- 14 Oct, 2015 6 commits
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Radim Krčmář authored
On real hardware, edge-triggered interrupts don't set a bit in TMR, which means that IOAPIC isn't notified on EOI. Do the same here. Staying in guest/kernel mode after edge EOI is what we want for most devices. If some bugs could be nicely worked around with edge EOI notifications, we should invest in a better interface. Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Radim Krčmář authored
KVM uses eoi_exit_bitmap to track vectors that need an action on EOI. The problem is that IOAPIC can be reconfigured while an interrupt with old configuration is pending and eoi_exit_bitmap only remembers the newest configuration; thus EOI from the pending interrupt is not recognized. (Reconfiguration is not a problem for level interrupts, because IOAPIC sends interrupt with the new configuration.) For an edge interrupt with ACK notifiers, like i8254 timer; things can happen in this order 1) IOAPIC inject a vector from i8254 2) guest reconfigures that vector's VCPU and therefore eoi_exit_bitmap on original VCPU gets cleared 3) guest's handler for the vector does EOI 4) KVM's EOI handler doesn't pass that vector to IOAPIC because it is not in that VCPU's eoi_exit_bitmap 5) i8254 stops working A simple solution is to set the IOAPIC vector in eoi_exit_bitmap if the vector is in PIR/IRR/ISR. This creates an unwanted situation if the vector is reused by a non-IOAPIC source, but I think it is so rare that we don't want to make the solution more sophisticated. The simple solution also doesn't work if we are reconfiguring the vector. (Shouldn't happen in the wild and I'd rather fix users of ACK notifiers instead of working around that.) The are no races because ioapic injection and reconfig are locked. Fixes: b053b2ae ("KVM: x86: Add EOI exit bitmap inference") [Before b053b2ae, this bug happened only with APICv.] Fixes: c7c9c56c ("x86, apicv: add virtual interrupt delivery support") Cc: <stable@vger.kernel.org> Signed-off-by: -
Radim Krčmář authored
After moving PIR to IRR, the interrupt needs to be delivered manually. Reported-by:
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Paolo Bonzini authored
Merge more important SMM fixes.
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Paolo Bonzini authored
In order to get into 64-bit protected mode, you need to enable paging while EFER.LMA=1. For this to work, CS.L must be 0. Currently, we load the segments before CR0 and CR4, which means that if RSM returns into 64-bit protected mode CS.L is already 1 and everything breaks. Luckily, CS.L=0 is always the case when executing RSM, because it is forbidden to execute RSM from 64-bit protected mode. Hence it is enough to load CR0 and CR4 first, and only then the segments. Fixes: 660a5d51 Cc: stable@vger.kernel.org Signed-off-by:
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Paolo Bonzini authored
Unfortunately I only noticed this after pushing. Fixes: f0d648bd Cc: stable@vger.kernel.org Signed-off-by:
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- 13 Oct, 2015 16 commits
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Paolo Bonzini authored
This merge brings in a couple important SMM fixes, which makes it easier to test latest KVM with unrestricted_guest=0 and to test the in-progress work on SMM support in the firmware. Conflicts: arch/x86/kvm/x86.c
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Paolo Bonzini authored
An SMI to a halted VCPU must wake it up, hence a VCPU with a pending SMI must be considered runnable. Fixes: 64d60670 Cc: stable@vger.kernel.org Signed-off-by:
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Paolo Bonzini authored
Split the huge conditional in two functions. Fixes: 64d60670 Cc: stable@vger.kernel.org Reviewed-by:
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Paolo Bonzini authored
Otherwise, two copies (one of them never populated and thus bogus) are allocated for the regular and SMM address spaces. This breaks SMM with EPT but without unrestricted guest support, because the SMM copy of the identity page map is all zeros. By moving the allocation to the caller we also remove the last vestiges of kernel-allocated memory regions (not accessible anymore in userspace since commit b74a07be, "KVM: Remove kernel-allocated memory regions", 2010-06-21); that is a nice bonus. Reported-by:
Alexandre DERUMIER <aderumier@odiso.com> Cc: stable@vger.kernel.org Fixes: 9da0e4d5Reviewed-by:
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Paolo Bonzini authored
The next patch will make x86_set_memory_region fill the userspace_addr. Since the struct is not used untouched anymore, it makes sense to build it in x86_set_memory_region directly; it also simplifies the callers. Reported-by:
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Paolo Bonzini authored
Merge tag 'kvm-s390-next-20151013' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Fixes for 4.4 A bunch of fixes and optimizations for interrupt and time handling. No fix is important enough to qualify for 4.3 or stable.
