From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Martin Subject: [PATCH 22/27] arm64/sve: KVM: Treat guest SVE use as undefined instruction execution Date: Wed, 9 Aug 2017 13:05:28 +0100 Message-ID: <1502280338-23002-23-git-send-email-Dave.Martin@arm.com> References: <1502280338-23002-1-git-send-email-Dave.Martin@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A98B749C65 for ; Wed, 9 Aug 2017 08:06:50 -0400 (EDT) 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 r9hdUKoKTTjZ for ; Wed, 9 Aug 2017 08:06:49 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by mm01.cs.columbia.edu (Postfix) with ESMTP id B14E049C5A for ; Wed, 9 Aug 2017 08:06:49 -0400 (EDT) In-Reply-To: <1502280338-23002-1-git-send-email-Dave.Martin@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: linux-arm-kernel@lists.infradead.org Cc: linux-arch@vger.kernel.org, libc-alpha@sourceware.org, Ard Biesheuvel , Szabolcs Nagy , Catalin Marinas , Will Deacon , Marc Zyngier , Richard Sandiford , kvmarm@lists.cs.columbia.edu List-Id: kvmarm@lists.cs.columbia.edu When trapping forbidden attempts by a guest to use SVE, we want the guest to see a trap consistent with SVE not being implemented. This patch injects an undefined instruction exception into the guest in response to such an exception. Signed-off-by: Dave Martin --- arch/arm64/kvm/handle_exit.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 17d8a16..e3e42d0 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -147,6 +147,13 @@ static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run) return 1; } +static int handle_sve(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + /* Until SVE is supported for guests: */ + kvm_inject_undefined(vcpu); + return 1; +} + static exit_handle_fn arm_exit_handlers[] = { [0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec, [ESR_ELx_EC_WFx] = kvm_handle_wfx, @@ -160,6 +167,7 @@ static exit_handle_fn arm_exit_handlers[] = { [ESR_ELx_EC_HVC64] = handle_hvc, [ESR_ELx_EC_SMC64] = handle_smc, [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg, + [ESR_ELx_EC_SVE] = handle_sve, [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort, [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort, [ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug, -- 2.1.4