From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 518B32580F2; Tue, 11 Aug 2026 01:53:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786413182; cv=none; b=Xsxs6iYrQDKNpomTSpQLb0y7PSzjHAuRtcsLE0VdAa3yl2EURVJ06qhPQhNJcBo9nqSO1Gn6qEdvLNzAmZij9AQcc+542XPrr0IcTJNxgBZibdQjhCanDtIiDBXWcSRjPpKH9Ln16jF7HSmJJY/wUvVSL11jzl6nN7MI81sPT50= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786413182; c=relaxed/simple; bh=z5KSzQQztbLFUsJjUyfDCuhUxbkHoDL2C0yRGoAy1ko=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=agcAZn/DJNd/C4H+sLSK2n5Q0ufYHFZIRiH5evfCXVV12jG6t3lGzAWrAg0LtS8dNNaG3rjfLAsLmLJ4rdAHQbRVtcUaJ+qL5IW/FOnawI6K7smnBoDsyXEkr6DWX63IBueMrEdRjy6DS0w/bsSPbylVUFgdBuww6Eyp/dNnCdY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=pfmFUfLC; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="pfmFUfLC" Received: from fedora (unknown [20.191.74.188]) by linux.microsoft.com (Postfix) with ESMTPSA id AA0B220B7168; Mon, 10 Aug 2026 18:52:36 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com AA0B220B7168 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1786413156; bh=rDc3QKOVYWs5lYCY9tzJ9FOVXximpBXicuIVrwI13E8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pfmFUfLCZ9E+tnFOWKH20Cs81dLF1xjnUY1rGLg8F2sbw/4OtaSUQ/dD33T5NtQe+ Bhkx0ngAr26avqXkhIdm60pgWumLYFrbEsbBax6+EAFlQhuPWNxuDyOuTKFUOlpnb1 tznjgKCegIcCDS7kRugCsgCrQkOn2pm9ukLRBqcs= From: Sriram Nambakam To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 1/8] KVM: x86: raise the default maximum planes to two Date: Mon, 10 Aug 2026 18:52:36 -0700 Message-ID: <20260811015243.188486-2-snambakam@linux.microsoft.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260811015243.188486-1-snambakam@linux.microsoft.com> References: <20260811015243.188486-1-snambakam@linux.microsoft.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The default max-planes callback returns 1, which limits KVM_CAP_PLANES to a single plane on VMX (and on SVM for non-SEV-SNP guests). VBS needs a normal plane (0) and one secure plane (1), so return 2 by default. This is still gated by irqchip=split in kvm_arch_max_planes(). --- arch/x86/kvm/x86.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 35fbe0776a3e..29766c19c289 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -478,7 +478,8 @@ static unsigned int num_msr_based_features; unsigned kvm_x86_default_max_planes(struct kvm *kvm) { - return 1; + /* Support a normal plane (0) and one secure plane (1) for VBS. */ + return 2; } EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_x86_default_max_planes); -- 2.55.0