Re: [PATCH v4 22/22] arm64: Add work around for Arm Cortex-A55 Erratum 1024718

2018-03-22 Thread Suzuki K Poulose
On 21/03/18 15:31, Dave Martin wrote: On Tue, Mar 13, 2018 at 11:51:20AM +, Suzuki K Poulose wrote: Some variants of the Arm Cortex-55 cores (r0p0, r0p1, r1p0) suffer from an erratum 1024718, which causes incorrect updates when DBM/AP bits in a page table entry is modified without a

Re: [PATCH v4 22/22] arm64: Add work around for Arm Cortex-A55 Erratum 1024718

2018-03-22 Thread Suzuki K Poulose
On 21/03/18 15:31, Dave Martin wrote: On Tue, Mar 13, 2018 at 11:51:20AM +, Suzuki K Poulose wrote: Some variants of the Arm Cortex-55 cores (r0p0, r0p1, r1p0) suffer from an erratum 1024718, which causes incorrect updates when DBM/AP bits in a page table entry is modified without a

Re: [PATCH v4 22/22] arm64: Add work around for Arm Cortex-A55 Erratum 1024718

2018-03-21 Thread Dave Martin
On Tue, Mar 13, 2018 at 11:51:20AM +, Suzuki K Poulose wrote: > Some variants of the Arm Cortex-55 cores (r0p0, r0p1, r1p0) suffer > from an erratum 1024718, which causes incorrect updates when DBM/AP > bits in a page table entry is modified without a break-before-make > sequence. The work

Re: [PATCH v4 22/22] arm64: Add work around for Arm Cortex-A55 Erratum 1024718

2018-03-21 Thread Dave Martin
On Tue, Mar 13, 2018 at 11:51:20AM +, Suzuki K Poulose wrote: > Some variants of the Arm Cortex-55 cores (r0p0, r0p1, r1p0) suffer > from an erratum 1024718, which causes incorrect updates when DBM/AP > bits in a page table entry is modified without a break-before-make > sequence. The work

[PATCH v4 22/22] arm64: Add work around for Arm Cortex-A55 Erratum 1024718

2018-03-13 Thread Suzuki K Poulose
Some variants of the Arm Cortex-55 cores (r0p0, r0p1, r1p0) suffer from an erratum 1024718, which causes incorrect updates when DBM/AP bits in a page table entry is modified without a break-before-make sequence. The work around is to skip enabling the hardware DBM feature on the affected cores.

[PATCH v4 22/22] arm64: Add work around for Arm Cortex-A55 Erratum 1024718

2018-03-13 Thread Suzuki K Poulose
Some variants of the Arm Cortex-55 cores (r0p0, r0p1, r1p0) suffer from an erratum 1024718, which causes incorrect updates when DBM/AP bits in a page table entry is modified without a break-before-make sequence. The work around is to skip enabling the hardware DBM feature on the affected cores.