From: Matt Fleming <matt@console-pimps.org>
To: Dave Young <dyoung@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>, X86 ML <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, Borislav Petkov <bp@suse.de>,
Matthew Garrett <mjg59@srcf.ucam.org>,
"H. Peter Anvin" <hpa@zytor.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Vivek Goyal <vgoyal@redhat.com>,
linux-efi@vger.kernel.org, fwts-devel@lists.ubuntu.com
Subject: Re: [PATCH 12/12] EFI: Runtime services virtual mapping
Date: Sat, 12 Oct 2013 11:13:08 +0100 [thread overview]
Message-ID: <20131012101308.GI12321@console-pimps.org> (raw)
In-Reply-To: <20131012075443.GD7550@dhcp-16-126.nay.redhat.com>
On Sat, 12 Oct, at 03:54:44PM, Dave Young wrote:
> Boris:
>
> For the boot service region overlapping problem I have another idea,
> how about modify your mapping code to always mapping the RUNTIME region
> (non boot service region) firstly from the efi_va, then mapping other
> regions in order, in this way kexec 2nd kernel will be happy because
> it does not call SetVirtualAddressMap and it does not need the boot
> service area at all.
Coalescing the runtime regions together implies that the second kernel
would care about the fragmentation caused by unmapping the boot service
regions - it shouldn't. We've sliced up a considerable chunk of kernel
virtual address space (64G) and fragmentation shouldn't be an issue
right now.
Even if we run out of address space in the future due to fragmentation,
and end up needing to coalesce runtime regions, this would be
transparent to the kexec kernel because it's passed the memmap entries
through setup_data.
Though we are defining an ABI around the EFI address range
(0xffffffef00000000 - 0xffffffff00000000), such that it needs to be the
same between kernels, we must not make the layout of regions within that
range part of the ABI. We need the freedom to change the layout in the
future.
--
Matt Fleming, Intel Open Source Technology Center
next prev parent reply other threads:[~2013-10-12 10:13 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-19 14:54 [PATCH 00/11] EFI runtime services virtual mapping Borislav Petkov
2013-09-19 14:54 ` [PATCH 01/11] efi: Simplify EFI_DEBUG Borislav Petkov
2013-09-19 14:54 ` [PATCH 02/11] efi: Remove EFI_PAGE_SHIFT and EFI_PAGE_SIZE Borislav Petkov
2013-09-20 10:42 ` Matt Fleming
2013-09-21 15:21 ` Leif Lindholm
2013-09-21 15:41 ` Borislav Petkov
2013-09-21 15:50 ` Borislav Petkov
2013-09-21 16:01 ` Leif Lindholm
2013-09-21 16:03 ` Borislav Petkov
2013-09-21 15:59 ` Leif Lindholm
2013-09-19 14:54 ` [PATCH 03/11] x86, pageattr: Lookup address in an arbitrary PGD Borislav Petkov
2013-09-19 14:54 ` [PATCH 04/11] x86, pageattr: Add a PGD pagetable populating function Borislav Petkov
2013-09-19 14:54 ` [PATCH 05/11] x86, pageattr: Add a PUD " Borislav Petkov
2013-09-19 14:54 ` [PATCH 06/11] x86, pageattr: Add a PMD " Borislav Petkov
2013-09-19 14:54 ` [PATCH 07/11] x86, pageattr: Add a PTE " Borislav Petkov
2013-09-19 14:54 ` [PATCH 08/11] x86, pageattr: Add a PUD error unwinding path Borislav Petkov
2013-09-19 14:54 ` [PATCH 09/11] x86, pageattr: Add last levels of error path Borislav Petkov
2013-09-19 14:54 ` [PATCH 10/11] x86, cpa: Map in an arbitrary pgd Borislav Petkov
2013-09-19 14:54 ` [PATCH 11/11] EFI: Runtime services virtual mapping Borislav Petkov
2013-09-21 11:39 ` [PATCH -v2] " Borislav Petkov
2013-09-22 12:35 ` Dave Young
2013-09-22 13:37 ` Borislav Petkov
2013-09-22 14:00 ` Dave Young
2013-09-22 14:31 ` Dave Young
2013-09-22 15:27 ` H. Peter Anvin
2013-09-22 16:38 ` Borislav Petkov
2013-09-23 5:45 ` Dave Young
2013-09-24 2:52 ` Dave Young
2013-09-24 3:06 ` H. Peter Anvin
2013-09-24 4:57 ` Dave Young
2013-09-24 4:58 ` Dave Young
2013-09-24 5:23 ` Dave Young
2013-09-24 8:57 ` Dave Young
2013-09-24 9:43 ` Borislav Petkov
2013-09-24 10:01 ` Dave Young
2013-09-24 12:45 ` Dave Young
2013-10-02 10:04 ` Borislav Petkov
2013-10-02 15:43 ` H. Peter Anvin
2013-10-02 17:05 ` Borislav Petkov
2013-10-02 17:32 ` H. Peter Anvin
2013-10-02 18:42 ` Borislav Petkov
2013-10-02 18:46 ` H. Peter Anvin
2013-10-04 9:42 ` Borislav Petkov
2013-10-04 14:43 ` H. Peter Anvin
2013-10-04 14:50 ` Borislav Petkov
2013-09-23 5:47 ` Dave Young
2013-09-23 6:29 ` Borislav Petkov
2013-09-23 7:08 ` Dave Young
2013-09-23 8:45 ` Borislav Petkov
2013-09-25 9:24 ` Borislav Petkov
2013-09-20 7:29 ` [PATCH 00/11] EFI runtime " Dave Young
2013-09-20 8:19 ` Dave Young
2013-09-20 9:33 ` Borislav Petkov
2013-09-20 10:07 ` Dave Young
2013-09-20 9:05 ` Borislav Petkov
2013-09-20 9:44 ` Matt Fleming
2013-09-20 9:49 ` Matt Fleming
2013-09-20 10:02 ` Borislav Petkov
2013-09-20 11:51 ` Dave Young
2013-09-20 12:29 ` Matt Fleming
2013-09-20 14:04 ` Dave Young
2013-10-08 16:45 ` Borislav Petkov
2013-10-08 16:47 ` [PATCH 11/12] efi: Add an efi= kernel command line parameter Borislav Petkov
2013-10-28 11:02 ` Matt Fleming
2013-10-28 11:10 ` Borislav Petkov
2013-10-08 16:48 ` [PATCH 12/12] EFI: Runtime services virtual mapping Borislav Petkov
2013-10-10 8:06 ` Dave Young
2013-10-10 8:14 ` Dave Young
2013-10-10 8:58 ` Borislav Petkov
2013-10-10 12:34 ` Matt Fleming
2013-10-11 6:24 ` Dave Young
2013-10-11 7:41 ` Borislav Petkov
2013-10-12 7:54 ` Dave Young
2013-10-12 10:13 ` Matt Fleming [this message]
2013-10-12 10:30 ` Borislav Petkov
2013-10-13 3:11 ` Dave Young
2013-10-13 9:25 ` Borislav Petkov
2013-10-14 15:58 ` Borislav Petkov
2013-10-21 12:47 ` Dave Young
2013-10-21 13:37 ` Borislav Petkov
2013-10-21 15:04 ` Dave Young
2013-10-22 11:18 ` Borislav Petkov
2013-10-23 2:17 ` Dave Young
2013-10-23 12:25 ` Borislav Petkov
2013-10-23 12:37 ` Matthew Garrett
2013-10-23 12:51 ` Dave Young
2013-10-23 13:11 ` Borislav Petkov
2013-10-26 15:50 ` Matt Fleming
2013-10-13 3:06 ` Dave Young
2013-10-11 10:27 ` Matt Fleming
2013-10-11 13:42 ` Dave Young
2013-10-12 2:14 ` Dave Young
2013-10-14 15:57 ` Peter Jones
2013-10-16 6:27 ` Dave Young
2013-10-28 11:22 ` Matt Fleming
2013-10-28 16:00 ` Borislav Petkov
2013-10-29 6:47 ` Dave Young
2013-10-29 9:40 ` Borislav Petkov
2013-10-30 9:32 ` Dave Young
2013-10-30 10:45 ` Borislav Petkov
2013-10-31 7:07 ` Dave Young
2013-10-14 13:04 ` [PATCH 00/11] EFI runtime " Matt Fleming
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