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Date: Tue, 24 Nov 2020 11:29:19 +0200
From: Mike Rapoport <rppt@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Subject: Re: [PATCH v10 0/9] mm: introduce memfd_secret system call to create
 "secret" memory areas
Message-ID: <20201124092919.GI8537@kernel.org>
References: <20201123095432.5860-1-rppt@kernel.org>
 <CALCETrXr-9ABs7rzXcCrh1VXn-15AfpwjA6bQA7aU9Ta7DR+bw@mail.gmail.com>
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On Mon, Nov 23, 2020 at 07:28:22AM -0800, Andy Lutomirski wrote:
> On Mon, Nov 23, 2020 at 1:54 AM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > Hi,
> >
> > This is an implementation of "secret" mappings backed by a file descriptor.
> >
> > The file descriptor backing secret memory mappings is created using a
> > dedicated memfd_secret system call The desired protection mode for the
> > memory is configured using flags parameter of the system call. The mmap()
> > of the file descriptor created with memfd_secret() will create a "secret"
> > memory mapping. The pages in that mapping will be marked as not present in
> > the direct map and will have desired protection bits set in the user page
> > table. For instance, current implementation allows uncached mappings.
> 
> I'm still not ready to ACK uncached mappings on x86.  I'm fine with
> the concept of allowing privileged users to create UC memory on x86
> for testing and experimentation, but it's a big can of worms in
> general. 

Ok, let's move forward without UC. 

-- 
Sincerely yours,
Mike.
_______________________________________________
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Date:   Tue, 24 Nov 2020 11:29:19 +0200
From:   Mike Rapoport <rppt@kernel.org>
To:     Andy Lutomirski <luto@kernel.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christopher Lameter <cl@linux.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        David Hildenbrand <david@redhat.com>,
        Elena Reshetova <elena.reshetova@intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        James Bottomley <jejb@linux.ibm.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Matthew Wilcox <willy@infradead.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
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        Tycho Andersen <tycho@tycho.ws>, Will Deacon <will@kernel.org>,
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        linux-riscv@lists.infradead.org, X86 ML <x86@kernel.org>
Subject: Re: [PATCH v10 0/9] mm: introduce memfd_secret system call to create
 "secret" memory areas
Message-ID: <20201124092919.GI8537@kernel.org>
References: <20201123095432.5860-1-rppt@kernel.org>
 <CALCETrXr-9ABs7rzXcCrh1VXn-15AfpwjA6bQA7aU9Ta7DR+bw@mail.gmail.com>
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On Mon, Nov 23, 2020 at 07:28:22AM -0800, Andy Lutomirski wrote:
> On Mon, Nov 23, 2020 at 1:54 AM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > Hi,
> >
> > This is an implementation of "secret" mappings backed by a file descriptor.
> >
> > The file descriptor backing secret memory mappings is created using a
> > dedicated memfd_secret system call The desired protection mode for the
> > memory is configured using flags parameter of the system call. The mmap()
> > of the file descriptor created with memfd_secret() will create a "secret"
> > memory mapping. The pages in that mapping will be marked as not present in
> > the direct map and will have desired protection bits set in the user page
> > table. For instance, current implementation allows uncached mappings.
> 
> I'm still not ready to ACK uncached mappings on x86.  I'm fine with
> the concept of allowing privileged users to create UC memory on x86
> for testing and experimentation, but it's a big can of worms in
> general. 

Ok, let's move forward without UC. 

-- 
Sincerely yours,
Mike.

