From patchwork Thu May 4 19:02:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13231655 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 28625C77B7C for ; Thu, 4 May 2023 19:09:52 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.529936.825025 (Exim 4.92) (envelope-from ) id 1pueKa-0006UF-D0; Thu, 04 May 2023 19:09:32 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 529936.825025; Thu, 04 May 2023 19:09:32 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pueKa-0006S5-2y; Thu, 04 May 2023 19:09:32 +0000 Received: by outflank-mailman (input) for mailman id 529936; Thu, 04 May 2023 19:09:30 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pueDj-00042j-BA for xen-devel@lists.xenproject.org; Thu, 04 May 2023 19:02:27 +0000 Received: from galois.linutronix.de (galois.linutronix.de [193.142.43.55]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 35d37f1b-eaae-11ed-b226-6b7b168915f2; Thu, 04 May 2023 21:02:26 +0200 (CEST) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 35d37f1b-eaae-11ed-b226-6b7b168915f2 Message-ID: <20230504185937.257347750@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1683226946; 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=7K79vzHgMUP9R0A/9c85ZFgwBToV4EA8CXJkDqIYiAA=; b=UC7UBpzkmxaEWM2nz/Qw6Vjvrnn6fWsNM/KnljWxV7HMtz5u7vnaAfODd1M7vTr5ktTb20 nVojYUScHcp2OqOxJ8IqsoIvsDu/7IdzIUdDuRTyFO8wPuGlIHpnfYJUn5p8bx3AiClEX1 fRskIOaKRFHPshjjQegmMKxWZJiKU/W1wNR+46su4jgsn/9Va0iMm7QqwA01siEqX7wCZg cW+AbT9hwgRm2RTXxGoRlf6T+Y7L4Mnn/bxe5uXiXqUdghVOxD2GUZ9J1ZZ4wpm572Kggb lAqMgDTfSLuvpAL4aW6s90BbYxngLSPUP8QvW4PAuFXJ0OZBFaKLB/9XRIX9dw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1683226946; 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=7K79vzHgMUP9R0A/9c85ZFgwBToV4EA8CXJkDqIYiAA=; b=y1BzbUsMle0wpOLNE2p2p2IO/b5quxM8T3suQns4J8s0UcXtZFuk8jCSoUG3pH8YtIQT2K ezemL9386MNKclAg== 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 , Usama Arif , Juergen Gross , Boris Ostrovsky , xen-devel@lists.xenproject.org, 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 , "Michael Kelley (LINUX)" Subject: [patch V2 17/38] x86/xen/hvm: Get rid of DEAD_FROZEN handling References: <20230504185733.126511787@linutronix.de> MIME-Version: 1.0 Date: Thu, 4 May 2023 21:02:25 +0200 (CEST) From: Thomas Gleixner 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);