From nobody Tue Mar 3 05:05:57 2026 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 D99913EBF0B; Mon, 2 Mar 2026 19:14:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772478891; cv=none; b=eAQyIIOPQWcO+L2hMtmtt1IvFTHUqO9EXJ2Ndf2WyjHvRfBueY3rpnehN04FrnVP72LT5PKudBHMmmR15vYxKHFzMg5t1znNDVziYT++vzyKkTqVcdobNgVkmrp770NgXpDwBVTazmpoXgbfz+NOYOSparxH/6qmNTQL8p7fdvc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772478891; c=relaxed/simple; bh=S7O9Pwkij2Awxqvl2IdvidJkvTEayDKdMv2IpZS7iJM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=g6mvYha9ZVBJbqWiSfKP555LcsWYyyVPZgnJ07h7QIZX16Z7VPIKIOgTDFPGXsn0cC5Fj7WEHK+TI2521TJPf+EJ7VCsR637WmSVNg3EB8HSMAdOqhXoJwFENC5e+Uqcin0bwjRDpIpbLpWCuYQ4CcLs5pW2vWcv6c9hz1ITtpA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=P8wneOhP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="P8wneOhP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A0C6C19423; Mon, 2 Mar 2026 19:14:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772478891; bh=S7O9Pwkij2Awxqvl2IdvidJkvTEayDKdMv2IpZS7iJM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P8wneOhP+zXAuZCvpw9yuabiGrOyLiz9dBMW4cZ+pPFFC3g1eO5um/M7eDfN8k0nX v+9kx8TjQxnexlfcSeoY1wjHgywzuHGXYhg2QXS/AD0Fgwck9mqahHVvSGoJB46smR tMPcFv/LbG0Pmo9qB7atsSoN4ZbC33yjk50fdxflRzUb8K3Ys0hrUqP52lWdt+mXWz eovC/3H7BgYN4Q4HaF3xpkmUm06jOHIdfLgBHf0UyrxinmI0rrZiUTdhyJ67pMhjV/ ph8l7g/quWv1dWl8RXx+6WFZ8T3/axHh6bF8BL3781idPvcxqNEW7zItS6SWodetB7 fbtwMIxVt19Tw== From: Tycho Andersen To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Ashish Kalra , Tom Lendacky , John Allen , Herbert Xu , "David S. Miller" , Ard Biesheuvel , Neeraj Upadhyay , Kishon Vijay Abraham I , Alexey Kardashevskiy , Nikunj A Dadhania , "Peter Zijlstra (Intel)" , Kim Phillips , Sean Christopherson Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org Subject: [PATCH 09/11] x86/snp: create snp_x86_shutdown() Date: Mon, 2 Mar 2026 12:13:32 -0700 Message-ID: <20260302191334.937981-10-tycho@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260302191334.937981-1-tycho@kernel.org> References: <20260302191334.937981-1-tycho@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: "Tycho Andersen (AMD)" After SNP_SHUTDOWN, two architecture-level things should be done: 1. clear the RMP table 2. disable MFDM to prevent the FW_WARN in k8_check_syscfg_dram_mod_en() in the event of a kexec Create and export to the CCP driver a function that does them. Signed-off-by: Tycho Andersen (AMD) Reviewed-by: Tom Lendacky --- arch/x86/include/asm/sev.h | 2 ++ arch/x86/virt/svm/sev.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index 0bcd89d4fe90..36d2b1ea19c0 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -662,6 +662,7 @@ static inline void snp_leak_pages(u64 pfn, unsigned int= pages) __snp_leak_pages(pfn, pages, true); } void snp_prepare_for_snp_init(void); +void snp_x86_shutdown(void); #else static inline bool snp_probe_rmptable_info(void) { return false; } static inline int snp_rmptable_init(void) { return -ENOSYS; } @@ -679,6 +680,7 @@ static inline void snp_leak_pages(u64 pfn, unsigned int= npages) {} static inline void kdump_sev_callback(void) { } static inline void snp_fixup_e820_tables(void) {} static inline void snp_prepare_for_snp_init(void) {} +static inline void snp_x86_shutdown(void) {} #endif =20 #endif diff --git a/arch/x86/virt/svm/sev.c b/arch/x86/virt/svm/sev.c index cf984b8f4493..0524fc77b44d 100644 --- a/arch/x86/virt/svm/sev.c +++ b/arch/x86/virt/svm/sev.c @@ -544,6 +544,13 @@ void snp_prepare_for_snp_init(void) } EXPORT_SYMBOL_FOR_MODULES(snp_prepare_for_snp_init, "ccp"); =20 +void snp_x86_shutdown(void) +{ + snp_clear_rmp(); + on_each_cpu(mfd_reconfigure, 0, 1); +} +EXPORT_SYMBOL_FOR_MODULES(snp_x86_shutdown, "ccp"); + /* * Do the necessary preparations which are verified by the firmware as * described in the SNP_INIT_EX firmware command description in the SNP --=20 2.53.0