Re: [PATCH] IB/core: Add mitigation for Spectre V1

2019-07-30 Thread Ira Weiny
On Tue, Jul 30, 2019 at 06:52:12PM -0500, Gustavo A. R. Silva wrote: > > > On 7/30/19 3:24 PM, Tony Luck wrote: > > Some processors may mispredict an array bounds check and > > speculatively access memory that they should not. With > > a user supplied array index we like to play things safe > >

Re: [PATCH] IB/core: Add mitigation for Spectre V1

2019-07-30 Thread Gustavo A. R. Silva
On 7/30/19 3:24 PM, Tony Luck wrote: > Some processors may mispredict an array bounds check and > speculatively access memory that they should not. With > a user supplied array index we like to play things safe > by masking the value with the array size before it is > used as an index. > >

Re: [PATCH] IB/core: Add mitigation for Spectre V1

2019-07-30 Thread Ira Weiny
On Tue, Jul 30, 2019 at 01:24:07PM -0700, Tony Luck wrote: > Some processors may mispredict an array bounds check and > speculatively access memory that they should not. With > a user supplied array index we like to play things safe > by masking the value with the array size before it is > used as

[PATCH] IB/core: Add mitigation for Spectre V1

2019-07-30 Thread Tony Luck
Some processors may mispredict an array bounds check and speculatively access memory that they should not. With a user supplied array index we like to play things safe by masking the value with the array size before it is used as an index. Signed-off-by: Tony Luck --- [I don't have h/w, so just