linux-kernel - Re: [PATCH v3 9/9] KVM: riscv: selftests: Add sstc timer test

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Date:   Thu, 14 Sep 2023 10:52:15 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Andrew Jones <ajones@...tanamicro.com>
CC:     Haibo Xu <haibo1.xu@...el.com>, <xiaobo55x@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Vipin Sharma <vipinsh@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Thomas Huth <thuth@...hat.com>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <kvm@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
        <kvm-riscv@...ts.infradead.org>
Subject: Re: [PATCH v3 9/9] KVM: riscv: selftests: Add sstc timer test

On Thu, Sep 14, 2023 at 11:36:01AM +0200, Andrew Jones wrote:
> > +static inline void cpu_relax(void)
> > +{
> > +#ifdef __riscv_zihintpause
> > +	asm volatile("pause" ::: "memory");
> > +#else
> > +	/* Encoding of the pause instruction */
> > +	asm volatile(".4byte 0x100000F" ::: "memory");
> > +#endif
> > +}
> 
> cpu_relax() should go to include/riscv/processor.h

Can the one from asm/vdso/processor.h be reused, or are there special
considerations preventing that?

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