- 10 Jun, 2009 40 commits
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Avi Kivity authored
If userspace specifies a memory slot that is larger than 8 petabytes, it could overflow the largepages variable. Cc: stable@kernel.org Signed-off-by:Avi Kivity <avi@redhat.com>
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Avi Kivity authored
If a slots guest physical address and host virtual address unequal (mod large page size), then we would erronously try to back guest large pages with host large pages. Detect this misalignment and diable large page support for the trouble slot. Cc: stable@kernel.org Signed-off-by: -
Andi Kleen authored
VT-x needs an explicit MC vector intercept to handle machine checks in the hyper visor. It also has a special option to catch machine checks that happen during VT entry. Do these interceptions and forward them to the Linux machine check handler. Make it always look like user space is interrupted because the machine check handler treats kernel/user space differently. Thanks to Jiang Yunhong for help and testing. Cc: stable@kernel.org Signed-off-by:
Andi Kleen <ak@linux.intel.com> Signed-off-by:
Huang Ying <ying.huang@intel.com> Signed-off-by:
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Nitin A Kamble authored
That way the interpretation of rmode.active becomes more clear with unrestricted guest code. Signed-off-by:
Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by:
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Gleb Natapov authored
To save us one reading of VM_EXIT_INTR_INFO. Signed-off-by:
Gleb Natapov <gleb@redhat.com> Signed-off-by:
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Gleb Natapov authored
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Gleb Natapov authored
INTn will be re-executed after migration. If we wanted to migrate pending software interrupt we would need to migrate interrupt type and instruction length too, but we do not have all required info on SVM, so SVM->VMX migration would need to re-execute INTn anyway. To make it simple never migrate pending soft interrupt. Signed-off-by:
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Gleb Natapov authored
If NMI is received during handling of another NMI it should be injected immediately after IRET from previous NMI handler, but SVM intercept IRET before instruction execution so we can't inject pending NMI at this point and there is not way to request exit when NMI window opens. This patch fix SVM code to open NMI window after IRET by single stepping over IRET instruction. Signed-off-by:
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Gleb Natapov authored
Currently they are not requested if there is pending exception. Signed-off-by:
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Gleb Natapov authored
Re-inject event instead. This is what Intel suggest. Also use correct instruction length when re-injecting soft fault/interrupt. Signed-off-by:
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Gleb Natapov authored
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Gleb Natapov authored
Only one interrupt vector can be injected from userspace irqchip at any given time so no need to store it in a bitmap. Put it into interrupt queue directly. Signed-off-by:
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Gleb Natapov authored
The exception will immediately close the interrupt window. Signed-off-by:
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Gleb Natapov authored
It is done for exception and interrupt already. Signed-off-by:
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Carsten Otte authored
This check verifies that the guest we're trying to run in KVM_RUN has some memory assigned to it. It enters an endless exception loop if this is not the case. Reported-by:
Mijo Safradin <mijo@linux.vnet.ibm.com> Signed-off-by:
Carsten Otte <cotte@de.ibm.com> Signed-off-by:
Christian Ehrhardt <ehrhardt@de.ibm.com> Signed-off-by:
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Carsten Otte authored
This patch adds a sanity check for the content of the guest prefix register content before faulting in the cpu lowcore that it refers to. The guest might end up in an endless loop where SIE complains about missing lowcore with incorrect content of the prefix register without this fix. Reported-by:
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Carsten Otte authored
This patch makes sure we do unlink a vcpu's sie control block from the system control area in kvm_arch_vcpu_destroy. This prevents illegal accesses to the sie control block from other virtual cpus after free. Reported-by:
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Christian Borntraeger authored
The floating interrupt lock is only taken in process context. We can replace all spin_lock_bh with standard spin_lock calls. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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Christian Borntraeger authored
This patch reworks the s390 clock comparator wakeup to hrtimer. The clock comparator is a per-cpu value that is compared against the TOD clock. If ckc <= TOD an external interrupt 1004 is triggered. Since the clock comparator and the TOD clock have a much higher resolution than jiffies we should use hrtimers to trigger the wakeup. This speeds up guest nanosleep for small values. Since hrtimers callbacks run in hard-irq context, I added a tasklet to do the actual work with enabled interrupts. Signed-off-by:
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Carsten Otte authored
This patch fixes an incorrectness in the kvm backend for s390. In case virtual cpus are being created before the corresponding memory slot is being registered, we need to update the sie control blocks for the virtual cpus. *updates in v3* In consideration of the s390 memslot constraints locking was changed to trylock. These locks should never be held, as vcpu's can't run without the single memslot we just assign when running this code. To ensure this never deadlocks in case other code changes the code uses trylocks and bail out if it can't get all locks. Additionally most of the discussed special conditions for s390 like only one memslot and no user_alloc are now checked for validity in kvm_arch_set_memory_region. Reported-by:
