linux-toradex.git/arch/powerpc/kvm/emulate.c, branch v3.4.22

KVM: PPC: booke: Improve timer register emulation

2012-03-05T12:52:27+00:00

Decrementers are now properly driven by TCR/TSR, and the guest
has full read/write access to these registers.

The decrementer keeps ticking (and setting the TSR bit) regardless of
whether the interrupts are enabled with TCR.

The decrementer stops at zero, rather than going negative.

Decrementers (and FITs, once implemented) are delivered as
level-triggered interrupts -- dequeued when the TSR bit is cleared, not
on delivery.

Signed-off-by: Liu Yu 
[scottwood@freescale.com: significant changes]
Signed-off-by: Scott Wood 
Signed-off-by: Alexander Graf 
Signed-off-by: Avi Kivity

KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn

2012-03-05T12:52:26+00:00

This allows additional registers to be accessed by the guest
in PR-mode KVM without trapping.

SPRG4-7 are readable from userspace.  On booke, KVM will sync
these registers when it enters the guest, so that accesses from
guest userspace will work.  The guest kernel, OTOH, must consistently
use either the real registers or the shared area between exits.  This
also applies to the already-paravirted SPRG3.

On non-booke, it's not clear to what extent SPRG4-7 are supported
(they're not architected for book3s, but exist on at least some classic
chips).  They are copied in the get/set regs ioctls, but I do not see any
non-booke emulation.  I also do not see any syncing with real registers
(in PR-mode) including the user-readable SPRG3.  This patch should not
make that situation any worse.

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

KVM: PPC: booke: Do Not start decrementer when SPRN_DEC set 0

2012-03-05T12:52:25+00:00

As per specification the decrementer interrupt not happen when DEC is written
with 0. Also when DEC is zero, no decrementer running. So we should not start
hrtimer for decrementer when DEC = 0.

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

KVM: PPC: Fix DEC truncation for greater than 0xffff_ffff/1000

2012-03-05T12:52:25+00:00

kvmppc_emulate_dec() uses dec_nsec of type unsigned long and does below calculation:

        dec_nsec = vcpu->arch.dec;
        dec_nsec *= 1000;
This will truncate if DEC value "vcpu->arch.dec" is greater than 0xffff_ffff/1000.
For example : For tb_ticks_per_usec = 4a, we can not set decrementer more than ~58ms.

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

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: 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

Merge branch 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2010-10-24T19:47:25+00:00

* 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (321 commits)
  KVM: Drop CONFIG_DMAR dependency around kvm_iommu_map_pages
  KVM: Fix signature of kvm_iommu_map_pages stub
  KVM: MCE: Send SRAR SIGBUS directly
  KVM: MCE: Add MCG_SER_P into KVM_MCE_CAP_SUPPORTED
  KVM: fix typo in copyright notice
  KVM: Disable interrupts around get_kernel_ns()
  KVM: MMU: Avoid sign extension in mmu_alloc_direct_roots() pae root address
  KVM: MMU: move access code parsing to FNAME(walk_addr) function
  KVM: MMU: audit: check whether have unsync sps after root sync
  KVM: MMU: audit: introduce audit_printk to cleanup audit code
  KVM: MMU: audit: unregister audit tracepoints before module unloaded
  KVM: MMU: audit: fix vcpu's spte walking
  KVM: MMU: set access bit for direct mapping
  KVM: MMU: cleanup for error mask set while walk guest page table
  KVM: MMU: update 'root_hpa' out of loop in PAE shadow path
  KVM: x86 emulator: Eliminate compilation warning in x86_decode_insn()
  KVM: x86: Fix constant type in kvm_get_time_scale
  KVM: VMX: Add AX to list of registers clobbered by guest switch
  KVM guest: Move a printk that's using the clock before it's ready
  KVM: x86: TSC catchup mode
  ...

KVM: PPC: Convert SPRG[0-4] to shared page

2010-10-24T08:50:45+00:00

When in kernel mode there are 4 additional registers available that are
simple data storage. Instead of exiting to the hypervisor to read and
write those, we can just share them with the guest using the page.

This patch converts all users of the current field to the shared page.

Signed-off-by: Alexander Graf 
Signed-off-by: Avi Kivity

KVM: PPC: Convert SRR0 and SRR1 to shared page

2010-10-24T08:50:45+00:00

The SRR0 and SRR1 registers contain cached values of the PC and MSR
respectively. They get written to by the hypervisor when an interrupt
occurs or directly by the kernel. They are also used to tell the rfi(d)
instruction where to jump to.

Because it only gets touched on defined events that, it's very simple to
share with the guest. Hypervisor and guest both have full r/w access.

This patch converts all users of the current field to the shared page.

Signed-off-by: Alexander Graf 
Signed-off-by: Avi Kivity

powerpc: Remove pr_ uses of KERN_

2010-10-13T05:19:03+00:00

Signed-off-by: Joe Perches 
Signed-off-by: Benjamin Herrenschmidt