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powerpc/kvm: Fix magic page vs. 32-bit RTAS on ppc64

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When the kernel calls into RTAS, it switches to 32-bit mode. The
magic page was is longer accessible in that case, causing the
patched instructions in the RTAS call wrapper to crash.

This fixes it by making available a 32-bit mapping of the magic
page in that case. This mapping is flushed whenever we switch
the kernel back to 64-bit mode.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[agraf: add a check if the magic page is mapped]
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Benjamin Herrenschmidt
2012-03-13 21:52:44 +00:00
committed by Avi Kivity
parent 966cd0f3bd
commit bbcc9c0669
2 changed files with 21 additions and 0 deletions
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3
arch/powerpc/kvm/book3s.c
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@@ -291,6 +291,9 @@ pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
{
ulong mp_pa = vcpu->arch.magic_page_pa;
if (!(vcpu->arch.shared->msr & MSR_SF))
mp_pa = (uint32_t)mp_pa;
/* Magic page override */
if (unlikely(mp_pa) &&
unlikely(((gfn << PAGE_SHIFT) & KVM_PAM) ==