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  1. 17 10月, 2012 2 次提交
  3. 11 10月, 2012 5 次提交
  5. 09 10月, 2012 2 次提交
  7. 06 10月, 2012 31 次提交
    • J
      arch/powerpc/kvm/e500_tlb.c: fix error return code · 12ecd957
      由 Julia Lawall 提交于 
      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: NJulia Lawall <julia@diku.dk>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      12ecd957
    • P
      KVM: PPC: Book3S HV: Provide a way for userspace to get/set per-vCPU areas · 55b665b0
      由 Paul Mackerras 提交于 
      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: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      55b665b0
    • P
      KVM: PPC: Book3S: Get/set guest FP regs using the GET/SET_ONE_REG interface · a8bd19ef
      由 Paul Mackerras 提交于 
      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: NPaul Mackerras <paulus@samba.org>
[agraf: fix whitespace, vsx compilation]
Signed-off-by: NAlexander Graf <agraf@suse.de>
      a8bd19ef
    • P
      KVM: PPC: Book3S: Get/set guest SPRs using the GET/SET_ONE_REG interface · a136a8bd
      由 Paul Mackerras 提交于 
      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: NPaul Mackerras <paulus@samba.org>
[agraf: minimal style fixes]
Signed-off-by: NAlexander Graf <agraf@suse.de>
      a136a8bd
    • S
      KVM: PPC: set IN_GUEST_MODE before checking requests · 5bd1cf11
      由 Scott Wood 提交于 
      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: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      5bd1cf11
    • S
      KVM: PPC: e500: MMU API: fix leak of shared_tlb_pages · adbb48a8
      由 Scott Wood 提交于 
      This was found by kmemleak.
Signed-off-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      adbb48a8
    • S
      KVM: PPC: e500: fix allocation size error on g2h_tlb1_map · e400e72f
      由 Scott Wood 提交于 
      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: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
Cc: stable@vger.kernel.org
      e400e72f
    • P
      KVM: PPC: Book3S HV: Fix calculation of guest phys address for MMIO emulation · 70bddfef
      由 Paul Mackerras 提交于 
      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: NAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      70bddfef
    • P
      KVM: PPC: Book3S HV: Remove bogus update of physical thread IDs · 964ee98c
      由 Paul Mackerras 提交于 
      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: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      964ee98c
    • P
      KVM: PPC: Book3S HV: Fix updates of vcpu->cpu · a47d72f3
      由 Paul Mackerras 提交于 
      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: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      a47d72f3
    • P
      KVM: Move some PPC ioctl definitions to the correct place · ed7a8d7a
      由 Paul Mackerras 提交于 
      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: NPaul Mackerras <paulus@samba.org>
Acked-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      ed7a8d7a
    • P
      KVM: PPC: Book3S HV: Handle memory slot deletion and modification correctly · dfe49dbd
      由 Paul Mackerras 提交于 
      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: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      dfe49dbd
    • P
      KVM: PPC: Move kvm->arch.slot_phys into memslot.arch · a66b48c3
      由 Paul Mackerras 提交于 
      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: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      a66b48c3
    • P
      KVM: PPC: Book3S HV: Take the SRCU read lock before looking up memslots · 2c9097e4
      由 Paul Mackerras 提交于 
      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: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      2c9097e4
    • M
      KVM: PPC: bookehv: Allow duplicate calls of DO_KVM macro · d61966fc
      由 Mihai Caraman 提交于 
      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: NMihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      d61966fc
    • A
      KVM: PPC: BookE: Support FPU on non-hv systems · 7a08c274
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      7a08c274
    • A
      KVM: PPC: 440: Implement mfdcrx · ceb985f9
      由 Alexander Graf 提交于 
      We need mfdcrx to execute properly on 460 cores.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      ceb985f9
    • A
      KVM: PPC: 440: Implement mtdcrx · e4dcfe88
      由 Alexander Graf 提交于 
      We need mtdcrx to execute properly on 460 cores.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      e4dcfe88
    • B
      Document IACx/DACx registers access using ONE_REG API · 2e232702
      由 Bharat Bhushan 提交于 
      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: NBharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      2e232702
    • A
      KVM: PPC: E500: Remove E500_TLB_DIRTY flag · 430c7ff5
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      430c7ff5
    • A
      KVM: PPC: Use symbols for exit trace · 166a2b70
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      166a2b70
    • A
      KVM: PPC: BookE: Add MCSR SPR support · 50c871ed
      由 Alexander Graf 提交于 
      Add support for the MCSR SPR. This only implements the SPR storage
bits, not actual machine checks.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      50c871ed
    • A
      KVM: PPC: 44x: Initialize PVR · 491dd5b8
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      491dd5b8
    • B
      booke: Added ONE_REG interface for IAC/DAC debug registers · 6df8d3fc
      由 Bharat Bhushan 提交于 
      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: NBharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      6df8d3fc
    • B
      KVM: PPC: booke: Add watchdog emulation · f61c94bb
      由 Bharat Bhushan 提交于 
      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: NLiu Yu <yu.liu@freescale.com>
Signed-off-by: NScott Wood <scottwood@freescale.com>
[bharat.bhushan@freescale.com: reworked patch]
Signed-off-by: NBharat Bhushan <bharat.bhushan@freescale.com>
[agraf: adjust to new request framework]
Signed-off-by: NAlexander Graf <agraf@suse.de>
      f61c94bb
    • A
      KVM: PPC: Add return value to core_check_requests · 7c973a2e
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      7c973a2e
    • A
      KVM: PPC: Add return value in prepare_to_enter · 7ee78855
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      7ee78855
    • A
      KVM: PPC: Ignore EXITING_GUEST_MODE mode · 206c2ed7
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      206c2ed7
    • A
      KVM: PPC: Move kvm_guest_enter call into generic code · 3766a4c6
      由 Alexander Graf 提交于 
      We need to call kvm_guest_enter in booke and book3s, so move its
call to generic code.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      3766a4c6
    • A
      KVM: PPC: Book3S: PR: Rework irq disabling · bd2be683
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      bd2be683
    • A
      KVM: PPC: Consistentify vcpu exit path · 24afa37b
      由 Alexander Graf 提交于 
      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: NAlexander Graf <agraf@suse.de>
      24afa37b