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* KVM: Rename x86_emulate.c to emulate.cAvi Kivity2009-09-105-5/+5
| | | | | | We're in arch/x86, what could we possibly be emulating? Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: When switching to a vm8086 task, load segments as 16-bitAnthony Liguori2009-09-101-1/+8
| | | | | | | | | | | | | | According to 16.2.5 in the SDM, eflags.vm in the tss is consulted before loading and new segments. If eflags.vm == 1, then the segments are treated as 16-bit segments. The LDTR and TR are not normally available in vm86 mode so if they happen to somehow get loaded, they need to be treated as 32-bit segments. This fixes an invalid vmentry failure in a custom OS that was happening after a task switch into vm8086 mode. Since the segments were being mistakenly treated as 32-bit, we loaded garbage state. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: VMX: Adjust rflags if in real mode emulationAvi Kivity2009-09-101-1/+6
| | | | | | | We set rflags.vm86 when virtualizing real mode to do through vm8086 mode; so we need to take it out again when reading rflags. Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: Drop tlb flush workaround in nptAvi Kivity2009-09-101-11/+2
| | | | | | | It is no longer possible to reproduce the problem any more, so presumably it has been fixed. Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: Update cr8 intercept when APIC TPR is changed by userspaceGleb Natapov2009-09-101-0/+2
| | | | | | | | | Since on vcpu entry we do it only if apic is enabled we should do it when TPR is changed while apic is disabled. This happens when windows resets HW without setting TPR to zero. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: enable nested svm by defaultJoerg Roedel2009-09-101-1/+1
| | | | | | | | Nested SVM is (in my experience) stable enough to be enabled by default. So omit the requirement to pass a module parameter. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: check for nested VINTR flag in svm_interrupt_allowedJoerg Roedel2009-09-101-1/+1
| | | | | | | | Not checking for this flag breaks any nested hypervisor that does not set VINTR. So fix it with this patch. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: move nested_svm_intr main logic out of if-clauseJoerg Roedel2009-09-101-10/+11
| | | | | | | | This patch removes one indentation level from nested_svm_intr and makes the logic more readable. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: remove unnecessary is_nested check from svm_cpu_runJoerg Roedel2009-09-101-2/+1
| | | | | | | | This check is not necessary. We have to sync the vcpu->arch.cr2 always back to the VMCB. This patch remove the is_nested check. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: move special nested exit handling to separate functionJoerg Roedel2009-09-101-30/+50
| | | | | | | | | This patch moves the handling for special nested vmexits like #pf to a separate function. This makes the kvm_override parameter obsolete and makes the code more readable. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: handle errors in vmrun emulation path appropriatlyJoerg Roedel2009-09-101-1/+13
| | | | | | | | | If nested svm fails to load the msrpm the vmrun succeeds with the old msrpm which is not correct. This patch changes the logic to roll back to host mode in case the msrpm cannot be loaded. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: remove nested_svm_do and helper functionsJoerg Roedel2009-09-101-60/+0
| | | | | | | This function is not longer required. So remove it. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: clean up nested vmrun pathJoerg Roedel2009-09-101-12/+22
| | | | | | | | This patch removes the usage of nested_svm_do from the vmrun emulation path. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: clean up nestec vmload/vmsave pathsJoerg Roedel2009-09-101-19/+17
| | | | | | | | This patch removes the usage of nested_svm_do from the vmload and vmsave emulation code paths. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: clean up nested_svm_exit_handled_msrJoerg Roedel2009-09-101-17/+21
| | | | | | | | | | | This patch changes nested svm to call nested_svm_exit_handled_msr directly and not through nested_svm_do. [alex: fix oops due to nested kmap_atomics] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: get rid of nested_svm_vmexit_realJoerg Roedel2009-09-101-12/+40
| | | | | | | | | | | | | This patch is the starting point of removing nested_svm_do from the nested svm code. The nested_svm_do function basically maps two guest physical pages to host virtual addresses and calls a passed function on it. This function pointer code flow is hard to read and not the best technical solution here. As a side effect this patch indroduces the nested_svm_[un]map helper functions. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: simplify nested_svm_check_exceptionJoerg Roedel2009-09-101-11/+8
