RE: [PATCH v4 2/2] xen/arm: Throw messages for unknown FP/SIMD implement ID

2020-08-27 Thread Wei Chen
Hi Bertand, > -Original Message- > From: Bertrand Marquis > Sent: 2020年8月27日 22:13 > To: Wei Chen > Cc: Xen-devel ; sstabell...@kernel.org; > jul...@xen.org; Andre Przywara ; Penny Zheng > ; Kaly Xin ; nd > Subject: Re: [PATCH v4 2/2] xen/arm: Throw messag

Re: [PATCH v4 2/2] xen/arm: Throw messages for unknown FP/SIMD implement ID

2020-08-27 Thread Julien Grall
Hi, On 25/08/2020 17:06, Wei Chen wrote: Arm ID_AA64PFR0_EL1 register provides two fields to describe CPU FP/SIMD implementations. Currently, we exactly know the meaning of 0x0, 0x1 and 0xf of these fields. Xen treats value < 8 as FP/SIMD features presented. If there is a value 0x2 bumped in the

Re: [PATCH v4 2/2] xen/arm: Throw messages for unknown FP/SIMD implement ID

2020-08-27 Thread Bertrand Marquis
> On 25 Aug 2020, at 17:06, Wei Chen wrote: > > Arm ID_AA64PFR0_EL1 register provides two fields to describe CPU > FP/SIMD implementations. Currently, we exactly know the meaning of > 0x0, 0x1 and 0xf of these fields. Xen treats value < 8 as FP/SIMD > features presented. If there is a value 0x