On 29/03/2016 19:43, Xiao Guangrong wrote: > Based on the SDM: > PK flag (bit 5). > This flag is 1 if (1) IA32_EFER.LMA = CR4.PKE = 1; (2) the access > causing the page-fault exception was a data access; (3) the linear > address was a user-mode address with protection key i; and (5) the PKRU > register (see Section 4.6.2) is such that either (a) ADi = 1; or (b) the > following all hold: (i) WDi = 1; (ii) the access is a write access; and > (iii) either CR0.WP = 1 or the access causing the page-fault exception > was a user-mode access. > > So I think PKEY check and ordinary check are independent, i.e, PFEC.PKEY > may be set even if the on permission on the page table is not adequate. x86/access.flat is currently using the "other" definition, i.e., PFEC.PK is only set if W=1 or CR0.WP=0 && PFEC.U=0 or PFEC.W=0. Can you use it (with ept=1 of course) to check what the processor is doing? Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
