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  1. 28 7月, 2014 4 次提交
    • M
      KVM: PPC: Allow kvmppc_get_last_inst() to fail · 51f04726
      由 Mihai Caraman 提交于 
      On book3e, guest last instruction is read on the exit path using load
external pid (lwepx) dedicated instruction. This load operation may fail
due to TLB eviction and execute-but-not-read entries.

This patch lay down the path for an alternative solution to read the guest
last instruction, by allowing kvmppc_get_lat_inst() function to fail.
Architecture specific implmentations of kvmppc_load_last_inst() may read
last guest instruction and instruct the emulation layer to re-execute the
guest in case of failure.

Make kvmppc_get_last_inst() definition common between architectures.
Signed-off-by: NMihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      51f04726
    • A
      KVM: PPC: Book3S: Make magic page properly 4k mappable · 89b68c96
      由 Alexander Graf 提交于 
      The magic page is defined as a 4k page of per-vCPU data that is shared
between the guest and the host to accelerate accesses to privileged
registers.

However, when the host is using 64k page size granularity we weren't quite
as strict about that rule anymore. Instead, we partially treated all of the
upper 64k as magic page and mapped only the uppermost 4k with the actual
magic contents.

This works well enough for Linux which doesn't use any memory in kernel
space in the upper 64k, but Mac OS X got upset. So this patch makes magic
page actually stay in a 4k range even on 64k page size hosts.

This patch fixes magic page usage with Mac OS X (using MOL) on 64k PAGE_SIZE
hosts for me.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      89b68c96
    • P
      KVM: PPC: Book3S: Allow only implemented hcalls to be enabled or disabled · ae2113a4
      由 Paul Mackerras 提交于 
      This adds code to check that when the KVM_CAP_PPC_ENABLE_HCALL
capability is used to enable or disable in-kernel handling of an
hcall, that the hcall is actually implemented by the kernel.
If not an EINVAL error is returned.

This also checks the default-enabled list of hcalls and prints a
warning if any hcall there is not actually implemented.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      ae2113a4
    • P
      KVM: PPC: Book3S: Controls for in-kernel sPAPR hypercall handling · 699a0ea0
      由 Paul Mackerras 提交于 
      This provides a way for userspace controls which sPAPR hcalls get
handled in the kernel.  Each hcall can be individually enabled or
disabled for in-kernel handling, except for H_RTAS.  The exception
for H_RTAS is because userspace can already control whether
individual RTAS functions are handled in-kernel or not via the
KVM_PPC_RTAS_DEFINE_TOKEN ioctl, and because the numeric value for
H_RTAS is out of the normal sequence of hcall numbers.

Hcalls are enabled or disabled using the KVM_ENABLE_CAP ioctl for the
KVM_CAP_PPC_ENABLE_HCALL capability on the file descriptor for the VM.
The args field of the struct kvm_enable_cap specifies the hcall number
in args[0] and the enable/disable flag in args[1]; 0 means disable
in-kernel handling (so that the hcall will always cause an exit to
userspace) and 1 means enable.  Enabling or disabling in-kernel
handling of an hcall is effective across the whole VM.

The ability for KVM_ENABLE_CAP to be used on a VM file descriptor
on PowerPC is new, added by this commit.  The KVM_CAP_ENABLE_CAP_VM
capability advertises that this ability exists.

When a VM is created, an initial set of hcalls are enabled for
in-kernel handling.  The set that is enabled is the set that have
an in-kernel implementation at this point.  Any new hcall
implementations from this point onwards should not be added to the
default set without a good reason.

No distinction is made between real-mode and virtual-mode hcall
implementations; the one setting controls them both.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      699a0ea0
  3. 30 5月, 2014 4 次提交
    • A
      KVM: PPC: Add CAP to indicate hcall fixes · f2e91042
      由 Alexander Graf 提交于 
      We worked around some nasty KVM magic page hcall breakages:

  1) NX bit not honored, so ignore NX when we detect it
  2) LE guests swizzle hypercall instruction

Without these fixes in place, there's no way it would make sense to expose kvm
hypercalls to a guest. Chances are immensely high it would trip over and break.

So add a new CAP that gives user space a hint that we have workarounds for the
bugs above in place. It can use those as hint to disable PV hypercalls when
the guest CPU is anything POWER7 or higher and the host does not have fixes
in place.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      f2e91042
    • A
      KVM: PPC: Disable NX for old magic page using guests · f3383cf8
      由 Alexander Graf 提交于 
      Old guests try to use the magic page, but map their trampoline code inside
of an NX region.

Since we can't fix those old kernels, try to detect whether the guest is sane
or not. If not, just disable NX functionality in KVM so that old guests at
least work at all. For newer guests, add a bit that we can set to keep NX
functionality available.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      f3383cf8
    • A
      KVM: PPC: Make shared struct aka magic page guest endian · 5deb8e7a
      由 Alexander Graf 提交于 
      The shared (magic) page is a data structure that contains often used
supervisor privileged SPRs accessible via memory to the user to reduce
the number of exits we have to take to read/write them.

When we actually share this structure with the guest we have to maintain
it in guest endianness, because some of the patch tricks only work with
native endian load/store operations.

Since we only share the structure with either host or guest in little
endian on book3s_64 pr mode, we don't have to worry about booke or book3s hv.

For booke, the shared struct stays big endian. For book3s_64 hv we maintain
the struct in host native endian, since it never gets shared with the guest.

