- 05 Oct, 2012 28 commits
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Alexander Graf authored
We need to call kvm_guest_enter in booke and book3s, so move its call to generic code. Signed-off-by:Alexander Graf <agraf@suse.de>
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Alexander Graf authored
Today, we disable preemption while inside guest context, because we need to expose to the world that we are not in a preemptible context. However, during that time we already have interrupts disabled, which would indicate that we are in a non-preemptible context. The reason the checks for irqs_disabled() fail for us though is that we manually control hard IRQs and ignore all the lazy EE framework. Let's stop doing that. Instead, let's always use lazy EE to indicate when we want to disable IRQs, but do a special final switch that gets us into EE disabled, but soft enabled state. That way when we get back out of guest state, we are immediately ready to process interrupts. This simplifies the code drastically and reduces the time that we appear as preempt disabled. Signed-off-by: -
Alexander Graf authored
When getting out of __vcpu_run, let's be consistent about the state we return in. We want to always * have IRQs enabled * have called kvm_guest_exit before Signed-off-by: -
Alexander Graf authored
When going out of guest mode, indicate that we are in vcpu->mode. That way requests from other CPUs don't needlessly need to kick us to process them, because it'll just happen next time we enter the guest. Signed-off-by: -
Alexander Graf authored
The x86 implementation of KVM accounts for host time while processing guest exits. Do the same for us. Signed-off-by: -
Alexander Graf authored
Now that we use our generic exit helper, we can safely drop our previous kvm_resched that we used to trigger at the beginning of the exit handler function. Signed-off-by: -
Alexander Graf authored
We only need to set vcpu->mode to outside once. Signed-off-by: -
Alexander Graf authored
Now that we have very simple MMU Notifier support for e500 in place, also add the same simple support to book3s. It gets us one step closer to actual fast support. Signed-off-by: -
Alexander Graf authored
We need to do the same things when preparing to enter a guest for booke and book3s_pr cores. Fold the generic code into a generic function that both call. Signed-off-by: -
Alexander Graf authored
We only call kvmppc_check_requests() when vcpu->requests != 0, so drop the redundant check in the function itself Signed-off-by: -
Alexander Graf authored
Without trace points, debugging what exactly is going on inside guest code can be very tricky. Add a few more trace points at places that hopefully tell us more when things go wrong. Signed-off-by: -
Alexander Graf authored
The e500 target has lived without mmu notifiers ever since it got introduced, but fails for the user space check on them with hugetlbfs. So in order to get that one working, implement mmu notifiers in a reasonably dumb fashion and be happy. On embedded hardware, we almost never end up with mmu notifier calls, since most people don't overcommit. Signed-off-by: -
Alexander Graf authored
Generic KVM code might want to know whether we are inside guest context or outside. It also wants to be able to push us out of guest context. Add support to the BookE code for the generic vcpu->mode field that describes the above states. Signed-off-by: -
Alexander Graf authored
We need a central place to check for pending requests in. Add one that only does the timer check we already do in a different place. Later, this central function can be extended by more checks. Signed-off-by: -
Scott Wood authored
This fixes breakage introduced by the following commit: commit 6d2d82627f4f1e96a33664ace494fa363e0495cb Author: Liu Yu-B13201 <Yu.Liu@freescale.com> Date: Tue Jul 3 05:48:56 2012 +0000 PPC: Don't use hardcoded opcode for ePAPR hcall invocation when a driver that uses ePAPR hypercalls is built as a module. Reported-by:Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
Scott Wood <scottwood@freescale.com> Signed-off-by:
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Paul Mackerras authored
This is printed once for every RMA or HPT region that get preallocated. If one preallocates hundreds of such regions (in order to run hundreds of KVM guests), that gets rather painful, so make it a bit quieter. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Alexander Graf authored
Our mapping code assumes that TLB0 entries are always mapped. However, after calling clear_tlb_refs() this is no longer the case. Map them dynamically if we find an entry unmapped in TLB0. Signed-off-by: -
Alexander Graf authored
We're already counting remote TLB flushes in a variable, but don't export it to user space yet. Do so, so we know what's going on. Signed-off-by: -
Alexander Graf authored
Semantically, the "SYNC" cap means that we have mmu notifiers available. Express this in our #ifdef'ery around the feature, so that we can be sure we don't miss out on ppc targets when they get their implementation. Signed-off-by: -
Alexander Graf authored
We want to have tracing information on guest exits for booke as well as book3s. Since most information is identical, use a common trace point. Signed-off-by: -
Liu Yu-B13201 authored
Signed-off-by:
Liu Yu <yu.liu@freescale.com> Signed-off-by:
Stuart Yoder <stuart.yoder@freescale.com> Signed-off-by:
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Scott Wood authored
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Stuart Yoder authored
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Liu Yu-B13201 authored
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Varun Sethi <Varun.Sethi@freescale.com> Signed-off-by:
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Liu Yu-B13201 authored
And add a new flag definition in kvm_ppc_pvinfo to indicate whether the host supports the EV_IDLE hcall. Signed-off-by:
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Stuart Yoder authored