| | | | | | | | Makes the code of this function more readable by removing on indentation level for the core logic. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: do nested vmexit in nested_svm_exit_handledJoerg Roedel2009-09-101-23/+19
| | | | | | | | | | If this function returns true a nested vmexit is required. Move that vmexit into the nested_svm_exit_handled function. This also simplifies the handling of nested #pf intercepts in this function. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: consolidate nested_svm_exit_handledJoerg Roedel2009-09-101-60/+49
| | | | | | | | | | When caching guest intercepts there is no need anymore for the nested_svm_exit_handled_real function. So move its code into nested_svm_exit_handled. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: cache nested interceptsJoerg Roedel2009-09-101-7/+23
| | | | | | | | | | | When the nested intercepts are cached we don't need to call get_user_pages and/or map the nested vmcb on every nested #vmexit to check who will handle the intercept. Further this patch aligns the emulated svm behavior better to real hardware. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: move nested svm state into seperate structJoerg Roedel2009-09-101-29/+33
| | | | | | | | | This makes it more clear for which purpose these members in the vcpu_svm exist. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: complete interrupts after handling nested exitsJoerg Roedel2009-09-101-2/+3
| | | | | | | | | | The interrupt completion code must run after nested exits are handled because not injected interrupts or exceptions may be handled by the l1 guest first. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: copy only necessary parts of the control area on vmrun/vmexitJoerg Roedel2009-09-101-2/+34
| | | | | | | | | | The vmcb control area contains more then 800 bytes of reserved fields which are unnecessarily copied. Fix this by introducing a copy function which only copies the relevant part and saves time. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: optimize nested vmrunJoerg Roedel2009-09-101-7/+21
| | | | | | | | | Only copy the necessary parts of the vmcb save area on vmrun and save precious time. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: optimize nested #vmexitJoerg Roedel2009-09-101-35/+33
| | | | | | | | | It is more efficient to copy only the relevant parts of the vmcb back to the nested vmcb when we emulate an vmexit. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: SVM: add helper functions for global interrupt flagJoerg Roedel2009-09-101-8/+25
| | | | | | | | | This patch makes the code easier to read when it comes to setting, clearing and checking the status of the virtualized global interrupt flag for the VCPU. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* x86: Export kmap_atomic_to_page()Avi Kivity2009-09-101-0/+1
| | | | | | Needed by KVM. Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: Replace pic_lock()/pic_unlock() with direct call to spinlock functionsGleb Natapov2009-09-101-24/+12
| | | | | | | They are not doing anything else now. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: Call ack notifiers from PIC when guest OS acks an IRQ.Gleb Natapov2009-09-101-14/+4
| | | | | | | | | | Currently they are called when irq vector is been delivered. Calling ack notifiers at this point is wrong. Device assignment ack notifier enables host interrupts, but guest not yet had a chance to clear interrupt condition in a device. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: Call kvm_vcpu_kick() inside pic spinlockGleb Natapov2009-09-102-10/+1
| | | | | | | | d5ecfdd25 moved it out because back than it was impossible to call it inside spinlock. This restriction no longer exists. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: fix EFER read buffer overflowRoel Kluin2009-09-101-2/+5
| | | | | | | | | Check whether index is within bounds before grabbing the element. Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Cc: Avi Kivity <avi@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: ignore reads to perfctr msrsAmit Shah2009-09-101-0/+3
| | | | | | | | | | We ignore writes to the perfctr msrs. Ignore reads as well. Kaspersky antivirus crashes Windows guests if it can't read these MSRs. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: VMX: Optimize vmx_get_cpl()Avi Kivity2009-09-101-4/+1
| | | | | | | Instead of calling vmx_get_segment() (which reads a whole bunch of vmcs fields), read only the cs selector which contains the cpl. Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: x86: Disallow hypercalls for guest callers in rings > 0Jan Kiszka2009-09-101-0/+6
| | | | | | | | | | | | | | | So far unprivileged guest callers running in ring 3 can issue, e.g., MMU hypercalls. Normally, such callers cannot provide any hand-crafted MMU command structure as it has to be passed by its physical address, but they can still crash the guest kernel by passing random addresses. To close the hole, this patch considers hypercalls valid only if issued from guest ring 0. This may still be relaxed on a per-hypercall base in the future once required. Cc: stable@kernel.org Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: MMU: fix bogus alloc_mmu_pages assignmentMarcelo Tosatti2009-09-101-8/+0
