From patchwork Thu Apr 24 14:13:10 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Karim Manaouil X-Patchwork-Id: 884947 Received: from mail-wr1-f43.google.com (mail-wr1-f43.google.com [209.85.221.43]) (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 DDAB31A072C for ; Thu, 24 Apr 2025 14:13:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.43 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745504032; cv=none; b=uVKL/Ms/fzrTDFqiLC4jCMci0YI2BtJJJaHnP4Az4UlDep5VoiOROiG5ailCdB8T9wEShjckBhDqSFOvtigWGDIwZeJz3nhUj9BzjP6osF3D+M+zV2TRJmAUEZHIwu9pc/4ZtaNMKRoGdXHG/Uoen2ajJYYuWK66Casa+xZ+0og= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745504032; c=relaxed/simple; bh=wzaNO/FV98NvOhVwcurDeWV9o2lzkiDEMgzO9vOQkfc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=cglXseCeQv31UJ2WRFoykt9TPoErkci5tYixzvUyoEeAtCGdLpOCyVj+nZ0x5VjMfaFaRDlVBu/xBVElq2g62LkQytILUoxwXDBEyXe8AL7qEUNjTwQ63E8OY8CIv/HefpHSbvSMoLZaVZEu7ULgK9MKVP83KG/IK0igdU+unSQ= 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=AJZId15e; arc=none smtp.client-ip=209.85.221.43 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="AJZId15e" Received: by mail-wr1-f43.google.com with SMTP id ffacd0b85a97d-39ee651e419so653747f8f.3 for ; Thu, 24 Apr 2025 07:13:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1745504029; x=1746108829; 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=9Hk5UBQTvuxPsQW0619Tu3I4qsqkftwTtmBE5Ybb85g=; b=AJZId15e7pdgeqWr+FMAv4lLCiYL8lS9X4n246zeYuB5IaR/DGRrpcovPDeJif1ult pCCP+lQCy1PBuRRsue4enbNhuItViUP50zrTPxmT0nYVJuKw/mn8cCZ5OQlhg6eDHW9M a05wR8Ubv3dLoceKbyhzZ/riusaGcx+r9eKtqhXZP/YlnDIR6V5OqRyMhOR7PXfzMpu9 bd39oniRh5fAZXnOSJ6Smcyyg/jnOY7Ep8YHqXr5Ac8Lg6Ki8jPdYS6b+DDfyDjPiHA+ KmVtSGfJ5KzOQuk2U26Ugg9Q5sqD/HC/WlFq2brgPR9T1soyDON1tKSxraJ1r6NZZ3nr p44Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1745504029; x=1746108829; 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=9Hk5UBQTvuxPsQW0619Tu3I4qsqkftwTtmBE5Ybb85g=; b=FSNkpKcZ2ZmCvc7zZbEU7Y3or8RvC+1htiCWVY9os/pZh54Oc79di3xdaqQXHvupLw SPxobCF5h+tZs8r+u2odC8e0pH2+jbbbwJdLI5QeJW2THXo5ACQlaemblGuXUSpSHpNf ixxYpanvfTtodXOjD7BGABW90RZI1CRm562oUFog8+on26+5y+dUJad17ouGf8RhcOXw UeGulNe8HIi+VVe/vYdY3yjxPZER7a/0U8jj9LzIwwk1htpW3i7Ob/1Vv4jrjgylGgM8 BjVcS41YV5OckD3t/K7DrqxNDDqvxtdpBZ0muQ525rDGwd5Y9aGJfDaFIaEG7wJPTbJC LS5g== X-Forwarded-Encrypted: i=1; AJvYcCXbO+myVrXNQZ9hLpseTm/EOgkl4DeBEBL90h8vj/93JWk2BsC/hyo2zYZVZnwWWWUrsPIG3a7Rlj0s9cMB@vger.kernel.org X-Gm-Message-State: AOJu0YwpZO/xy7wC+IhUIwAJNI+h2KVb1oaQpeXQbGIxw37W6xFvo8nw 0eSWCbUnUK414vT+RorsUtaFPhrinN4Eph3kyxxdg+rkIWaJ/GYASHxcvmVSj7E= X-Gm-Gg: ASbGncuHLmQyj/DOZnBOIIG839AC8yi1hXuq+QE1/Ld1KxNPn3zusyajcrORWYM7+xS DUNPQzipdSX5LqqwHz/J2aQdaVEnu6gyKVmJnA65SqKcYtNoBb7c0Utt6m1muozNSdAVwklMZYe RAlTwMsqjSOVlA0Pv8st3pihxSrQ4Ms8xcXf7AdpmtTNF9KsGIXUHDJS6toFAVZh2IuPni4oRSh CTtZx1EkRsX8bpvC72nzZu+ZO3mZuXMCuTa1Pfmf++7mrh14xj/Qs1NdTDC2HCIN7rC6p37QO98 K24LlgXMcPy/1DLkLZ+QytGtt0DNEVe/J4myTxVXAnJrs+TmgdwIwIjCYaq8knfGcTQW6BerNYe ekPnPFrISU5f/sZz8BHl8YfhZEAY= X-Google-Smtp-Source: AGHT+IEX65fw+AuwIbm8DfCqVPIwMLBPu7X4mEmOAObvmlxgMqJT5rSe8ZZGCXBt4CgJFkEQIJbeNw== X-Received: by 2002:a05:6000:1a85:b0:391:39fb:59c8 with SMTP id ffacd0b85a97d-3a06cf61418mr2487543f8f.25.1745504029007; Thu, 24 Apr 2025 07:13:49 -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.7.2025.04.24.07.13.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Apr 2025 07:13:48 -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 Subject: [RFC PATCH 03/34] KVM: irqfd: Allow KVM backends to override IRQ injection via set_irq callback Date: Thu, 24 Apr 2025 15:13:10 +0100 Message-Id: <20250424141341.841734-4-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-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Some KVM backends, such as Gunyah, require custom mechanisms to inject interrupts into the guest. For example, Gunyah performs IRQ injection through a hypercall to the underlying hypervisor. To support such use case, this patch introduces a new optional callback field `set_irq` in `struct kvm_kernel_irqfd`. If this callback is set, irqfd injection will use the provided function instead of calling kvm_set_irq() directly. The default behavior is unchanged for existing users that do not override the `set_irq` field. Signed-off-by: Karim Manaouil --- include/linux/kvm_irqfd.h | 1 + virt/kvm/eventfd.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/include/linux/kvm_irqfd.h b/include/linux/kvm_irqfd.h index e8d21d443c58..7d54bc12c4bf 100644 --- a/include/linux/kvm_irqfd.h +++ b/include/linux/kvm_irqfd.h @@ -46,6 +46,7 @@ struct kvm_kernel_irqfd { /* Used for level IRQ fast-path */ int gsi; struct work_struct inject; + int (*set_irq)(struct kvm_kernel_irqfd *); /* The resampler used by this irqfd (resampler-only) */ struct kvm_kernel_irqfd_resampler *resampler; /* Eventfd notified on resample (resampler-only) */ diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 5f3776a1b960..d6702225e7f2 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -63,6 +63,11 @@ irqfd_inject(struct work_struct *work) container_of(work, struct kvm_kernel_irqfd, inject); struct kvm *kvm = irqfd->kvm; + if (irqfd->set_irq) { + irqfd->set_irq(irqfd); + return; + } + if (!irqfd->resampler) { kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1, false);