From nobody Mon Feb 9 10:27:06 2026 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 C0D2C314D2C; Tue, 23 Dec 2025 01:22:57 +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=1766452977; cv=none; b=GQw6f86fNSSntVSzwiITA3gLTRjF8A1fmTFWt4BDpVgH1v1sRg4UudqhGHA8h316JzB0nPhsYWN8m/pXAr+GzaRGDy8rZtXc6wPnkhe+DIM8k6cE4DlG0Y7Qlsz6H8I/Nvz48kB4l71B2nfyb2U2i++DVU/mmXlc1LyW7fsDj7s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766452977; c=relaxed/simple; bh=QalGDOMHjOiQjvBbbedaaYeF4HQ2DEwgjsr/uOC9S0E=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=H5qaiRi7PBIplg6otOZvpUYn02uKyNaCvnhbBH6yknDcSF5rsMIx4PJHTRiOntfSVusIYB1ZAPmggKcPD0kn7nlokHmBZ1XlvRBej0pQwEp5FM5YzhgN5ttfZ3qvHLVhpvgXWpv9GPwNTvGtjaDYea8cGZ7RB8xnl5bxdmtHplc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DZraqkfX; 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="DZraqkfX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F451C19422; Tue, 23 Dec 2025 01:22:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766452977; bh=QalGDOMHjOiQjvBbbedaaYeF4HQ2DEwgjsr/uOC9S0E=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=DZraqkfX93bL3Xevfi+qsnXNb9OcIWXRZQqAiD/HWbASFR2KJ7RdKD1rEv7n7MbM1 VQaiOHb+FuPb2T/w8k0YpWl1k0JSjS+jIv7aPB0q0msMJ3/uEwTG1fCHrKViOkXZ3w PwgG97CyAeYu9nxQjl6JuX6xjRH4n4qLAVvp+duMIaUe/3QQ0nW4ICDp7iBtJocvFF lhQxOM96DR/WzMJ49v1HYaqDuuZFE8hLF+NuEyxowNv1tG8D6zppzXmyZsUMKL2ysz MCkgjGZuzUMIvqVx0ikJ1gUxPFcGAPu9JhKsl/8mKULjtNs8dpS1wXUvsIZpBanlwK Vt/tO9EKzucgg== From: Mark Brown Date: Tue, 23 Dec 2025 01:21:13 +0000 Subject: [PATCH v9 19/30] KVM: arm64: Provide assembly for SME register access Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251223-kvm-arm64-sme-v9-19-8be3867cb883@kernel.org> References: <20251223-kvm-arm64-sme-v9-0-8be3867cb883@kernel.org> In-Reply-To: <20251223-kvm-arm64-sme-v9-0-8be3867cb883@kernel.org> To: Marc Zyngier , Joey Gouly , Catalin Marinas , Suzuki K Poulose , Will Deacon , Paolo Bonzini , Jonathan Corbet , Shuah Khan , Oliver Upton Cc: Dave Martin , Fuad Tabba , Mark Rutland , Ben Horgan , 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, Peter Maydell , Eric Auger , Mark Brown X-Mailer: b4 0.15-dev-47773 X-Developer-Signature: v=1; a=openpgp-sha256; l=1851; i=broonie@kernel.org; h=from:subject:message-id; bh=QalGDOMHjOiQjvBbbedaaYeF4HQ2DEwgjsr/uOC9S0E=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBpSe6Rm6UAk60DHDfEFq1PtHTHsczXqVLJt7lIW mXsBgcMvg2JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCaUnukQAKCRAk1otyXVSH 0IcHB/42RHGmQOW7bcb0Ca/kXpI+DpixoJ3o82LwO+zziSgSoIRMBGxX2S3DE8strN3QI33ylPX HvYQ0PrSI7IyZa9DMk2bIQzKIOKyg2tDb9maQm6iPGySwTUIKxmMM4Io3f8cY7+mz/KAL+5NnfL o+XpSaXuu9W1cqk10ObSgPh+ohdHbOkP2Sl10iVeEITpcgUEDtmeW9aBkeUSAccNqbyrBRSHSGk MjvN4/GST/Ef9J/mFebLrus44Zo6fFqTIgURWE8DwoMiogYmpMjGAOlaMLEYI/E3PUTjXxl1XC0 jZphq6h63+BpNT4S0/vSe2f4sYCVmZimpIx8Q709gUoNRcWs X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Provide versions of the SME state save and restore functions 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 | 3 +++ arch/arm64/kvm/hyp/fpsimd.S | 26 ++++++++++++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_= hyp.h index 0317790dd3b7..1cef9991d238 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -116,6 +116,9 @@ void __fpsimd_save_state(struct user_fpsimd_state *fp_r= egs); 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_save_state(void const *state, bool restore_zt); +void __sme_restore_state(void const *state, bool restore_zt); =20 u64 __guest_enter(struct kvm_vcpu *vcpu); =20 diff --git a/arch/arm64/kvm/hyp/fpsimd.S b/arch/arm64/kvm/hyp/fpsimd.S index 6e16cbfc5df2..44a1b0a483da 100644 --- a/arch/arm64/kvm/hyp/fpsimd.S +++ b/arch/arm64/kvm/hyp/fpsimd.S @@ -29,3 +29,29 @@ 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_save_state) + _sme_rdsvl 2, 1 // x2 =3D VL/8 + sme_save_za 0, x2, 12 // Leaves x0 pointing to the end of ZA + + cbz x1, 1f + _str_zt 0 +1: + ret +SYM_FUNC_END(__sme_save_state) + +SYM_FUNC_START(__sme_restore_state) + _sme_rdsvl 2, 1 // x2 =3D 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) --=20 2.47.3