From patchwork Wed Aug 2 16:46:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 13338557 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A8296C001E0 for ; Wed, 2 Aug 2023 16:52:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ACrKO1m7tJSFIcjFeIiBnjuqRJcUPhhhqPxHAixeQbg=; b=bg/7BmKXF+587N lwjM8ln8qHl6Cb1LSc6ui8uUZwddv/IQSuN4XJHmZmATaEAW6HjYQv1FZhXnv4emZZ4rCDL8OgUi6 ZCelk2jQ0XyD9WuFFcskyKzRQBIO7alZyLE+XSjFbZu5mdc16R95LfS7XE8WGcwhwVM+Zug5Koj3e G51JYTUsIIk0QNosrDyQoHBZ9Giid+u5v28oBg3ZIHt5HausCRNjdYpimUHs6iDFaQ1GNbozr5jGL mPw3HmYVV6nVvbnUxe8F+WIU1uYsRTWyOixRMX4PyFHL2DmBtZvA+dGnWlX7NhzRhPBMkNUlPo8EP X6AQePCGKSz0Oo2AYGnw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qRF4s-005PfJ-0Q; Wed, 02 Aug 2023 16:52:02 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qRF4p-005Pdf-2w for linux-riscv@lists.infradead.org; Wed, 02 Aug 2023 16:52:01 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 671B361A40; Wed, 2 Aug 2023 16:51:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17FD1C433C8; Wed, 2 Aug 2023 16:51:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1690995118; bh=//LTBV3xtswilX9AAt8SaQJo9J60NYzf9Q4p8qd3nq0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ec6jPCAuR3FS/NUe+ahVBDwwzJtZT0QQx4PS1ef6BZOb0kZD/ocsGIn873rcg1aCT MWEqlqSuKzbbkoYLVzOfNKiPREf+rHk7IrgySkp7nO5mnusalgpof9DWuqunetYYtm FaYi6LjVpusePPnVQMcBZPyO+I+2iyFf9vezvM+xOOsEFDvGSnVbvVxQNTA+WHssLO VJFkpJfObVNT7vGwiRAg2HTPJG3CUOEhrh+yQDjMaKZMvsSV1dujW2vwC814Y+dRvJ s9dCGuyyt9dVGl4bHJIrQXCVb8nVp8JDSzeLvom7te0x87nFPR7bmFcbiyikd54Nn+ G8435ns6CyMDw== From: guoren@kernel.org To: paul.walmsley@sifive.com, anup@brainfault.org, peterz@infradead.org, mingo@redhat.com, will@kernel.org, palmer@rivosinc.com, longman@redhat.com, boqun.feng@gmail.com, tglx@linutronix.de, paulmck@kernel.org, rostedt@goodmis.org, rdunlap@infradead.org, catalin.marinas@arm.com, conor.dooley@microchip.com, xiaoguang.xing@sophgo.com, bjorn@rivosinc.com, alexghiti@rivosinc.com, keescook@chromium.org, greentime.hu@sifive.com, ajones@ventanamicro.com, jszhang@kernel.org, wefu@redhat.com, wuwei2016@iscas.ac.cn Cc: linux-arch@vger.kernel.org, linux-riscv@lists.infradead.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-csky@vger.kernel.org, Guo Ren , Guo Ren Subject: [PATCH V10 16/19] RISC-V: paravirt: pvqspinlock: Add kconfig entry Date: Wed, 2 Aug 2023 12:46:58 -0400 Message-Id: <20230802164701.192791-17-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20230802164701.192791-1-guoren@kernel.org> References: <20230802164701.192791-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230802_095200_007233_012B0959 X-CRM114-Status: UNSURE ( 9.88 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Guo Ren Add kconfig entry for paravirt_spinlock, an unfair qspinlock virtualization-friendly backend, by halting the virtual CPU rather than spinning. Signed-off-by: Guo Ren Signed-off-by: Guo Ren --- arch/riscv/Kconfig | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 42ae45c42b4d..13f345b54581 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -770,6 +770,7 @@ config RELOCATABLE config PARAVIRT bool "Enable paravirtualization code" depends on RISCV_SBI + select PARAVIRT_SPINLOCKS default y help This changes the kernel so it can modify itself when it is run @@ -788,6 +789,17 @@ config PARAVIRT_TIME_ACCOUNTING If in doubt, say N here. +config PARAVIRT_SPINLOCKS + bool "Paravirtualization layer for spinlocks" + depends on PARAVIRT && SMP + help + Paravirtualized spinlocks allow a unfair qspinlock to replace the + test-set kvm-guest virt spinlock implementation with something + virtualization-friendly, for example, halt the virtual CPU rather + than spinning. + + If you are unsure how to answer this question, answer Y. + endmenu # "Kernel features" menu "Boot options"