For book3s_64 pr we introduce a variable that tells us which endianness the
shared struct is in and route every access to it through helper inline
functions that evaluate this variable.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      5deb8e7a
    • A
      KVM: PPC: PR: Fill pvinfo hcall instructions in big endian · 2743103f
      由 Alexander Graf 提交于 
      We expose a blob of hypercall instructions to user space that it gives to
the guest via device tree again. That blob should contain a stream of
instructions necessary to do a hypercall in big endian, as it just gets
passed into the guest and old guests use them straight away.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      2743103f
  5. 28 5月, 2014 1 次提交
  7. 27 1月, 2014 2 次提交
    • S
      kvm/ppc: IRQ disabling cleanup · 6c85f52b
      由 Scott Wood 提交于 
      Simplify the handling of lazy EE by going directly from fully-enabled
to hard-disabled.  This replaces the lazy_irq_pending() check
(including its misplaced kvm_guest_exit() call).

As suggested by Tiejun Chen, move the interrupt disabling into
kvmppc_prepare_to_enter() rather than have each caller do it.  Also
move the IRQ enabling on heavyweight exit into
kvmppc_prepare_to_enter().
Signed-off-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      6c85f52b
    • C
      KVM: PPC: Book3S: MMIO emulation support for little endian guests · 73601775
      由 Cédric Le Goater 提交于 
      MMIO emulation reads the last instruction executed by the guest
and then emulates. If the guest is running in Little Endian order,
or more generally in a different endian order of the host, the
instruction needs to be byte-swapped before being emulated.

This patch adds a helper routine which tests the endian order of
the host and the guest in order to decide whether a byteswap is
needed or not. It is then used to byteswap the last instruction
of the guest in the endian order of the host before MMIO emulation
is performed.

Finally, kvmppc_handle_load() of kvmppc_handle_store() are modified
to reverse the endianness of the MMIO if required.
Signed-off-by: NCédric Le Goater <clg@fr.ibm.com>
[agraf: add booke handling]
Signed-off-by: NAlexander Graf <agraf@suse.de>
      73601775
  9. 09 1月, 2014 1 次提交
  11. 18 10月, 2013 2 次提交
  13. 17 10月, 2013 4 次提交
  15. 04 9月, 2013 1 次提交
  17. 18 7月, 2013 1 次提交
  19. 11 7月, 2013 1 次提交
  21. 02 5月, 2013 2 次提交
  23. 27 4月, 2013 6 次提交
  25. 17 4月, 2013 1 次提交
  27. 22 3月, 2013 1 次提交
  29. 05 3月, 2013 3 次提交
  31. 10 1月, 2013 2 次提交
    • A
      KVM: PPC: BookE: Implement EPR exit · 1c810636
      由 Alexander Graf 提交于 
      The External Proxy Facility in FSL BookE chips allows the interrupt
controller to automatically acknowledge an interrupt as soon as a
core gets its pending external interrupt delivered.

Today, user space implements the interrupt controller, so we need to
check on it during such a cycle.

This patch implements logic for user space to enable EPR exiting,
disable EPR exiting and EPR exiting itself, so that user space can
acknowledge an interrupt when an external interrupt has successfully
been delivered into the guest vcpu.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      1c810636
    • A
      KVM: PPC: Only WARN on invalid emulation · 5a33169e
      由 Alexander Graf 提交于 
      When we hit an emulation result that we didn't expect, that is an error,
but it's nothing that warrants a BUG(), because it can be guest triggered.

So instead, let's only WARN() the user that this happened.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      5a33169e
  33. 14 12月, 2012 1 次提交
  35. 06 12月, 2012 2 次提交
    • P
      KVM: PPC: Book3S HV: Provide a method for userspace to read and write the HPT · a2932923
      由 Paul Mackerras 提交于 
      A new ioctl, KVM_PPC_GET_HTAB_FD, returns a file descriptor.  Reads on
this fd return the contents of the HPT (hashed page table), writes
create and/or remove entries in the HPT.  There is a new capability,
KVM_CAP_PPC_HTAB_FD, to indicate the presence of the ioctl.  The ioctl
takes an argument structure with the index of the first HPT entry to
read out and a set of flags.  The flags indicate whether the user is
intending to read or write the HPT, and whether to return all entries
or only the "bolted" entries (those with the bolted bit, 0x10, set in
the first doubleword).

This is intended for use in implementing qemu's savevm/loadvm and for
live migration.  Therefore, on reads, the first pass returns information
about all HPTEs (or all bolted HPTEs).  When the first pass reaches the
end of the HPT, it returns from the read.  Subsequent reads only return
information about HPTEs that have changed since they were last read.
A read that finds no changed HPTEs in the HPT following where the last
read finished will return 0 bytes.

The format of the data provides a simple run-length compression of the
invalid entries.  Each block of data starts with a header that indicates
the index (position in the HPT, which is just an array), the number of
valid entries starting at that index (may be zero), and the number of
invalid entries following those valid entries.  The valid entries, 16
bytes each, follow the header.  The invalid entries are not explicitly
represented.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
[agraf: fix documentation]
Signed-off-by: NAlexander Graf <agraf@suse.de>
      a2932923
    • A
      KVM: PPC: Support eventfd · 0e673fb6
      由 Alexander Graf 提交于 
      In order to support the generic eventfd infrastructure on PPC, we need
to call into the generic KVM in-kernel device mmio code.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      0e673fb6
  37. 28 11月, 2012 1 次提交