KVM: PPC: Fix a mmio_host_swabbed uninitialized usage issue

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When KVM emulates VMX store, it will invoke kvmppc_get_vmx_data() to
retrieve VMX reg val. kvmppc_get_vmx_data() will check mmio_host_swabbed
to decide which double word of vr[] to be used. But the
mmio_host_swabbed can be uninitialized during VMX store procedure:

kvmppc_emulate_loadstore
	\- kvmppc_handle_store128_by2x64
		\- kvmppc_get_vmx_data

So vcpu->arch.mmio_host_swabbed is not meant to be used at all for
emulation of store instructions, and this patch makes that true for
VMX stores. This patch also initializes mmio_host_swabbed to avoid
possible future problems.

Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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Simon Guo 2018-05-07 14:20:09 +08:00 • committed by Paul Mackerras

parent 173c520a04

commit f19d1f367a

2 changed files with 2 additions and 1 deletions

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1

arch/powerpc/kvm/emulate_loadstore.c

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2

arch/powerpc/kvm/powerpc.c

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