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  15. 05 Oct, 2012 23 commits
    • Julia Lawall's avatar
      arch/powerpc/kvm/e500_tlb.c: fix error return code · 12ecd957
      Julia Lawall authored 
      Convert a 0 error return code to a negative one, as returned elsewhere in the
function.

A new label is also added to avoid freeing things that are known to not yet
be allocated.

A simplified version of the semantic match that finds the first problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret;
expression e,e1,e2,e3,e4,x;
@@

(
if (\(ret != 0\|ret < 0\) || ...) { ... return ...; }
|
ret = 0
)
... when != ret = e1
*x = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\|ioremap\|ioremap_nocache\|devm_ioremap\|devm_ioremap_nocache\)(...);
... when != x = e2
    when != ret = e3
*if (x == NULL || ...)
{
  ... when != ret = e4
*  return ret;
}
// </smpl>
Signed-off-by: default avatarJulia Lawall <julia@diku.dk>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      12ecd957
    • Paul Mackerras's avatar
      KVM: PPC: Book3S HV: Provide a way for userspace to get/set per-vCPU areas · 55b665b0
      Paul Mackerras authored 
      The PAPR paravirtualization interface lets guests register three
different types of per-vCPU buffer areas in its memory for communication
with the hypervisor.  These are called virtual processor areas (VPAs).
Currently the hypercalls to register and unregister VPAs are handled
by KVM in the kernel, and userspace has no way to know about or save
and restore these registrations across a migration.

This adds "register" codes for these three areas that userspace can
use with the KVM_GET/SET_ONE_REG ioctls to see what addresses have
been registered, and to register or unregister them.  This will be
needed for guest hibernation and migration, and is also needed so
that userspace can unregister them on reset (otherwise we corrupt
guest memory after reboot by writing to the VPAs registered by the
previous kernel).

The "register" for the VPA is a 64-bit value containing the address,
since the length of the VPA is fixed.  The "registers" for the SLB
shadow buffer and dispatch trace log (DTL) are 128 bits long,
consisting of the guest physical address in the high (first) 64 bits
and the length in the low 64 bits.

This also fixes a bug where we were calling init_vpa unconditionally,
leading to an oops when unregistering the VPA.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      55b665b0
    • Paul Mackerras's avatar
      KVM: PPC: Book3S: Get/set guest FP regs using the GET/SET_ONE_REG interface · a8bd19ef
      Paul Mackerras authored 
      This enables userspace to get and set all the guest floating-point
state using the KVM_[GS]ET_ONE_REG ioctls.  The floating-point state
includes all of the traditional floating-point registers and the
FPSCR (floating point status/control register), all the VMX/Altivec
vector registers and the VSCR (vector status/control register), and
on POWER7, the vector-scalar registers (note that each FP register
is the high-order half of the corresponding VSR).

Most of these are implemented in common Book 3S code, except for VSX
on POWER7.  Because HV and PR differ in how they store the FP and VSX
registers on POWER7, the code for these cases is not common.  On POWER7,
the FP registers are the upper halves of the VSX registers vsr0 - vsr31.
PR KVM stores vsr0 - vsr31 in two halves, with the upper halves in the
arch.fpr[] array and the lower halves in the arch.vsr[] array, whereas
HV KVM on POWER7 stores the whole VSX register in arch.vsr[].
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
[agraf: fix whitespace, vsx compilation]
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      a8bd19ef
    • Paul Mackerras's avatar
      KVM: PPC: Book3S: Get/set guest SPRs using the GET/SET_ONE_REG interface · a136a8bd
      Paul Mackerras authored 
      This enables userspace to get and set various SPRs (special-purpose
registers) using the KVM_[GS]ET_ONE_REG ioctls.  With this, userspace
can get and set all the SPRs that are part of the guest state, either
through the KVM_[GS]ET_REGS ioctls, the KVM_[GS]ET_SREGS ioctls, or
the KVM_[GS]ET_ONE_REG ioctls.

The SPRs that are added here are:

- DABR:  Data address breakpoint register
- DSCR:  Data stream control register
- PURR:  Processor utilization of resources register
- SPURR: Scaled PURR
- DAR:   Data address register
- DSISR: Data storage interrupt status register
- AMR:   Authority mask register
- UAMOR: User authority mask override register
- MMCR0, MMCR1, MMCRA: Performance monitor unit control registers
- PMC1..PMC8: Performance monitor unit counter registers

