- 05 Oct, 2012 40 commits
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Paul Mackerras authored
This adds an implementation of kvm_arch_flush_shadow_memslot for Book3S HV, and arranges for kvmppc_core_commit_memory_region to flush the dirty log when modifying an existing slot. With this, we can handle deletion and modification of memory slots. kvm_arch_flush_shadow_memslot calls kvmppc_core_flush_memslot, which on Book3S HV now traverses the reverse map chains to remove any HPT (hashed page table) entries referring to pages in the memslot. This gets called by generic code whenever deleting a memslot or changing the guest physical address for a memslot. We flush the dirty log in kvmppc_core_commit_memory_region for consistency with what x86 does. We only need to flush when an existing memslot is being modified, because for a new memslot the rmap array (which stores the dirty bits) is all zero, meaning that every page is considered clean already, and when deleting a memslot we obviously don't care about the dirty bits any more. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
Alexander Graf <agraf@suse.de>
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Paul Mackerras authored
Now that we have an architecture-specific field in the kvm_memory_slot structure, we can use it to store the array of page physical addresses that we need for Book3S HV KVM on PPC970 processors. This reduces the size of struct kvm_arch for Book3S HV, and also reduces the size of struct kvm_arch_memory_slot for other PPC KVM variants since the fields in it are now only compiled in for Book3S HV. This necessitates making the kvm_arch_create_memslot and kvm_arch_free_memslot operations specific to each PPC KVM variant. That in turn means that we now don't allocate the rmap arrays on Book3S PR and Book E. Since we now unpin pages and free the slot_phys array in kvmppc_core_free_memslot, we no longer need to do it in kvmppc_core_destroy_vm, since the generic code takes care to free all the memslots when destroying a VM. We now need the new memslot to be passed in to kvmppc_core_prepare_memory_region, since we need to initialize its arch.slot_phys member on Book3S HV. Signed-off-by:
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Paul Mackerras authored
The generic KVM code uses SRCU (sleeping RCU) to protect accesses to the memslots data structures against updates due to userspace adding, modifying or removing memory slots. We need to do that too, both to avoid accessing stale copies of the memslots and to avoid lockdep warnings. This therefore adds srcu_read_lock/unlock pairs around code that accesses and uses memslots. Since the real-mode handlers for H_ENTER, H_REMOVE and H_BULK_REMOVE need to access the memslots, and we don't want to call the SRCU code in real mode (since we have no assurance that it would only access the linear mapping), we hold the SRCU read lock for the VM while in the guest. This does mean that adding or removing memory slots while some vcpus are executing in the guest will block for up to two jiffies. This tradeoff is acceptable since adding/removing memory slots only happens rarely, while H_ENTER/H_REMOVE/H_BULK_REMOVE are performance-critical hot paths. Signed-off-by:
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Mihai Caraman authored
The current form of DO_KVM macro restricts its use to one call per input parameter set. This is caused by kvmppc_resume_\intno\()_\srr1 symbol definition. Duplicate calls of DO_KVM are required by distinct implementations of exeption handlers which are delegated at runtime. Use a rare label number to avoid conflicts with the calling contexts. Signed-off-by:
Mihai Caraman <mihai.caraman@freescale.com> Signed-off-by:
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Alexander Graf authored
When running on HV aware hosts, we can not trap when the guest sets the FP bit, so we just let it do so when it wants to, because it has full access to MSR. For non-HV aware hosts with an FPU (like 440), we need to also adjust the shadow MSR though. Otherwise the guest gets an FP unavailable trap even when it really enabled the FP bit in MSR. Signed-off-by: -
Alexander Graf authored
We need mfdcrx to execute properly on 460 cores. Signed-off-by: -
Alexander Graf authored
We need mtdcrx to execute properly on 460 cores. Signed-off-by: -
Bharat Bhushan authored
Patch to access the debug registers (IACx/DACx) using ONE_REG api was sent earlier. But that missed the respective documentation. Also corrected the index number referencing in section 4.69 Signed-off-by:
Bharat Bhushan <bharat.bhushan@freescale.com> Signed-off-by:
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Alexander Graf authored
Since we always mark pages as dirty immediately when mapping them read/write now, there's no need for the dirty flag in our cache. Signed-off-by: -
Alexander Graf authored
Exit traces are a lot easier to read when you don't have to remember cryptic numbers for guest exit reasons. Symbolify them in our trace output. Signed-off-by: -
Alexander Graf authored
Add support for the MCSR SPR. This only implements the SPR storage bits, not actual machine checks. Signed-off-by: -
Alexander Graf authored
We need to make sure that vcpu->arch.pvr is initialized to a sane value, so let's just take the host PVR. Signed-off-by: -
Bharat Bhushan authored
IAC/DAC are defined as 32 bit while they are 64 bit wide. So ONE_REG interface is added to set/get them. Signed-off-by:
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Bharat Bhushan authored
This patch adds the watchdog emulation in KVM. The watchdog emulation is enabled by KVM_ENABLE_CAP(KVM_CAP_PPC_BOOKE_WATCHDOG) ioctl. The kernel timer are used for watchdog emulation and emulates h/w watchdog state machine. On watchdog timer expiry, it exit to QEMU if TCR.WRC is non ZERO. QEMU can reset/shutdown etc depending upon how it is configured. Signed-off-by:
Liu Yu <yu.liu@freescale.com> Signed-off-by:
Scott Wood <scottwood@freescale.com> [bharat.bhushan@freescale.com: reworked patch] Signed-off-by:
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Alexander Graf authored
Requests may want to tell us that we need to go back into host state, so add a return value for the checks. Signed-off-by: -
Alexander Graf authored
Our prepare_to_enter helper wants to be able to return in more circumstances to the host than only when an interrupt is pending. Broaden the interface a bit and move even more generic code to the generic helper. Signed-off-by: -
Alexander Graf authored
We don't need to do anything when mode is EXITING_GUEST_MODE, because we essentially are outside of guest mode and did everything it asked us to do by the time we check it. Signed-off-by: -
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 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:
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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:
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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:
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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