From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 24 Nov 2020 11:29:19 +0200
From: Mike Rapoport <rppt@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Subject: Re: [PATCH v10 0/9] mm: introduce memfd_secret system call to create
 "secret" memory areas
Message-ID: <20201124092919.GI8537@kernel.org>
References: <20201123095432.5860-1-rppt@kernel.org>
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On Mon, Nov 23, 2020 at 07:28:22AM -0800, Andy Lutomirski wrote:
> On Mon, Nov 23, 2020 at 1:54 AM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > Hi,
> >
> > This is an implementation of "secret" mappings backed by a file descriptor.
> >
> > The file descriptor backing secret memory mappings is created using a
> > dedicated memfd_secret system call The desired protection mode for the
> > memory is configured using flags parameter of the system call. The mmap()
> > of the file descriptor created with memfd_secret() will create a "secret"
> > memory mapping. The pages in that mapping will be marked as not present in
> > the direct map and will have desired protection bits set in the user page
> > table. For instance, current implementation allows uncached mappings.
> 
> I'm still not ready to ACK uncached mappings on x86.  I'm fine with
> the concept of allowing privileged users to create UC memory on x86
> for testing and experimentation, but it's a big can of worms in
> general. 

Ok, let's move forward without UC. 

-- 
Sincerely yours,
Mike.

_______________________________________________
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Date: Tue, 24 Nov 2020 11:29:19 +0200
From: Mike Rapoport <rppt@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Christopher Lameter <cl@linux.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	David Hildenbrand <david@redhat.com>,
	Elena Reshetova <elena.reshetova@intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	James Bottomley <jejb@linux.ibm.com>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Matthew Wilcox <willy@infradead.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Peter Zijlstra <peterz@infradead.org>,
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Subject: Re: [PATCH v10 0/9] mm: introduce memfd_secret system call to create
 "secret" memory areas
Message-ID: <20201124092919.GI8537@kernel.org>
References: <20201123095432.5860-1-rppt@kernel.org>
 <CALCETrXr-9ABs7rzXcCrh1VXn-15AfpwjA6bQA7aU9Ta7DR+bw@mail.gmail.com>
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On Mon, Nov 23, 2020 at 07:28:22AM -0800, Andy Lutomirski wrote:
> On Mon, Nov 23, 2020 at 1:54 AM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > Hi,
> >
> > This is an implementation of "secret" mappings backed by a file descriptor.
> >
> > The file descriptor backing secret memory mappings is created using a
> > dedicated memfd_secret system call The desired protection mode for the
> > memory is configured using flags parameter of the system call. The mmap()
> > of the file descriptor created with memfd_secret() will create a "secret"
> > memory mapping. The pages in that mapping will be marked as not present in
> > the direct map and will have desired protection bits set in the user page
> > table. For instance, current implementation allows uncached mappings.
> 
> I'm still not ready to ACK uncached mappings on x86.  I'm fine with
> the concept of allowing privileged users to create UC memory on x86
> for testing and experimentation, but it's a big can of worms in
> general. 

Ok, let's move forward without UC. 

-- 
Sincerely yours,
Mike.


From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 24 Nov 2020 11:29:19 +0200
From: Mike Rapoport <rppt@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Subject: Re: [PATCH v10 0/9] mm: introduce memfd_secret system call to create
 "secret" memory areas
Message-ID: <20201124092919.GI8537@kernel.org>
References: <20201123095432.5860-1-rppt@kernel.org>
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On Mon, Nov 23, 2020 at 07:28:22AM -0800, Andy Lutomirski wrote:
> On Mon, Nov 23, 2020 at 1:54 AM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > Hi,
> >
> > This is an implementation of "secret" mappings backed by a file descriptor.
> >
> > The file descriptor backing secret memory mappings is created using a
> > dedicated memfd_secret system call The desired protection mode for the
> > memory is configured using flags parameter of the system call. The mmap()
> > of the file descriptor created with memfd_secret() will create a "secret"
> > memory mapping. The pages in that mapping will be marked as not present in
> > the direct map and will have desired protection bits set in the user page
> > table. For instance, current implementation allows uncached mappings.
> 
> I'm still not ready to ACK uncached mappings on x86.  I'm fine with
> the concept of allowing privileged users to create UC memory on x86
> for testing and experimentation, but it's a big can of worms in
> general. 

Ok, let's move forward without UC. 

-- 
Sincerely yours,
Mike.

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel