KVM: x86: Fix guest debug across vcpu INIT reset

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If we reset a vcpu on INIT, we so far overwrote dr7 as provided by
KVM_SET_GUEST_DEBUG, and we also cleared switch_db_regs unconditionally.

Fix this by saving the dr7 used for guest debugging and calculating the
effective register value as well as switch_db_regs on any potential
change. This will change to focus of the set_guest_debug vendor op to
update_dp_bp_intercept.

Found while trying to stop on start_secondary.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

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This commit is contained in:

Jan Kiszka 2012-09-21 05:42:55 +02:00 • committed by Avi Kivity

parent 7a84428af7

commit c863901075

4 changed files with 24 additions and 43 deletions

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4

arch/x86/include/asm/kvm_host.h

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23

arch/x86/kvm/svm.c

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14

arch/x86/kvm/vmx.c

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26

arch/x86/kvm/x86.c

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