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David Hildenbrand authored
Let's factor this out and always use get_tod_clock_fast() when reading the guest TOD. STORE CLOCK FAST does not do serialization and, therefore, might result in some fuzziness between different processors in a way that subsequent calls on different CPUs might have time stamps that are earlier. This semantics is fine though for all KVM use cases. To make it obvious that the new function has STORE CLOCK FAST semantics we name it kvm_s390_get_tod_clock_fast. With this patch, we only have a handful of places were we have to care about STP sync (using preempt_disable() logic). Reviewed-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by:
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David Hildenbrand authored
Let's move that whole logic into one function. We now always use unsigned values when calculating the epoch (to avoid over/underflow defined). Also, we always have to get all VCPUs out of SIE before doing the update to avoid running differing VCPUs with different TODs. Acked-by:
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David Hildenbrand authored
Nobody except early.c makes use of store_tod_clock() to handle the cc. So if we would get a cc != 0, we would be in more trouble. Let's replace all users with get_tod_clock(). Returning a cc on an ioctl sounded strange either way. We can now also easily move the get_tod_clock() call into the preempt_disable() section. This is in fact necessary to make the STP sync work as expected. Otherwise the host TOD could change and we would end up with a wrong epoch calculation. Reviewed-by:
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David Hildenbrand authored
PER events can always co-exist with other program interrupts. For now, we always overwrite all program interrupt parameters when injecting any type of program interrupt. Let's handle that correctly by only overwriting the relevant portion of the program interrupt parameters. Therefore we can now inject PER events and ordinary program interrupts concurrently, resulting in no loss of program interrupts. This will especially by helpful when manually detecting PER events later - as both types might be triggered during one SIE exit. Reviewed-by:
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David Hildenbrand authored
The main reason to keep program injection in kernel separated until now was that we were able to do some checking, if really only the owning thread injects program interrupts (via waitqueue_active(li->wq)). This BUG_ON was never triggered and the chances of really hitting it, if another thread injected a program irq to another vcpu, were very small. Let's drop this check and turn kvm_s390_inject_program_int() and kvm_s390_inject_prog_irq() into simple inline functions that makes use of kvm_s390_inject_vcpu(). __must_check can be dropped as they are implicitely given by kvm_s390_inject_vcpu(), to avoid ugly long function prototypes. Reviewed-by:
Jens Freimann <jfrei@linux.vnet.ibm.com> Acked-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by:
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David Hildenbrand authored
Let's get rid of the local variable and exit directly if we found any pending interrupt. This is not only faster, but also better readable. Reviewed-by:
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David Hildenbrand authored
We can remove that double check. Reviewed-by:
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David Hildenbrand authored
No need to separate pending and floating irqs when setting interception requests. Let's do it for all equally. Reviewed-by:
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David Hildenbrand authored
We don't care about program event recording irqs (synchronous program irqs) but asynchronous irqs when checking for disabled wait. Machine checks were missing. Let's directly switch to the functions we have for that purpose instead of testing once again for magic bits. Reviewed-by:
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Christian Borntraeger authored
the float int structure is no longer used in __inject_vm. Acked-by:
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- 01 Oct, 2015 18 commits
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Feng Wu authored
Enable VT-d Posted-Interrtups and add a command line parameter for it. Signed-off-by:
Feng Wu <feng.wu@intel.com> Reviewed-by:
Alex Williamson <alex.williamson@redhat.com> Acked-by:
Joerg Roedel <joro@8bytes.org> Signed-off-by:
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Feng Wu authored
This patch updates the Posted-Interrupts Descriptor when vCPU is blocked. pre-block: - Add the vCPU to the blocked per-CPU list - Set 'NV' to POSTED_INTR_WAKEUP_VECTOR post-block: - Remove the vCPU from the per-CPU list Signed-off-by:
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Feng Wu authored
This patch updates the Posted-Interrupts Descriptor when vCPU is preempted. sched out: - Set 'SN' to suppress furture non-urgent interrupts posted for the vCPU. sched in: - Clear 'SN' - Change NDST if vCPU is scheduled to a different CPU - Set 'NV' to POSTED_INTR_VECTOR Signed-off-by:
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Feng Wu authored
Select IRQ_BYPASS_MANAGER for x86 when CONFIG_KVM is set Signed-off-by:
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Feng Wu authored
This patch adds the routine to update IRTE for posted-interrupts when guest changes the interrupt configuration. Signed-off-by:
Fengguang Wu <fengguang.wu@intel.com> [Squashed in automatically generated patch from the build robot "KVM: x86: vcpu_to_pi_desc() can be static" - Paolo] Signed-off-by:
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Feng Wu authored
This patch adds the registration/unregistration of an irq_bypass_producer for MSI/MSIx on vfio pci devices. Acked-by:
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Feng Wu authored
Make kvm_set_msi_irq() public, we can use this function outside. Signed-off-by:
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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:
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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:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
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