From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50D00C433F5 for ; Wed, 4 May 2022 02:14:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343897AbiEDCSZ (ORCPT ); Tue, 3 May 2022 22:18:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35692 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343873AbiEDCSY (ORCPT ); Tue, 3 May 2022 22:18:24 -0400 Received: from mail-yb1-xb2c.google.com (mail-yb1-xb2c.google.com [IPv6:2607:f8b0:4864:20::b2c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C50F92A72F for ; Tue, 3 May 2022 19:14:49 -0700 (PDT) Received: by mail-yb1-xb2c.google.com with SMTP id j2so245387ybu.0 for ; Tue, 03 May 2022 19:14:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=atishpatra.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=cI3EnEiByhbyzhbmPT2Do41vovNa54bp0yAEgXmkBD8=; b=mmI6KLpp+c3z+QrHZdFKRJi6VoSF3GbpLtggCsIulsB7AubvolFrXmPGCEXTxlZANN f3DhMSm2PnbBoAetcz8hC4H9bKeaHz8TGfKNNSG94OErYzJkMD2FdlSJfm7Xj0+v6vUA nsviC93U75RbKSwrPBpYDtKRlXaAU8h4VESOo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=cI3EnEiByhbyzhbmPT2Do41vovNa54bp0yAEgXmkBD8=; b=AtZVsIWygMr4oa9kKrE4jfxbtOAKR5XIEIDpOQ70AtgeDxrLzoH//G0lNIOWXsNggM uCZ7vBnAkI/4Tk96+cDJivgk1NwumVl6hhzXBXzeG7pT3eMxZ7xLByui7BxHNY+7fFkd ZKhMQTZbEJeWCK/ulgMFNVvLuFraUTZrXHErZG9MKZB6JNhpzVNgnWwe4PC6Hsj+mmdv s6IIAJn6VfeenXbfo32+KN6zI7G9W0lnA7p5k7e93wzXg9E8OIIzyMJqvZsw1S2BFEYR D8tMnWbeOhmwFqEI2qis0RrvmWRR6BGZk11r7HPaLY+MO2Nfl4zkSLwwOzYPexRaCsoE j5aw== X-Gm-Message-State: AOAM533Rg46m4DPzajo++Q7iqlh5TJKQ6lleIeCvxN/42jiQb8HXcTC1 2qjOp47KyXsHfrPIimwCmC02AFYNluOyBtm6t+HP X-Google-Smtp-Source: ABdhPJzutpVfXiertcAqEmQCd3u67RbEUlBKorJvKcoQ99nnjZTFxngHiLoSZ+nRRmPEImrirNk0UXweW8E5SV84HvY= X-Received: by 2002:a25:9247:0:b0:645:ddd5:a182 with SMTP id e7-20020a259247000000b00645ddd5a182mr16046065ybo.289.1651630489026; Tue, 03 May 2022 19:14:49 -0700 (PDT) MIME-Version: 1.0 References: <20220420112450.155624-1-apatel@ventanamicro.com> <20220420112450.155624-4-apatel@ventanamicro.com> In-Reply-To: <20220420112450.155624-4-apatel@ventanamicro.com> From: Atish Patra Date: Tue, 3 May 2022 19:14:38 -0700 Message-ID: Subject: Re: [PATCH v2 3/7] RISC-V: KVM: Treat SBI HFENCE calls as NOPs To: Anup Patel Cc: Paolo Bonzini , Palmer Dabbelt , Paul Walmsley , Alistair Francis , Anup Patel , KVM General , kvm-riscv@lists.infradead.org, linux-riscv , "linux-kernel@vger.kernel.org List" Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 20, 2022 at 4:25 AM Anup Patel wrote: > > We should treat SBI HFENCE calls as NOPs until nested virtualization > is supported by KVM RISC-V. This will help us test booting a hypervisor > under KVM RISC-V. > > Signed-off-by: Anup Patel > --- > arch/riscv/kvm/vcpu_sbi_replace.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c > index 0f217365c287..3c1dcd38358e 100644 > --- a/arch/riscv/kvm/vcpu_sbi_replace.c > +++ b/arch/riscv/kvm/vcpu_sbi_replace.c > @@ -117,7 +117,11 @@ static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run > case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID: > case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA: > case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID: > - /* TODO: implement for nested hypervisor case */ > + /* > + * Until nested virtualization is implemented, the > + * SBI HFENCE calls should be treated as NOPs > + */ > + break; > default: > ret = -EOPNOTSUPP; > } > -- > 2.25.1 > Reviewed-by: Atish Patra -- Regards, Atish