1
Commit Graph

80798 Commits

Author SHA1 Message Date
Izik Eidus
82ce2c9683 KVM: Allow dynamic allocation of the mmu shadow cache size
The user is now able to set how many mmu pages will be allocated to the guest.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:50 +02:00
Izik Eidus
195aefde9c KVM: Add general accessors to read and write guest memory
Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:50 +02:00
Izik Eidus
290fc38da8 KVM: Remove the usage of page->private field by rmap
When kvm uses user-allocated pages in the future for the guest, we won't
be able to use page->private for rmap, since page->rmap is reserved for
the filesystem.  So we move the rmap base pointers to the memory slot.

A side effect of this is that we need to store the gfn of each gpte in
the shadow pages, since the memory slot is addressed by gfn, instead of
hfn like struct page.

Signed-off-by: Izik Eidus <izik@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:50 +02:00
Avi Kivity
f566e09fc2 KVM: VMX: Simplify vcpu_clear()
Now that smp_call_function_single() knows how to call a function on the
current cpu, there's no need to check explicitly.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:49 +02:00
Avi Kivity
eae5ecb5b9 KVM: VMX: Don't clear the vmcs if the vcpu is not loaded on any processor
Noted by Eddie Dong.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:49 +02:00
Laurent Vivier
b4c6abfef4 KVM: x86 emulator: Any legacy prefix after a REX prefix nullifies its effect
This patch modifies the management of REX prefix according behavior
I saw in Xen 3.1.  In Xen, this modification has been introduced by
Jan Beulich.

http://lists.xensource.com/archives/html/xen-changelog/2007-01/msg00081.html

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:49 +02:00
Laurent Vivier
a22436b7b8 KVM: Purify x86_decode_insn() error case management
The only valid case is on protected page access, other cases are errors.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:49 +02:00
Qing He
e4f8e03956 KVM: x86_emulator: no writeback for bt
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:49 +02:00
Laurent Vivier
a01af5ec51 KVM: x86 emulator: Remove no_wb, use dst.type = OP_NONE instead
Remove no_wb, use dst.type = OP_NONE instead, idea stollen from xen-3.1

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:49 +02:00
Laurent Vivier
05f086f87e KVM: x86 emulator: remove _eflags and use directly ctxt->eflags.
Remove _eflags and use directly ctxt->eflags. Caching eflags is not needed as
it is restored to vcpu by kvm_main.c:emulate_instruction() from ctxt->eflags
only if emulation doesn't fail.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:48 +02:00
Laurent Vivier
8cdbd2c9bf KVM: x86 emulator: split some decoding into functions for readability
To improve readability, move push, writeback, and grp 1a/2/3/4/5/9 emulation
parts into functions.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:48 +02:00
Ryan Harper
217648638c KVM: MMU: Ignore reserved bits in cr3 in non-pae mode
This patch removes the fault injected when the guest attempts to set reserved
bits in cr3.  X86 hardware doesn't generate a fault when setting reserved bits.
The result of this patch is that vmware-server, running within a kvm guest,
boots and runs memtest from an iso.

Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:48 +02:00
Avi Kivity
12b7d28fc1 KVM: MMU: Make flooding detection work when guest page faults are bypassed
When we allow guest page faults to reach the guests directly, we lose
the fault tracking which allows us to detect demand paging.  So we provide
an alternate mechnism by clearing the accessed bit when we set a pte, and
checking it later to see if the guest actually used it.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:48 +02:00
Avi Kivity
c7addb9020 KVM: Allow not-present guest page faults to bypass kvm
There are two classes of page faults trapped by kvm:
 - host page faults, where the fault is needed to allow kvm to install
   the shadow pte or update the guest accessed and dirty bits
 - guest page faults, where the guest has faulted and kvm simply injects
   the fault back into the guest to handle

The second class, guest page faults, is pure overhead.  We can eliminate
some of it on vmx using the following evil trick:
 - when we set up a shadow page table entry, if the corresponding guest pte
   is not present, set up the shadow pte as not present
 - if the guest pte _is_ present, mark the shadow pte as present but also
   set one of the reserved bits in the shadow pte
 - tell the vmx hardware not to trap faults which have the present bit clear

With this, normal page-not-present faults go directly to the guest,
bypassing kvm entirely.

Unfortunately, this trick only works on Intel hardware, as AMD lacks a
way to discriminate among page faults based on error code.  It is also
a little risky since it uses reserved bits which might become unreserved
in the future, so a module parameter is provided to disable it.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:48 +02:00
Avi Kivity
51c6cf662b KVM: VMX: Further reduce efer reloads
KVM avoids reloading the efer msr when the difference between the guest
and host values consist of the long mode bits (which are switched by
hardware) and the NX bit (which is emulated by the KVM MMU).

