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From: Thomas Gleixner <tglx@linutronix.de>
To: Hou Wenlong <houwenlong.hwl@antgroup.com>, linux-kernel@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	virtualization@lists.linux-foundation.org,
	Usama Arif <usama.arif@bytedance.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, Lai Jiangshan <jiangshan.ljs@antgroup.com>,
	VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
	Ingo Molnar <mingo@redhat.com>,
	xen-devel@lists.xenproject.org,
	Hou Wenlong <houwenlong.hwl@antgroup.com>,
	Pasha Tatashin <pasha.tatashin@soleen.com>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Brian Gerst <brgerst@gmail.com>, Borislav Petkov <bp@alien8.de>,
	Andy Lutomirski <luto@kernel.org>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Juergen Gross <jgross@suse.com>,
	Alexey Makhalov <amakhalov@vmware.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Woodhouse <dwmw@amazon.co.uk>,
	"Mike Rapoport \(IBM\)" <rppt@kernel.org>
Subject: Re: [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP
Date: Wed, 07 Jun 2023 20:29:32 +0200	[thread overview]
Message-ID: <877csfjfcj.ffs@tglx> (raw)
In-Reply-To: <cover.1684137557.git.houwenlong.hwl@antgroup.com>

On Mon, May 15 2023 at 16:19, Hou Wenlong wrote:

> This patchset unifies FIXADDR_TOP as a variable for x86, allowing the
> fixmap area to be movable and relocated with the kernel image in the
> x86/PIE patchset [0]. This enables the kernel image to be relocated in
> the top 512G of the address space.

What for? What's the use case.

Please provide a proper argument why this is generally useful and
important.

Thanks,

        tglx
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

WARNING: multiple messages have this Message-ID (diff)
From: Thomas Gleixner <tglx@linutronix.de>
To: Hou Wenlong <houwenlong.hwl@antgroup.com>, linux-kernel@vger.kernel.org
Cc: Lai Jiangshan <jiangshan.ljs@antgroup.com>,
	Hou Wenlong <houwenlong.hwl@antgroup.com>,
	Alexey Makhalov <amakhalov@vmware.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Andy Lutomirski <luto@kernel.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Borislav Petkov <bp@alien8.de>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Brian Gerst <brgerst@gmail.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	David Woodhouse <dwmw@amazon.co.uk>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Juergen Gross <jgross@suse.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	"Mike Rapoport (IBM)" <rppt@kernel.org>,
	Pasha Tatashin <pasha.tatashin@soleen.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"Srivatsa S. Bhat (VMware)" <srivatsa@csail.mit.edu>,
	Suren Baghdasaryan <surenb@google.com>,
	Usama Arif <usama.arif@bytedance.com>,
	virtualization@lists.linux-foundation.org,
	VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
	x86@kernel.org, xen-devel@lists.xenproject.org
Subject: Re: [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP
Date: Wed, 07 Jun 2023 20:29:32 +0200	[thread overview]
Message-ID: <877csfjfcj.ffs@tglx> (raw)
In-Reply-To: <cover.1684137557.git.houwenlong.hwl@antgroup.com>

On Mon, May 15 2023 at 16:19, Hou Wenlong wrote:

> This patchset unifies FIXADDR_TOP as a variable for x86, allowing the
> fixmap area to be movable and relocated with the kernel image in the
> x86/PIE patchset [0]. This enables the kernel image to be relocated in
> the top 512G of the address space.

What for? What's the use case.

Please provide a proper argument why this is generally useful and
important.

Thanks,

        tglx


  parent reply	other threads:[~2023-06-07 18:29 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-15  8:19 [PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP Hou Wenlong
2023-05-15  8:19 ` [PATCH RFC 1/4] x86/vsyscall: Don't use set_fixmap() to map vsyscall page Hou Wenlong
2023-05-15  8:19 ` [PATCH RFC 2/4] x86/xen: Pin up to VSYSCALL_ADDR when vsyscall page is out of fixmap area Hou Wenlong
2023-05-15  8:19 ` [PATCH RFC 3/4] x86/fixmap: Move vsyscall page " Hou Wenlong
2023-05-15  8:19 ` [PATCH RFC 4/4] x86/fixmap: Unify FIXADDR_TOP Hou Wenlong
2023-06-07  7:44 ` [PATCH RFC 0/4] " Hou Wenlong
2023-06-07 12:49 ` Dave Hansen
2023-06-07 12:49   ` Dave Hansen
2023-06-08  9:33   ` Hou Wenlong
2023-06-10 18:37     ` Thomas Gleixner
2023-06-10 18:37       ` Thomas Gleixner
2023-06-07 18:29 ` Thomas Gleixner [this message]
2023-06-07 18:29   ` Thomas Gleixner

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