Re: [RFC v6 13/62] powerpc: track allocation status of all pkeys
From: Thiago Jung Bauermann <hidden>
Date: 2017-07-27 14:02:04
Also in:
linux-arch, linux-mm, lkml
Hello Ram, I'm still going through the patches and haven't formed a full picture of the feature in my mind yet, so my comments today won't be particularly insightful... But hopefully the comments that I currently have will be helpful anyway. Ram Pai [off-list ref] writes:
quoted hunk ↗ jump to hunk
diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h index 203d7de..09b268e 100644 --- a/arch/powerpc/include/asm/pkeys.h +++ b/arch/powerpc/include/asm/pkeys.h@@ -2,21 +2,87 @@ #define _ASM_PPC64_PKEYS_H extern bool pkey_inited; -#define ARCH_VM_PKEY_FLAGS 0 +#define arch_max_pkey() 32 +#define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \ + VM_PKEY_BIT3 | VM_PKEY_BIT4) +/* + * Bits are in BE format. + * NOTE: key 31, 1, 0 are not used. + * key 0 is used by default. It give read/write/execute permission. + * key 31 is reserved by the hypervisor. + * key 1 is recommended to be not used. + * PowerISA(3.0) page 1015, programming note. + */ +#define PKEY_INITIAL_ALLOCAION 0xc0000001
There's a typo in the macro name, should be "ALLOCATION". -- Thiago Jung Bauermann IBM Linux Technology Center