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authorPaolo Bonzini <pbonzini@redhat.com>2015-05-18 15:03:39 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2015-06-05 17:26:37 +0200
commit699023e239658e62da6f42f47d31b54788521ec1 (patch)
tree01dcd8c0ad2100dc1c8a4834358a0fb0d2f0fa1c /Documentation/virtual/kvm/mmu.txt
parentKVM: x86: work on all available address spaces (diff)
downloadlinux-dev-699023e239658e62da6f42f47d31b54788521ec1.tar.xz
linux-dev-699023e239658e62da6f42f47d31b54788521ec1.zip
KVM: x86: add SMM to the MMU role, support SMRAM address space
This is now very simple to do. The only interesting part is a simple trick to find the right memslot in gfn_to_rmap, retrieving the address space from the spte role word. The same trick is used in the auditing code. The comment on top of union kvm_mmu_page_role has been stale forever, so remove it. Speaking of stale code, remove pad_for_nice_hex_output too: it was splitting the "access" bitfield across two bytes and thus had effectively turned into pad_for_ugly_hex_output. Reviewed-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virtual/kvm/mmu.txt')
-rw-r--r--Documentation/virtual/kvm/mmu.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt
index c59bd9bc41ef..3a4d681c3e98 100644
--- a/Documentation/virtual/kvm/mmu.txt
+++ b/Documentation/virtual/kvm/mmu.txt
@@ -173,6 +173,12 @@ Shadow pages contain the following information:
Contains the value of cr4.smap && !cr0.wp for which the page is valid
(pages for which this is true are different from other pages; see the
treatment of cr0.wp=0 below).
+ role.smm:
+ Is 1 if the page is valid in system management mode. This field
+ determines which of the kvm_memslots array was used to build this
+ shadow page; it is also used to go back from a struct kvm_mmu_page
+ to a memslot, through the kvm_memslots_for_spte_role macro and
+ __gfn_to_memslot.
gfn:
Either the guest page table containing the translations shadowed by this
page, or the base page frame for linear translations. See role.direct.