Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Received-SPF: None (esa5.hc3370-68.iphmx.com: no sender
  authenticity information available from domain of
  andrew.cooper3@citrix.com) identity=pra;
  client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com;
  envelope-from="Andrew.Cooper3@citrix.com";
  x-sender="andrew.cooper3@citrix.com";
  x-conformance=sidf_compatible
Received-SPF: Pass (esa5.hc3370-68.iphmx.com: domain of
  Andrew.Cooper3@citrix.com designates 162.221.158.21 as
  permitted sender) identity=mailfrom;
  client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com;
  envelope-from="Andrew.Cooper3@citrix.com";
  x-sender="Andrew.Cooper3@citrix.com";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133
  ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4
  ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88
  ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83
  ip4:168.245.78.127 ~all"
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  authenticity information available from domain of
  postmaster@mail.citrix.com) identity=helo;
  client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com;
  envelope-from="Andrew.Cooper3@citrix.com";
  x-sender="postmaster@mail.citrix.com";
  x-conformance=sidf_compatible
IronPort-SDR: 71h5pEqfTCR8dWxE+4xORG+x0kfkUdLgEXlbcI2+7/823J6hAcpKl1Fw0FbpM57MBZK+yPCYfe
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 Y+w=
Subject: Re: [Xen-devel] [PATCH 1/3] arm/arm64/xen: use C inlines for
 privcmd_call
To:     Julien Grall <julien@xen.org>,
        Pavel Tatashin <pasha.tatashin@soleen.com>,
        <jmorris@namei.org>, <sashal@kernel.org>,
        <linux-kernel@vger.kernel.org>, <catalin.marinas@arm.com>,
        <will@kernel.org>, <steve.capper@arm.com>,
        <linux-arm-kernel@lists.infradead.org>, <marc.zyngier@arm.com>,
        <james.morse@arm.com>, <vladimir.murzin@arm.com>,
        <mark.rutland@arm.com>, <tglx@linutronix.de>,
        <gregkh@linuxfoundation.org>, <allison@lohutok.net>,
        <info@metux.net>, <alexios.zavras@intel.com>,
        <sstabellini@kernel.org>, <boris.ostrovsky@oracle.com>,
        <jgross@suse.com>, <stefan@agner.ch>,
        <yamada.masahiro@socionext.com>, <xen-devel@lists.xenproject.org>,
        <linux@armlinux.org.uk>
References: <20191127184453.229321-1-pasha.tatashin@soleen.com>
 <20191127184453.229321-2-pasha.tatashin@soleen.com>
 <957930d0-8317-9086-c7a1-8de857f358c2@xen.org>
From:   Andrew Cooper <andrew.cooper3@citrix.com>
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Message-ID: <e785a585-8b71-8a49-285e-2bcb1437500b@citrix.com>
Date:   Fri, 29 Nov 2019 15:09:53 +0000
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In-Reply-To: <957930d0-8317-9086-c7a1-8de857f358c2@xen.org>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 29/11/2019 15:05, Julien Grall wrote:
> Hi,
>
> On 27/11/2019 18:44, Pavel Tatashin wrote:
>> diff --git a/arch/arm64/include/asm/xen/hypercall.h
>> b/arch/arm64/include/asm/xen/hypercall.h
>> index 3522cbaed316..1a74fb28607f 100644
>> --- a/arch/arm64/include/asm/xen/hypercall.h
>> +++ b/arch/arm64/include/asm/xen/hypercall.h
>> @@ -1 +1,29 @@
>> +#ifndef _ASM_ARM64_XEN_HYPERCALL_H
>> +#define _ASM_ARM64_XEN_HYPERCALL_H
>>   #include <xen/arm/hypercall.h>
>> +#include <linux/uaccess.h>
>> +
>> +static inline long privcmd_call(unsigned int call, unsigned long a1,
>> +                unsigned long a2, unsigned long a3,
>> +                unsigned long a4, unsigned long a5)
>
> I realize that privcmd_call is the only hypercall using Software PAN
> at the moment. However, dm_op needs the same as hypercall will be
> issued from userspace as well.

And dm_op() won't be the only example as we continue in cleaning up the
gaping hole that is privcmd.

> So I was wondering whether we should create a generic function (e.g.
> do_xen_hypercall() or do_xen_user_hypercall()) to cover the two
> hypercalls?

Probably a good idea.

~Andrew