From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 659DBC43613 for ; Mon, 24 Jun 2019 13:08:16 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id D3FF42133F for ; Mon, 24 Jun 2019 13:08:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D3FF42133F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 581A84A4E6; Mon, 24 Jun 2019 09:08:15 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id h4OxTcz06Wle; Mon, 24 Jun 2019 09:08:14 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1D13F4A445; Mon, 24 Jun 2019 09:08:14 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 11AF54A2E5 for ; Mon, 24 Jun 2019 09:08:13 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id k-ufNPVj4Wpf for ; Mon, 24 Jun 2019 09:08:11 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A495B4A445 for ; Mon, 24 Jun 2019 09:08:11 -0400 (EDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4F0C4344; Mon, 24 Jun 2019 06:08:11 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EC5173F71E; Mon, 24 Jun 2019 06:08:09 -0700 (PDT) Date: Mon, 24 Jun 2019 14:08:07 +0100 From: Dave Martin To: Marc Zyngier Subject: Re: [PATCH 09/59] KVM: arm64: nv: Add nested virt VCPU primitives for vEL2 VCPU state Message-ID: <20190624130807.GS2790@e103592.cambridge.arm.com> References: <20190621093843.220980-1-marc.zyngier@arm.com> <20190621093843.220980-10-marc.zyngier@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190621093843.220980-10-marc.zyngier@arm.com> User-Agent: Mutt/1.5.23 (2014-03-12) Cc: kvm@vger.kernel.org, Andre Przywara , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Fri, Jun 21, 2019 at 10:37:53AM +0100, Marc Zyngier wrote: > From: Christoffer Dall > > When running a nested hypervisor we commonly have to figure out if > the VCPU mode is running in the context of a guest hypervisor or guest > guest, or just a normal guest. > > Add convenient primitives for this. > > Signed-off-by: Christoffer Dall > Signed-off-by: Marc Zyngier > --- > arch/arm64/include/asm/kvm_emulate.h | 55 ++++++++++++++++++++++++++++ > 1 file changed, 55 insertions(+) > > diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h > index 39ffe41855bc..8f201ea56f6e 100644 > --- a/arch/arm64/include/asm/kvm_emulate.h > +++ b/arch/arm64/include/asm/kvm_emulate.h > @@ -191,6 +191,61 @@ static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num, > vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val; > } > > +static inline bool vcpu_mode_el2_ctxt(const struct kvm_cpu_context *ctxt) > +{ > + unsigned long cpsr = ctxt->gp_regs.regs.pstate; > + u32 mode; > + > + if (cpsr & PSR_MODE32_BIT) > + return false; > + > + mode = cpsr & PSR_MODE_MASK; > + > + return mode == PSR_MODE_EL2h || mode == PSR_MODE_EL2t; We could also treat PSR_MODE32_BIT and PSR_MODE_MASK as a single field, similarly as in the next patch, say: switch (ctxt->gp_regs.regs.pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) { case PSR_MODE_EL2h: case PSR_MODE_EL2t: return true; } return false; (This is blatant bikeshedding...) [...] Cheers ---Dave _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm