kvm: x86: fix RSM when PCID is non-zero

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commit fae1a3e775 upstream.

rsm_load_state_64() and rsm_enter_protected_mode() load CR3, then
CR4 & ~PCIDE, then CR0, then CR4.

However, setting CR4.PCIDE fails if CR3[11:0] != 0.  It's probably easier
in the long run to replace rsm_enter_protected_mode() with an emulator
callback that sets all the special registers (like KVM_SET_SREGS would
do).  For now, set the PCID field of CR3 only after CR4.PCIDE is 1.

Reported-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Fixes: 660a5d517a
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Paolo Bonzini 2017-12-21 00:49:14 +01:00 • committed by Greg Kroah-Hartman

parent e5c73b3b60

commit 18276e9bcd

1 changed files with 25 additions and 7 deletions

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arch/x86/kvm/emulate.c

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