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2013-02-13KVM: PPC: BookE: Handle alignment interruptsAlexander Graf1-1/+15
When the guest triggers an alignment interrupt, we don't handle it properly today and instead BUG_ON(). This really shouldn't happen. Instead, we should just pass the interrupt back into the guest so it can deal with it. Reported-by: Gao Guanhua-B22826 <B22826@freescale.com> Tested-by: Gao Guanhua-B22826 <B22826@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-02-13KVM: PPC: booke: Allow multiple exception typesBharat Bhushan1-5/+9
Current kvmppc_booke_handlers uses the same macro (KVM_HANDLER) and all handlers are considered to be the same size. This will not be the case if we want to use different macros for different handlers. This patch improves the kvmppc_booke_handler so that it can support different macros for different handlers. Signed-off-by: Liu Yu <yu.liu@freescale.com> [bharat.bhushan@freescale.com: Substantial changes] Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-01-10KVM: PPC: BookE: Add EPR ONE_REG syncAlexander Graf1-0/+21
We need to be able to read and write the contents of the EPR register from user space. This patch implements that logic through the ONE_REG API and declares its (never implemented) SREGS counterpart as deprecated. Signed-off-by: Alexander Graf <agraf@suse.de>
2013-01-10KVM: PPC: BookE: Implement EPR exitAlexander Graf1-1/+13
The External Proxy Facility in FSL BookE chips allows the interrupt controller to automatically acknowledge an interrupt as soon as a core gets its pending external interrupt delivered. Today, user space implements the interrupt controller, so we need to check on it during such a cycle. This patch implements logic for user space to enable EPR exiting, disable EPR exiting and EPR exiting itself, so that user space can acknowledge an interrupt when an external interrupt has successfully been delivered into the guest vcpu. Signed-off-by: Alexander Graf <agraf@suse.de>
2013-01-10KVM: PPC: BookE: Allow irq deliveries to inject requestsAlexander Graf1-0/+5
When injecting an interrupt into guest context, we usually don't need to check for requests anymore. At least not until today. With the introduction of EPR, we will have to create a request when the guest has successfully accepted an external interrupt though. So we need to prepare the interrupt delivery to abort guest entry gracefully. Otherwise we'd delay the EPR request. Signed-off-by: Alexander Graf <agraf@suse.de>
2012-12-06KVM: PPC: booke: Get/set guest EPCR register using ONE_REG interfaceMihai Caraman1-0/+14
Implement ONE_REG interface for EPCR register adding KVM_REG_PPC_EPCR to the list of ONE_REG PPC supported registers. Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com> [agraf: remove HV dependency, use get/put_user] Signed-off-by: Alexander Graf <agraf@suse.de>
2012-12-06KVM: PPC: bookehv: Add EPCR support in mtspr/mfspr emulationMihai Caraman1-0/+12
Add EPCR support in booke mtspr/mfspr emulation. EPCR register is defined only for 64-bit and HV categories, we will expose it at this point only to 64-bit virtual processors running on 64-bit HV hosts. Define a reusable setter function for vcpu's EPCR. Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com> [agraf: move HV dependency in the code] Signed-off-by: Alexander Graf <agraf@suse.de>
2012-12-06KVM: PPC: bookehv: Add guest computation mode for irq deliveryMihai Caraman1-1/+8
When delivering guest IRQs, update MSR computation mode according to guest interrupt computation mode found in EPCR. Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com> [agraf: remove HV dependency in the code] Signed-off-by: Alexander Graf <agraf@suse.de>
2012-12-06KVM: PPC: booke: Fix get_tb() compile error on 64-bitMihai Caraman1-0/+1
Include header file for get_tb() declaration. Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: set IN_GUEST_MODE before checking requestsScott Wood1-1/+0
Avoid a race as described in the code comment. Also remove a related smp_wmb() from booke's kvmppc_prepare_to_enter(). I can't see any reason for it, and the book3s_pr version doesn't have it. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: Book3S HV: Fix updates of vcpu->cpuPaul Mackerras1-0/+2
This removes the powerpc "generic" updates of vcpu->cpu in load and put, and moves them to the various backends. The reason is that "HV" KVM does its own sauce with that field and the generic updates might corrupt it. The field contains the CPU# of the -first- HW CPU of the core always for all the VCPU threads of a core (the one that's online from a host Linux perspective). However, the preempt notifiers are going to be called on the threads VCPUs when they are running (due to them sleeping on our private waitqueue) causing unload to be called, potentially clobbering the value. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: Book3S HV: Handle memory slot deletion and modification correctlyPaul Mackerras1-1/+6
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>
2012-10-05KVM: PPC: Move kvm->arch.slot_phys into memslot.archPaul Mackerras1-0/+12
