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2009-09-14Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds22-1321/+3210
* 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (202 commits) MAINTAINERS: update KVM entry KVM: correct error-handling code KVM: fix compile warnings on s390 KVM: VMX: Check cpl before emulating debug register access KVM: fix misreporting of coalesced interrupts by kvm tracer KVM: x86: drop duplicate kvm_flush_remote_tlb calls KVM: VMX: call vmx_load_host_state() only if msr is cached KVM: VMX: Conditionally reload debug register 6 KVM: Use thread debug register storage instead of kvm specific data KVM guest: do not batch pte updates from interrupt context KVM: Fix coalesced interrupt reporting in IOAPIC KVM guest: fix bogus wallclock physical address calculation KVM: VMX: Fix cr8 exiting control clobbering by EPT KVM: Optimize kvm_mmu_unprotect_page_virt() for tdp KVM: Document KVM_CAP_IRQCHIP KVM: Protect update_cr8_intercept() when running without an apic KVM: VMX: Fix EPT with WP bit change during paging KVM: Use kvm_{read,write}_guest_virt() to read and write segment descriptors KVM: x86 emulator: Add adc and sbb missing decoder flags KVM: Add missing #include ...
2009-09-10KVM: VMX: Check cpl before emulating debug register accessAvi Kivity2-0/+15
Debug registers may only be accessed from cpl 0. Unfortunately, vmx will code to emulate the instruction even though it was issued from guest userspace, possibly leading to an unexpected trap later. Cc: stable@kernel.org Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: fix misreporting of coalesced interrupts by kvm tracerGleb Natapov1-1/+1
Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: x86: drop duplicate kvm_flush_remote_tlb callsMarcelo Tosatti1-2/+0
kvm_mmu_slot_remove_write_access already calls it. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: VMX: call vmx_load_host_state() only if msr is cachedGleb Natapov1-2/+2
No need to call it before each kvm_(set|get)_msr_common() Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: VMX: Conditionally reload debug register 6Avi Kivity1-5/+9
Only reload debug register 6 if we're running with the guest's debug registers. Saves around 150 cycles from the guest lightweight exit path. dr6 contains a couple of bits that are updated on #DB, so intercept that unconditionally and update those bits then. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: Use thread debug register storage instead of kvm specific dataAvi Kivity1-15/+7
Instead of saving the debug registers from the processor to a kvm data structure, rely in the debug registers stored in the thread structure. This allows us not to save dr6 and dr7. Reduces lightweight vmexit cost by 350 cycles, or 11 percent. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: VMX: Fix cr8 exiting control clobbering by EPTGleb Natapov1-6/+3
Don't call adjust_vmx_controls() two times for the same control. It restores options that were dropped earlier. This loses us the cr8 exit control, which causes a massive performance regression Windows x64. Cc: stable@kernel.org Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Optimize kvm_mmu_unprotect_page_virt() for tdpAvi Kivity1-0/+3
We know no pages are protected, so we can short-circuit the whole thing (including fairly nasty guest memory accesses). Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Protect update_cr8_intercept() when running without an apicAvi Kivity1-0/+3
update_cr8_intercept() can be triggered from userspace while there is no apic present. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: VMX: Fix EPT with WP bit change during pagingSheng Yang1-3/+3
QNX update WP bit when paging enabled, which is not covered yet. This one fix QNX boot with EPT. Cc: stable@kernel.org Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Use kvm_{read,write}_guest_virt() to read and write segment descriptorsMikhail Ershov1-8/+2
Segment descriptors tables can be placed on two non-contiguous pages. This patch makes reading segment descriptors by linear address. Signed-off-by: Mikhail Ershov <Mike.Ershov@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x86 emulator: Add adc and sbb missing decoder flagsMohammed Gamal1-2/+2
Add missing decoder flags for adc and sbb instructions (opcodes 0x14-0x15, 0x1c-0x1d) Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Rename x86_emulate.c to emulate.cAvi Kivity3-4/+4
We're in arch/x86, what could we possibly be emulating? Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: When switching to a vm8086 task, load segments as 16-bitAnthony Liguori1-1/+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>
