linux-kernel - Re: [PATCH v2 1/1] powerpc/kvm: Fix mask size for emulated msgsndp

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Date:   Tue, 15 Dec 2020 13:15:23 +1100
From:   Paul Mackerras <paulus@...abs.org>
To:     Leonardo Bras <leobras.c@...il.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] powerpc/kvm: Fix mask size for emulated msgsndp

On Tue, Dec 08, 2020 at 06:57:08PM -0300, Leonardo Bras wrote:
> According to ISAv3.1 and ISAv3.0b, the msgsndp is described to split RB in:
> msgtype <- (RB) 32:36
> payload <- (RB) 37:63
> t       <- (RB) 57:63
> 
> The current way of getting 'msgtype', and 't' is missing their MSB:
> msgtype: ((arg >> 27) & 0xf) : Gets (RB) 33:36, missing bit 32
> t:       (arg &= 0x3f)       : Gets (RB) 58:63, missing bit 57
> 
> Fixes this by applying the correct mask.
> 
> Signed-off-by: Leonardo Bras <leobras.c@...il.com>

Acked-by: Paul Mackerras <paulus@...abs.org>