviewed-by:
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Jan Kiszka authored
Properly set those bits to 1 that the spec demands in case bit 55 of VMX_BASIC is 0 - like in our case. Reviewed-by:
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- Mar 06, 2013
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Jan Kiszka authored
Ouch, how could this work so well that far? We need to clear RFLAGS to the reset value as specified by the SDM. Particularly, IF must be off after VM-exit! Reviewed-by:
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Cornelia Huck authored
Enable ioeventfd support on s390 and hook up diagnose 500 virtio-ccw notifications. Signed-off-by:
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Cornelia Huck authored
Enhance KVM_IOEVENTFD with a new flag that allows to attach to virtio-ccw devices on s390 via the KVM_VIRTIO_CCW_NOTIFY_BUS. Signed-off-by:
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Cornelia Huck authored
Add a new bus type for virtio-ccw devices on s390. Signed-off-by:
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Cornelia Huck authored
Currently, eventfd introduces module_init/module_exit functions to initialize/cleanup the irqfd workqueue. This only works, however, if no other module_init/module_exit functions are built into the same module. Let's just move the initialization and cleanup to kvm_init and kvm_exit. This way, it is also clearer where kvm startup may fail. Signed-off-by:
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Cornelia Huck authored
Export the virtio-ccw api in a header for usage by other code. Signed-off-by:
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Michael S. Tsirkin authored
Lookups by channel/vq pair on host during virtio notifications might be expensive. Interpret hypercall return value as a cookie which host can use to do device lookups for the next notification more efficiently. [CH: Fix line > 80 chars] Tested-by:
Michael S. Tsirkin <mst@redhat.com> Signed-off-by:
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- Mar 05, 2013
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Jan Kiszka authored
First of all, do not blindly overwrite GUEST_DR7 on L2 entry. The host may have guest debugging enabled. Then properly reset DR7 and DEBUG_CTL on L2->L1 switch as specified in the SDM. Signed-off-by:
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Takuya Yoshikawa authored
This was replaced with prepare/commit long before: commit f7784b8e KVM: split kvm_arch_set_memory_region into prepare and commit Signed-off-by:
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Takuya Yoshikawa authored
This patch makes the parameter old a const pointer to the old memory slot and adds a new parameter named change to know the change being requested: the former is for removing extra copying and the latter is for cleaning up the code. Signed-off-by:
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Takuya Yoshikawa authored
This patch drops the parameter old, a copy of the old memory slot, and adds a new parameter named change to know the change being requested. This not only cleans up the code but also removes extra copying of the memory slot structure. Signed-off-by:
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Takuya Yoshikawa authored
This will be used for cleaning up prepare/commit_memory_region() later. Signed-off-by:
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Takuya Yoshikawa authored
Except ia64's stale code, KVM_SET_MEMORY_REGION support, this is only used for sanity checks in __kvm_set_memory_region() which can easily be changed to use slot id instead. Signed-off-by:
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Takuya Yoshikawa authored
X86 does not use this any more. The remaining user, s390's !user_alloc check, can be simply removed since KVM_SET_MEMORY_REGION ioctl is no longer supported. Note: fixed powerpc's indentations with spaces to suppress checkpatch errors. Signed-off-by:
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Marcelo Tosatti authored
* master: (15791 commits) Linux 3.9-rc1 btrfs/raid56: Add missing #include <linux/vmalloc.h> fix compat_sys_rt_sigprocmask() SUNRPC: One line comment fix ext4: enable quotas before orphan cleanup ext4: don't allow quota mount options when quota feature enabled ext4: fix a warning from sparse check for ext4_dir_llseek ext4: convert number of blocks to clusters properly ext4: fix possible memory leak in ext4_remount() jbd2: fix ERR_PTR dereference in jbd2__journal_start metag: Provide dma_get_sgtable() metag: prom.h: remove declaration of metag_dt_memblock_reserve() metag: copy devicetree to non-init memory metag: cleanup metag_ksyms.c includes metag: move mm/init.c exports out of metag_ksyms.c metag: move usercopy.c exports out of metag_ksyms.c metag: move setup.c exports out of metag_ksyms.c metag: move kick.c exports out of metag_ksyms.c metag: move traps.c exports out of metag_ksyms.c metag: move irq enable out of irqflags.h on SMP ... Signed-off-by:
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