From patchwork Fri Apr 14 23:44:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13212153 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 2431AC77B71 for ; Fri, 14 Apr 2023 23:48:06 +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:Date:MIME-Version:References:Subject:Cc :To:From:Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Owner; bh=LzjDYUNEq8erJaaDcnogEts36DjMjNI2lVNeXnjL6VE=; b=Uq8lhdbD6Y9h5N que42R209Em9/MKgAVS/9ORfgEWBZxFuTAHomOFboUtA2ZeWCXA1QxgU9gMefCmAy0rVAsPQDsn/B 5uNSkfNNLGlj+zoYAzk4Q/ebuG4S3KMUd+CvkXRSLx5/pifYNNI1VFs8fUpqtYDD1kbXuUuJx+/Q2 BU9piroxvPNDvL7OQ5OqwlY0qiIoGj2uOZgSGW3K5+eBBas16bj0r7fL8hmcOk/QXwMRFir3cV50A xemutPBidLKm/KVgAiGy3fAkvG6cNQ819nVJJBXYXLJvEDzZHtjAq1jxbOk5FP9DYE38YbtTo/VJw uLgjSZXSD2f2h6rgdz4A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pnT8J-00AmLY-33; Fri, 14 Apr 2023 23:47:11 +0000 Received: from galois.linutronix.de ([193.142.43.55]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pnT5u-00AkHp-3A; Fri, 14 Apr 2023 23:44:44 +0000 Message-ID: <20230414232310.256412375@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1681515881; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=e1FMo66EmKhD6c9vNMbCMEr10b7nb30z1HTBJhSwsws=; b=gZ0HEhv3acCl5QBYyuBxsWswUfiT2pTSEiPx8KAuYf607AwMRXvsLBlYW5dljp8oWs/ntm Rl62blc06B+wdYag6mxiaHF4d6UazbaaiGafHMeetJ/A7Hs5RVhUzMngs/dEe59idC0O2F aA4jOVKszqOh4s2mn+PKplYpnPle5vYAOnMKw27lKXhJvIh/kbhLy4lRj7cXXA/G581Bej PsarGBYF6AEmBjKJMVj8L9q7SGw5rle2qMtTuVh6V6kezaC/bwaovVLX9d1Zsm+GX8ANmu PhMCi/IYxY/Oqm30JTDcZDBgs/Y7EGdHwcz8miDR/Arr0Wrr//IGKwmjd5YAMQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1681515881; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=e1FMo66EmKhD6c9vNMbCMEr10b7nb30z1HTBJhSwsws=; b=4fNwIQeLJaYUXs5/LQAEGEGLbWkObI//eYOHt1swXrTx799wwKeZFlTzry5MJCiAr70s7q ypFOiCNeSLElyzBg== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, David Woodhouse , Andrew Cooper , Brian Gerst , "Arjan van de Veen" , Paolo Bonzini , Paul McKenney , Tom Lendacky , Sean Christopherson , Oleksandr Natalenko , Paul Menzel , "Guilherme G. Piccoli" , Piotr Gorski , Juergen Gross , Boris Ostrovsky , xen-devel@lists.xenproject.org, David Woodhouse , Usama Arif , Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Guo Ren , linux-csky@vger.kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Mark Rutland , Sabin Rapan Subject: [patch 17/37] x86/xen/hvm: Get rid of DEAD_FROZEN handling References: <20230414225551.858160935@linutronix.de> MIME-Version: 1.0 Date: Sat, 15 Apr 2023 01:44:41 +0200 (CEST) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230414_164443_187285_FE296C3E X-CRM114-Status: GOOD ( 11.48 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org No point in this conditional voodoo. Un-initializing the lock mechanism is safe to be called unconditionally even if it was already invoked when the CPU died. Remove the invocation of xen_smp_intr_free() as that has been already cleaned up in xen_cpu_dead_hvm(). Signed-off-by: Thomas Gleixner Cc: Juergen Gross Cc: Boris Ostrovsky Cc: xen-devel@lists.xenproject.org --- arch/x86/xen/enlighten_hvm.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -161,13 +161,12 @@ static int xen_cpu_up_prepare_hvm(unsign int rc = 0; /* - * This can happen if CPU was offlined earlier and - * offlining timed out in common_cpu_die(). + * If a CPU was offlined earlier and offlining timed out then the + * lock mechanism is still initialized. Uninit it unconditionally + * as it's safe to call even if already uninited. Interrupts and + * timer have already been handled in xen_cpu_dead_hvm(). */ - if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) { - xen_smp_intr_free(cpu); - xen_uninit_lock_cpu(cpu); - } + xen_uninit_lock_cpu(cpu); if (cpu_acpi_id(cpu) != U32_MAX) per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);