From patchwork Thu Nov 11 16:27:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 1554043 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=RaE/Mz1+; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4HqnFn30JXz9s1l for ; Fri, 12 Nov 2021 03:28:13 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234269AbhKKQbB (ORCPT ); Thu, 11 Nov 2021 11:31:01 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:24077 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234260AbhKKQbA (ORCPT ); Thu, 11 Nov 2021 11:31:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1636648091; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DfOujgFevgbCfSH44hyzyJkrspxTIvbNw54TzLqJWDI=; b=RaE/Mz1+C05M+WWEw+suYforyGrHx19ejrCpW6u4EPzC/GdmxwIhWpF67dzd6SbeWnKHqo VE/VE9Lhrwtx/YcePrlCtJF8m7s514y56sD7UXt+0jSQzePHhZd4u+1ZQEchty4DSKogdp d2N5fr1GP7+pxDbaxhJlghRRObdOf/0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-59-9n7th--OM8ebvxxIBqNzjA-1; Thu, 11 Nov 2021 11:28:08 -0500 X-MC-Unique: 9n7th--OM8ebvxxIBqNzjA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8C00787D541; Thu, 11 Nov 2021 16:28:05 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.82]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6EA561017CF3; Thu, 11 Nov 2021 16:27:55 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Eduardo Habkost , Marc Zyngier , Andrew Jones , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Mackerras , Michael Ellerman , kvm-ppc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/5] KVM: arm64: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS Date: Thu, 11 Nov 2021 17:27:42 +0100 Message-Id: <20211111162746.100598-2-vkuznets@redhat.com> In-Reply-To: <20211111162746.100598-1-vkuznets@redhat.com> References: <20211111162746.100598-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org It doesn't make sense to return the recommended maximum number of vCPUs which exceeds the maximum possible number of vCPUs. Signed-off-by: Vitaly Kuznetsov --- arch/arm64/kvm/arm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 7838e9fb693e..391dc7a921d5 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -223,7 +223,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = 1; break; case KVM_CAP_NR_VCPUS: - r = num_online_cpus(); + if (kvm) + r = min_t(unsigned int, num_online_cpus(), + kvm->arch.max_vcpus); + else + r = min_t(unsigned int, num_online_cpus(), + kvm_arm_default_max_vcpus()); break; case KVM_CAP_MAX_VCPUS: case KVM_CAP_MAX_VCPU_ID: From patchwork Thu Nov 11 16:27:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 1554044 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=AVWDo753; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4HqnG660s3z9s1l for ; Fri, 12 Nov 2021 03:28:30 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234057AbhKKQbS (ORCPT ); Thu, 11 Nov 2021 11:31:18 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:41597 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234311AbhKKQbR (ORCPT ); Thu, 11 Nov 2021 11:31:17 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1636648107; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NmiJDhyq+drucaTkVr87beK9OfQhHewmWSpxx8X97oU=; b=AVWDo753Kf1aU/ShM1ANzT+n9u2omnsTG96ZaguaVQz+G/cUk5TmUMmt7pENRaF1tV78sL 3eBehTfNXrYeLbdqZtFnHrvxnL8Wzf6aujDCDK41aJ9Q1KGO3d18zrSSmJnsJSe0pfBFYa EVIqZ7DIu5VKfw+q58jgdAoXIiXnRNI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-542-hQfBFG5GMAaVZ8dBEiX5Ug-1; Thu, 11 Nov 2021 11:28:24 -0500 X-MC-Unique: hQfBFG5GMAaVZ8dBEiX5Ug-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6F44010144F0; Thu, 11 Nov 2021 16:28:22 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.82]) by smtp.corp.redhat.com (Postfix) with ESMTP id E27FE1017E37; Thu, 11 Nov 2021 16:28:05 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Eduardo Habkost , Marc Zyngier , Andrew Jones , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Mackerras , Michael Ellerman , kvm-ppc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/5] KVM: MIPS: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS Date: Thu, 11 Nov 2021 17:27:43 +0100 Message-Id: <20211111162746.100598-3-vkuznets@redhat.com> In-Reply-To: <20211111162746.100598-1-vkuznets@redhat.com> References: <20211111162746.100598-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org It doesn't make sense to return the recommended maximum number of vCPUs which exceeds the maximum possible number of vCPUs. Signed-off-by: Vitaly Kuznetsov --- arch/mips/kvm/mips.