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Subject: Re: [PATCH v7 10/21] RISC-V: KVM: Handle MMIO exits for VCPU
To:     Anup Patel <anup@brainfault.org>
Cc:     Anup Patel <Anup.Patel@wdc.com>,
        Palmer Dabbelt <palmer@sifive.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Radim K <rkrcmar@redhat.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Alexander Graf <graf@amazon.com>,
        Atish Patra <Atish.Patra@wdc.com>,
        Alistair Francis <Alistair.Francis@wdc.com>,
        Damien Le Moal <Damien.LeMoal@wdc.com>,
        Christoph Hellwig <hch@infradead.org>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "linux-riscv@lists.infradead.org" <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20190904161245.111924-1-anup.patel@wdc.com>
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 <8c44ac8a-3fdc-b9dd-1815-06e86cb73047@redhat.com>
 <CAAhSdy1-1yxMnjzppmUBxtSOAuwWaPtNZwW+QH1O7LAnEVP8pg@mail.gmail.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
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Date:   Mon, 23 Sep 2019 15:33:14 +0200
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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