linux-kernel - Re: [PATCH v7 10/21] RISC-V: KVM: Handle MMIO exits for VCPU

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Message-ID: <45fc3ee5-0f68-4e94-cfb3-0727ca52628f@redhat.com>
Date:   Mon, 23 Sep 2019 15:33:14 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Anup Patel <anup@...infault.org>
Cc:     Anup Patel <Anup.Patel@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Radim K <rkrcmar@...hat.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexander Graf <graf@...zon.com>,
        Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Christoph Hellwig <hch@...radead.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 10/21] RISC-V: KVM: Handle MMIO exits for VCPU

On 23/09/19 15:09, Anup Patel wrote:
>>> +#ifndef CONFIG_RISCV_ISA_C
>>> +                     "li %[tilen], 4\n"
>>> +#else
>>> +                     "li %[tilen], 2\n"
>>> +#endif
>>
>> Can you use an assembler directive to force using a non-compressed
>> format for ld and lw?  This would get rid of tilen, which is costing 6
>> bytes (if I did the RVC math right) in order to save two. :)
> 
> I tried looking for it but could not find any assembler directive
> to selectively turn-off instruction compression.

".option norvc"?

Paolo