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KVM: PPC: Add hidden flag for paired singles

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The Gekko implements an extension called paired singles. When the guest wants
to use that extension, we need to make sure we're not running the host FPU,
because all FPU instructions need to get emulated to accomodate for additional
operations that occur.

This patch adds an hflag to track if we're in paired single mode or not.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2010-02-19 11:00:32 +01:00 committed by Avi Kivity
parent 37f5bca64e
commit 3c402a75ea
2 changed files with 5 additions and 0 deletions
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1
arch/powerpc/include/asm/kvm_asm.h
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@ -88,6 +88,7 @@
#define BOOK3S_HFLAG_DCBZ32 0x1
#define BOOK3S_HFLAG_SLB 0x2
#define BOOK3S_HFLAG_PAIRED_SINGLE 0x4
#define RESUME_FLAG_NV (1<<0) /* Reload guest nonvolatile state? */
#define RESUME_FLAG_HOST (1<<1) /* Resume host? */

4
arch/powerpc/kvm/book3s.c
View file

@ -639,6 +639,10 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
u64 *thread_fpr = (u64*)t->fpr;
int i;
/* When we have paired singles, we emulate in software */
if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
return RESUME_GUEST;
if (!(vcpu->arch.msr & msr)) {
kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
return RESUME_GUEST;