- 17 Oct, 2013 15 commits
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Paul Mackerras authored
Currently PR-style KVM keeps the volatile guest register values (R0 - R13, CR, LR, CTR, XER, PC) in a shadow_vcpu struct rather than the main kvm_vcpu struct. For 64-bit, the shadow_vcpu exists in two places, a kmalloc'd struct and in the PACA, and it gets copied back and forth in kvmppc_core_vcpu_load/put(), because the real-mode code can't rely on being able to access the kmalloc'd struct. This changes the code to copy the volatile values into the shadow_vcpu as one of the last things done before entering the guest. Similarly the values are copied back out of the shadow_vcpu to the kvm_vcpu immediately after exiting the guest. We arrange for interrupts to be still disabled at this point so that we can't get preempted on 64-bit and end up copying values from the wrong PACA. This means that the accessor functions in kvm_book3s.h for these registers are greatly simplified, and are same between PR and HV KVM. In places where accesses to shadow_vcpu fields are now replaced by accesses to the kvm_vcpu, we can also remove the svcpu_get/put pairs. Finally, on 64-bit, we don't need the kmalloc'd struct at all any more. With this, the time to read the PVR one million times in a loop went from 567.7ms to 575.5ms (averages of 6 values), an increase of about 1.4% for this worse-case test for guest entries and exits. The standard deviation of the measurements is about 11ms, so the difference is only marginally significant statistically. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
Alexander Graf <agraf@suse.de>
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Paul Mackerras authored
Commit 9d1ffdd8 ("KVM: PPC: Book3S PR: Don't corrupt guest state when kernel uses VMX") added a call to kvmppc_load_up_altivec() that isn't guarded by CONFIG_ALTIVEC, causing a link failure when building a kernel without CONFIG_ALTIVEC set. This adds an #ifdef to fix this. Signed-off-by:
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Paul Mackerras authored
If we come out of a guest with an interrupt that we don't know about, instead of crashing the host with a BUG(), we now return to userspace with the exit reason set to KVM_EXIT_UNKNOWN and the trap vector in the hw.hardware_exit_reason field of the kvm_run structure, as is done on x86. Note that run->exit_reason is already set to KVM_EXIT_UNKNOWN at the beginning of kvmppc_handle_exit(). Signed-off-by:
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Paul Mackerras authored
This enables us to use the Processor Compatibility Register (PCR) on POWER7 to put the processor into architecture 2.05 compatibility mode when running a guest. In this mode the new instructions and registers that were introduced on POWER7 are disabled in user mode. This includes all the VSX facilities plus several other instructions such as ldbrx, stdbrx, popcntw, popcntd, etc. To select this mode, we have a new register accessible through the set/get_one_reg interface, called KVM_REG_PPC_ARCH_COMPAT. Setting this to zero gives the full set of capabilities of the processor. Setting it to one of the "logical" PVR values defined in PAPR puts the vcpu into the compatibility mode for the corresponding architecture level. The supported values are: 0x0f000002 Architecture 2.05 (POWER6) 0x0f000003 Architecture 2.06 (POWER7) 0x0f100003 Architecture 2.06+ (POWER7+) Since the PCR is per-core, the architecture compatibility level and the corresponding PCR value are stored in the struct kvmppc_vcore, and are therefore shared between all vcpus in a virtual core. Signed-off-by:
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Paul Mackerras authored
POWER7 and later IBM server processors have a register called the Program Priority Register (PPR), which controls the priority of each hardware CPU SMT thread, and affects how fast it runs compared to other SMT threads. This priority can be controlled by writing to the PPR or by use of a set of instructions of the form or rN,rN,rN which are otherwise no-ops but have been defined to set the priority to particular levels. This adds code to context switch the PPR when entering and exiting guests and to make the PPR value accessible through the SET/GET_ONE_REG interface. When entering the guest, we set the PPR as late as possible, because if we are setting a low thread priority it will make the code run slowly from that point on. Similarly, the first-level interrupt handlers save the PPR value in the PACA very early on, and set the thread priority to the medium level, so that the interrupt handling code runs at a reasonable speed. Acked-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Paul Mackerras authored
This adds the ability to have a separate LPCR (Logical Partitioning Control Register) value relating to a guest for each virtual core, rather than only having a single value for the whole VM. This corresponds to what real POWER hardware does, where there is a LPCR per CPU thread but most of the fields are required to have the same value on all active threads in a core. The per-virtual-core LPCR can be read and written using the GET/SET_ONE_REG interface. Userspace can can only modify the following fields of the LPCR value: DPFD Default prefetch depth ILE Interrupt little-endian TC Translation control (secondary HPT hash group search disable) We still maintain a per-VM default LPCR value in kvm->arch.lpcr, which contains bits relating to memory management, i.e. the Virtualized Partition Memory (VPM) bits and the bits relating to guest real mode. When this default value is updated, the update needs to be propagated to the per-vcore values, so we add a kvmppc_update_lpcr() helper to do that. Signed-off-by:
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Paul Mackerras authored
This makes the VRSAVE register value for a vcpu accessible through the GET/SET_ONE_REG interface on Book E systems (in addition to the existing GET/SET_SREGS interface), for consistency with Book 3S. Signed-off-by:
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Paul Mackerras authored
The yield count in the VPA is supposed to be incremented every time we enter the guest, and every time we exit the guest, so that its value is even when the vcpu is running in the guest and odd when it isn't. However, it's currently possible that we increment the yield count on the way into the guest but then find that other CPU threads are already exiting the guest, so we go back to nap mode via the secondary_too_late label. In this situation we don't increment the yield count again, breaking the relationship between the LSB of the count and whether the vcpu is in the guest. To fix this, we move the increment of the yield count to a point after we have checked whether other CPU threads are exiting. Signed-off-by:
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Paul Mackerras authored
This moves the code in book3s_hv_rmhandlers.S that reads any pending interrupt from the XICS interrupt controller, and works out whether it is an IPI for the guest, an IPI for the host, or a device interrupt, into a new function called kvmppc_read_intr. Later patches will need this. Signed-off-by:
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Paul Mackerras authored
We have two paths into and out of the low-level guest entry and exit code: from a vcpu task via kvmppc_hv_entry_trampoline, and from the system reset vector for an offline secondary thread on POWER7 via kvm_start_guest. Currently both just branch to kvmppc_hv_entry to enter the guest, and on guest exit, we test the vcpu physical thread ID to detect which way we came in and thus whether we should return to the vcpu task or go back to nap mode. In order to make the code flow clearer, and to keep the code relating to each flow together, this turns kvmppc_hv_entry into a subroutine that follows the normal conventions for call and return. This means that kvmppc_hv_entry_trampoline() and kvmppc_hv_entry() now establish normal stack frames, and we use the normal stack slots for saving return addresses rather than local_paca->kvm_hstate.vmhandler. Apart from that this is mostly moving code around unchanged. Signed-off-by:
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Paul Mackerras authored
The H_CONFER hypercall is used when a guest vcpu is spinning on a lock held by another vcpu which has been preempted, and the spinning vcpu wishes to give its timeslice to the lock holder. We implement this in the straightforward way using kvm_vcpu_yield_to(). Signed-off-by:
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Paul Mackerras authored
The VRSAVE register value for a vcpu is accessible through the GET/SET_SREGS interface for Book E processors, but not for Book 3S processors. In order to make this accessible for Book 3S processors, this adds a new register identifier for GET/SET_ONE_REG, and adds the code to implement it. Signed-off-by:
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Paul Mackerras authored
This allows guests to have a different timebase origin from the host. This is needed for migration, where a guest can migrate from one host to another and the two hosts might have a different timebase origin. However, the timebase seen by the guest must not go backwards, and should go forwards only by a small amount corresponding to the time taken for the migration. Therefore this provides a new per-vcpu value accessed via the one_reg interface using the new KVM_REG_PPC_TB_OFFSET identifier. This value defaults to 0 and is not modified by KVM. On entering the guest, this value is added onto the timebase, and on exiting the guest, it is subtracted from the timebase. This is only supported for recent POWER hardware which has the TBU40 (timebase upper 40 bits) register. Writing to the TBU40 register only alters the upper 40 bits of the timebase, leaving the lower 24 bits unchanged. This provides a way to modify the timebase for guest migration without disturbing the synchronization of the timebase registers across CPU cores. The kernel rounds up the value given to a multiple of 2^24. Timebase values stored in KVM structures (struct kvm_vcpu, struct kvmppc_vcore, etc.) are stored as host timebase values. The timebase values in the dispatch trace log need to be guest timebase values, however, since that is read directly by the guest. This moves the setting of vcpu->arch.dec_expires on guest exit to a point after we have restored the host timebase so that vcpu->arch.dec_expires is a host timebase value. Signed-off-by:
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Paul Mackerras authored
Currently we are not saving and restoring the SIAR and SDAR registers in the PMU (performance monitor unit) on guest entry and exit. The result is that performance monitoring tools in the guest could get false information about where a program was executing and what data it was accessing at the time of a performance monitor interrupt. This fixes it by saving and restoring these registers along with the other PMU registers on guest entry/exit. This also provides a way for userspace to access these values for a vcpu via the one_reg interface. Signed-off-by:
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Michael Neuling authored
