From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 852BACD8C92 for ; Mon, 8 Jun 2026 14:43:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ZXkKp8kG/0fBtRwaWAbF0jNtBmsWhh4RZxVGzd1B2tE=; b=xzJOwtHmd8qb1c j0U5DbD8iXBvbZZKSbelZ0aul8iZzi+qCUtnOI1y2PRCbdcQANWySL19K76VKl6Div5njJOEbIizy 4EhBz/NirJn6hfMo7rjAX/P1ECeBszvHfkGMbek1YgpJbCxiQpfN8wdeOxGsVlTStZXgDjMis/ltd PVd3RqpoU8+bhnRjCDzeK9CUA7GoEgKrkamvzz4+PKYmcFUTgfcwByAFjF9CYqBsAYcEprnJk1hqz YYpjDIdU0sslvPsmwnOLhktHUlagV2jq3LX3G0D19f1pHJmOdBdFjcX3MwxhAqadE+tKH9b6BMER7 9LIKEWzUmbgWFi0zlfYA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wWbCE-00000003pnV-27V7; Mon, 08 Jun 2026 14:43:22 +0000 Received: from mail.8bytes.org ([2a01:238:42d9:3f00:e505:6202:4f0c:f051]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wWbC7-00000003pTc-2aN0 for kvm-riscv@lists.infradead.org; Mon, 08 Jun 2026 14:43:18 +0000 Received: from io.home.8bytes.org (p4ffe1d30.dip0.t-ipconnect.de [79.254.29.48]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mail.8bytes.org (Postfix) with ESMTPSA id 15AC22028BF; Mon, 8 Jun 2026 16:43:11 +0200 (CEST) From: =?UTF-8?q?J=C3=B6rg=20R=C3=B6del?= To: Paolo Bonzini , Sean Christopherson Cc: Tom Lendacky , ashish.kalra@amd.com, michael.roth@amd.com, nsaenz@amazon.com, anelkz@amazon.de, James.Bottomley@HansenPartnership.com, Melody Wang , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, x86@kernel.org, coconut-svsm@lists.linux.dev, joerg.roedel@amd.com Subject: [PATCH 28/60] kvm: Implement KVM_CAP_PLANES Date: Mon, 8 Jun 2026 16:42:20 +0200 Message-ID: <20260608144252.351443-29-joro@8bytes.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260608144252.351443-1-joro@8bytes.org> References: <20260608144252.351443-1-joro@8bytes.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260608_074315_850372_25632061 X-CRM114-Status: GOOD ( 10.85 ) X-BeenThere: kvm-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org From: Paolo Bonzini Introduce an architecture call-back to request the VM-specific maximum number of supported planes. Use that to implement the KVM_CAP_PLANES capability check. Signed-off-by: Paolo Bonzini Co-developed-by: Joerg Roedel Signed-off-by: Joerg Roedel --- arch/arm64/kvm/arm.c | 5 +++++ arch/loongarch/kvm/vm.c | 5 +++++ arch/mips/kvm/mips.c | 5 +++++ arch/powerpc/kvm/powerpc.c | 5 +++++ arch/riscv/kvm/main.c | 5 +++++ arch/s390/kvm/kvm-s390.c | 5 +++++ arch/x86/kvm/x86.c | 5 +++++ include/linux/kvm_host.h | 2 ++ virt/kvm/kvm_main.c | 4 ++++ 9 files changed, 41 insertions(+) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 1e2f42134b74..7e6d2773fd39 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -200,6 +200,11 @@ static int kvm_arm_default_max_vcpus(void) return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS; } +unsigned kvm_arch_max_planes(struct kvm *kvm) +{ + return 1; +} + /** * kvm_arch_init_vm - initializes a VM data structure * @kvm: pointer to the KVM struct diff --git a/arch/loongarch/kvm/vm.c b/arch/loongarch/kvm/vm.c index 1317c718f896..14f1232c6e0c 100644 --- a/arch/loongarch/kvm/vm.c +++ b/arch/loongarch/kvm/vm.c @@ -109,6 +109,11 @@ void kvm_arch_destroy_vm(struct kvm *kvm) kvm->arch.phyid_map = NULL; } +unsigned kvm_arch_max_planes(struct kvm *kvm) +{ + return 1; +} + int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) { int r; diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 776aba0af096..60870452119d 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -115,6 +115,11 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) return !!(vcpu->arch.pending_exceptions); } +unsigned kvm_arch_max_planes(struct kvm *kvm) +{ + return 1; +} + bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) { return false; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 5d94e0f676ec..cfa40be20e00 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -499,6 +499,11 @@ void kvm_arch_destroy_vm(struct kvm *kvm) module_put(kvm->arch.kvm_ops->owner); } +unsigned kvm_arch_max_planes(struct kvm *kvm) +{ + return 1; +} + int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) { int r; diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c index cb8a65273c1f..5adba3a455a3 100644 --- a/arch/riscv/kvm/main.c +++ b/arch/riscv/kvm/main.c @@ -17,6 +17,11 @@ DEFINE_STATIC_KEY_FALSE(kvm_riscv_vsstage_tlb_no_gpa); +unsigned kvm_arch_max_planes(struct kvm *kvm) +{ + return 1; +} + static void kvm_riscv_setup_vendor_features(void) { /* Andes AX66: split two-stage TLBs */ diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index e6fe83da172f..24f24ea95f86 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -3186,6 +3186,11 @@ static void sca_dispose(struct kvm *kvm) kvm->arch.sca = NULL; } +unsigned kvm_arch_max_planes(struct kvm *kvm) +{ + return 1; +} + void kvm_arch_free_vm(struct kvm *kvm) { if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 50601ac2828f..25299c8c28e3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -482,6 +482,11 @@ static u32 msr_based_features[ARRAY_SIZE(msr_based_features_all_except_vmx) + (KVM_LAST_EMULATED_VMX_MSR - KVM_FIRST_EMULATED_VMX_MSR + 1)]; static unsigned int num_msr_based_features; +unsigned kvm_arch_max_planes(struct kvm *kvm) +{ + return 1; +} + /* * All feature MSRs except uCode revID, which tracks the currently loaded uCode * patch, are immutable once the vCPU model is defined. diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 291bccce9b74..3ecd472c7cfa 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1156,6 +1156,8 @@ void kvm_unlock_all_vcpus(struct kvm *kvm); void vcpu_load(struct kvm_vcpu *vcpu); void vcpu_put(struct kvm_vcpu *vcpu); +unsigned kvm_arch_max_planes(struct kvm *kvm); + #ifdef CONFIG_KVM_IOAPIC void kvm_arch_post_irq_ack_notifier_list_update(struct kvm *kvm); #else diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7a0b632e3ac0..5a0277e2ac7c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5079,6 +5079,10 @@ static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) case KVM_CAP_GUEST_MEMFD_FLAGS: return kvm_gmem_get_supported_flags(kvm); #endif + case KVM_CAP_PLANES: + if (kvm) + return kvm_arch_max_planes(kvm); + return 1; default: break; } -- 2.53.0 -- kvm-riscv mailing list kvm-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kvm-riscv