linux.git/arch/powerpc/kernel/kvm.c, branch v3.0.14

powerpc: Copy down exception vectors after feature fixups

2011-11-21T22:31:25+00:00

commit d715e433b7ad19c02fc4becf0d5e9a59f97925de upstream.

kdump fails because we try to execute an HV only instruction. Feature
fixups are being applied after we copy the exception vectors down to 0
so they miss out on any updates.

We have always had this issue but it only became critical in v3.0
when we added CFAR support (breaks POWER5) and v3.1 when we added
POWERNV (breaks everyone).

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Greg Kroah-Hartman

PPC: KVM: Book E doesn't have __end_interrupts.

2010-11-05T16:42:27+00:00

Fix an unresolved symbol with CONFIG_KVM_GUEST plus CONFIG_RELOCATABLE on
Book E.

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

KVM: PPC: Enable napping only for Book3s_64

2010-10-24T08:52:19+00:00

Before I incorrectly enabled napping also for BookE, which would result in
needless dcache flushes. Since we only need to force enable napping on
Book3s_64 because it doesn't go into MSR_POW otherwise, we can just #ifdef
that code to this particular platform.

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

KVM: PPC: Force enable nap on KVM

2010-10-24T08:52:15+00:00

There are some heuristics in the PPC power management code that try to find
out if the particular hardware we're running on supports proper power management
or just hangs the machine when going into nap mode.

Since we know that KVM is safe with nap, let's force enable it in the PV code
once we're certain that we are on a KVM VM.

Signed-off-by: Alexander Graf

KVM: PPC: Make PV mtmsrd L=1 work with r30 and r31

2010-10-24T08:52:14+00:00

We had an arbitrary limitation in mtmsrd L=1 that kept us from using r30 and
r31 as input registers. Let's get rid of that and get more potential speedups!

Signed-off-by: Alexander Graf

KVM: PPC: Make PV mtmsr work with r30 and r31

2010-10-24T08:52:13+00:00

So far we've been restricting ourselves to r0-r29 as registers an mtmsr
instruction could use. This was bad, as there are some code paths in
Linux actually using r30.

So let's instead handle all registers gracefully and get rid of that
stupid limitation

Signed-off-by: Alexander Graf

KVM: PPC: Add mtsrin PV code

2010-10-24T08:52:12+00:00

This is the guest side of the mtsr acceleration. Using this a guest can now
call mtsrin with almost no overhead as long as it ensures that it only uses
it with (MSR_IR|MSR_DR) == 0. Linux does that, so we're good.

Signed-off-by: Alexander Graf

KVM: PPC: Add feature bitmap for magic page

2010-10-24T08:52:09+00:00

We will soon add SR PV support to the shared page, so we need some
infrastructure that allows the guest to query for features KVM exports.

This patch adds a second return value to the magic mapping that
indicated to the guest which features are available.

Signed-off-by: Alexander Graf

KVM: PPC: Fix CONFIG_KVM_GUEST && !CONFIG_KVM case

2010-10-24T08:51:44+00:00

When CONFIG_KVM_GUEST is selected, but CONFIG_KVM is not, we were missing
some defines in asm-offsets.c and included too many headers at other places.

This patch makes above configuration work.

Reported-by: Stephen Rothwell 
Signed-off-by: Alexander Graf 
Signed-off-by: Avi Kivity

KVM: PPC: PV wrteei

2010-10-24T08:50:57+00:00

On BookE the preferred way to write the EE bit is the wrteei instruction. It
already encodes the EE bit in the instruction.

So in order to get BookE some speedups as well, let's also PV'nize thati
instruction.

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