VLV_PCBR
pcbr = intel_uncore_read(uncore, VLV_PCBR);
intel_uncore_write(uncore, VLV_PCBR, pctx_paddr);
pcbr = intel_uncore_read(uncore, VLV_PCBR);
intel_uncore_write(uncore, VLV_PCBR, pctx_paddr);
s->pcbr = intel_uncore_read(uncore, VLV_PCBR);
intel_uncore_write(uncore, VLV_PCBR, s->pcbr);