2009-09-10KVM: VMX: Adjust rflags if in real mode emulationAvi Kivity1-1/+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>
2009-09-10KVM: SVM: Drop tlb flush workaround in nptAvi Kivity1-11/+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>
2009-09-10KVM: Update cr8 intercept when APIC TPR is changed by userspaceGleb Natapov1-0/+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>
2009-09-10KVM: SVM: enable nested svm by defaultJoerg Roedel1-1/+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>
2009-09-10KVM: SVM: check for nested VINTR flag in svm_interrupt_allowedJoerg Roedel1-1/+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>
2009-09-10KVM: SVM: move nested_svm_intr main logic out of if-clauseJoerg Roedel1-10/+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>
2009-09-10KVM: SVM: remove unnecessary is_nested check from svm_cpu_runJoerg Roedel1-2/+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>
2009-09-10KVM: SVM: move special nested exit handling to separate functionJoerg Roedel1-30/+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>
2009-09-10KVM: SVM: handle errors in vmrun emulation path appropriatlyJoerg Roedel1-1/+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>
2009-09-10KVM: SVM: remove nested_svm_do and helper functionsJoerg Roedel1-60/+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>
2009-09-10KVM: SVM: clean up nested vmrun pathJoerg Roedel1-12/+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>
2009-09-10KVM: SVM: clean up nestec vmload/vmsave pathsJoerg Roedel1-19/+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>
2009-09-10KVM: SVM: clean up nested_svm_exit_handled_msrJoerg Roedel1-17/+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>
2009-09-10KVM: SVM: get rid of nested_svm_vmexit_realJoerg Roedel1-12/+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>
2009-09-10KVM: SVM: simplify nested_svm_check_exceptionJoerg Roedel1-11/+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>
2009-09-10KVM: SVM: do nested vmexit in nested_svm_exit_handledJoerg Roedel1-23/+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>
2009-09-10KVM: SVM: consolidate nested_svm_exit_handledJoerg Roedel1-60/+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>
2009-09-10KVM: SVM: cache nested interceptsJoerg Roedel1-7/+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>
2009-09-10KVM: SVM: move nested svm state into seperate structJoerg Roedel1-29/+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>
2009-09-10KVM: SVM: complete interrupts after handling nested exitsJoerg Roedel1-2/+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>
2009-09-10KVM: SVM: copy only necessary parts of the control area on vmrun/vmexitJoerg Roedel1-2/+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>
2009-09-10KVM: SVM: optimize nested vmrunJoerg Roedel1-7/+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>
2009-09-10KVM: SVM: optimize nested #vmexitJoerg Roedel1-35/+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>
2009-09-10KVM: SVM: add helper functions for global interrupt flagJoerg Roedel1-8/+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>
2009-09-10KVM: Replace pic_lock()/pic_unlock() with direct call to spinlock functionsGleb Natapov1-24/+12
They are not doing anything else now. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Call ack notifiers from PIC when guest OS acks an IRQ.Gleb Natapov1-14/+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>
2009-09-10KVM: Call kvm_vcpu_kick() inside pic spinlockGleb Natapov2-10/+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>
2009-09-10KVM: fix EFER read buffer overflowRoel Kluin1-2/+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>
2009-09-10KVM: ignore reads to perfctr msrsAmit Shah1-0/+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>
2009-09-10KVM: VMX: Optimize vmx_get_cpl()Avi Kivity1-4/+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>
2009-09-10KVM: x86: Disallow hypercalls for guest callers in rings > 0Jan Kiszka1-0/+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>
2009-09-10KVM: MMU: fix bogus alloc_mmu_pages assignmentMarcelo Tosatti1-8/+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>
2009-09-10KVM: MMU: make __kvm_mmu_free_some_pages handle empty listIzik Eidus1-1/+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>
2009-09-10KVM: remove superfluous NULL pointer check in kvm_inject_pit_timer_irqs()Bartlomiej Zolnierkiewicz1-1/+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>
2009-09-10KVM: report 1GB page support to userspaceJoerg Roedel3-1/+14
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>
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