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Alexey Kardashevskiy authored
At the moment pages used for TCE tables (in addition to pages addressed by TCEs) are not counted in locked_vm counter so a malicious userspace tool can call ioctl(KVM_CREATE_SPAPR_TCE) as many times as RLIMIT_NOFILE and lock a lot of memory. This adds counting for pages used for TCE tables. This counts the number of pages required for a table plus pages for the kvmppc_spapr_tce_table struct (TCE table descriptor) itself. This changes release_spapr_tce_table() to store @npages on stack to avoid calling kvmppc_stt_npages() in the loop (tiny optimization, probably). This does not change the amount of used memory. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Paul Mackerras <paulus@samba.org>
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