From patchwork Thu Feb 17 18:40:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 12750556 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 705DCC433F5 for ; Thu, 17 Feb 2022 18:41:44 +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=u592eUBu6i0ubuqUr4C3zgwOdBYxexuk4cYPPRb8Fpw=; b=HricjZuExPkhc0 rVqgyYA5fvmM5XzPVr6cgFWmM5x40tvWPVSwMlcU68sCybtS4qYDTfU0xG5TWT8GCsWq1+EgoyB2v nJxbAgm1iSektUUe3mmMnTIfo1Q+4Tpia+j6vikU1VLXbvV7q5MjwdkYhmzCxSLwV3nq5X2hnrfcw vDXAdGfSuIzjd/rO4bHTchvPGPv6yt7HgMST0jKNrR07o45op84QjhZ9c+otgvM1Mk0/UcAjZqzqk kJH21y7m4x0A/59n4MRlUJCqieECXsxU/s++L6w2ZenMZcRnV9OHxPPPG4B52ecGFKLf5UmvTzxo1 VUIFKDf5bTI1oa3/11lA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nKlhg-00BlCg-VN; Thu, 17 Feb 2022 18:40:33 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nKlhN-00BlAs-RF for linux-arm-kernel@lists.infradead.org; Thu, 17 Feb 2022 18:40:15 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4D2DF61B8F; Thu, 17 Feb 2022 18:40:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4F6C3C340EC; Thu, 17 Feb 2022 18:40:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645123212; bh=AvpDsTJy33MMXHL+fb3Mjorlmhx4c1Iz104Hh8djs+k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZHJmbBUH+Du9K4eelGWklUpeIaMN0DUEnODhCluhEvmQQ8zQsMe6r6DJvN6k0QGd1 YyT+aU2TEZ4racjn+QGfERZcT+uteJZH5XVD3J3uOKiY3HSuKa6+HJRjHLGMJ5iEo8 QYc7F4uYfoFaVy2v84Oo0iVrydL0DpImYO1FDESQD7HqXmSe780/ArpBFq3lbbwBZc V1wRi14343rNB1p1bwm2Ah0EPGUBDmu7CoSAprl84PZPaLLohf/crTHP1MuOj0I0Km jeqOX3rBUzkSChEw9L+rFlgPiG1Kx7raDztNK/x/lMZ1fduTJsd71iUYnmlYH9YuPz 5Hc+CN/ghDH5w== From: Will Deacon To: kvmarm@lists.cs.columbia.edu Cc: linux-arm-kernel@lists.infradead.org, Will Deacon , Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose Subject: [PATCH 2/3] KVM: arm64: Expose PSCI SYSTEM_RESET2 call to the guest Date: Thu, 17 Feb 2022 18:40:00 +0000 Message-Id: <20220217184001.11753-3-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220217184001.11753-1-will@kernel.org> References: <20220217184001.11753-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220217_104013_981468_E44E5C51 X-CRM114-Status: GOOD ( 16.71 ) 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 PSCI v1.1 introduces the optional SYSTEM_RESET2 call, which allows the caller to provide a vendor-specific "reset type" to request a particular form of reset or shutdown. Expose this call to the guest and handle it in the same way as PSCI SYSTEM_RESET, along with some basic range checking on the argument. Cc: Marc Zyngier Cc: James Morse Cc: Alexandru Elisei Cc: Suzuki K Poulose Signed-off-by: Will Deacon --- arch/arm64/kvm/psci.c | 33 +++++++++++++++++++++++++++++---- include/uapi/linux/psci.h | 4 ++++ 2 files changed, 33 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c index 70d07477e712..30fcc5a99483 100644 --- a/arch/arm64/kvm/psci.c +++ b/arch/arm64/kvm/psci.c @@ -308,7 +308,7 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu) static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor) { u32 psci_fn = smccc_get_function(vcpu); - u32 feature; + u32 arg; unsigned long val; int ret = 1; @@ -320,12 +320,12 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor) val = minor == 0 ? KVM_ARM_PSCI_1_0 : KVM_ARM_PSCI_1_1; break; case PSCI_1_0_FN_PSCI_FEATURES: - feature = smccc_get_arg1(vcpu); - val = kvm_psci_check_allowed_function(vcpu, feature); + arg = smccc_get_arg1(vcpu); + val = kvm_psci_check_allowed_function(vcpu, arg); if (val) break; - switch(feature) { + switch(arg) { case PSCI_0_2_FN_PSCI_VERSION: case PSCI_0_2_FN_CPU_SUSPEND: case PSCI_0_2_FN64_CPU_SUSPEND: @@ -341,11 +341,36 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor) case ARM_SMCCC_VERSION_FUNC_ID: val = 0; break; + case PSCI_1_1_FN_SYSTEM_RESET2: + case PSCI_1_1_FN64_SYSTEM_RESET2: + if (minor >= 1) { + val = 0; + break; + } + fallthrough; default: val = PSCI_RET_NOT_SUPPORTED; break; } break; + case PSCI_1_1_FN_SYSTEM_RESET2: + kvm_psci_narrow_to_32bit(vcpu); + fallthrough; + case PSCI_1_1_FN64_SYSTEM_RESET2: + if (minor >= 1) { + arg = smccc_get_arg1(vcpu); + + if (arg > PSCI_1_1_RESET_TYPE_SYSTEM_WARM_RESET && + arg < PSCI_1_1_RESET_TYPE_VENDOR_START) { + val = PSCI_RET_INVALID_PARAMS; + } else { + kvm_psci_system_reset(vcpu); + val = PSCI_RET_INTERNAL_FAILURE; + ret = 0; + } + break; + }; + fallthrough; default: return kvm_psci_0_2_call(vcpu); } diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h index 2fcad1dd0b0e..2bf93c0d6354 100644 --- a/include/uapi/linux/psci.h +++ b/include/uapi/linux/psci.h @@ -82,6 +82,10 @@ #define PSCI_0_2_TOS_UP_NO_MIGRATE 1 #define PSCI_0_2_TOS_MP 2 +/* PSCI v1.1 reset type encoding for SYSTEM_RESET2 */ +#define PSCI_1_1_RESET_TYPE_SYSTEM_WARM_RESET 0 +#define PSCI_1_1_RESET_TYPE_VENDOR_START 0x80000000U + /* PSCI version decoding (independent of PSCI version) */ #define PSCI_VERSION_MAJOR_SHIFT 16 #define PSCI_VERSION_MINOR_MASK \