From patchwork Fri Dec 20 16:46:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 852614 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1D4F4229124; Fri, 20 Dec 2024 16:52:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734713533; cv=none; b=i+IXQp+PrIzf5+LGaRNb0i6ifRY1B7XivmT3cOorjZ+8cphh9a8Md6hy89A8oGGp98jEp5ocWVgv9fI4+wJarPH07DipAO1WeHasYxiaSAxoKbfQaTHgpWxCJ3TB3AqEveoQPWSwFEXEQ8EYXI7Gg9JLKvrRwy/uSaqof36poTs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734713533; c=relaxed/simple; bh=ENOuC1TJcLemryiEjkWj2obhMQPzOqxnrV0P2mql+Ks=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=kc3oX1L4VRcdJjTnwc7p+yxcmzpejXGkhcziA8kXk8ocilo5ey0tJV8KyJFOEH0sVy85cZLqi/8UKSdLUu/W2rAtgpQ673mlIXdi6c69nfhRqA3YbKMOA5Zad7J39pkSKf2UHZ2c75JHW2JdjKJJcTu37OmCucyTSKIs9d9pVL0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ssi8EUnV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ssi8EUnV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A3D48C4CED7; Fri, 20 Dec 2024 16:52:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734713533; bh=ENOuC1TJcLemryiEjkWj2obhMQPzOqxnrV0P2mql+Ks=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ssi8EUnVVNwfhRrHMmu+SM0Q4NnT9gMhK3MqiAI8pA6M0bBsb959zketSgp2K4CN5 JlpNGd3mV8s19GLNEdJ0aEOxoR/MILHM6yw4kfFVMnCkgoIbKEgdUlkM4Ifwp6IdEm D3DW05Lwv9eapii3FYvUq84+RhtvBtmubKLBZoH1hYLZjI14TVC9BoNcfMYY2ng8Ae B6zIJL1JjJ1in59kolXbEgkojFnZZhH4Eih9/LGrLfA3CdV5pciy0hR0RX/7FBMASt YvWyq5ejgR4+RXyjYBys+gtLXfY8uW+wrm3etNfKMUzak/AT4qVMfvL7jaqXSxGGKD eA2epJRg+O6Hg== From: Mark Brown Date: Fri, 20 Dec 2024 16:46:45 +0000 Subject: [PATCH RFC v3 20/27] KVM: arm64: Provide assembly for SME state restore Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241220-kvm-arm64-sme-v3-20-05b018c1ffeb@kernel.org> References: <20241220-kvm-arm64-sme-v3-0-05b018c1ffeb@kernel.org> In-Reply-To: <20241220-kvm-arm64-sme-v3-0-05b018c1ffeb@kernel.org> To: Marc Zyngier , Oliver Upton , Joey Gouly , Catalin Marinas , Suzuki K Poulose , Will Deacon , Paolo Bonzini , Jonathan Corbet , Shuah Khan Cc: Dave Martin , Fuad Tabba , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-1b0d6 X-Developer-Signature: v=1; a=openpgp-sha256; l=1651; i=broonie@kernel.org; h=from:subject:message-id; bh=ENOuC1TJcLemryiEjkWj2obhMQPzOqxnrV0P2mql+Ks=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBnZaBk3E6dm3e3qW64VbwkZ8BsgUXtHAv6JoenG6H9 ivnP0ZWJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZ2WgZAAKCRAk1otyXVSH0BkOB/ 9pZK/XWcKBxIAbq8Kxz8iIvhPYuh/k36bbRLFCMarZ1Z5rPMkf8dntgyNKiUgIzPm6Uw+3qRbKIe5E Bm2brl/HNycaJBXjRtj5afSTrMoQDsvGkVtIs0I8duEJFnqCf43+XJ0apduhKJ6oaPiDBTJDnOcZTe ULQT9t7Hwlzm4FsjQuXTcdNoOnXcjEnlG8ng440HTikYzJLhmd6F5lBW/Ivx99Ke5XlM+MRrm3k9VZ ot6KxSdKkSj8wIFQr80TkHle48IdnsMkMSd2EBdOrTcrop+pK8XvZWc6CR5iq8aZcEi165we8JzTAp 5tBTTH/jNzQnZA5FYD5EIyS0Nhtz5x X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Provide a __sme_restore_state() for the hypervisor to allow it to restore ZA and ZT for guests. Signed-off-by: Mark Brown --- arch/arm64/include/asm/kvm_hyp.h | 2 ++ arch/arm64/kvm/hyp/fpsimd.S | 16 ++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h index 21943cb98542750a1b626a8de6bbc095d7770ccf..5a1f8e4be18624efa6b887f09c36f0e8ad318c40 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -113,6 +113,8 @@ void __fpsimd_save_state(struct user_fpsimd_state *fp_regs); void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs); void __sve_save_state(void *sve_pffr, u32 *fpsr, int save_ffr); void __sve_restore_state(void *sve_pffr, u32 *fpsr, int restore_ffr); +int __sve_get_vl(void); +void __sme_restore_state(void const *state, bool restore_zt); u64 __guest_enter(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/hyp/fpsimd.S b/arch/arm64/kvm/hyp/fpsimd.S index e950875e31cee4df58d041519b7584356463c91b..9e4bce86ef2e632a6071480c06a0b7d69bf48f3d 100644 --- a/arch/arm64/kvm/hyp/fpsimd.S +++ b/arch/arm64/kvm/hyp/fpsimd.S @@ -31,3 +31,19 @@ SYM_FUNC_START(__sve_save_state) sve_save 0, x1, x2, 3 ret SYM_FUNC_END(__sve_save_state) + +SYM_FUNC_START(__sve_get_vl) + _sve_rdvl 0, 1 + ret +SYM_FUNC_END(__sve_get_vl) + +SYM_FUNC_START(__sme_restore_state) + _sme_rdsvl 2, 1 // x2 = VL/8 + sme_load_za 0, x2, 12 // Leaves x0 pointing to end of ZA + + cbz x1, 1f + _ldr_zt 0 + +1: + ret +SYM_FUNC_END(__sme_restore_state)