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: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: BookE: Support FPU on non-hv systemsAlexander Graf1-0/+11
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 <agraf@suse.de>
2012-10-05booke: Added ONE_REG interface for IAC/DAC debug registersBharat Bhushan1-2/+46
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: Bharat Bhushan <bharat.bhushan@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: booke: Add watchdog emulationBharat Bhushan1-0/+155
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: Bharat Bhushan <bharat.bhushan@freescale.com> [agraf: adjust to new request framework] Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: Add return value to core_check_requestsAlexander Graf1-1/+5
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 <agraf@suse.de>
2012-10-05KVM: PPC: Add return value in prepare_to_enterAlexander Graf1-8/+8
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 <agraf@suse.de>
2012-10-05KVM: PPC: Move kvm_guest_enter call into generic codeAlexander Graf1-2/+0
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>
2012-10-05KVM: PPC: Book3S: PR: Rework irq disablingAlexander Graf1-0/+2
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 <agraf@suse.de>
2012-10-05KVM: PPC: Consistentify vcpu exit pathAlexander Graf1-5/+8
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 <agraf@suse.de>
2012-10-05KVM: PPC: Exit guest context while handling exitAlexander Graf1-0/+3
The x86 implementation of KVM accounts for host time while processing guest exits. Do the same for us. Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: BookE: Drop redundant vcpu->mode setAlexander Graf1-2/+0
We only need to set vcpu->mode to outside once. Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: Use same kvmppc_prepare_to_enter code for booke and book3s_prAlexander Graf1-57/+1
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 <agraf@suse.de>
2012-10-05KVM: PPC: BookE: No duplicate request != 0 checkAlexander Graf1-7/+5
We only call kvmppc_check_requests() when vcpu->requests != 0, so drop the redundant check in the function itself Signed-off-by: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: BookE: Add some more trace pointsAlexander Graf1-0/+3
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 <agraf@suse.de>
2012-10-05KVM: PPC: E500: Implement MMU notifiersAlexander Graf1-0/+6
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 <agraf@suse.de>
2012-10-05KVM: PPC: BookE: Add support for vcpu->modeAlexander Graf1-0/+11
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 <agraf@suse.de>
2012-10-05KVM: PPC: BookE: Add check_requests helper functionAlexander Graf1-7/+17
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: Alexander Graf <agraf@suse.de>
2012-10-05KVM: PPC: BookE: Expose remote TLB flushes in debugfsAlexander Graf1-0/+1
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 <agraf@suse.de>
2012-10-05KVM: PPC: PR: Use generic tracepoint for guest exitAlexander Graf1-0/+3
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: Alexander Graf <agraf@suse.de>
2012-07-11booke/bookehv: Add host crit-watchdog exception supportBharat Bhushan1-0/+21
Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2012-05-30KVM: PPC: booke: Added DECAR supportBharat Bhushan1-0/+5
Added the decrementer auto-reload support. DECAR is readable on e500v2/e500mc and later cpus. Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2012-04-08KVM: PPC: Ignore unhalt request from kvm_vcpu_blockAlexander Graf1-0/+1
When running kvm_vcpu_block and it realizes that the CPU is actually good to run, we get a request bit set for KVM_REQ_UNHALT. Right now, there's nothing we can do with that bit, so let's unset it right after the call again so we don't get confused in our later checks for pending work. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: Pass EA to updating emulation opsAlexander Graf1-0/+1
When emulating updating load/store instructions (lwzu, stwu, ...) we need to write the effective address of the load/store into a register. Currently, we write the physical address in there, which is very wrong. So instead let's save off where the virtual fault was on MMIO and use that information as value to put into the register. While at it, also move the XOP variants of the above instructions to the new scheme of using the already known vaddr instead of calculating it themselves. Reported-by: Jörg Sommer <joerg@alea.gnuu.de> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: Booke: only prepare to enter when we enterAlexander Graf1-8/+10
So far, we've always called prepare_to_enter even when all we did was return to the host. This patch changes that semantic to only call prepare_to_enter when we actually want to get back into the guest. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: Reinject performance monitor interruptsAlexander Graf1-0/+4
When we get a performance monitor interrupt, we need to make sure that the host receives it. So reinject it like we reinject the other host destined interrupts. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: expose good state on irq reinjectAlexander Graf1-15/+41
