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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 Kiszka2-0/+7
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 Roedel4-1/+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>
2009-09-10KVM: MMU: enable gbpages by increasing nr of pagesizesJoerg Roedel1-1/+1
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: MMU: shadow support for 1gb pagesJoerg Roedel3-36/+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>
2009-09-10KVM: MMU: make page walker aware of mapping levelsJoerg Roedel2-25/+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>
2009-09-10KVM: MMU: make direct mapping paths aware of mapping levelsJoerg Roedel3-38/+53
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: MMU: rename is_largepage_backed to mapping_levelJoerg Roedel2-35/+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>
2009-09-10KVM: MMU: make rmap code aware of mapping levelsJoerg Roedel1-25/+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>
2009-09-10KVM: fix kvm_init() error handlingXiao Guangrong1-1/+1
Remove debugfs file if kvm_arch_init() return error Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: limit lapic periodic timer frequencyMarcelo Tosatti1-0/+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>
2009-09-10KVM: Align cr8 threshold when userspace changes cr8Mikhail Ershov1-0/+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>
2009-09-10KVM: VMX: Avoid to return ENOTSUPP to userlandJan Kiszka1-2/+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>
2009-09-10KVM: Drop obsolete cpu_get/put in make_all_cpus_requestJan Kiszka1-2/+1
spin_lock disables preemption, so we can simply read the current cpu. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: PIT: Unregister ack notifier callback when freeingGleb Natapov1-0/+2
Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: VMX: Introduce KVM_SET_IDENTITY_MAP_ADDR ioctlSheng Yang4-5/+32
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>
2009-09-10KVM: x86: use kvm_get_gdt() and kvm_read_ldt()Akinobu Mita2-6/+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>
2009-09-10KVM: x86: use get_desc_base() and get_desc_limit()Akinobu Mita1-13/+5
Use get_desc_base() and get_desc_limit() to get the base address and limit in desc_struct. 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>
2009-09-10KVM: s390: remove unused structsGleb Natapov1-9/+0
They are not used by common code without defines which s390 does not have. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: MMU: fix missing locking in alloc_mmu_pagesMarcelo Tosatti1-0/+2
n_requested_mmu_pages/n_free_mmu_pages are used by kvm_mmu_change_mmu_pages to calculate the number of pages to zap. alloc_mmu_pages, called from the vcpu initialization path, modifies this variables without proper locking, which can result in a negative value in kvm_mmu_change_mmu_pages (say, with cpu hotplug). Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: Discard unnecessary kvm_mmu_flush_tlb() in kvm_mmu_load()Sheng Yang1-1/+1
set_cr3() should already cover the TLB flushing. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: silence lapic kernel messages that can be triggered by a guestGleb Natapov1-4/+4
Some Linux versions (f8) try to read EOI register that is write only. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: Reduce runnability interface with arch support codeGleb Natapov7-40/+11
Remove kvm_cpu_has_interrupt() and kvm_arch_interrupt_allowed() from interface between general code and arch code. kvm_arch_vcpu_runnable() checks for interrupts instead. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Move kvm_cpu_get_interrupt() declaration to x86 codeGleb Natapov2-1/+1
It is implemented only by x86. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Move exception handling to the same place as other eventsGleb Natapov1-12/+9
Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: MMU: Fix MMU_DEBUG compile breakageJoerg Roedel1-2/+2
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: add ioeventfd supportGregory Haskins5-4/+293
ioeventfd is a mechanism to register PIO/MMIO regions to trigger an eventfd signal when written to by a guest. Host userspace can register any arbitrary IO address with a corresponding eventfd and then pass the eventfd to a specific end-point of interest for handling. Normal IO requires a blocking round-trip since the operation may cause side-effects in the emulated model or may return data to the caller. Therefore, an IO in KVM traps from the guest to the host, causes a VMX/SVM "heavy-weight" exit back to userspace, and is ultimately serviced by qemu's device model synchronously before returning control back to the vcpu. However, there is a subclass of IO which acts purely as a trigger for other IO (such as to kick off an out-of-band DMA request, etc). For these patterns, the synchronous call is particularly expensive since we really only want to simply get our notification transmitted asychronously and return as quickly as possible. All the sychronous infrastructure to ensure proper data-dependencies are met in the normal IO case are just unecessary overhead for signalling. This adds additional computational load on the system, as well as latency to the signalling path. Therefore, we provide a mechanism for registration of an in-kernel trigger point that allows the VCPU to only require a very brief, lightweight exit just long enough to signal an eventfd. This also means that any clients compatible with the eventfd interface (which includes userspace and kernelspace equally well) can now register to be notified. The end result should be a more flexible and higher performance notification API for the backend KVM hypervisor and perhipheral components. To test this theory, we built a test-harness called "doorbell". This module has a function called "doorbell_ring()" which simply increments a counter for each time the doorbell is signaled. It supports signalling from either an eventfd, or an ioctl(). We then