- 01 Oct, 2015 40 commits
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Feng Wu authored
This patch defines a new interface kvm_intr_is_single_vcpu(), which can returns whether the interrupt is for single-CPU or not. It is used by VT-d PI, since now we only support single-CPU interrupts, For lowest-priority interrupts, if user configures it via /proc/irq or uses irqbalance to make it single-CPU, we can use PI to deliver the interrupts to it. Full functionality of lowest-priority support will be added later. Signed-off-by:
Feng Wu <feng.wu@intel.com> Reviewed-by:
Alex Williamson <alex.williamson@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Feng Wu authored
This patch adds some helper functions to manipulate the Posted-Interrupts Descriptor. Signed-off-by:
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Feng Wu authored
Extend struct pi_desc for VT-d Posted-Interrupts. Signed-off-by:
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Feng Wu authored
This patch adds an arch specific hooks 'arch_update' in 'struct kvm_kernel_irqfd'. On Intel side, it is used to update the IRTE when VT-d posted-interrupts is used. Signed-off-by:
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Eric Auger authored
This patch adds the registration/unregistration of an irq_bypass_consumer on irqfd assignment/deassignment. Signed-off-by:
Eric Auger <eric.auger@linaro.org> Signed-off-by:
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Eric Auger authored
This patch introduces - kvm_arch_irq_bypass_add_producer - kvm_arch_irq_bypass_del_producer - kvm_arch_irq_bypass_stop - kvm_arch_irq_bypass_start They make possible to specialize the KVM IRQ bypass consumer in case CONFIG_KVM_HAVE_IRQ_BYPASS is set. Signed-off-by:
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Eric Auger authored
Move _irqfd_resampler and _irqfd struct declarations in a new public header: kvm_irqfd.h. They are respectively renamed into kvm_kernel_irqfd_resampler and kvm_kernel_irqfd. Those datatypes will be used by architecture specific code, in the context of IRQ bypass manager integration. Signed-off-by:
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Feng Wu authored
We need to build files in virt/lib/, which are now used by KVM and VFIO, so add virt directory to the top Makefile. Signed-off-by:
Michal Marek <mmarek@suse.com> Signed-off-by:
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Alex Williamson authored
When a physical I/O device is assigned to a virtual machine through facilities like VFIO and KVM, the interrupt for the device generally bounces through the host system before being injected into the VM. However, hardware technologies exist that often allow the host to be bypassed for some of these scenarios. Intel Posted Interrupts allow the specified physical edge interrupts to be directly injected into a guest when delivered to a physical processor while the vCPU is running. ARM IRQ Forwarding allows forwarded physical interrupts to be directly deactivated by the guest. The IRQ bypass manager here is meant to provide the shim to connect interrupt producers, generally the host physical device driver, with interrupt consumers, generally the hypervisor, in order to configure these bypass mechanism. To do this, we base the connection on a shared, opaque token. For KVM-VFIO this is expected to be an eventfd_ctx since this is the connection we already use to connect an eventfd to an irqfd on the in-kernel path. When a producer and consumer with matching tokens is found, callbacks via both registered participants allow the bypass facilities to be automatically enabled. Signed-off-by:
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Paolo Bonzini authored
This is friendlier to clients of the code, who are going to prepare vcpu_data structs unconditionally, even if CONFIG_IRQ_REMAP is not defined. Reviewed-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Radim Krčmář authored
Newer KVM won't be exposing PVCLOCK_COUNTS_FROM_ZERO anymore. The purpose of that flags was to start counting system time from 0 when the KVM clock has been initialized. We can achieve the same by selecting one read as the initial point. A simple subtraction will work unless the KVM clock count overflows earlier (has smaller width) than scheduler's cycle count. We should be safe till x86_128. Because PVCLOCK_COUNTS_FROM_ZERO was enabled only on new hypervisors, setting sched clock as stable based on PVCLOCK_TSC_STABLE_BIT might regress on older ones. I presume we don't need to change kvm_clock_read instead of introducing kvm_sched_clock_read. A problem could arise in case sched_clock is expected to return the same value as get_cycles, but we should have merged those clocks in that case. Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com> Acked-by:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
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Xiao Guangrong authored
Check cpuid bit instead of it Signed-off-by:
Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by:
