Message ID | 1509101470-7881-25-git-send-email-Dave.Martin@arm.com |
---|---|
State | New |
Headers | show
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Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by merlin.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1e82Ff-0005EW-5r for linux-arm-kernel@lists.infradead.org; Fri, 27 Oct 2017 10:52:36 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7BFB71A3B; Fri, 27 Oct 2017 03:52:06 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id C12023F24A; Fri, 27 Oct 2017 03:52:04 -0700 (PDT) From: Dave Martin <Dave.Martin@arm.com> To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 24/28] arm64/sve: KVM: Hide SVE from CPU features exposed to guests Date: Fri, 27 Oct 2017 11:51:06 +0100 Message-Id: <1509101470-7881-25-git-send-email-Dave.Martin@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1509101470-7881-1-git-send-email-Dave.Martin@arm.com> References: <1509101470-7881-1-git-send-email-Dave.Martin@arm.com> MIME-Version: 1.0 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -6.9 (------) X-Spam-Report: SpamAssassin version 3.4.1 on merlin.infradead.org summary: Content analysis details: (-6.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [217.140.101.70 listed in list.dnswl.org] -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-arm-kernel>, <mailto:linux-arm-kernel-request@lists.infradead.org?subject=unsubscribe> List-Archive: <http://lists.infradead.org/pipermail/linux-arm-kernel/> List-Post: <mailto:linux-arm-kernel@lists.infradead.org> List-Help: <mailto:linux-arm-kernel-request@lists.infradead.org?subject=help> List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-arm-kernel>, <mailto:linux-arm-kernel-request@lists.infradead.org?subject=subscribe> Cc: linux-arch@vger.kernel.org, Okamoto Takayuki <tokamoto@jp.fujitsu.com>, libc-alpha@sourceware.org, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Szabolcs Nagy <szabolcs.nagy@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, =?utf-8?q?Alex_Benn=C3=A9e?= <alex.bennee@linaro.org>, kvmarm@lists.cs.columbia.edu Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org> Errors-To: linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org List-Id: linux-imx-kernel.lists.patchwork.ozlabs.org |
Series |
ARM Scalable Vector Extension (SVE)
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expand
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diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index b1f7552..a0ee9b0 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -23,6 +23,7 @@ #include <linux/bsearch.h> #include <linux/kvm_host.h> #include <linux/mm.h> +#include <linux/printk.h> #include <linux/uaccess.h> #include <asm/cacheflush.h> @@ -897,8 +898,17 @@ static u64 read_id_reg(struct sys_reg_desc const *r, bool raz) { u32 id = sys_reg((u32)r->Op0, (u32)r->Op1, (u32)r->CRn, (u32)r->CRm, (u32)r->Op2); + u64 val = raz ? 0 : read_sanitised_ftr_reg(id); - return raz ? 0 : read_sanitised_ftr_reg(id); + if (id == SYS_ID_AA64PFR0_EL1) { + if (val & (0xfUL << ID_AA64PFR0_SVE_SHIFT)) + pr_err_once("kvm [%i]: SVE unsupported for guests, suppressing\n", + task_pid_nr(current)); + + val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT); + } + + return val; } /* cpufeature ID register access trap handlers */