This reserves space in get/set_one_reg ioctl for the extra guest state needed for POWER8. It doesn't implement these at all, it just reserves them so that the ABI is defined now. A few things to note here: - This add *a lot* state for transactional memory. TM suspend mode, this is unavoidable, you can't simply roll back all transactions and store only the checkpointed state. I've added this all to get/set_one_reg (including GPRs) rather than creating a new ioctl which returns a struct kvm_regs like KVM_GET_REGS does. This means we if we need to extract the TM state, we are going to need a bucket load of IOCTLs. Hopefully most of the time this will not be needed as we can look at the MSR to see if TM is active and only grab them when needed. If this becomes a bottle neck in future we can add another ioctl to grab all this state in one go. - The TM state is offset by 0x80000000. - For TM, I've done away with VMX and FP and created a single 64x128 bit VSX register space. - I've left a space of 1 (at 0x9c) since Paulus needs to add a value which applies to POWER7 as well. Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
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- 16 Oct, 2013 2 commits
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git://git.linaro.org/people/cdall/linux-kvm-armGleb Natapov authored
Updates for KVM/ARM including cpu=host and Cortex-A7 support
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Christoffer Dall authored
Some strange character leaped into the documentation, which makes git-send-email behave quite strangely. Get rid of this before it bites anyone else. Cc: Anup Patel <anup.patel@linaro.org> Signed-off-by:Christoffer Dall <christoffer.dall@linaro.org>
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- 15 Oct, 2013 1 commit
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chai wen authored
Page pinning is not mandatory in kvm async page fault processing since after async page fault event is delivered to a guest it accesses page once again and does its own GUP. Drop the FOLL_GET flag in GUP in async_pf code, and do some simplifying in check/clear processing. Suggested-by:
Gleb Natapov <gleb@redhat.com> Signed-off-by:
Gu zheng <guz.fnst@cn.fujitsu.com> Signed-off-by:
chai wen <chaiw.fnst@cn.fujitsu.com> Signed-off-by:
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- 14 Oct, 2013 7 commits
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Christoffer Dall authored
Now when the main kvm code relying on these defines has been moved to the x86 specific part of the world, we can get rid of these. Signed-off-by:
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Christoffer Dall authored
Now when the main kvm code relying on these defines has been moved to the x86 specific part of the world, we can get rid of these. Signed-off-by:
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Christoffer Dall authored
Now when the main kvm code relying on these defines has been moved to the x86 specific part of the world, we can get rid of these. Signed-off-by:
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Christoffer Dall authored
Now when the main kvm code relying on these defines has been moved to the x86 specific part of the world, we can get rid of these. Signed-off-by:
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Christoffer Dall authored
Now when the main kvm code relying on these defines has been moved to the x86 specific part of the world, we can get rid of these. Signed-off-by:
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Christoffer Dall authored
The KVM_HPAGE_DEFINES are a little artificial on ARM, since the huge page size is statically defined at compile time and there is only a single huge page size. Now when the main kvm code relying on these defines has been moved to the x86 specific part of the world, we can get rid of these. Signed-off-by:
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Christoffer Dall authored
The gfn_to_index function relies on huge page defines which either may not make sense on systems that don't support huge pages or are defined in an unconvenient way for other architectures. Since this is x86-specific, move the function to arch/x86/include/asm/kvm_host.h. Signed-off-by:
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- 13 Oct, 2013 3 commits
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Jonathan Austin authored
This patch adds support for running Cortex-A7 guests on Cortex-A7 hosts. As Cortex-A7 is architecturally compatible with A15, this patch is largely just generalising existing code. Areas where 'implementation defined' behaviour is identical for A7 and A15 is moved to allow it to be used by both cores. The check to ensure that coprocessor register tables are sorted correctly is also moved in to 'common' code to avoid each new cpu doing its own check (and possibly forgetting to do so!) Signed-off-by:
Jonathan Austin <jonathan.austin@arm.com> Acked-by:
Marc Zyngier <marc.zyngier@arm.com> Signed-off-by:
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Jonathan Austin authored
The T{0,1}SZ fields of TTBCR are 3 bits wide when using the long descriptor format. Likewise, the T0SZ field of the HTCR is 3-bits. KVM currently defines TTBCR_T{0,1}SZ as 3, not 7. The T0SZ mask is used to calculate the value for the HTCR, both to pick out TTBCR.T0SZ and mask off the equivalent field in the HTCR during read-modify-write. The incorrect mask size causes the (UNKNOWN) reset value of HTCR.T0SZ to leak in to the calculated HTCR value. Linux will hang when initializing KVM if HTCR's reset value has bit 2 set (sometimes the case on A7/TC2) Fixing T0SZ allows A7 cores to boot and T1SZ is also fixed for completeness. Signed-off-by: -
Jonathan Austin authored