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 562aa878b266..aa20d074d388 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -1067,7 +1067,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = 1; break; case KVM_CAP_NR_VCPUS: - r = num_online_cpus(); + r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS); break; case KVM_CAP_MAX_VCPUS: r = KVM_MAX_VCPUS; From patchwork Thu Nov 11 16:27:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 1554046 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=iLmLZPtw; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4HqnH61rgbz9s1l for ; Fri, 12 Nov 2021 03:29:22 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234331AbhKKQcJ (ORCPT ); Thu, 11 Nov 2021 11:32:09 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:38051 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234240AbhKKQcH (ORCPT ); Thu, 11 Nov 2021 11:32:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1636648158; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=m5C/utbR+RY6tkUQ1/OF5lvFnSyvv5qyaKbzbIqaS0s=; b=iLmLZPtwfQTsxgQnSI2lPZId8MeOIAmXH19xpA15kQtfPNGfAlXlfjpehJBsE9q/Wocza1 JnK0KOzzh3C3R+uNW7I16ckTDfn4jCsXoz6ubhrc9YeicLHIAZCOqKntwyYGDzIGSL2tby w0/S9N2M2GI0fnArNb4vqbeS8JWcvGo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-375-Axrk8TiMP4G46J18ExwKZA-1; Thu, 11 Nov 2021 11:29:14 -0500 X-MC-Unique: Axrk8TiMP4G46J18ExwKZA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 143C187D558; Thu, 11 Nov 2021 16:29:12 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.82]) by smtp.corp.redhat.com (Postfix) with ESMTP id CE4FF1017E37; Thu, 11 Nov 2021 16:28:22 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Eduardo Habkost , Marc Zyngier , Andrew Jones , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Mackerras , Michael Ellerman , kvm-ppc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/5] KVM: PPC: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS Date: Thu, 11 Nov 2021 17:27:44 +0100 Message-Id: <20211111162746.100598-4-vkuznets@redhat.com> In-Reply-To: <20211111162746.100598-1-vkuznets@redhat.com> References: <20211111162746.100598-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org It doesn't make sense to return the recommended maximum number of vCPUs which exceeds the maximum possible number of vCPUs. Signed-off-by: Vitaly Kuznetsov --- arch/powerpc/kvm/powerpc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 8ab90ce8738f..ccac8d5686ff 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -641,9 +641,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) * implementations just count online CPUs. */ if (hv_enabled) - r = num_present_cpus(); + r = min_t(unsigned int, num_present_cpus(), KVM_MAX_VCPUS); else - r = num_online_cpus(); + r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS); break; case KVM_CAP_MAX_VCPUS: r = KVM_MAX_VCPUS; From patchwork Thu Nov 11 16:27:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 1554047 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=Ue9labi3; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4HqnHD5Y9hz9s1l for ; Fri, 12 Nov 2021 03:29:28 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234267AbhKKQcQ (ORCPT ); Thu, 11 Nov 2021 11:32:16 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:48651 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234312AbhKKQcQ (ORCPT ); Thu, 11 Nov 2021 11:32:16 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1636648166; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UOooTQL4J+pYhtZfN++C64GbB6JN9+KRPPDfDzsojTc=; b=Ue9labi3SYvDw05TMK+lmiJ1ZB+IY59lNUpu8Fm5QVkxRMEMIbFRnILreZkw3phWCYeOiR iKNnuP3VevDfvHFP6RtFMDbZQUSEt3HxQQ4UIZSZlK0NQBj+wVhqj/86x7qjku733KLI8i uZmp9McRMYWuYnNgczvEak5zYFIujDc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-533-S4Fi0QvnNP6kOsDg3ecJYA-1; Thu, 11 Nov 2021 11:29:23 -0500 X-MC-Unique: S4Fi0QvnNP6kOsDg3ecJYA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2C9AF814247; Thu, 11 Nov 2021 16:29:20 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.82]) by smtp.corp.redhat.com (Postfix) with ESMTP id 789A61017CE3; Thu, 11 Nov 2021 16:29:12 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Eduardo Habkost , Marc Zyngier , Andrew Jones , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Mackerras , Michael Ellerman , kvm-ppc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/5] KVM: RISC-V: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS Date: Thu, 11 Nov 2021 17:27:45 +0100 Message-Id: <20211111162746.100598-5-vkuznets@redhat.com> In-Reply-To: <20211111162746.100598-1-vkuznets@redhat.com> References: <20211111162746.100598-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org It doesn't make sense to return the recommended maximum number of vCPUs which exceeds the maximum possible number of vCPUs. Signed-off-by: Vitaly Kuznetsov --- arch/riscv/kvm/vm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c index 26399df15b63..fb18af34a4b5 100644 --- a/arch/riscv/kvm/vm.c +++ b/arch/riscv/kvm/vm.c @@ -74,7 +74,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = 1; break; case KVM_CAP_NR_VCPUS: - r = num_online_cpus(); + r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS); break; case KVM_CAP_MAX_VCPUS: r = KVM_MAX_VCPUS; From patchwork Thu Nov 11 16:27:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 1554048 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=Lus6dqkD; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4HqnHQ1yVYz9s1l for ; Fri, 12 Nov 2021 03:29:38 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234347AbhKKQcX (ORCPT ); Thu, 11 Nov 2021 11:32:23 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:58112 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234353AbhKKQcV (ORCPT ); Thu, 11 Nov 2021 11:32:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1636648172; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Fzs/tu22nSIiklxyWhqw5I8HgPrSNduRvkzTjwACmGg=; b=Lus6dqkDci3jixuzICU8ED0pM3LNo19UZhn/FW997cVdA4hU6WvqUcKjCMa1SBQIwyTSHm PLcAliD04rhx2cn6/Zy1BlF7NJU8OB4uSd882HpLWrCydvK7Yvrszj3odg0p2KTUNHE5rr /d9obasamHGQoaQwKO4eTh8zzYTi/cI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-558-OgT-AuPfP963EDRa56NUfg-1; Thu, 11 Nov 2021 11:29:28 -0500 X-MC-Unique: OgT-AuPfP963EDRa56NUfg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7590CBAFBD; Thu, 11 Nov 2021 16:29:24 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.82]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7D9DB10495BC; Thu, 11 Nov 2021 16:29:20 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Eduardo Habkost , Marc Zyngier , Andrew Jones , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Mackerras , Michael Ellerman , kvm-ppc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/5] KVM: x86: Drop arbitraty KVM_SOFT_MAX_VCPUS Date: Thu, 11 Nov 2021 17:27:46 +0100 Message-Id: <20211111162746.100598-6-vkuznets@redhat.com> In-Reply-To: <20211111162746.100598-1-vkuznets@redhat.com> References: <20211111162746.100598-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org KVM_CAP_NR_VCPUS is used to get the "recommended" maximum number of VCPUs and arm64/mips/riscv report num_online_cpus(). Powerpc reports either num_online_cpus() or num_present_cpus(), s390 has multiple constants depending on hardware features. On x86, KVM reports an arbitrary value of '710' which is supposed to be the maximum tested value but it's possible to test all KVM_MAX_VCPUS even when there are less physical CPUs available. Drop the arbitrary '710' value and return num_online_cpus() on x86 as well. The recommendation will match other architectures and will mean 'no CPU overcommit'. For reference, QEMU only queries KVM_CAP_NR_VCPUS to print a warning when the requested vCPU number exceeds it. The static limit of '710' is quite weird as smaller systems with just a few physical CPUs should certainly "recommend" less. Suggested-by: Eduardo Habkost Signed-off-by: Vitaly Kuznetsov --- arch/x86/include/asm/kvm_host.h | 1 - arch/x86/kvm/x86.c | 2 +- 2 files changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 88fce6ab4bbd..0232a00598f2 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -38,7 +38,6 @@ #define __KVM_HAVE_ARCH_VCPU_DEBUGFS #define KVM_MAX_VCPUS 1024 -#define KVM_SOFT_MAX_VCPUS 710 /* * In x86, the VCPU ID corresponds to the APIC ID, and APIC IDs diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ac83d873d65b..18a00a7c23bc 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4137,7 +4137,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = !static_call(kvm_x86_cpu_has_accelerated_tpr)(); break; case KVM_CAP_NR_VCPUS: - r = KVM_SOFT_MAX_VCPUS; + r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS); break; case KVM_CAP_MAX_VCPUS: r = KVM_MAX_VCPUS;