From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (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 855E721C160 for ; Fri, 17 Oct 2025 00:32:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760661175; cv=none; b=pYm9eu6EVyGYfWmgrVl0RVSV+dfYkbM6LX0nYBkXbaio+ZNsjQTrNktZTOARSAHi0ppROKcLFt8JKcPspm/mK3qSLRSFzT2qL+kLF7UBB6xODRRwXAsFhZA0+rtBnnSHaUS1NVbsNaji8Xm5LFXRjxIJ4oZXaaHfaodLE0R8Egg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760661175; c=relaxed/simple; bh=Z5xAV/JEgL1zrSHNWBCq2Gg3U16HqziHPgrjQtnPeVA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=JDsgKAAliqBUCeWnr2hS8sjOAk7UBevttQfjxsE+xnjt7FNAchA4GXTSI1YUOFESCuGdNrOVvMdlmkzl9+og3Ws9gnhf2QIG0toas+1s2/PqWiKGErDMRxk0nRFW/MI3C7O2Xz6mEc7TakkR08n80P6/iz9L/JZJ5QtK4j1lbUM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=jKm50r45; arc=none smtp.client-ip=209.85.216.74 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--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jKm50r45" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-33428befc5bso1885769a91.0 for ; Thu, 16 Oct 2025 17:32:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1760661172; x=1761265972; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=33cozUgZY2qVcRUHL7b8tITs99/x6FMYwOKO1Eer8GQ=; b=jKm50r45dDeqZwuqs2ZAfE9BApXpVKATtOxyLMRaGTWi8osTveoa3Tof6kfb577Ejc EVMmZiJXQQWFn4PKznlOA8MT7eFqrrXyoxLOXRdpChYbaixxmats9uIiZj4SA4vw7jzL Na3Kk9c8XDMg8ndPApiIHD6xKVYoO2ZkOQDxd/t1PVC3GbyXZpWDXJKfvJgznO/3DySk 4iqaCT6v5sNsjI+LoHcl+NXiaIREEZMZUNdOzzpq9sUaiJwHvnOwe5uuN7VXYccaJ++S zoEcSu13No9zV6knM7Ca6xOT9DzLlBroHwbNh7AqXkl2HRdZMgvuh2ZFqeklLXSO/X/s 2cvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760661172; x=1761265972; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=33cozUgZY2qVcRUHL7b8tITs99/x6FMYwOKO1Eer8GQ=; b=A5AtjU8TBK8U1Bs/J1Fa98gX4uqnPCXtz41nK/aPIGy1nv1xNopMV8xUkiAlS5JVE5 k4fs71XUGFNQ0p1Ejbmnh/PRsptp3Z7M0YzMujCORH9t9ynJyXzPaKbDYCsCukLQpxWA zNOPPCEJeR2lMNdkH5ToXltjM9N+uVop6d+UnPCbgsjpkdAKt3Af59b7spx000YzWDwa FhFmPO0Cd33X+uFk3trFBuA3p5ye/e7rBxtqpVxlUpMwd77M4koIoAmSfsmhgcb2Jtf1 PzxSgw3r5scpQvj0irTCf8yFOhKTh3jrpvB85ii5AmW1Ukmg1E0Mp+/LYW9R3q1x4Tg1 lmdw== X-Forwarded-Encrypted: i=1; AJvYcCWGEKZJlP8nmxW4cGtf6n3Z/wx9SdyWxnJhdtGmVytpKZWPxrxxC7LXc7LnSPujbgAKtWMeaxLxSpg=@lists.linux.dev X-Gm-Message-State: AOJu0YybyKvqfFPOBTCrTV/x/40P0D7qiv0Xr21zOstENii04JKNF2fW 9CalfOar+sAUo9s1+7rGgKQwyRrGG9qs+1ABaZFy4st8oGq1Im9aRdnKaLD6Hp/oqd/s0NoK+7K St6NcOQ== X-Google-Smtp-Source: AGHT+IHi1bmDhBVE/1dfVFfxtUsGZvUIPpndhcsCAkXUuWnb62NCix+r2iPcIxi5145AtUHJ60DhAmmul/g= X-Received: from pjut11.prod.google.com ([2002:a17:90a:d50b:b0:33b:beb0:be7]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:380f:b0:32e:8931:b59c with SMTP id 98e67ed59e1d1-33bcf90c0cdmr1921084a91.27.1760661171886; Thu, 16 Oct 2025 17:32:51 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 16 Oct 2025 17:32:20 -0700 In-Reply-To: <20251017003244.186495-1-seanjc@google.com> Precedence: bulk X-Mailing-List: loongarch@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251017003244.186495-1-seanjc@google.com> X-Mailer: git-send-email 2.51.0.858.gf9c4a03a3a-goog Message-ID: <20251017003244.186495-3-seanjc@google.com> Subject: [PATCH v3 02/25] KVM: Rename kvm_arch_vcpu_async_ioctl() to kvm_arch_vcpu_unlocked_ioctl() From: Sean Christopherson To: Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Madhavan Srinivasan , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson , Paolo Bonzini , "Kirill A. Shutemov" Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, x86@kernel.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, Ira Weiny , Kai Huang , Michael Roth , Yan Zhao , Vishal Annapurve , Rick Edgecombe , Ackerley Tng , Binbin Wu Content-Type: text/plain; charset="UTF-8" Rename the "async" ioctl API to "unlocked" so that upcoming usage in x86's TDX code doesn't result in a massive misnomer. To avoid having to retry SEAMCALLs, TDX needs to acquire kvm->lock *and* all vcpu->mutex locks, and acquiring all of those locks after/inside the current vCPU's mutex is a non-starter. However, TDX also needs to acquire the vCPU's mutex and load the vCPU, i.e. the handling is very much not async to the vCPU. No functional change intended. Signed-off-by: Sean Christopherson --- arch/arm64/kvm/arm.c | 4 ++-- arch/loongarch/kvm/vcpu.c | 4 ++-- arch/mips/kvm/mips.c | 4 ++-- arch/powerpc/kvm/powerpc.c | 4 ++-- arch/riscv/kvm/vcpu.c | 4 ++-- arch/s390/kvm/kvm-s390.c | 4 ++-- arch/x86/kvm/x86.c | 4 ++-- include/linux/kvm_host.h | 4 ++-- virt/kvm/kvm_main.c | 6 +++--- 9 files changed, 19 insertions(+), 19 deletions(-) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 785aaaee6a5d..e8d654024608 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1828,8 +1828,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp, return r; } -long kvm_arch_vcpu_async_ioctl(struct file *filp, unsigned int ioctl, - unsigned long arg) +long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { return -ENOIOCTLCMD; } diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 30e3b089a596..9a5844e85fd3 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -1471,8 +1471,8 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) return 0; } -long kvm_arch_vcpu_async_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) +long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { void __user *argp = (void __user *)arg; struct kvm_vcpu *vcpu = filp->private_data; diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index a75587018f44..b0fb92fda4d4 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -895,8 +895,8 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, return r; } -long kvm_arch_vcpu_async_ioctl(struct file *filp, unsigned int ioctl, - unsigned long arg) +long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 2ba057171ebe..9a89a6d98f97 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -2028,8 +2028,8 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, return -EINVAL; } -long kvm_arch_vcpu_async_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) +long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index bccb919ca615..a4bd6077eecc 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -238,8 +238,8 @@ vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) return VM_FAULT_SIGBUS; } -long kvm_arch_vcpu_async_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) +long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 16ba04062854..8c4caa5f2fcd 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -5730,8 +5730,8 @@ static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu, return r; } -long kvm_arch_vcpu_async_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) +long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { struct kvm_vcpu *vcpu = filp->private_data; void __user *argp = (void __user *)arg; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ca5ba2caf314..b85cb213a336 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7240,8 +7240,8 @@ static int kvm_vm_ioctl_set_clock(struct kvm *kvm, void __user *argp) return 0; } -long kvm_arch_vcpu_async_ioctl(struct file *filp, unsigned int ioctl, - unsigned long arg) +long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, + unsigned long arg) { return -ENOIOCTLCMD; } diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 7186b2ae4b57..d93f75b05ae2 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1557,6 +1557,8 @@ long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg); long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg); +long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg); vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf); int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext); @@ -2437,8 +2439,6 @@ static inline bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) } #endif /* CONFIG_HAVE_KVM_NO_POLL */ -long kvm_arch_vcpu_async_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg); void kvm_arch_guest_memory_reclaimed(struct kvm *kvm); #ifdef CONFIG_HAVE_KVM_VCPU_RUN_PID_CHANGE diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index b7a0ae2a7b20..b7db1d5f71a8 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4434,10 +4434,10 @@ static long kvm_vcpu_ioctl(struct file *filp, return r; /* - * Some architectures have vcpu ioctls that are asynchronous to vcpu - * execution; mutex_lock() would break them. + * Let arch code handle select vCPU ioctls without holding vcpu->mutex, + * e.g. to support ioctls that can run asynchronous to vCPU execution. */ - r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg); + r = kvm_arch_vcpu_unlocked_ioctl(filp, ioctl, arg); if (r != -ENOIOCTLCMD) return r; -- 2.51.0.858.gf9c4a03a3a-goog