From nobody Thu Dec 18 08:11:10 2025 Received: from mail-wm1-f45.google.com (mail-wm1-f45.google.com [209.85.128.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1A14B288C94 for ; Thu, 24 Apr 2025 14:14:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745504055; cv=none; b=WJXIUbJXA7DP1GKi99gmu+eJUKXAXWzgY5H3DpTrgdT3EaUfw2Wv2ACSnZ3vqRm92YauSoiZ+G5QTnh+FLMGOwCWKi/UF/ek3WQlYP2FfhikCWXY82VzydOFW/+IFhVCOb+MuE74m21S/wd0U599GdfkzXnxIjrd4BHUBBdzhrY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745504055; c=relaxed/simple; bh=2aIlJTxyajv9w1JNq2QUWNBaFE1l1Iz4MgPOHzkWSHs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=UtciNqWdDn0WGwoRbdsS9O6BssjVZDaiD2XIxtULcr6SjM9/kVSx7oPpLoZfPgYCHPiEhDOox5lRBnr52hzTCZZcYv0uvMYYdgSec3pqvKhkHECpjqvRRMNWmk3LRV2WetLIkyyoFscYyPfBGnWkkz366jOuyX5XtrS/JaxAh6E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=PJZRrhye; arc=none smtp.client-ip=209.85.128.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="PJZRrhye" Received: by mail-wm1-f45.google.com with SMTP id 5b1f17b1804b1-43cfba466b2so10630655e9.3 for ; Thu, 24 Apr 2025 07:14:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1745504051; x=1746108851; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=mnnNrRFux5qVcGjuNFA0c9YQRdgVNUximYQurTlnUC4=; b=PJZRrhyeB9kFuh5fnr6Nbxc6hBWs4a64QdPEFmN6EjippJ8/wFu+CIKUVczzDUBqh3 afTa0zEhR+philf+002ackoL6VTNxbBgqwzH3tecbFIHxuzwa93EtCfPNNnTilwq7gm6 Q5ZOQ52nyt5CUsXzxFumP4ORZN0zxiWGoAx1odVSisLG4VW79iVky/ct8IuYjx3ziW0A NB1P3pxFsx/voIgr8Fn9gjhRZAk+/21vaiehhkayNW42Fqk6NyJaexztNuffnx+/BqOc qigxJdZ2AUmPsYD6qeYmRUQhvRWkn8h0xx33NFpO8sBwTFvmDtZI0e4/CPbM9C+izJzZ xVlQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1745504051; x=1746108851; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=mnnNrRFux5qVcGjuNFA0c9YQRdgVNUximYQurTlnUC4=; b=sf9jFgb/MTL4uNJj/2JM5XtbRhStzNjhL0ZuNup++p7t3T4HSAiiZGUTUdTOxUaT7b 9ZRSL7kpRNEc9CQsh+8oCabq7MqFzp9U5ysP9MR1ewQUU87jquGgB9ZvTe5Oj+I3VH/y S2GcwMlGHt2vjg7OsUtiy7Kr7rRrE/j3zEBi5/1GkQdNArpqTTNp7VAd5hrHlafRf+fi 811KMFwwO6KAxtwvVCkrHowbrL4npiX8G6B9hfjnETo2Kc1hHnFy7OSqFRZ5haczvMQx 2EZnfEvfrGBDv9yB70g7LFIyfQ7nTSEoxiID2+tMuRgU7Qq8G/3bkMzxqw57Ym0UIGXc DFcA== X-Gm-Message-State: AOJu0YwLyLwbnva7TZUf5dypX0HA1it+5/l2gGqoe52Q5PPI1nqoghVY mSCtGcUb1IUrinjp4222rt4o1gxaIu+r9KC0haRJJLQ7dP26PnlNhDen46GQzDqrxDIV9pYdOR1 T X-Gm-Gg: ASbGnctH9gMEQbN36Tzi3IW3O2aaYPSez51np6opSis2LzG0ky/+g8sjKr7/WA3i6q1 uIyfNmFwy0LeJHzhYb9JuFsXJjxDdEREvI+ZwcF6cGDaySxPyeVRLeYBL31yrF3POMZ92p0EP74 fIGZAPFuyCUPF7GMqYI22BqMEdHLRX9nXvj6ANmwm6nXAIqXPv33vs7PCjJa5+CYomNOSYx5tkm BfrLuX0Z2JR0tQZry2zKDGhaCt3C+dJCwHBakVyHruVYd9IArVqkpNM6VlQ+z3xuos07Eph6ire iz6A25K44CheiECrJ6f7rvQP7aFqW9AweG26yO1Q3MB/lV+mzxye9LhS0pDjpjlehWDeihi5bPF MPRGnKPLiPAjLh7g2 X-Google-Smtp-Source: AGHT+IElBFJDMQbW748Xhn6uR3Gy7UiwZwfaHD4iyiwy3AqrKyTZYkKWwIgzmc9HZX/EcWP9CEo9Lw== X-Received: by 2002:a05:6000:18a2:b0:391:47d8:de2d with SMTP id ffacd0b85a97d-3a06cf5ed4cmr2483522f8f.23.1745504050693; Thu, 24 Apr 2025 07:14:10 -0700 (PDT) Received: from seksu.systems-nuts.com (stevens.inf.ed.ac.uk. [129.215.164.122]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a06d4a8150sm2199951f8f.7.2025.04.24.07.14.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Apr 2025 07:14:10 -0700 (PDT) From: Karim Manaouil To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Cc: Karim Manaouil , Alexander Graf , Alex Elder , Catalin Marinas , Fuad Tabba , Joey Gouly , Jonathan Corbet , Marc Zyngier , Mark Brown , Mark Rutland , Oliver Upton , Paolo Bonzini , Prakruthi Deepak Heragu , Quentin Perret , Rob Herring , Srinivas Kandagatla , Srivatsa Vaddagiri , Will Deacon , Haripranesh S , Carl van Schaik , Murali Nalajala , Sreenivasulu Chalamcharla , Trilok Soni , Stefan Schmidt , Elliot Berman Subject: [RFC PATCH 19/34] gunyah: Add hypercalls for running a vCPU Date: Thu, 24 Apr 2025 15:13:26 +0100 Message-Id: <20250424141341.841734-20-karim.manaouil@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250424141341.841734-1-karim.manaouil@linaro.org> References: <20250424141341.841734-1-karim.manaouil@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Elliot Berman Add hypercall to donate CPU time to a vCPU. Signed-off-by: Elliot Berman Reviewed-by: Srivatsa Vaddagiri Signed-off-by: Karim Manaouil --- arch/arm64/gunyah/gunyah_hypercall.c | 37 ++++++++++++++++++++++++++++ include/linux/gunyah.h | 35 ++++++++++++++++++++++++++ 2 files changed, 72 insertions(+) diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunya= h_hypercall.c index 1302e128be6e..fee21df42c17 100644 --- a/arch/arm64/gunyah/gunyah_hypercall.c +++ b/arch/arm64/gunyah/gunyah_hypercall.c @@ -39,6 +39,7 @@ EXPORT_SYMBOL_GPL(arch_is_gunyah_guest); #define GUNYAH_HYPERCALL_HYP_IDENTIFY GUNYAH_HYPERCALL(0x8000) #define GUNYAH_HYPERCALL_MSGQ_SEND GUNYAH_HYPERCALL(0x801B) #define GUNYAH_HYPERCALL_MSGQ_RECV GUNYAH_HYPERCALL(0x801C) +#define GUNYAH_HYPERCALL_VCPU_RUN GUNYAH_HYPERCALL(0x8065) /* clang-format on */ =20 /** @@ -113,5 +114,41 @@ enum gunyah_error gunyah_hypercall_msgq_recv(u64 capid= , void *buff, size_t size, } EXPORT_SYMBOL_GPL(gunyah_hypercall_msgq_recv); =20 +/** + * gunyah_hypercall_vcpu_run() - Donate CPU time to a vcpu + * @capid: capability ID of the vCPU to run + * @resume_data: Array of 3 state-specific resume data + * @resp: Filled reason why vCPU exited when return value is GUNYAH_ERROR_= OK + * + * See also: + * https://github.com/quic/gunyah-hypervisor/blob/develop/docs/api/gunyah_= api.md#run-a-proxy-scheduled-vcpu-thread + */ +enum gunyah_error +gunyah_hypercall_vcpu_run(u64 capid, unsigned long *resume_data, + struct gunyah_hypercall_vcpu_run_resp *resp) +{ + struct arm_smccc_1_2_regs args =3D { + .a0 =3D GUNYAH_HYPERCALL_VCPU_RUN, + .a1 =3D capid, + .a2 =3D resume_data[0], + .a3 =3D resume_data[1], + .a4 =3D resume_data[2], + /* C language says this will be implictly zero. Gunyah requires 0, so be= explicit */ + .a5 =3D 0, + }; + struct arm_smccc_1_2_regs res; + + arm_smccc_1_2_hvc(&args, &res); + if (res.a0 =3D=3D GUNYAH_ERROR_OK) { + resp->sized_state =3D res.a1; + resp->state_data[0] =3D res.a2; + resp->state_data[1] =3D res.a3; + resp->state_data[2] =3D res.a4; + } + + return res.a0; +} +EXPORT_SYMBOL_GPL(gunyah_hypercall_vcpu_run); + MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls"); diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index 573e3bbd4cb6..f86f14018734 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -219,4 +219,39 @@ enum gunyah_error gunyah_hypercall_msgq_send(u64 capid= , size_t size, void *buff, enum gunyah_error gunyah_hypercall_msgq_recv(u64 capid, void *buff, size_t= size, size_t *recv_size, bool *ready); =20 +struct gunyah_hypercall_vcpu_run_resp { + union { + enum { + /* clang-format off */ + /* VCPU is ready to run */ + GUNYAH_VCPU_STATE_READY =3D 0, + /* VCPU is sleeping until an interrupt arrives */ + GUNYAH_VCPU_STATE_EXPECTS_WAKEUP =3D 1, + /* VCPU is powered off */ + GUNYAH_VCPU_STATE_POWERED_OFF =3D 2, + /* VCPU is blocked in EL2 for unspecified reason */ + GUNYAH_VCPU_STATE_BLOCKED =3D 3, + /* VCPU has returned for MMIO READ */ + GUNYAH_VCPU_ADDRSPACE_VMMIO_READ =3D 4, + /* VCPU has returned for MMIO WRITE */ + GUNYAH_VCPU_ADDRSPACE_VMMIO_WRITE =3D 5, + /* VCPU blocked on fault where we can demand page */ + GUNYAH_VCPU_ADDRSPACE_PAGE_FAULT =3D 7, + /* clang-format on */ + } state; + u64 sized_state; + }; + u64 state_data[3]; +}; + +enum { + GUNYAH_ADDRSPACE_VMMIO_ACTION_EMULATE =3D 0, + GUNYAH_ADDRSPACE_VMMIO_ACTION_RETRY =3D 1, + GUNYAH_ADDRSPACE_VMMIO_ACTION_FAULT =3D 2, +}; + +enum gunyah_error +gunyah_hypercall_vcpu_run(u64 capid, unsigned long *resume_data, + struct gunyah_hypercall_vcpu_run_resp *resp); + #endif --=20 2.39.5