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KVM: PPC: e500: Save/restore SPE state

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This is done lazily.  The SPE save will be done only if the guest has
used SPE since the last preemption or heavyweight exit.  Restore will be
done only on demand, when enabling MSR_SPE in the shadow MSR, in response
to an SPE fault or mtmsr emulation.

For SPEFSCR, Linux already switches it on context switch (non-lazily), so
the only remaining bit is to save it between qemu and the guest.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Scott Wood
2011-06-14 18:34:31 -05:00
committed by Avi Kivity
parent ecee273fc4
commit 4cd35f675b
7 changed files with 148 additions and 17 deletions
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7
arch/powerpc/kernel/asm-offsets.c
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@@ -497,6 +497,13 @@ int main(void)
DEFINE(TLBCAM_MAS7, offsetof(struct tlbcam, MAS7));
#endif
#if defined(CONFIG_KVM) && defined(CONFIG_SPE)
DEFINE(VCPU_EVR, offsetof(struct kvm_vcpu, arch.evr[0]));
DEFINE(VCPU_ACC, offsetof(struct kvm_vcpu, arch.acc));
DEFINE(VCPU_SPEFSCR, offsetof(struct kvm_vcpu, arch.spefscr));
DEFINE(VCPU_HOST_SPEFSCR, offsetof(struct kvm_vcpu, arch.host_spefscr));
#endif
#ifdef CONFIG_KVM_EXIT_TIMING
DEFINE(VCPU_TIMING_EXIT_TBU, offsetof(struct kvm_vcpu,
arch.timing_exit.tv32.tbu));