In order to reduce code duplication between PR and HV KVM code, this
moves the kvm_vcpu_ioctl_[gs]et_one_reg functions into book3s.c and
centralizes the copying between user and kernel space there.  The
registers that are handled differently between PR and HV, and those
that exist only in one flavor, are handled in kvmppc_[gs]et_one_reg()
functions that are specific to each flavor.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
[agraf: minimal style fixes]
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      a136a8bd
    • Scott Wood's avatar
      KVM: PPC: set IN_GUEST_MODE before checking requests · 5bd1cf11
      Scott Wood authored 
      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: default avatarScott Wood <scottwood@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      5bd1cf11
    • Scott Wood's avatar
      KVM: PPC: e500: MMU API: fix leak of shared_tlb_pages · adbb48a8
      Scott Wood authored 
      This was found by kmemleak.
Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      adbb48a8
    • Scott Wood's avatar
      KVM: PPC: e500: fix allocation size error on g2h_tlb1_map · e400e72f
      Scott Wood authored 
      We were only allocating half the bytes we need, which was made more
obvious by a recent fix to the memset in  clear_tlb1_bitmap().
Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Cc: stable@vger.kernel.org
      e400e72f
    • Paul Mackerras's avatar
      KVM: PPC: Book3S HV: Fix calculation of guest phys address for MMIO emulation · 70bddfef
      Paul Mackerras authored 
      In the case where the host kernel is using a 64kB base page size and
the guest uses a 4k HPTE (hashed page table entry) to map an emulated
MMIO device, we were calculating the guest physical address wrongly.
We were calculating a gfn as the guest physical address shifted right
16 bits (PAGE_SHIFT) but then only adding back in 12 bits from the
effective address, since the HPTE had a 4k page size.  Thus the gpa
reported to userspace was missing 4 bits.

Instead, we now compute the guest physical address from the HPTE
without reference to the host page size, and then compute the gfn
by shifting the gpa right PAGE_SHIFT bits.
Reported-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      70bddfef
    • Paul Mackerras's avatar
      KVM: PPC: Book3S HV: Remove bogus update of physical thread IDs · 964ee98c
      Paul Mackerras authored 
      When making a vcpu non-runnable we incorrectly changed the
thread IDs of all other threads on the core, just remove that
code.
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      964ee98c
    • Paul Mackerras's avatar
      KVM: PPC: Book3S HV: Fix updates of vcpu->cpu · a47d72f3
      Paul Mackerras authored 
      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: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      a47d72f3
    • Paul Mackerras's avatar
      KVM: Move some PPC ioctl definitions to the correct place · ed7a8d7a
      Paul Mackerras authored 
      This moves the definitions of KVM_CREATE_SPAPR_TCE and
KVM_ALLOCATE_RMA in include/linux/kvm.h from the section listing the
vcpu ioctls to the section listing VM ioctls, as these are both
implemented and documented as VM ioctls.

Fortunately there is no actual collision of ioctl numbers at this
point.  Moving these to the correct section will reduce the
probability of a future collision.  This does not change the
user/kernel ABI at all.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Acked-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      ed7a8d7a
    • Paul Mackerras's avatar
      KVM: PPC: Book3S HV: Handle memory slot deletion and modification correctly · dfe49dbd
      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: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      dfe49dbd
    • Paul Mackerras's avatar
      KVM: PPC: Move kvm->arch.slot_phys into memslot.arch · a66b48c3
      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: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      a66b48c3
    • Paul Mackerras's avatar
      KVM: PPC: Book3S HV: Take the SRCU read lock before looking up memslots · 2c9097e4
      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: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      2c9097e4
    • Mihai Caraman's avatar
      KVM: PPC: bookehv: Allow duplicate calls of DO_KVM macro · d61966fc
      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: default avatarMihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      d61966fc
    • Alexander Graf's avatar
      KVM: PPC: BookE: Support FPU on non-hv systems · 7a08c274
      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: default avatarAlexander Graf <agraf@suse.de>
      7a08c274
    • Alexander Graf's avatar
      KVM: PPC: 440: Implement mfdcrx · ceb985f9
      Alexander Graf authored 
      We need mfdcrx to execute properly on 460 cores.
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      ceb985f9
    • Alexander Graf's avatar
      KVM: PPC: 440: Implement mtdcrx · e4dcfe88
      Alexander Graf authored 
      We need mtdcrx to execute properly on 460 cores.
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      e4dcfe88
    • Bharat Bhushan's avatar
      Document IACx/DACx registers access using ONE_REG API · 2e232702
      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: default avatarBharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      2e232702
    • Alexander Graf's avatar
      KVM: PPC: E500: Remove E500_TLB_DIRTY flag · 430c7ff5
      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: default avatarAlexander Graf <agraf@suse.de>
      430c7ff5
    • Alexander Graf's avatar
      KVM: PPC: Use symbols for exit trace · 166a2b70
      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: default avatarAlexander Graf <agraf@suse.de>
      166a2b70
    • Alexander Graf's avatar
      KVM: PPC: BookE: Add MCSR SPR support · 50c871ed
      Alexander Graf authored 
      Add support for the MCSR SPR. This only implements the SPR storage
bits, not actual machine checks.
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      50c871ed
    • Alexander Graf's avatar
      KVM: PPC: 44x: Initialize PVR · 491dd5b8
      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: default avatarAlexander Graf <agraf@suse.de>
      491dd5b8
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