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KVM: PPC: Use PACA backed shadow vcpu

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We're being horribly racy right now. All the entry and exit code hijacks
random fields from the PACA that could easily be used by different code in
case we get interrupted, for example by a #MC or even page fault.

After discussing this with Ben, we figured it's best to reserve some more
space in the PACA and just shove off some vcpu state to there.

That way we can drastically improve the readability of the code, make it
less racy and less complex.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf
2010-01-08 02:58:03 +01:00
committed by Marcelo Tosatti
parent 992b5b29b5
commit 7e57cba060
10 changed files with 248 additions and 236 deletions
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20
arch/powerpc/include/asm/kvm_ppc.h
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@@ -98,34 +98,42 @@ extern void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu);
#ifdef CONFIG_PPC_BOOK3S
/* We assume we're always acting on the current vcpu */
static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
{
vcpu->arch.gpr[num] = val;
if ( num < 14 )
get_paca()->shadow_vcpu.gpr[num] = val;
else
vcpu->arch.gpr[num] = val;
}
static inline ulong kvmppc_get_gpr(struct kvm_vcpu *vcpu, int num)
{
return vcpu->arch.gpr[num];
if ( num < 14 )
return get_paca()->shadow_vcpu.gpr[num];
else
return vcpu->arch.gpr[num];
}
static inline void kvmppc_set_cr(struct kvm_vcpu *vcpu, u32 val)
{
vcpu->arch.cr = val;
get_paca()->shadow_vcpu.cr = val;
}
static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
{
return vcpu->arch.cr;
return get_paca()->shadow_vcpu.cr;
}
static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, u32 val)
{
vcpu->arch.xer = val;
get_paca()->shadow_vcpu.xer = val;
}
static inline u32 kvmppc_get_xer(struct kvm_vcpu *vcpu)
{
return vcpu->arch.xer;
return get_paca()->shadow_vcpu.xer;
}
#else