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 3EE8CC54EE9 for ; Fri, 16 Sep 2022 06:43:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230038AbiIPGnp (ORCPT ); Fri, 16 Sep 2022 02:43:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229915AbiIPGno (ORCPT ); Fri, 16 Sep 2022 02:43:44 -0400 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70E5EA2D88 for ; Thu, 15 Sep 2022 23:43:43 -0700 (PDT) Received: by mail-pj1-x102f.google.com with SMTP id o70-20020a17090a0a4c00b00202f898fa86so10023635pjo.2 for ; Thu, 15 Sep 2022 23:43:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=XafrQyV1Y8bilPnzIvj7YCctN4S0mQCoBp5K3q3Hq6I=; b=EAlsYtP0KasPGOytwKFV6O5CquVzTo7QRBtT0F9wTkJgFbhHmTXF9mHkuoiF3UJtBI imyOMALyT3iPmVwPIpPTcHWwRka+TRPpLd/NXyFAHy5FmuEBrF9fOOOQ0X0b858kFYs8 Fjm+HYATR8D6me9coHOPcfM/RTWhRGArVjhUe0BuavtjP3EpCERi7Zqbkx3iqfnMB0uQ no1WSBy5t7t5tmJfXwz79whqYF1wn3nrJKcA1RVdDI/YPDMH/g0rckdqfIG9NHX/wpN0 A6djnTVJoegqDk1ONijMPo0pteuoEsn76LI6rnOKbIKpU1fyYqItzqyzrgdid1+u2af+ 3MZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=XafrQyV1Y8bilPnzIvj7YCctN4S0mQCoBp5K3q3Hq6I=; b=uYZiYaj2CVK2G7ANDcsWt/xFfeMjkDRkEdJNkCA7gDoLKMBfUdrBJsxWG9JjiNfqeN xvdbtuiEA6Lb/8r1SVD6oC/6wrQNFV8H88PK5DveFIz29tfq96SoQBP/dQFEmzT+4vuh apcKrly47zPHtV4LE+Fa1KZ6y86ZAaRR4HozmQdYJkvRLy5P8uhSndWIahEM2tksIO3W NNPnYnUgR9QPDnJFmRqkWiVysuPZNwwDOjEYaVbKXFVXwTOi3ylhkKcCojtwuy/BViXj LDArdYB8nNX6bd9xvwR7XKMqr6r7UZHotyiGgb07FcFLTC4I6EbpcKbirZcNBPs3N8/r mLUg== X-Gm-Message-State: ACrzQf0Cogo2btv7MdaF5+TrSPNfV0VsO9a53yf5nEvAv0nd1iFdvI+J sxF93r6C2voFHG7ua5hHEgqdyA== X-Google-Smtp-Source: AMsMyM7cVJjO5hXpd9uJ6kurm9SpzSp4DpC+0Gpjd7g1HRdik9EjITEzUUx/nF+Ul6IfwHBhfvUJIA== X-Received: by 2002:a17:903:2015:b0:178:8022:ff1 with SMTP id s21-20020a170903201500b0017880220ff1mr2332456pla.18.1663310622963; Thu, 15 Sep 2022 23:43:42 -0700 (PDT) Received: from ThinkPad-T490.dc1.ventanamicro.com ([182.70.62.242]) by smtp.googlemail.com with ESMTPSA id p4-20020aa79e84000000b0053ea0e55574sm13501724pfq.187.2022.09.15.23.43.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Sep 2022 23:43:42 -0700 (PDT) From: Mayuresh Chitale To: Will Deacon , Julien Thierry Cc: Mayuresh Chitale , kvm@vger.kernel.org, Anup Patel Subject: [PATCH kvmtool 1/1] riscv: Add zihintpause extension support Date: Fri, 16 Sep 2022 12:13:24 +0530 Message-Id: <20220916064324.28229-2-mchitale@ventanamicro.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220916064324.28229-1-mchitale@ventanamicro.com> References: <20220916064324.28229-1-mchitale@ventanamicro.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The zihintpause extension allows software to use the PAUSE instruction to reduce energy consumption while executing spin-wait code sequences. Add the zihintpause extension to the device tree if it is supported by the host. Signed-off-by: Mayuresh Chitale --- riscv/fdt.c | 2 ++ riscv/include/asm/kvm.h | 1 + 2 files changed, 3 insertions(+) diff --git a/riscv/fdt.c b/riscv/fdt.c index e3d7717..7997edc 100644 --- a/riscv/fdt.c +++ b/riscv/fdt.c @@ -19,6 +19,8 @@ struct isa_ext_info { struct isa_ext_info isa_info_arr[] = { {"svpbmt", KVM_RISCV_ISA_EXT_SVPBMT}, {"sstc", KVM_RISCV_ISA_EXT_SSTC}, + {"Zihintpause", KVM_RISCV_ISA_EXT_ZIHINTPAUSE}, + }; static void dump_fdt(const char *dtb_file, void *fdt) diff --git a/riscv/include/asm/kvm.h b/riscv/include/asm/kvm.h index 7351417..f6f7963 100644 --- a/riscv/include/asm/kvm.h +++ b/riscv/include/asm/kvm.h @@ -98,6 +98,7 @@ enum KVM_RISCV_ISA_EXT_ID { KVM_RISCV_ISA_EXT_M, KVM_RISCV_ISA_EXT_SVPBMT, KVM_RISCV_ISA_EXT_SSTC, + KVM_RISCV_ISA_EXT_ZIHINTPAUSE, KVM_RISCV_ISA_EXT_MAX, }; -- 2.34.1