Revert "kvm: x86: optimize dr6 restore"

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This reverts commit 0e0a53c551.

As Christian Ehrhardt noted:

  The most common case is that vcpu->arch.dr6 and the host's %dr6 value
  are not related at all because ->switch_db_regs is zero. To do this
  all correctly, we must handle the case where the guest leaves an arbitrary
  unused value in vcpu->arch.dr6 before disabling breakpoints again.

  However, this means that vcpu->arch.dr6 is not suitable to detect the
  need for a %dr6 clear.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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Radim Krčmář 2018-10-23 16:31:38 +02:00

parent 574c0cfbc7

commit f9dcf08e20

1 changed files with 4 additions and 9 deletions

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arch/x86/kvm/x86.c

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