| | | | | | | | | | | Remove the bogus n_free_mmu_pages assignment from alloc_mmu_pages. It breaks accounting of mmu pages, since n_free_mmu_pages is modified but the real number of pages remains the same. Cc: stable@kernel.org Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: MMU: make __kvm_mmu_free_some_pages handle empty listIzik Eidus2009-09-101-1/+2
| | | | | | | | | | First check if the list is empty before attempting to look at list entries. Cc: stable@kernel.org Signed-off-by: Izik Eidus <ieidus@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: remove superfluous NULL pointer check in kvm_inject_pit_timer_irqs()Bartlomiej Zolnierkiewicz2009-09-101-1/+1
| | | | | | | | | | | | | | | This takes care of the following entries from Dan's list: arch/x86/kvm/i8254.c +714 kvm_inject_pit_timer_irqs(6) warning: variable derefenced in initializer 'vcpu' arch/x86/kvm/i8254.c +714 kvm_inject_pit_timer_irqs(6) warning: variable derefenced before check 'vcpu' Reported-by: Dan Carpenter <error27@gmail.com> Cc: corbet@lwn.net Cc: eteo@redhat.com Cc: Julia Lawall <julia@diku.dk> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Acked-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: report 1GB page support to userspaceJoerg Roedel2009-09-104-1/+16
| | | | | | | | If userspace knows that the kernel part supports 1GB pages it can enable the corresponding cpuid bit so that guests actually use GB pages. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: MMU: enable gbpages by increasing nr of pagesizesJoerg Roedel2009-09-101-1/+1
| | | | | Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: MMU: shadow support for 1gb pagesJoerg Roedel2009-09-103-36/+22
| | | | | | | | | | | | | This patch adds support for shadow paging to the 1gb page table code in KVM. With this code the guest can use 1gb pages even if the host does not support them. [ Marcelo: fix shadow page collision on pmd level if a guest 1gb page is mapped with 4kb ptes on host level ] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: MMU: make page walker aware of mapping levelsJoerg Roedel2009-09-102-25/+44
| | | | | | | | | | | The page walker may be used with nested paging too when accessing mmio areas. Make it support the additional page-level too. [ Marcelo: fix reserved bit check for 1gb pte ] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: MMU: make direct mapping paths aware of mapping levelsJoerg Roedel2009-09-103-38/+53
| | | | | Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: MMU: rename is_largepage_backed to mapping_levelJoerg Roedel2009-09-102-35/+69
| | | | | | | | With the new name and the corresponding backend changes this function can now support multiple hugepage sizes. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: MMU: make rmap code aware of mapping levelsJoerg Roedel2009-09-101-25/+28
| | | | | | | | | This patch removes the largepage parameter from the rmap_add function. Together with rmap_remove this function now uses the role.level field to find determine if the page is a huge page. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: limit lapic periodic timer frequencyMarcelo Tosatti2009-09-101-0/+9
| | | | | | | | | Otherwise its possible to starve the host by programming lapic timer with a very high frequency. Cc: stable@kernel.org Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: Align cr8 threshold when userspace changes cr8Mikhail Ershov2009-09-101-0/+2
| | | | | | | | | | | Commit f0a3602c20 ("KVM: Move interrupt injection logic to x86.c") does not update the cr8 intercept if the lapic is disabled, so when userspace updates cr8, the cr8 threshold control is not updated and we are left with illegal control fields. Fix by explicitly resetting the cr8 threshold. Signed-off-by: Avi Kivity <avi@redhat.com>
* KVM: VMX: Avoid to return ENOTSUPP to userlandJan Kiszka2009-09-101-2/+2
| | | | | | | | Choose some allowed error values for the cases VMX returned ENOTSUPP so far as these values could be returned by the KVM_RUN IOCTL. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
* KVM: PIT: Unregister ack notifier callback when freeingGleb Natapov2009-09-101-0/+2
| | | | | Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
* KVM: VMX: Introduce KVM_SET_IDENTITY_MAP_ADDR ioctlSheng Yang2009-09-103-5/+30
| | | | | | | | | | Now KVM allow guest to modify guest's physical address of EPT's identity mapping page. (change from v1, discard unnecessary check, change ioctl to accept parameter address rather than value) Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
* KVM: x86: use kvm_get_gdt() and kvm_read_ldt()Akinobu Mita2009-09-102-6/+5
| | | | | | | | | Use kvm_get_gdt() and kvm_read_ldt() to reduce inline assembly code. Cc: Avi Kivity <avi@redhat.com> Cc: kvm@vger.kernel.org Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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