linux-toradex.git/arch/powerpc/kvm, branch v3.0.75

KVM: PPC: 44x: fix DCR read/write

2013-01-17T16:44:13+00:00

commit e43a028752fed049e4bd94ef895542f96d79fa74 upstream.

When remembering the direction of a DCR transaction, we should write
to the same variable that we interpret on later when doing vcpu_run
again.

Signed-off-by: Alexander Graf 
Signed-off-by: CAI Qian 
Signed-off-by: Greg Kroah-Hartman

Merge branch 'kvm-updates/2.6.40' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2011-05-23T15:42:08+00:00

* 'kvm-updates/2.6.40' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (131 commits)
  KVM: MMU: Use ptep_user for cmpxchg_gpte()
  KVM: Fix kvm mmu_notifier initialization order
  KVM: Add documentation for KVM_CAP_NR_VCPUS
  KVM: make guest mode entry to be rcu quiescent state
  KVM: x86 emulator: Make jmp far emulation into a separate function
  KVM: x86 emulator: Rename emulate_grpX() to em_grpX()
  KVM: x86 emulator: Remove unused arg from emulate_pop()
  KVM: x86 emulator: Remove unused arg from writeback()
  KVM: x86 emulator: Remove unused arg from read_descriptor()
  KVM: x86 emulator: Remove unused arg from seg_override()
  KVM: Validate userspace_addr of memslot when registered
  KVM: MMU: Clean up gpte reading with copy_from_user()
  KVM: PPC: booke: add sregs support
  KVM: PPC: booke: save/restore VRSAVE (a.k.a. USPRG0)
  KVM: PPC: use ticks, not usecs, for exit timing
  KVM: PPC: fix exit accounting for SPRs, tlbwe, tlbsx
  KVM: PPC: e500: emulate SVR
  KVM: VMX: Cache vmcs segment fields
  KVM: x86 emulator: consolidate segment accessors
  KVM: VMX: Avoid reading %rip unnecessarily when handling exceptions
  ...

KVM: PPC: booke: add sregs support

2011-05-22T12:47:53+00:00

Signed-off-by: Scott Wood 
Signed-off-by: Alexander Graf

KVM: PPC: booke: save/restore VRSAVE (a.k.a. USPRG0)

2011-05-22T12:47:50+00:00

Linux doesn't use USPRG0 (now renamed VRSAVE in the architecture, even
when Altivec isn't involved), but a guest might.

Signed-off-by: Scott Wood 
Signed-off-by: Alexander Graf

KVM: PPC: use ticks, not usecs, for exit timing

2011-05-22T12:47:49+00:00

Convert to microseconds when displaying
(with fix from Bharat Bhushan ).

This reduces rounding error with large quantities of short exits.

Signed-off-by: Stuart Yoder 
Signed-off-by: Scott Wood 
Signed-off-by: Alexander Graf

KVM: PPC: fix exit accounting for SPRs, tlbwe, tlbsx

2011-05-22T12:47:47+00:00

The exit type setting for mfspr/mtspr is moved from 44x to toplevel SPR
emulation.  This enables it on e500, and makes sure that all SPRs
are covered.

Exit accounting for tlbwe and tlbsx is added to e500.

Signed-off-by: Stuart Yoder 
Signed-off-by: Scott Wood 
Signed-off-by: Alexander Graf

KVM: PPC: e500: emulate SVR

2011-05-22T12:47:46+00:00

Return the actual host SVR for now, as we already do for PVR.  Eventually
we may support Qemu overriding PVR/SVR if the situation is appropriate,
once we implement KVM_SET_SREGS on e500.

Signed-off-by: Scott Wood 
Signed-off-by: Alexander Graf

powerpc/kvm: Fix the build for 32-bit Book 3S (classic) processors

2011-05-20T03:43:41+00:00

Commits a5d4f3ad3a ("powerpc: Base support for exceptions using
HSRR0/1") and 673b189a2e ("powerpc: Always use SPRN_SPRG_HSCRATCH0
when running in HV mode") cause compile and link errors for 32-bit
classic Book 3S processors when KVM is enabled.  This fixes these
errors.

Signed-off-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

powerpc/kvm: Fix kvmppc_core_pending_dec

2011-05-20T03:43:41+00:00

The vcpu->arch.pending_exceptions field is a bitfield indexed by
interrupt priority number as returned by kvmppc_book3s_vec2irqprio.
However, kvmppc_core_pending_dec was using an interrupt vector shifted
by 7 as the bit index.  Fix it to use the irqprio value for the
decrementer interrupt instead.  This problem was found by code
inspection.

Signed-off-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

KVM: PPC: Fix issue clearing exit timing counters

2011-05-11T11:57:04+00:00

Following dump is observed on host when clearing the exit timing counters

[root@p1021mds kvm]# echo -n 'c' > vm1200_vcpu0_timing
INFO: task echo:1276 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
echo          D 0ff5bf94     0  1276   1190 0x00000000
Call Trace:
[c2157e40] [c0007908] __switch_to+0x9c/0xc4
[c2157e50] [c040293c] schedule+0x1b4/0x3bc
[c2157e90] [c04032dc] __mutex_lock_slowpath+0x74/0xc0
[c2157ec0] [c00369e4] kvmppc_init_timing_stats+0x20/0xb8
[c2157ed0] [c0036b00] kvmppc_exit_timing_write+0x84/0x98
[c2157ef0] [c00b9f90] vfs_write+0xc0/0x16c
[c2157f10] [c00ba284] sys_write+0x4c/0x90
[c2157f40] [c000e320] ret_from_syscall+0x0/0x3c

        The vcpu->mutex is used by kvm_ioctl_* (KVM_RUN etc) and same was
used when clearing the stats (in kvmppc_init_timing_stats()). What happens
is that when the guest is idle then it held the vcpu->mutx. While the
exiting timing process waits for guest to release the vcpu->mutex and
a hang state is reached.

        Now using seprate lock for exit timing stats.

Signed-off-by: Bharat Bhushan 
Acked-by: Alexander Graf 
Signed-off-by: Avi Kivity