KVM does not have a notion of multiple clusters for CPUs, just a linear array of CPUs. When using a system with cores in more than one cluster, the current method for calculating the virtual MPIDR will leak the (physical) cluster information into the virtual MPIDR. One effect of this is that Linux under KVM fails to boot multiple CPUs that aren't in the 0th cluster. This patch does away with exposing the real MPIDR fields in favour of simply using the virtual CPU number (but preserving the U bit, as before). Signed-off-by:
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- 10 Oct, 2013 1 commit
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Arthur Chunqi Li authored
This patch contains the following two changes: 1. Fix the bug in nested preemption timer support. If vmexit L2->L0 with some reasons not emulated by L1, preemption timer value should be save in such exits. 2. Add support of "Save VMX-preemption timer value" VM-Exit controls to nVMX. With this patch, nested VMX preemption timer features are fully supported. Signed-off-by:
Arthur Chunqi Li <yzt356@gmail.com> Reviewed-by:
Paolo Bonzini <pbonzini@redhat.com>
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- 03 Oct, 2013 8 commits
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Paolo Bonzini authored
kvm_mmu initialization is mostly filling in function pointers, there is no way for it to fail. Clean up unused return values. Signed-off-by:
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Paolo Bonzini authored
They do the same thing, and destroy_kvm_mmu can be confused with kvm_mmu_destroy. Signed-off-by:
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Paolo Bonzini authored
The new_cr3 MMU callback has been a wrapper for mmu_free_roots since commit e676505a (KVM: MMU: Force cr3 reload with two dimensional paging on mov cr3 emulation, 2012-07-08). The commit message mentioned that "mmu_free_roots() is somewhat of an overkill, but fixing that is more complicated and will be done after this minimal fix". One year has passed, and no one really felt the need to do a different fix. Wrap the call with a kvm_mmu_new_cr3 function for clarity, but remove the callback. Signed-off-by:
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Paolo Bonzini authored
The free MMU callback has been a wrapper for mmu_free_roots since mmu_free_roots itself was introduced (commit 17ac10ad, [PATCH] KVM: MU: Special treatment for shadow pae root pages, 2007-01-05), and has always been the same for all MMU cases. Remove the indirection as it is useless. Signed-off-by:
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Paolo Bonzini authored
This makes the interface more deterministic for userspace, which can expect (after configuring only the features it supports) to get exactly the same state from the kernel, independent of the host CPU and kernel version. Suggested-by:
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Paolo Bonzini authored
A guest can still attempt to save and restore XSAVE states even if they have been masked in CPUID leaf 0Dh. This usually is not visible to the guest, but is still wrong: "Any attempt to set a reserved bit (as determined by the contents of EAX and EDX after executing CPUID with EAX=0DH, ECX= 0H) in XCR0 for a given processor will result in a #GP exception". The patch also performs the same checks as __kvm_set_xcr in KVM_SET_XSAVE. This catches migration from newer to older kernel/processor before the guest starts running. Signed-off-by:
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Paolo Bonzini authored
XSAVE entries that KVM does not support are reported by KVM_GET_SUPPORTED_CPUID for leaf 0Dh index 0 if the host supports them; they should be left out unless there is also hypervisor support for them. Sub-leafs are correctly handled in supported_xcr0_bit, fix index 0 to match. Signed-off-by:
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Andre Richter authored
When KVM (de)assigns PCI(e) devices to VMs, a debug message is printed including the BDF notation of the respective device. Currently, the BDF notation does not have the commonly used leading zeros. This produces messages like "assign device 0:1:8.0", which look strange at first sight. The patch fixes this by exchanging the printk(KERN_DEBUG ...) with dev_info() and also inserts "kvm" into the debug message, so that it is obvious where the message comes from. Also reduces LoC. Acked-by:
Alex Williamson <alex.williamson@redhat.com> Signed-off-by:
Andre Richter <andre.o.richter@gmail.com> Signed-off-by:
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- 02 Oct, 2013 3 commits
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Anup Patel authored
To implement CPU=Host we have added KVM_ARM_PREFERRED_TARGET vm ioctl which provides information to user space required for creating VCPU matching underlying Host. This patch adds info related to this new KVM_ARM_PREFERRED_TARGET vm ioctl in the KVM API documentation. Signed-off-by:
Anup Patel <anup.patel@linaro.org> Signed-off-by:
Pranavkumar Sawargaonkar <pranavkumar@linaro.org> Signed-off-by:
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Anup Patel authored
For implementing CPU=host, we need a mechanism for querying preferred VCPU target type on underlying Host. This patch implements KVM_ARM_PREFERRED_TARGET vm ioctl which returns struct kvm_vcpu_init instance containing information about preferred VCPU target type and target specific features available for it. Signed-off-by:
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Anup Patel authored
This patch implements kvm_vcpu_preferred_target() function for KVM ARM64 which will help us implement KVM_ARM_PREFERRED_TARGET ioctl for user space. Signed-off-by:
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