diff options
| author | Alexander Graf <agraf@suse.de> | 2010-01-08 02:58:03 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-03-01 12:35:48 -0300 |
| commit | 7e57cba06074da84d7c24d8c3f44040d2d8c88ac (patch) | |
| tree | e99519ca301b887de4d689421e7a954f1c7792e4 /arch/powerpc/include/asm/kvm_ppc.h | |
| parent | 992b5b29b5ae254c416c62faf98d59a6cf970027 (diff) | |
KVM: PPC: Use PACA backed shadow vcpu
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>
Diffstat (limited to 'arch/powerpc/include/asm/kvm_ppc.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_ppc.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index d60b2f0cdcf2..89c5d79c3479 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -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 |