From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (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 81756219E5A for ; Tue, 12 Nov 2024 19:33:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731440024; cv=none; b=GK7GfKusVTZW0YuJUy4pbM1oDzRTMgWyPFMeWWIojxThZ6QyaTy2IogdVJxEMjPGGy1UxM7DupHuolgMNFvnN58eLMm0TrSN9GzEaIvhYmbxKm3ZCD5JcTkff0oDU6MKxCUtGLmxYWU32jxeM9nkOOedrihAaC+Odwyw/0Btlr8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731440024; c=relaxed/simple; bh=6C41LX4i9cTx1gh70EBFDyV45Diih+RA+d+s5h63nro=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Zbet2ZHjzYRTG87ymdMB2msR9kVVPOWdROVUGIiJ6U8xpD/t7IoNAfHxMtaGSQ72aKkp3OUKXqQ35zmMR9WzOqLVSGbO5tkUPsWFvfs2kDN75CGGJif50WzRt8mTogt7jfm+CQ8rDIebmjeiJrO6t8UWxfVCK3Brwr8z4Y0DAvw= 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=B/JZF92Z; arc=none smtp.client-ip=209.85.128.201 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="B/JZF92Z" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-6e38fabff35so55330437b3.0 for ; Tue, 12 Nov 2024 11:33:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1731440021; x=1732044821; darn=vger.kernel.org; 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=DY8XtbI4B5jvo0O8PmvLtsCSOMCPMY0S/opKq4djRSg=; b=B/JZF92ZZ78fLYjLCjvQJA4kERsYT0lsXr5A3of2i3ShTLPBvV0/nYaEo7YeR4g2Hv rcnUiRjKvs/sPo4ao9ME5nV7P5npSEXr7STVzTX6VmHDfkG18KrmlbeFbA2L2PyYoGqy TxBDl4MLYLLu9jnL4OVUhmp1vyaJo/cAEp6AqbXgHpBqrs+/tqTYZK1jtE/obpu002Bk GiMGkrjA1FwWqx0kK640NcEgO2hN96SPkoYluC5VgZbfM5BuO3oV8KXYyN5cviSPrmrp 7OSQuhgjONrUZd+1O3w1gWHPGDioLBwbOCpFy1woQ+T92aDzO0hOKYN/Ug6ebmxdYFVn uldQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731440021; x=1732044821; 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=DY8XtbI4B5jvo0O8PmvLtsCSOMCPMY0S/opKq4djRSg=; b=tqrLJY3J2mpkbu3mHjerbA/cCpWCUY6Ht522A0QORlasoBM/OPqWJN9sKoBMi0mFUs TR/qd8HAJECFocrJDojeDq1QNQL8j/NK/mu4MmwfLRc6mzL3mnJenwprBm4741KlYTpI 16WRwg/HxoOoRa6NA7kEJRBLNx8SvkFOzNKl7iTFZ2VIm+bVQdcHCoudBSbphjKx64ly /rkZ+5nfIZpcoYeyv7n1WCoJMFO1YNbe3ZtfeSM3kjapZJbyzoEzczkQdP50kk1YBILS OG19x/7iB9xdEtUyIc88o/7BIm6vhrop7HSrQ6ZOXldSpHgwSOe4NvhzSfCLqsEKlGVD E9bg== X-Forwarded-Encrypted: i=1; AJvYcCUaoajh4/sFlEodooHEPnVLcSYpTEV/iZ+wcVcl6rCcpparSWNVUByIsjQ4mPiP3cVjloAWfy1OEKV9kBA=@vger.kernel.org X-Gm-Message-State: AOJu0Yyi9saG0jJVrtAgC2maXgwIFREm9PQv57+ex6sLxnytfKWUEu+Q YdS9KgDd+6CLg6lJgZnst0zZiOcKHVkbjVXvXybRD3NYJl/xHkczv9Q+7sTSxJUrSc/4yNmXsiu 5cg== X-Google-Smtp-Source: AGHT+IEfiBnG43gqjtPlri+V2asF4S1cpViCIopZffwXn6FSbMi2vaF5IgSBd31XWNhwa69IX48SXk7pAsA= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:9d:3983:ac13:c240]) (user=seanjc job=sendgmr) by 2002:a25:addc:0:b0:e30:cee4:1431 with SMTP id 3f1490d57ef6-e337f8465a7mr51655276.1.1731440021500; Tue, 12 Nov 2024 11:33:41 -0800 (PST) Reply-To: Sean Christopherson Date: Tue, 12 Nov 2024 11:33:31 -0800 In-Reply-To: <20241112193335.597514-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241112193335.597514-1-seanjc@google.com> X-Mailer: git-send-email 2.47.0.277.g8800431eea-goog Message-ID: <20241112193335.597514-2-seanjc@google.com> Subject: [GIT PULL] KVM: Generic changes for 6.13 From: Sean Christopherson To: Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Christopherson Content-Type: text/plain; charset="UTF-8" Please pull two changes that coincidentally happen to be related to vcpu->pid. The following changes since commit 5cb1659f412041e4780f2e8ee49b2e03728a2ba6: Merge branch 'kvm-no-struct-page' into HEAD (2024-10-25 13:38:16 -0400) are available in the Git repository at: https://github.com/kvm-x86/linux.git tags/kvm-x86-generic-6.13 for you to fetch changes up to 3e7f43188ee227bcf0f07f60a00f1fd1aca10e6a: KVM: Protect vCPU's "last run PID" with rwlock, not RCU (2024-10-30 14:41:22 -0700) ---------------------------------------------------------------- KVM generic changes for 6.13 - Rework kvm_vcpu_on_spin() to use a single for-loop instead of making two partial poasses over "all" vCPUs. Opportunistically expand the comment to better explain the motivation and logic. - Protect vcpu->pid accesses outside of vcpu->mutex with a rwlock instead of RCU, so that running a vCPU on a different task doesn't encounter long stalls due to having to wait for all CPUs become quiescent. ---------------------------------------------------------------- Sean Christopherson (3): KVM: Rework core loop of kvm_vcpu_on_spin() to use a single for-loop KVM: Return '0' directly when there's no task to yield to KVM: Protect vCPU's "last run PID" with rwlock, not RCU arch/arm64/include/asm/kvm_host.h | 2 +- include/linux/kvm_host.h | 3 +- virt/kvm/kvm_main.c | 143 ++++++++++++++++++++++---------------- 3 files changed, 86 insertions(+), 62 deletions(-)