From nobody Fri Dec 19 04:53:46 2025 Received: from mail-ej1-f74.google.com (mail-ej1-f74.google.com [209.85.218.74]) (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 838D41FD783 for ; Wed, 18 Dec 2024 19:41:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734550883; cv=none; b=jmG+ZaHp4WnC+3ctD5357+mplPb6oMipuIRetzbYvlMU0P/ocgkENuDR5OWEBgXH1Txo9Q9VwbLDrfcy4geFr6dnP5ruJvA/9Ug+GRWZqaVhq6re+UHACs+TQrr64OugMFivhkDLF1hX3g2tn4YPc9NQCjrlpxtaNNIiJbUKGGM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734550883; c=relaxed/simple; bh=pTKSZGfKbHMfdbY9ycSSpCBR5mIPbTPmtiVO7h+ymp4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=HqudMHKy/i5ciNukUzlkRTG5SB30KKaS1OnxcFHIygCjRThbcpH8jAqktFI2kZubHJOPQjs8VvsugtZuiuoPM9WM6o6+sPnr3eQyTJ4xqyTa6sTfq/vRKAqeJAboI9bwRjF37SlJpRhpE+WAie8dUStvrpcMalXYx8u9FxwQCe4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--qperret.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=LNpAld74; arc=none smtp.client-ip=209.85.218.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--qperret.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="LNpAld74" Received: by mail-ej1-f74.google.com with SMTP id a640c23a62f3a-aab954d1116so506063066b.3 for ; Wed, 18 Dec 2024 11:41:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1734550880; x=1735155680; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=BiT706MC/v/5WfOS1GqIiRFWN/xkPeYitBY7QIGoTso=; b=LNpAld74E4mmM+mCseZhykns9wsTE4T7CqHW/vkLzp8ejxW7eoKDgXzYYkSuHvJVEx JC1TB8reEpGA34NQbZY9XwC7FLC3burJx/WV1HFu8bAo4PcxwzB6PYkSCqIava+ZGHLu 1i8dx8e5Fo8wamwv/SlfGZrunU8qbpAk3ad1ewZRqTaBUHn+J+e5Kg7dn/R9hcCRERJ/ ZBtZJ30DLfRpKHbU4V2PXgW2jwhAtEkZDEJjWggGrI2b/0laI++DNnz81VESs5dNw4c/ 4f3TyFDBRFSB7Ct9a3dTYaZhmHLwv9o+SEY5KwnMsnM1gZz6DBM/ZI3pfDvZHkup2X6U KaaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734550880; x=1735155680; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=BiT706MC/v/5WfOS1GqIiRFWN/xkPeYitBY7QIGoTso=; b=PV+d5eSj59uXznxQOEOWlLQhkpz9DaKbmhyGHSWTAtDE32mjybc1R6BIKCSPwsC90W KQCMhr6ysC/dIZGCNRxdOnhfwoDWntHFeQCpEyqZRmefI3zQ8RiuGNisIo0pQzoBAgjS Anvy1+m23wpTm0AUECQtPkEmMxg8c11Ut0fypjaZgwNWSxPSHv+jORvlNpReyTC1UocR K5gCxun0e5p/uAG1+BtQCVqxxUIZeVjClaDf9627fCswXLyeMuxlr9ZLxdzI6LUwWVjO e+aUwkDUFsekQpPERJ9/OJyXQMr8NBElj+a5Ek273oMB0/DIxEp8PQU2IDvfm9Sr05oC dtbg== X-Forwarded-Encrypted: i=1; AJvYcCW8C7d73F6IlBdg0kv1rjzPy6HeDIaY+WHN780A4K3BK9uQQpTYqXYt8nLpztvVADQBS+ak7bsdD2Kyc1Y=@vger.kernel.org X-Gm-Message-State: AOJu0Yy1/WXcDjTv5l2hkQUvH49maxjt3kwJhxdTiralKHMaEcKekwAI w/WQlkX4EUuvMuelnf4LYeV9C1MK+aM3XY2e9jJ6ZgeS1MiO+IQTcxjEzWn3Sh3JN5PdPCYOMQA 8r1isfQ== X-Google-Smtp-Source: AGHT+IFWzxNIIarybqKCC1vLUo+KqgKX+4fV6W/RAvufSsLnQ/TfrAjnGZxwfp1b7qx032X10zEJNqov2L7r X-Received: from ejctz5.prod.google.com ([2002:a17:907:c785:b0:aab:9ac0:2adc]) (user=qperret job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:7ba2:b0:aab:76bd:5f8e with SMTP id a640c23a62f3a-aac07b905fdmr61154666b.53.1734550880082; Wed, 18 Dec 2024 11:41:20 -0800 (PST) Date: Wed, 18 Dec 2024 19:40:49 +0000 In-Reply-To: <20241218194059.3670226-1-qperret@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241218194059.3670226-1-qperret@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241218194059.3670226-9-qperret@google.com> Subject: [PATCH v4 08/18] KVM: arm64: Add {get,put}_pkvm_hyp_vm() helpers From: Quentin Perret To: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon Cc: Fuad Tabba , Vincent Donnefort , Sebastian Ene , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In preparation for accessing pkvm_hyp_vm structures at EL2 in a context where we can't always expect a vCPU to be loaded (e.g. MMU notifiers), introduce get/put helpers to get temporary references to hyp VMs from any context. Tested-by: Fuad Tabba Reviewed-by: Fuad Tabba Signed-off-by: Quentin Perret --- arch/arm64/kvm/hyp/include/nvhe/pkvm.h | 3 +++ arch/arm64/kvm/hyp/nvhe/pkvm.c | 20 ++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h b/arch/arm64/kvm/hyp/in= clude/nvhe/pkvm.h index 24a9a8330d19..f361d8b91930 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h +++ b/arch/arm64/kvm/hyp/include/nvhe/pkvm.h @@ -70,4 +70,7 @@ struct pkvm_hyp_vcpu *pkvm_load_hyp_vcpu(pkvm_handle_t ha= ndle, unsigned int vcpu_idx); void pkvm_put_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu); =20 +struct pkvm_hyp_vm *get_pkvm_hyp_vm(pkvm_handle_t handle); +void put_pkvm_hyp_vm(struct pkvm_hyp_vm *hyp_vm); + #endif /* __ARM64_KVM_NVHE_PKVM_H__ */ diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c index 071993c16de8..d46a02e24e4a 100644 --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -327,6 +327,26 @@ void pkvm_put_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu) hyp_spin_unlock(&vm_table_lock); } =20 +struct pkvm_hyp_vm *get_pkvm_hyp_vm(pkvm_handle_t handle) +{ + struct pkvm_hyp_vm *hyp_vm; + + hyp_spin_lock(&vm_table_lock); + hyp_vm =3D get_vm_by_handle(handle); + if (hyp_vm) + hyp_page_ref_inc(hyp_virt_to_page(hyp_vm)); + hyp_spin_unlock(&vm_table_lock); + + return hyp_vm; +} + +void put_pkvm_hyp_vm(struct pkvm_hyp_vm *hyp_vm) +{ + hyp_spin_lock(&vm_table_lock); + hyp_page_ref_dec(hyp_virt_to_page(hyp_vm)); + hyp_spin_unlock(&vm_table_lock); +} + static void pkvm_init_features_from_host(struct pkvm_hyp_vm *hyp_vm, const= struct kvm *host_kvm) { struct kvm *kvm =3D &hyp_vm->kvm; --=20 2.47.1.613.gc27f4b7a9f-goog