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Xiao Guangrong authored
Use vmcs_set_bits() and vmcs_clear_bits() to clean up the code Signed-off-by:
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Xiao Guangrong authored
Unify the update in vmx_cpuid_update() Signed-off-by:
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Paolo Bonzini authored
The SECONDARY_EXEC_RDTSCP must be available iff RDTSCP is enabled in the guest. Signed-off-by: -
Xiao Guangrong authored
If vmx_invpcid_supported() is true, second execution control filed must be supported and SECONDARY_EXEC_ENABLE_INVPCID must have already been set in current vmcs by vmx_secondary_exec_control() If vmx_invpcid_supported() is false, no need to clear SECONDARY_EXEC_ENABLE_INVPCID Signed-off-by:
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Xiao Guangrong authored
if vmx_rdtscp_supported() is true SECONDARY_EXEC_RDTSCP must have already been set in current vmcs by vmx_secondary_exec_control() Signed-off-by:
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Xiao Guangrong authored
SECONDARY_EXEC_RDTSCP set for L2 guest comes from vmcs12 Signed-off-by:
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Xiao Guangrong authored
Pass PCOMMIT CPU feature to guest to enable PCOMMIT instruction Currently we do not catch pcommit instruction for L1 guest and allow L1 to catch this instruction for L2 if, as required by the spec, L1 can enumerate the PCOMMIT instruction via CPUID: | IA32_VMX_PROCBASED_CTLS2[53] (which enumerates support for the | 1-setting of PCOMMIT exiting) is always the same as | CPUID.07H:EBX.PCOMMIT[bit 22]. Thus, software can set PCOMMIT exiting | to 1 if and only if the PCOMMIT instruction is enumerated via CPUID The spec can be found at https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdfSigned-off-by:
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Xiao Guangrong authored
Pass these CPU features to guest to enable them in guest They are needed by nvdimm drivers Signed-off-by:
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Paolo Bonzini authored
Uniprocessor 32-bit randconfigs can disable the local APIC, and posted interrupts require reserving a vector on the LAPIC, so they are incompatible. Signed-off-by: -
Andrey Smetanin authored
HV_X64_MSR_VP_RUNTIME msr used by guest to get "the time the virtual processor consumes running guest code, and the time the associated logical processor spends running hypervisor code on behalf of that guest." Calculation of this time is performed by task_cputime_adjusted() for vcpu task. Necessary to support loading of winhv.sys in guest, which in turn is required to support Windows VMBus. Signed-off-by:
Andrey Smetanin <asmetanin@virtuozzo.com> Reviewed-by:
Roman Kagan <rkagan@virtuozzo.com> Signed-off-by:
Denis V. Lunev <den@openvz.org> CC: Paolo Bonzini <pbonzini@redhat.com> CC: Gleb Natapov <gleb@kernel.org> Signed-off-by:
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Andrey Smetanin authored
Insert Hyper-V HV_X64_MSR_VP_INDEX into msr's emulated list, so QEMU can set Hyper-V features cpuid HV_X64_MSR_VP_INDEX_AVAILABLE bit correctly. KVM emulation part is in place already. Necessary to support loading of winhv.sys in guest, which in turn is required to support Windows VMBus. Signed-off-by:
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Andrey Smetanin authored
HV_X64_MSR_RESET msr is used by Hyper-V based Windows guest to reset guest VM by hypervisor. Necessary to support loading of winhv.sys in guest, which in turn is required to support Windows VMBus. Signed-off-by:
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Jason Wang authored
Cc: Gleb Natapov <gleb@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
Jason Wang <jasowang@redhat.com> Signed-off-by:
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Jason Wang authored
Cc: Gleb Natapov <gleb@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
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Jason Wang authored
All fields of kvm_io_range were initialized or copied explicitly afterwards. So switch to use kmalloc(). Cc: Gleb Natapov <gleb@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by:
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Steve Rutherford authored
In order to enable userspace PIC support, the userspace PIC needs to be able to inject local interrupts even when the APICs are in the kernel. KVM_INTERRUPT now supports sending local interrupts to an APIC when APICs are in the kernel. The ready_for_interrupt_request flag is now only set when the CPU/APIC will immediately accept and inject an interrupt (i.e. APIC has not masked the PIC). When the PIC wishes to initiate an INTA cycle with, say, CPU0, it kicks CPU0 out of the guest, and renedezvous with CPU0 once it arrives in userspace. When the CPU/APIC unmasks the PIC, a KVM_EXIT_IRQ_WINDOW_OPEN is triggered, so that userspace has a chance to inject a PIC interrupt if it had been pending. Overall, this design can lead to a small number of spurious userspace renedezvous. In particular, whenever the PIC transistions from low to high while it is masked and whenever the PIC becomes unmasked while it is low. Note: this does not buffer more than one local interrupt in the kernel, so the VMM needs to enter the guest in order to complete interrupt injection before injecting an additional interrupt. Compiles for x86. Can pass the KVM Unit Tests. Signed-off-by:
