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 8314D146A9B; Thu, 26 Dec 2024 21:31:13 +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=1735248674; cv=none; b=Ci9gBj5nPKell6PPS/WqdUsD1OybNqph1UM1xUET+PoiZKuWYPqlyMnYa/EBWL1bmueh7jPHZwc6S5rEREm4eD6oqa32dLEnOZXhCXQur0iHnOQZHopjPOo1aOVXdW0yjvtR7wUpMaSML1t/scWbIp1vJ1axjKsDTuB2iAD6xAY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735248674; c=relaxed/simple; bh=sR3Ef6BwCvtBM3nr55FMPN7FB8Oam8zRJ+m1vTQbmok=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=lxvofwF/FKc20gZNtwo93WMoyACMIGweFAlHdNUC0HqHvQLz+wnNtdkPEOPQydZ6uahlmLObMAtowa8HGIMkFZKIB/tXnv1bFaTyptXdujmfRj7RTStvRUXpkS9LgXZMD0U1P78JN736qNsV+M5aAewxag+Bmp4isOvFRHE2pYU= 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=XCj3NBgo; 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="XCj3NBgo" Received: from romank-3650.corp.microsoft.com (unknown [131.107.160.188]) by linux.microsoft.com (Postfix) with ESMTPSA id ECBDD203EC28; Thu, 26 Dec 2024 13:31:12 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com ECBDD203EC28 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1735248673; bh=F720DUCpejtJaA15Ay8bwdRJWpUJ3EJ3rEv0YprqleM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XCj3NBgo8u5x0wO08EzPjCzwnfnCNKrwIQxwPcyAO8egkWpa3E1rfZG5RMWbNQSgr g4ayJOZtfXzqSP3zFamEowbqz2mR1796i7hvOn4eOl1/3CWcrXISIFJa/aCziXYdPC utq2m5tur4Op1O5WT0Fp4U06Ylpwu4pvj2wh7kj0= From: Roman Kisel To: hpa@zytor.com, kys@microsoft.com, bp@alien8.de, dave.hansen@linux.intel.com, decui@microsoft.com, eahariha@linux.microsoft.com, haiyangz@microsoft.com, mingo@redhat.com, mhklinux@outlook.com, nunodasneves@linux.microsoft.com, tglx@linutronix.de, tiala@microsoft.com, wei.liu@kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org Cc: apais@microsoft.com, benhill@microsoft.com, ssengar@microsoft.com, sunilmut@microsoft.com, vdso@hexbites.dev Subject: [PATCH v3 4/5] hyperv: Do not overlap the hvcall IO areas in get_vtl() Date: Thu, 26 Dec 2024 13:31:09 -0800 Message-Id: <20241226213110.899497-5-romank@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241226213110.899497-1-romank@linux.microsoft.com> References: <20241226213110.899497-1-romank@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Top-Level Functional Specification for Hyper-V, Section 3.6 [1, 2], disallows overlapping of the input and output hypercall areas, and get_vtl(void) does overlap them. Use the output hypercall page of the current vCPU for the hypercall. [1] https://learn.microsoft.com/en-us/virtualization/hyper-v-on-windows/tlfs/hypercall-interface [2] https://github.com/MicrosoftDocs/Virtualization-Documentation/tree/main/tlfs Fixes: 8387ce06d70b ("x86/hyperv: Set Virtual Trust Level in VMBus init message") Signed-off-by: Roman Kisel --- arch/x86/hyperv/hv_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index ba469d6b8250..cf3f7d30fcdd 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -422,7 +422,7 @@ static u8 __init get_vtl(void) local_irq_save(flags); input = *this_cpu_ptr(hyperv_pcpu_input_arg); - output = (struct hv_output_get_vp_registers *)input; + output = *this_cpu_ptr(hyperv_pcpu_output_arg); memset(input, 0, struct_size(input, names, 1)); input->partition_id = HV_PARTITION_ID_SELF; -- 2.34.1