KVM: MTRR: observe maxphyaddr from guest CPUID, not host

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Conversion of MTRRs to ranges used the maxphyaddr from the boot CPU.
This is wrong, because var_mtrr_range's mask variable then is discontiguous
(like FF00FFFF000, where the first run of 0s corresponds to the bits
between host and guest maxphyaddr).  Instead always set up the masks
to be full 64-bit values---we know that the reserved bits at the top
are zero, and we can restore them when reading the MSR.  This way
var_mtrr_range gets a mask that just works.

Fixes: a13842dc66
Cc: qemu-stable@nongnu.org
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107561
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Paolo Bonzini 2015-12-14 16:57:31 +01:00

parent a7f2d78657

commit fa7c4ebd5a

1 changed files with 7 additions and 2 deletions

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arch/x86/kvm/mtrr.c

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