kernel_optimize_test/arch/x86
Suresh Siddha b27a43c1e9 x86, cpa: make the kernel physical mapping initialization a two pass sequence, fix
Jeremy Fitzhardinge wrote:

> I'd noticed that current tip/master hasn't been booting under Xen, and I
> just got around to bisecting it down to this change.
>
> commit 065ae73c5462d42e9761afb76f2b52965ff45bd6
> Author: Suresh Siddha <suresh.b.siddha@intel.com>
>
>    x86, cpa: make the kernel physical mapping initialization a two pass sequence
>
> This patch is causing Xen to fail various pagetable updates because it
> ends up remapping pagetables to RW, which Xen explicitly prohibits (as
> that would allow guests to make arbitrary changes to pagetables, rather
> than have them mediated by the hypervisor).

Instead of making init a two pass sequence, to satisfy the Intel's TLB
Application note (developer.intel.com/design/processor/applnots/317080.pdf
Section 6 page 26), we preserve the original page permissions
when fragmenting the large mappings and don't touch the existing memory
mapping (which satisfies Xen's requirements).

Only open issue is: on a native linux kernel, we will go back to mapping
the first 0-1GB kernel identity mapping as executable (because of the
static mapping setup in head_64.S). We can fix this in a different
patch if needed.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-10 19:29:21 +02:00
..
boot x86: boot: stub out unimplemented CPU feature words 2008-09-05 16:13:44 -07:00
configs x86: update defconfigs 2008-08-27 08:14:17 +02:00
crypto
ia32 tracehook: exec 2008-07-26 12:00:08 -07:00
kernel x86, cpa: rename PTE attribute macros for kernel direct mapping in early boot 2008-10-10 19:29:11 +02:00
kvm KVM: MMU: Fix torn shadow pte 2008-08-25 17:24:27 +03:00
lguest lguest: set max_pfn_mapped, growl loudly at Yinghai Lu 2008-07-29 09:58:31 +10:00
lib x86: msr: propagate errors from smp_call_function_single() 2008-08-25 17:45:48 -07:00
mach-default x86: add ->pre_time_init to x86_quirks 2008-07-20 09:25:52 +02:00
mach-es7000 x86: move the last Dprintk instance to pr_debug() 2008-07-21 21:58:34 +02:00
mach-generic
mach-rdc321x removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
mach-voyager Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
math-emu
mm x86, cpa: make the kernel physical mapping initialization a two pass sequence, fix 2008-10-10 19:29:21 +02:00
oprofile x86: fix oprofile + hibernation badness 2008-08-20 16:18:31 +02:00
pci Un-break printk strings in x86 PCI probing code 2008-09-02 10:38:28 -07:00
power x86: fix i486 suspend to disk CR4 oops 2008-08-18 08:50:19 +02:00
vdso Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
video
xen x86, xen: Use native_pte_flags instead of native_pte_val for .pte_flags 2008-09-06 20:13:58 +02:00
Kconfig [x86] Clean up MAXSMP Kconfig, and limit NR_CPUS to 512 2008-08-25 14:15:38 -07:00
Kconfig.cpu x86: disable static NOPLs on 32 bits 2008-09-08 11:35:43 -07:00
Kconfig.debug x86: Fix help message for STRICT_DEVMEM config option 2008-07-21 13:04:08 -07:00
Makefile x86, RDC321x: add to mach-default 2008-07-26 13:51:46 +02:00
Makefile_32.cpu