From patchwork Tue Feb 11 17:48:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 11376119 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9370814E3 for ; Tue, 11 Feb 2020 17:50:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 70B292173E for ; Tue, 11 Feb 2020 17:50:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581443401; bh=bI6+KvbUvFrGlgGnlrCjM3mn28sscwzLqPwrQi1awEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Zia4iV+SQVgtsExU8X0S8NgpLu7jnChkT2Bvbh8RvDvaqboCOPiGkpojIJ010ffOn Usdw3qO35gB4YwxnzK0y+Ek3qV1Cd+wiTDan1Bpu/+JrZTvSUT/qGiXUiaATSf7Yks QOrFBIhoTTms9Z3VP4p4cyR2I1yESZpOYW9J67ic= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730110AbgBKRuA (ORCPT ); Tue, 11 Feb 2020 12:50:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:52302 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730022AbgBKRuA (ORCPT ); Tue, 11 Feb 2020 12:50:00 -0500 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 826C6215A4; Tue, 11 Feb 2020 17:49:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581443399; bh=bI6+KvbUvFrGlgGnlrCjM3mn28sscwzLqPwrQi1awEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JMFBpTCAoy0/00GkWXbvRlICovlus2ePDvw0fFtGO0RN7GYqNKzIu6FpMeFNv3Sd2 7AJuosKm8C2cYcbRObAlfffWpFaFkNmzQymDD4SH6T6aIIguGXwmoDrf8KVrv6Z0Sd N8TbCCBpOkxqe2nZzH3wHKvR/dVTW9DZJIj/vE4o= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1j1ZfZ-004O7k-Qx; Tue, 11 Feb 2020 17:49:57 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Andre Przywara , Christoffer Dall , Dave Martin , Jintack Lim , Alexandru Elisei , James Morse , Julien Thierry , Suzuki K Poulose Subject: [PATCH v2 07/94] KVM: arm64: nv: Reset VMPIDR_EL2 and VPIDR_EL2 to sane values Date: Tue, 11 Feb 2020 17:48:11 +0000 Message-Id: <20200211174938.27809-8-maz@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200211174938.27809-1-maz@kernel.org> References: <20200211174938.27809-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, andre.przywara@arm.com, christoffer.dall@arm.com, Dave.Martin@arm.com, jintack@cs.columbia.edu, alexandru.elisei@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The VMPIDR_EL2 and VPIDR_EL2 are architecturally UNKNOWN at reset, but let's be nice to a guest hypervisor behaving foolishly and reset these to something reasonable anyway. Signed-off-by: Christoffer Dall Signed-off-by: Marc Zyngier --- arch/arm64/kvm/sys_regs.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index b00a4aeb2a2e..4b5310ea3bf8 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -624,7 +624,7 @@ static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) vcpu_write_sys_reg(vcpu, amair, AMAIR_EL1); } -static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +static u64 compute_reset_mpidr(struct kvm_vcpu *vcpu) { u64 mpidr; @@ -638,7 +638,24 @@ static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0); mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1); mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2); - vcpu_write_sys_reg(vcpu, (1ULL << 31) | mpidr, MPIDR_EL1); + mpidr |= (1ULL << 31); + + return mpidr; +} + +static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + vcpu_write_sys_reg(vcpu, compute_reset_mpidr(vcpu), MPIDR_EL1); +} + +static void reset_vmpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + vcpu_write_sys_reg(vcpu, compute_reset_mpidr(vcpu), VMPIDR_EL2); +} + +static void reset_vpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + vcpu_write_sys_reg(vcpu, read_cpuid_id(), VPIDR_EL2); } static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) @@ -1672,8 +1689,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { */ { SYS_DESC(SYS_PMCCFILTR_EL0), access_pmu_evtyper, reset_val, PMCCFILTR_EL0, 0 }, - { SYS_DESC(SYS_VPIDR_EL2), access_rw, reset_val, VPIDR_EL2, 0 }, - { SYS_DESC(SYS_VMPIDR_EL2), access_rw, reset_val, VMPIDR_EL2, 0 }, + { SYS_DESC(SYS_VPIDR_EL2), access_rw, reset_vpidr, VPIDR_EL2 }, + { SYS_DESC(SYS_VMPIDR_EL2), access_rw, reset_vmpidr, VMPIDR_EL2 }, { SYS_DESC(SYS_SCTLR_EL2), access_rw, reset_val, SCTLR_EL2, 0 }, { SYS_DESC(SYS_ACTLR_EL2), access_rw, reset_val, ACTLR_EL2, 0 },