wired up two paths to the doorbell: One via QEMU via a registered io region and through the doorbell ioctl(). The other is direct via ioeventfd. You can download this test harness here: ftp://ftp.novell.com/dev/ghaskins/doorbell.tar.bz2 The measured results are as follows: qemu-mmio: 110000 iops, 9.09us rtt ioeventfd-mmio: 200100 iops, 5.00us rtt ioeventfd-pio: 367300 iops, 2.72us rtt I didn't measure qemu-pio, because I have to figure out how to register a PIO region with qemu's device model, and I got lazy. However, for now we can extrapolate based on the data from the NULLIO runs of +2.56us for MMIO, and -350ns for HC, we get: qemu-pio: 153139 iops, 6.53us rtt ioeventfd-hc: 412585 iops, 2.37us rtt these are just for fun, for now, until I can gather more data. Here is a graph for your convenience: http://developer.novell.com/wiki/images/7/76/Iofd-chart.png The conclusion to draw is that we save about 4us by skipping the userspace hop. -------------------- Signed-off-by: Gregory Haskins <ghaskins@novell.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: make io_bus interface more robustGregory Haskins6-15/+79
Today kvm_io_bus_regsiter_dev() returns void and will internally BUG_ON if it fails. We want to create dynamic MMIO/PIO entries driven from userspace later in the series, so we need to enhance the code to be more robust with the following changes: 1) Add a return value to the registration function 2) Fix up all the callsites to check the return code, handle any failures, and percolate the error up to the caller. 3) Add an unregister function that collapses holes in the array Signed-off-by: Gregory Haskins <ghaskins@novell.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: add module parameters documentationAndre Przywara1-0/+39
Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: PIT support for HPET legacy modeBeth Kon5-6/+93
When kvm is in hpet_legacy_mode, the hpet is providing the timer interrupt and the pit should not be. So in legacy mode, the pit timer is destroyed, but the *state* of the pit is maintained. So if kvm or the guest tries to modify the state of the pit, this modification is accepted, *except* that the timer isn't actually started. When we exit hpet_legacy_mode, the current state of the pit (which is up to date since we've been accepting modifications) is used to restart the pit timer. The saved_mode code in kvm_pit_load_count temporarily changes mode to 0xff in order to destroy the timer, but then restores the actual value, again maintaining "current" state of the pit for possible later reenablement. [avi: add some reserved storage in the ioctl; make SET_PIT2 IOW] [marcelo: fix memory corruption due to reserved storage] Signed-off-by: Beth Kon <eak@us.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Always report x2apic as supported featureGleb Natapov1-0/+3
We emulate x2apic in software, so host support is not required. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: No need to kick cpu if not in a guest modeGleb Natapov1-0/+1
This will save a couple of IPIs. Signed-off-by: Gleb Natapov <gleb@redhat.com> Acked-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Add trace points in irqchip codeGleb Natapov6-0/+152
Add tracepoint in msi/ioapic/pic set_irq() functions, in IPI sending and in the point where IRQ is placed into apic's IRR. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: ignore msi request if !levelMichael S. Tsirkin1-1/+3
Irqfd sets level for interrupt to 1 and then to 0. For MSI, check level so that a single message is sent. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: fix MMIO_CONF_BASE MSR accessAndre Przywara1-0/+8
Some Windows versions check whether the BIOS has setup MMI/O for config space accesses on AMD Fam10h CPUs, we say "no" by returning 0 on reads and only allow disabling of MMI/O CfgSpace setup by igoring "0" writes. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Trace shadow page lifecycleAvi Kivity2-4/+109
Create, sync, unsync, zap. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Document basic APIAvi Kivity1-0/+683
Document the basic API corresponding to the 2.6.22 release. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: MMU: Trace guest pagetable walkerAvi Kivity3-3/+128
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10Revert "KVM: x86: check for cr3 validity in ioctl_set_sregs"Jan Kiszka1-7/+1
This reverts commit 6c20e1442bb1c62914bb85b7f4a38973d2a423ba. To my understanding, it became obsolete with the advent of the more robust check in mmu_alloc_roots (89da4ff17f). Moreover, it prevents the conceptually safe pattern 1. set sregs 2. register mem-slots 3. run vcpu by setting a sticky triple fault during step 1. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: handle AMD microcode MSRAndre Przywara1-0/+1
Windows 7 tries to update the CPU's microcode on some processors, so we ignore the MSR write here. The patchlevel register is already handled (returning 0), because the MSR number is the same as Intel's. Signed-off-by: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Fix apic_mmio_write return for unaligned writeSheng Yang1-1/+1
Some in-famous OS do unaligned writing for APIC MMIO, and the return value has been missed in recent change, then the OS hangs. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Use temporary variable to shorten lines.Gleb Natapov1-8/+10
Cosmetic only. No logic is changed by this patch. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: x2apic interface to lapicGleb Natapov3-59/+173
This patch implements MSR interface to local apic as defines by x2apic Intel specification. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Add Directed EOI support to APIC emulationGleb Natapov5-10/+39
Directed EOI is specified by x2APIC, but is available even when lapic is in xAPIC mode. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: Trace apic registers using their symbolic namesAvi Kivity1-2/+12
Signed-off-by: Avi Kivity <avi@redhat.com>
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