From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Thu, 19 Dec 2013 17:28:51 +0000 (-0200)
Subject: KVM: MMU: handle invalid root_hpa at __direct_map
X-Git-Tag: v3.2.57~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=738638c53d523683bc4b761be9a58da843f26a10;p=pandora-kernel.git

KVM: MMU: handle invalid root_hpa at __direct_map

commit 989c6b34f6a9480e397b170cc62237e89bf4fdb9 upstream.

It is possible for __direct_map to be called on invalid root_hpa
(-1), two examples:

1) try_async_pf -> can_do_async_pf
    -> vmx_interrupt_allowed -> nested_vmx_vmexit
2) vmx_handle_exit -> vmx_interrupt_allowed -> nested_vmx_vmexit

Then to load_vmcs12_host_state and kvm_mmu_reset_context.

Check for this possibility, let fault exception be regenerated.

BZ: https://bugzilla.redhat.com/show_bug.cgi?id=924916

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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