Steve Rutherford <srutherford@google.com> Signed-off-by:
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Steve Rutherford authored
In order to support a userspace IOAPIC interacting with an in kernel APIC, the EOI exit bitmaps need to be configurable. If the IOAPIC is in userspace (i.e. the irqchip has been split), the EOI exit bitmaps will be set whenever the GSI Routes are configured. In particular, for the low MSI routes are reservable for userspace IOAPICs. For these MSI routes, the EOI Exit bit corresponding to the destination vector of the route will be set for the destination VCPU. The intention is for the userspace IOAPICs to use the reservable MSI routes to inject interrupts into the guest. This is a slight abuse of the notion of an MSI Route, given that MSIs classically bypass the IOAPIC. It might be worthwhile to add an additional route type to improve clarity. Compile tested for Intel x86. Signed-off-by:
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Steve Rutherford authored
Adds KVM_EXIT_IOAPIC_EOI which allows the kernel to EOI level-triggered IOAPIC interrupts. Uses a per VCPU exit bitmap to decide whether or not the IOAPIC needs to be informed (which is identical to the EOI_EXIT_BITMAP field used by modern x86 processors, but can also be used to elide kvm IOAPIC EOI exits on older processors). [Note: A prototype using ResampleFDs found that decoupling the EOI from the VCPU's thread made it possible for the VCPU to not see a recent EOI after reentering the guest. This does not match real hardware.] Compile tested for Intel x86. Signed-off-by:
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Steve Rutherford authored
First patch in a series which enables the relocation of the PIC/IOAPIC to userspace. Adds capability KVM_CAP_SPLIT_IRQCHIP; KVM_CAP_SPLIT_IRQCHIP enables the construction of LAPICs without the rest of the irqchip. Compile tested for x86. Signed-off-by:
Andrew Honig <ahonig@google.com> Signed-off-by:
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Paolo Bonzini authored
The interrupt window is currently checked twice, once in vmx.c/svm.c and once in dm_request_for_irq_injection. The only difference is the extra check for kvm_arch_interrupt_allowed in dm_request_for_irq_injection, and the different return value (EINTR/KVM_EXIT_INTR for vmx.c/svm.c vs. 0/KVM_EXIT_IRQ_WINDOW_OPEN for dm_request_for_irq_injection). However, dm_request_for_irq_injection is basically dead code! Revive it by removing the checks in vmx.c and svm.c's vmexit handlers, and fixing the returned values for the dm_request_for_irq_injection case. Signed-off-by: -
Paolo Bonzini authored
Avoid pointer chasing and memory barriers, and simplify the code when split irqchip (LAPIC in kernel, IOAPIC/PIC in userspace) is introduced. Signed-off-by: -
Paolo Bonzini authored
This will avoid an unnecessary trip to ->kvm and from there to the VPIC. Signed-off-by: -
Paolo Bonzini authored
We can reuse the algorithm that computes the EOI exit bitmap to figure out which vectors are handled by the IOAPIC. The only difference between the two is for edge-triggered interrupts other than IRQ8 that have no notifiers active; however, the IOAPIC does not have to do anything special for these interrupts anyway. This again limits the interactions between the IOAPIC and the LAPIC, making it easier to move the former to userspace. Inspired by a patch from Steve Rutherford. Signed-off-by: -
Paolo Bonzini authored
Do not compute TMR in advance. Instead, set the TMR just before the interrupt is accepted into the IRR. This limits the coupling between IOAPIC and LAPIC. Signed-off-by: -
Paolo Bonzini authored
The format of the role word has changed through the years and the plugin was never updated; some VMX exit reasons were missing too. Signed-off-by: -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPaolo Bonzini authored
This merges a cleanup of asm/apic.h, which is needed by the KVM patches to support VT-d posted interrupts. Signed-off-by: -
Dirk Müller authored
The cpu feature flags are not ever going to change, so warning everytime can cause a lot of kernel log spam (in our case more than 10GB/hour). The warning seems to only occur when nested virtualization is enabled, so it's probably triggered by a KVM bug. This is a sensible and safe change anyway, and the KVM bug fix might not be suitable for stable releases anyway. Cc: stable@vger.kernel.org Signed-off-by:
Dirk Mueller <dmueller@suse.com> Signed-off-by:
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Dirk Müller authored
The old one appears to be a generic catch all page, which is unhelpful. Signed-off-by:
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