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Stuart Yoder authored
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Stuart Yoder authored
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- 27 Sep, 2012 1 commit
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Christian Borntraeger authored
Recent changes (KVM: make processes waiting on vcpu mutex killable) now requires to check the return value of vcpu_load. This triggered a warning in s390 specific kvm code. Turns out that we can actually remove the put/load, since schedule will do the right thing via the preempt notifiers. Reported-by:
Fengguang Wu <fengguang.wu@intel.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Avi Kivity <avi@redhat.com>
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- 23 Sep, 2012 2 commits
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Jan Kiszka authored
If we reset a vcpu on INIT, we so far overwrote dr7 as provided by KVM_SET_GUEST_DEBUG, and we also cleared switch_db_regs unconditionally. Fix this by saving the dr7 used for guest debugging and calculating the effective register value as well as switch_db_regs on any potential change. This will change to focus of the set_guest_debug vendor op to update_dp_bp_intercept. Found while trying to stop on start_secondary. Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
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Alex Williamson authored
To emulate level triggered interrupts, add a resample option to KVM_IRQFD. When specified, a new resamplefd is provided that notifies the user when the irqchip has been resampled by the VM. This may, for instance, indicate an EOI. Also in this mode, posting of an interrupt through an irqfd only asserts the interrupt. On resampling, the interrupt is automatically de-asserted prior to user notification. This enables level triggered interrupts to be posted and re-enabled from vfio with no userspace intervention. All resampling irqfds can make use of a single irq source ID, so we reserve a new one for this interface. Signed-off-by:
Alex Williamson <alex.williamson@redhat.com> Signed-off-by:
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- 20 Sep, 2012 9 commits
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Gleb Natapov authored
Most interrupt are delivered to only one vcpu. Use pre-build tables to find interrupt destination instead of looping through all vcpus. In case of logical mode loop only through vcpus in a logical cluster irq is sent to. Signed-off-by:
Gleb Natapov <gleb@redhat.com> Acked-by:
Michael S. Tsirkin <mst@redhat.com> Signed-off-by:
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Avi Kivity authored
* queue: KVM: MMU: Eliminate pointless temporary 'ac' KVM: MMU: Avoid access/dirty update loop if all is well KVM: MMU: Eliminate eperm temporary KVM: MMU: Optimize is_last_gpte() KVM: MMU: Simplify walk_addr_generic() loop KVM: MMU: Optimize pte permission checks KVM: MMU: Update accessed and dirty bits after guest pagetable walk KVM: MMU: Move gpte_access() out of paging_tmpl.h KVM: MMU: Optimize gpte_access() slightly KVM: MMU: Push clean gpte write protection out of gpte_access() KVM: clarify kvmclock documentation KVM: make processes waiting on vcpu mutex killable KVM: SVM: Make use of asm.h KVM: VMX: Make use of asm.h KVM: VMX: Make lto-friendly Signed-off-by: -
Avi Kivity authored
'ac' essentially reconstructs the 'access' variable we already have, except for the PFERR_PRESENT_MASK and PFERR_RSVD_MASK. As these are not used by callees, just use 'access' directly. Reviewed-by:
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by:
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Avi Kivity authored
Keep track of accessed/dirty bits; if they are all set, do not enter the accessed/dirty update loop. Reviewed-by:
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Avi Kivity authored
'eperm' is no longer used in the walker loop, so we can eliminate it. Reviewed-by:
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Avi Kivity authored
Instead of branchy code depending on level, gpte.ps, and mmu configuration, prepare everything in a bitmap during mode changes and look it up during runtime. Reviewed-by:
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Avi Kivity authored
The page table walk is coded as an infinite loop, with a special case on the last pte. Code it as an ordinary loop with a termination condition on the last pte (large page or walk length exhausted), and put the last pte handling code after the loop where it belongs. Reviewed-by:
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Avi Kivity authored
walk_addr_generic() permission checks are a maze of branchy code, which is performed four times per lookup. It depends on the type of access, efer.nxe, cr0.wp, cr4.smep, and in the near future, cr4.smap. Optimize this away by precalculating all variants and storing them in a bitmap. The bitmap is recalculated when rarely-changing variables change (cr0, cr4) and is indexed by the often-changing variables (page fault error code, pte access permissions). The permission check is moved to the end of the loop, otherwise an SMEP fault could be reported as a false positive, when PDE.U=1 but PTE.U=0. Noted by Xiao Guangrong. The result is short, branch-free code. Reviewed-by:
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Avi Kivity authored
While unspecified, the behaviour of Intel processors is to first perform the page table walk, then, if the walk was successful, to atomically update the accessed and dirty bits of walked paging elements. While we are not required to follow this exactly, doing so will allow us to perform the access permissions check after the walk is complete, rather than after each walk step. (the tricky case is SMEP: a zero in any pte's U bit makes the referenced page a supervisor page, so we can't fault on a one bit during the walk itself). Reviewed-by:
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