When reinjecting an interrupt into the host interrupt handler after we're back in host kernel land, we need to tell the kernel where the interrupt happened. We can't tell it that we were in guest state, because that might lead to random code walking host addresses. So instead, we tell it that we came from the interrupt reinject code. This helps getting reasonable numbers out of perf. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: Support perfmon interruptsAlexander Graf1-0/+4
When during guest context we get a performance monitor interrupt, we currently bail out and oops. Let's route it to its correct handler instead. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: add GS documentation for program interruptAlexander Graf1-2/+8
The comment for program interrupts triggered when using bookehv was misleading. Update it to mention why MSR_GS indicates that we have to inject an interrupt into the guest again, not emulate it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: Readd debug abort code for machine checkAlexander Graf1-1/+6
When during guest execution we get a machine check interrupt, we don't know how to handle it yet. So let's add the error printing code back again that we dropped accidently earlier and tell user space that something went really wrong. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: BOOKE_IRQPRIO_MAX is n+1Alexander Graf1-1/+1
The semantics of BOOKE_IRQPRIO_MAX changed to denote the highest available irqprio + 1, so let's reflect that in the code too. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: rework rescheduling checksAlexander Graf1-22/+50
Instead of checking whether we should reschedule only when we exited due to an interrupt, let's always check before entering the guest back again. This gets the target more in line with the other archs. Also while at it, generalize the whole thing so that eventually we could have a single kvmppc_prepare_to_enter function for all ppc targets that does signal and reschedule checking for us. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: deliver program int on emulation failureAlexander Graf1-1/+1
When we fail to emulate an instruction for the guest, we better go in and tell it that we failed to emulate it, by throwing an illegal instruction exception. Please beware that we basically never get around to telling the guest that we failed thanks to the debugging code right above it. If user space however decides that it wants to ignore the debug, we would at least do "the right thing" afterwards. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: remove leftover debuggingAlexander Graf1-5/+0
The e500mc patches left some debug code in that we don't need. Remove it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: rename CONFIG_KVM_E500 -> CONFIG_KVM_E500V2Alexander Graf1-1/+1
The CONFIG_KVM_E500 option really indicates that we're running on a V2 machine, not on a machine of the generic E500 class. So indicate that properly and change the config name accordingly. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: e500mc: implicitly set MSR_GSAlexander Graf1-6/+5
When setting MSR for an e500mc guest, we implicitly always set MSR_GS to make sure the guest is in guest state. Since we have this implicit rule there, we don't need to explicitly pass MSR_GS to set_msr(). Remove all explicit setters of MSR_GS. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: e500mc: Add doorbell emulation supportAlexander Graf1-0/+2
When one vcpu wants to kick another, it can issue a special IPI instruction called msgsnd. This patch emulates this instruction, its clearing counterpart and the infrastructure required to actually trigger that interrupt inside a guest vcpu. With this patch, SMP guests on e500mc work. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: standard PPC floating point supportScott Wood1-0/+44
e500mc has a normal PPC FPU, rather than SPE which is found on e500v1/v2. Based on code from Liu Yu <yu.liu@freescale.com>. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08KVM: PPC: booke: category E.HV (GS-mode) supportScott Wood1-56/+253
Chips such as e500mc that implement category E.HV in Power ISA 2.06 provide hardware virtualization features, including a new MSR mode for guest state. The guest OS can perform many operations without trapping into the hypervisor, including transitions to and from guest userspace. Since we can use SRR1[GS] to reliably tell whether an exception came from guest state, instead of messing around with IVPR, we use DO_KVM similarly to book3s. Current issues include: - Machine checks from guest state are not routed to the host handler. - The guest can cause a host oops by executing an emulated instruction in a page that lacks read permission. Existing e500/4xx support has the same problem. Includes work by Ashish Kalra <Ashish.Kalra@freescale.com>, Varun Sethi <Varun.Sethi@freescale.com>, and Liu Yu <yu.liu@freescale.com>. Signed-off-by: Scott Wood <scottwood@freescale.com> [agraf: remove pt_regs usage] Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
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