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| author | Alexander Graf <agraf@suse.de> | 2018-01-31 22:24:58 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2018-02-01 03:35:33 +0100 |
| commit | 07ae5389e98c53bb9e9f308fce9c903bc3ee7720 (patch) | |
| tree | 42e29efe5409097e294b425a1e62cadb0b05b19a /arch/powerpc/include/asm | |
| parent | KVM: PPC: Book3S HV: Drop locks before reading guest memory (diff) | |
| download | linux-07ae5389e98c53bb9e9f308fce9c903bc3ee7720.tar.xz linux-07ae5389e98c53bb9e9f308fce9c903bc3ee7720.zip | |
KVM: PPC: Book3S PR: Fix svcpu copying with preemption enabled
When copying between the vcpu and svcpu, we may get scheduled away onto
a different host CPU which in turn means our svcpu pointer may change.
That means we need to atomically copy to and from the svcpu with preemption
disabled, so that all code around it always sees a coherent state.
Reported-by: Simon Guo <wei.guo.simon@gmail.com>
Fixes: 3d3319b45eea ("KVM: PPC: Book3S: PR: Enable interrupts earlier")
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_book3s.h | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 9a667007bff8..376ae803b69c 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -249,10 +249,8 @@ extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd); extern void kvmppc_pr_init_default_hcalls(struct kvm *kvm); extern int kvmppc_hcall_impl_pr(unsigned long cmd); extern int kvmppc_hcall_impl_hv_realmode(unsigned long cmd); -extern void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu, - struct kvm_vcpu *vcpu); -extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu, - struct kvmppc_book3s_shadow_vcpu *svcpu); +extern void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu); +extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu); extern int kvm_irq_bypass; static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu) |