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Robert P. J. Day authored
Signed-off-by:
Robert P. J. Day <rpjday@crashcourse.ca> Cc: Avi Kivity <avi@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Marcelo Tosatti authored
Verify the cr3 address stored in vcpu->arch.cr3 points to an existant memslot. If not, inject a triple fault. Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
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Marcelo Tosatti authored
kvm_handle_hva relies on mmu_lock protection to safely access the memslot structures. Signed-off-by:
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Marcelo Tosatti authored
kvm_handle_hva, called by MMU notifiers, manipulates mmu data only with the protection of mmu_lock. Update kvm_mmu_change_mmu_pages callers to take mmu_lock, thus protecting against kvm_handle_hva. Signed-off-by:
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Glauber Costa authored
We currently unblock shadow interrupt state when we skip an instruction, but failing to do so when we actually emulate one. This blocks interrupts in key instruction blocks, in particular sti; hlt; sequences If the instruction emulated is an sti, we have to block shadow interrupts. The same goes for mov ss. pop ss also needs it, but we don't currently emulate it. Without this patch, I cannot boot gpxe option roms at vmx machines. This is described at https://bugzilla.redhat.com/show_bug.cgi?id=494469Signed-off-by:
Glauber Costa <glommer@redhat.com> CC: H. Peter Anvin <hpa@zytor.com> CC: Gleb Natapov <gleb@redhat.com> Signed-off-by:
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Glauber Costa authored
This patch replaces drop_interrupt_shadow with the more general set_interrupt_shadow, that can either drop or raise it, depending on its parameter. It also adds ->get_interrupt_shadow() for future use. Signed-off-by:
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Marcelo Tosatti authored
kvm_assigned_dev_ack_irq is vulnerable to a race condition with the interrupt handler function. It does: if (dev->host_irq_disabled) { enable_irq(dev->host_irq); dev->host_irq_disabled = false; } If an interrupt triggers before the host->dev_irq_disabled assignment, it will disable the interrupt and set dev->host_irq_disabled to true. On return to kvm_assigned_dev_ack_irq, dev->host_irq_disabled is set to false, and the next kvm_assigned_dev_ack_irq call will fail to reenable it. Other than that, having the interrupt handler and work handlers run in parallel sounds like asking for trouble (could not spot any obvious problem, but better not have to, its fragile). CC: sheng.yang@intel.com Signed-off-by: -
Marcelo Tosatti authored
KVM uses a function call IPI to cause the exit of a guest running on a physical cpu. For virtual interrupt notification there is no need to wait on IPI receival, or to execute any function. This is exactly what the reschedule IPI does, without the overhead of function IPI. So use it instead of smp_call_function_single in kvm_vcpu_kick. Also change the "guest_mode" variable to a bit in vcpu->requests, and use that to collapse multiple IPI's that would be issued between the first one and zeroing of guest mode. This allows kvm_vcpu_kick to called with interrupts disabled. Signed-off-by:
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Avi Kivity authored
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Avi Kivity authored
Add cpu feature bit support for the MOVBE and POPCNT instructions. Signed-off-by: -
Avi Kivity authored
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Avi Kivity authored
MTRR, PAT, MCE, and MCA are all supported (to some extent) but not reported. Vista requires these features, so if userspace relies on kernel cpuid reporting, it loses support for Vista. Signed-off-by: -
Jan Kiszka authored
The stats entry request_nmi is no longer used as the related user space interface was dropped. So clean it up. Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
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Gleb Natapov authored
If a task switch caused by an event remove it from the event queue. VMX already does that. Signed-off-by:
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Andre Przywara authored
On AMD CPUs sometimes the DB bit in the stack segment descriptor is left as 1, although the whole segment has been made unusable. Clear it here to pass an Intel VMX entry check when cross vendor migrating. Signed-off-by:
Andre Przywara <andre.przywara@amd.com> Signed-off-by:
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Glauber Costa authored
Apparently nobody turned this on in a while... setting apic_debug to something compilable, generates some errors. This patch fixes it. Signed-off-by:
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Chris Wright authored
Remove extra tab. Signed-off-by:
Chris Wright <chrisw@redhat.com> Signed-off-by:
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Sheng Yang authored
Intel TXT(Trusted Execution Technology) required VMX off for all cpu to work when system shutdown. CC: Joseph Cihula <joseph.cihula@intel.com> Signed-off-by:
Sheng Yang <sheng@linux.intel.com> Signed-off-by:
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Sheng Yang authored
Memory aliases with different memory type is a problem for guest. For the guest without assigned device, the memory type of guest memory would always been the same as host(WB); but for the assigned device, some part of memory may be used as DMA and then set to uncacheable memory type(UC/WC), which would be a conflict of host memory type then be a potential issue. Snooping control can guarantee the cache correctness of memory go through the DMA engine of VT-d. [avi: fix build on ia64] Signed-off-by:
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Sheng Yang authored
Shadow_mt_mask is out of date, now it have only been used as a flag to indicate if TDP enabled. Get rid of it and use tdp_enabled instead. Also put memory type logical in kvm_x86_ops->get_mt_mask(). Signed-off-by:
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