From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 47F066FA1 for ; Mon, 3 Apr 2023 14:50:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1818C433D2; Mon, 3 Apr 2023 14:50:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680533441; bh=nmz204XOkJG9uXQyQt9rWF57A+xCM4lATLzlpPjVCZA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KCau1Wi/L3NgxTAjNyP0nzA1S7fxbKn/PVCwhyMIKMEAWGc4Dw4Svylr0zPO/hExE 3rtCObAkLyujfH6b9s27UgBRIdkfWtwx+pyAuaYgGmiLsbUC+JxdemiCI5NI42i/vW hDsM5yS+Bjz12oss6Od4EdkWtADNbZRJ002etH7s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Haren Myneni , Nathan Lynch , Michael Ellerman Subject: [PATCH 6.2 155/187] powerpc/pseries/vas: Ignore VAS update for DLPAR if copy/paste is not enabled Date: Mon, 3 Apr 2023 16:10:00 +0200 Message-Id: <20230403140421.184646624@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140416.015323160@linuxfoundation.org> References: <20230403140416.015323160@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Haren Myneni commit eca9f6e6f83b6725b84e1c76fdde19b003cff0eb upstream. The hypervisor supports user-mode NX from Power10. pseries_vas_dlpar_cpu() is called from lparcfg_write() to update VAS windows for DLPAR event in shared processor mode and the kernel gets -ENOTSUPP for HCALLs if the user-mode NX is not supported. The current VAS implementation also supports only with Radix page tables. Whereas in dedicated processor mode, pseries_vas_notifier() is registered only if the copy/paste feature is enabled. So instead of displaying HCALL error messages, update VAS capabilities if the copy/paste feature is available. This patch ignores updating VAS capabilities in pseries_vas_dlpar_cpu() and returns success if the copy/paste feature is not enabled. Then lparcfg_write() completes the processor DLPAR operations without any failures. Fixes: 2147783d6bf0 ("powerpc/pseries: Use lparcfg to reconfig VAS windows for DLPAR CPU") Cc: stable@vger.kernel.org # v6.1+ Signed-off-by: Haren Myneni Reviewed-by: Nathan Lynch Signed-off-by: Michael Ellerman Link: https://msgid.link/1d0e727e7dbd9a28627ef08ca9df9c86a50175e2.camel@linux.ibm.com Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/platforms/pseries/vas.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/arch/powerpc/platforms/pseries/vas.c +++ b/arch/powerpc/platforms/pseries/vas.c @@ -857,6 +857,13 @@ int pseries_vas_dlpar_cpu(void) { int new_nr_creds, rc; + /* + * NX-GZIP is not enabled. Nothing to do for DLPAR event + */ + if (!copypaste_feat) + return 0; + + rc = h_query_vas_capabilities(H_QUERY_VAS_CAPABILITIES, vascaps[VAS_GZIP_DEF_FEAT_TYPE].feat, (u64)virt_to_phys(&hv_cop_caps)); @@ -1013,6 +1020,7 @@ static int __init pseries_vas_init(void) * Linux supports user space COPY/PASTE only with Radix */ if (!radix_enabled()) { + copypaste_feat = false; pr_err("API is supported only with radix page tables\n"); return -ENOTSUPP; }