Re: [PATCH 05/26] arm64: Document SW reserved PTE/PMD bits in Stage-2 descriptors
From: Andrew Scull <hidden>
Date: 2020-05-06 10:11:30
Also in:
kvm, kvmarm
On Wed, May 06, 2020 at 10:39:59AM +0100, Marc Zyngier wrote:
Hi Andrew, On 2020-05-05 16:59, Andrew Scull wrote:quoted
On Wed, Apr 22, 2020 at 01:00:29PM +0100, Marc Zyngier wrote:quoted
Advertise bits [58:55] as reserved for SW in the S2 descriptors. Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/include/asm/pgtable-hwdef.h | 2 ++ 1 file changed, 2 insertions(+)diff --git a/arch/arm64/include/asm/pgtable-hwdef.hb/arch/arm64/include/asm/pgtable-hwdef.h index 6bf5e650da788..7eab0d23cdb52 100644--- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h@@ -177,10 +177,12 @@ #define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[2:1] */ #define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */ #define PTE_S2_XN (_AT(pteval_t, 2) << 53) /* XN[1:0] */ +#define PTE_S2_SW_RESVD (_AT(pteval_t, 15) << 55) /* Reserved forSW */ #define PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[2:1] */ #define PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */ #define PMD_S2_XN (_AT(pmdval_t, 2) << 53) /* XN[1:0] */ +#define PMD_S2_SW_RESVD (_AT(pmdval_t, 15) << 55) /* Reserved for SW */ #define PUD_S2_RDONLY (_AT(pudval_t, 1) << 6) /* HAP[2:1] */ #define PUD_S2_RDWR (_AT(pudval_t, 3) << 6) /* HAP[2:1] */ -- 2.26.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarmThis is consistent with "Attribute fields in stage 1 VMSAv8-64 Block and Page descriptors"Do you mean "stage 2" instead? The reserved bits are the same, but I want to be sure we have looked at the same thing (ARM DDI 0487F.a, D5-2603).
My turn for the copy-paste bug, yes "Attribute fields in stage 2 VMSAv8-64 Block and Page descriptors". And conviniently the same bits are reserved for SW in both. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel