KVM: halt_polling: improve grow/shrink settings
Right now halt_poll_ns can be change during runtime. The grow and shrink factors can only be set during module load. Lets fix several aspects of grow shrink: - make grow/shrink changeable by root - make all variables unsigned int - read the variables once to prevent races Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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