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  1. 30 5月, 2012 1 次提交
  3. 06 5月, 2012 2 次提交
    • A
      KVM: PPC: Emulator: clean up SPR reads and writes · 54771e62
      由 Alexander Graf 提交于 
      When reading and writing SPRs, every SPR emulation piece had to read
or write the respective GPR the value was read from or stored in itself.

This approach is pretty prone to failure. What if we accidentally
implement mfspr emulation where we just do "break" and nothing else?
Suddenly we would get a random value in the return register - which is
always a bad idea.

So let's consolidate the generic code paths and only give the core
specific SPR handling code readily made variables to read/write from/to.

Functionally, this patch doesn't change anything, but it increases the
readability of the code and makes is less prone to bugs.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      54771e62
    • A
      KVM: PPC: Emulator: clean up instruction parsing · c46dc9a8
      由 Alexander Graf 提交于 
      Instructions on PPC are pretty similarly encoded. So instead of
every instruction emulation code decoding the instruction fields
itself, we can move that code to more generic places and rely on
the compiler to optimize the unused bits away.

This has 2 advantages. It makes the code smaller and it makes the
code less error prone, as the instruction fields are always
available, so accidental misusage is reduced.

Functionally, this patch doesn't change anything.
Signed-off-by: NAlexander Graf <agraf@suse.de>
      c46dc9a8
  5. 08 4月, 2012 6 次提交
  7. 05 3月, 2012 2 次提交
    • S
      KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn · b5904972
      由 Scott Wood 提交于 
      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: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAvi Kivity <avi@redhat.com>
      b5904972
    • S
      KVM: PPC: e500: MMU API · dc83b8bc
      由 Scott Wood 提交于 
      This implements a shared-memory API for giving host userspace access to
the guest's TLB.
Signed-off-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAvi Kivity <avi@redhat.com>
      dc83b8bc
  9. 12 7月, 2011 1 次提交
    • L
      KVM: PPC: e500: Add shadow PID support · dd9ebf1f
      由 Liu Yu 提交于 
      Dynamically assign host PIDs to guest PIDs, splitting each guest PID into
multiple host (shadow) PIDs based on kernel/user and MSR[IS/DS].  Use
both PID0 and PID1 so that the shadow PIDs for the right mode can be
selected, that correspond both to guest TID = zero and guest TID = guest
PID.

This allows us to significantly reduce the frequency of needing to
invalidate the entire TLB.  When the guest mode or PID changes, we just
update the host PID0/PID1.  And since the allocation of shadow PIDs is
global, multiple guests can share the TLB without conflict.

Note that KVM does not yet support the guest setting PID1 or PID2 to
a value other than zero.  This will need to be fixed for nested KVM
to work.  Until then, we enforce the requirement for guest PID1/PID2
to stay zero by failing the emulation if the guest tries to set them
to something else.
Signed-off-by: NLiu Yu <yu.liu@freescale.com>
Signed-off-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
      dd9ebf1f
  11. 22 5月, 2011 2 次提交
  13. 01 3月, 2010 3 次提交
  15. 10 9月, 2009 1 次提交
  17. 24 3月, 2009 4 次提交