This patch also allows KVM to ignore SCE (syscall enable) when the guest
is running in 32-bit mode.  This is because the syscall instruction is
not available in 32-bit mode on Intel processors, so the SCE bit is
effectively meaningless.

Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:47 +02:00
Laurent Vivier
3427318fd2 KVM: Call x86_decode_insn() only when needed
Move emulate_ctxt to kvm_vcpu to keep emulate context when we exit from kvm
module. Call x86_decode_insn() only when needed. Modify x86_emulate_insn() to
not modify the context if it must be re-entered.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:47 +02:00
Laurent Vivier
1be3aa4718 KVM: emulate_instruction() calls now x86_decode_insn() and x86_emulate_insn()
emulate_instruction() calls now x86_decode_insn() and x86_emulate_insn().
x86_emulate_insn() is x86_emulate_memop() without the decoding part.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:47 +02:00
Laurent Vivier
8b4caf6650 KVM: x86 emulator: move all decoding process to function x86_decode_insn()
Split the decoding process into a new function x86_decode_insn().

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:47 +02:00
Laurent Vivier
e4e03deda8 KVM: x86 emulator: move all x86_emulate_memop() to a structure
Move all x86_emulate_memop() common variables between decode and execute to a
structure decode_cache.  This will help in later separating decode and
emulate.

            struct decode_cache {
                u8 twobyte;
                u8 b;
                u8 lock_prefix;
                u8 rep_prefix;
                u8 op_bytes;
                u8 ad_bytes;
                struct operand src;
                struct operand dst;
                unsigned long *override_base;
                unsigned int d;
                unsigned long regs[NR_VCPU_REGS];
                unsigned long eip;
                /* modrm */
                u8 modrm;
                u8 modrm_mod;
                u8 modrm_reg;
                u8 modrm_rm;
                u8 use_modrm_ea;
                unsigned long modrm_ea;
                unsigned long modrm_val;
           };

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:47 +02:00
Laurent Vivier
a7ddce3afc KVM: x86 emulator: remove unused functions
Remove #ifdef functions never used

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:46 +02:00
Anthony Liguori
7aa81cc047 KVM: Refactor hypercall infrastructure (v3)
This patch refactors the current hypercall infrastructure to better
support live migration and SMP.  It eliminates the hypercall page by
trapping the UD exception that would occur if you used the wrong hypercall
instruction for the underlying architecture and replacing it with the right
one lazily.

A fall-out of this patch is that the unhandled hypercalls no longer trap to
userspace.  There is very little reason though to use a hypercall to
communicate with userspace as PIO or MMIO can be used.  There is no code
in tree that uses userspace hypercalls.

[avi: fix #ud injection on vmx]

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:46 +02:00
Anthony Liguori
aca7f96600 KVM: x86 emulator: Add vmmcall/vmcall to x86_emulate (v3)
Add vmmcall/vmcall to x86_emulate.  Future patch will implement functionality
for these instructions.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-01-30 17:52:46 +02:00
Linus Torvalds
dd430ca20c Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86
* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86: (890 commits)
  x86: fix nodemap_size according to nodeid bits
  x86: fix overlap between pagetable with bss section
  x86: add PCI IDs to k8topology_64.c
  x86: fix early_ioremap pagetable ops
  x86: use the same pgd_list for PAE and 64-bit
  x86: defer cr3 reload when doing pud_clear()
  x86: early boot debugging via FireWire (ohci1394_dma=early)
  x86: don't special-case pmd allocations as much
  x86: shrink some ifdefs in fault.c
  x86: ignore spurious faults
  x86: remove nx_enabled from fault.c
  x86: unify fault_32|64.c
  x86: unify fault_32|64.c with ifdefs
  x86: unify fault_32|64.c by ifdef'd function bodies
  x86: arch/x86/mm/init_32.c printk fixes
  x86: arch/x86/mm/init_32.c cleanup
  x86: arch/x86/mm/init_64.c printk fixes
  x86: unify ioremap
  x86: fixes some bugs about EFI memory map handling
  x86: use reboot_type on EFI 32
  ...
2008-01-31 00:40:09 +11:00
Linus Torvalds
60e233172e [net] Gracefully handle shared e1000/1000e driver PCI ID's
Both the old e1000 driver and the new e1000e driver can drive some
PCI-Express e1000 cards, and we should avoid ambiguity about which
driver will pick up the support for those cards when both drivers are
enabled.

This solves the problem by having the old driver support those cards if
the new driver isn't configured, but otherwise ceding support for PCI
Express versions of the e1000 chipset to the newer driver.  Thus
allowing both legacy configurations where only the old driver is active
(and handles all chips it knows about) and the new configuration with
the new driver handling the more modern PCIE variants.

Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-31 00:30:15 +11:00
Linus Torvalds
44c45eb911 Make !NETFILTER_ADVANCED enable IP6_NF_MATCH_IPV6HEADER
We want IPV6HEADER matching for the non-advanced default netfilter
configuration, since it's part of the standard netfilter setup of at
least some distributions (eg Fedora).

Otherwise NETFILTER_ADVANCED loses much of its point, since even
non-advanced users would have to enable all the advanced options just to
get a working IPv6 netfilter setup.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-31 00:26:10 +11:00
Yinghai Lu
afadcd788f x86: fix nodemap_size according to nodeid bits
memnode.map is s16 array because of nodeid is 16 bit now.

so need to increase the nodemap_size according to that bits.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:12 +01:00
Yinghai Lu
9198715763 x86: fix overlap between pagetable with bss section
one early crash on one 8 node 256g machine:

Command line: console=uart8250,io,0x3f8,115200n8 initrd=kernel.org/mydisk11_x86_64.gz rw root=/dev/ram0 debug initcall_debug apic=debug acpi.debug_level=0x0000000f pci=routeirq ip=dhcp load_ramdisk=1 ramdisk_size=131072 BOOT_IMAGE=kernel.org/bzImage_2.6.25_k8.1
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009bc00 (usable)
 BIOS-e820: 000000000009bc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 00000000dffe0000 (usable)
 BIOS-e820: 00000000dffe0000 - 00000000dffee000 (ACPI data)
 BIOS-e820: 00000000dffee000 - 00000000dffff050 (ACPI NVS)
 BIOS-e820: 00000000dffff050 - 00000000e0000000 (reserved)
 BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
 BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
 BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
 BIOS-e820: 0000000100000000 - 0000004020000000 (usable)
Early serial console at I/O port 0x3f8 (options '115200n8')
console [uart0] enabled
end_pfn_map = 67239936
Kernel panic - not syncing: Duplicated early reservation d40000-e42000

Pid: 0, comm: swapper Not tainted 2.6.24-smp-g5a514e21-dirty #3

Call Trace:
 [<ffffffff80221545>] lapic_get_maxlvt+0x0/0x10
 [<ffffffff80221657>] clear_local_APIC+0x5/0xcf
 [<ffffffff80221726>] disable_local_APIC+0x5/0x17
 [<ffffffff8021fe16>] smp_send_stop+0x46/0x4c
 [<ffffffff80235293>] panic+0x94/0x13e
 [<ffffffff80bc3b03>] sctp_eps_proc_init+0x12/0x34
 [<ffffffff80b9f1c5>] reserve_early+0x30/0x6c
 [<ffffffff80803925>] init_memory_mapping+0x2cd/0x2dc
 [<ffffffff80b9dc01>] setup_arch+0x21f/0x44e
 [<ffffffff80b978be>] start_kernel+0x6f/0x2c7
 [<ffffffff80b971cc>] _sinittext+0x1cc/0x1d3

it turns out there is overlap between pgtable and bss...

in System.map we have
ffffffff80d40420 b rsi_table
ffffffff80d40620 B krb5_seq_lock
ffffffff80d40628 b i.20437
ffffffff80d40630 b xprt_rdma_inline_write_padding
ffffffff80d40638 b sunrpc_table_header
ffffffff80d40640 b zero
ffffffff80d40644 b min_memreg
ffffffff80d40648 b rpcrdma_tk_lock_g
ffffffff80d40650 B sctp_assocs_id_lock
ffffffff80d40658 B proc_net_sctp
ffffffff80d40660 B sctp_assocs_id
ffffffff80d40680 B sysctl_sctp_mem
ffffffff80d40690 B sysctl_sctp_rmem
ffffffff80d406a0 B sysctl_sctp_wmem
ffffffff80d406b0 b sctp_ctl_socket
ffffffff80d406b8 b sctp_pf_inet6_specific
ffffffff80d406c0 b sctp_pf_inet_specific
ffffffff80d406c8 b sctp_af_v4_specific
ffffffff80d406d0 b sctp_af_v6_specific
ffffffff80d406d8 b sctp_rand.33270
ffffffff80d406dc b sctp_memory_pressure
ffffffff80d406e0 b sctp_sockets_allocated
ffffffff80d406e4 b sctp_memory_allocated
ffffffff80d406e8 b sctp_sysctl_header
ffffffff80d406f0 b zero
ffffffff80d406f4 A __bss_stop
ffffffff80d406f4 A _end

need to round up table_start to PAGE_SIZE.

also make the panic more informative.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:12 +01:00
Joachim Deguara
bb4a1d644a x86: add PCI IDs to k8topology_64.c
This just adds the PCI IDs of AMD's family 10h and 11h CPU's northbridges to
k8topology discovery.

Signed-off-by: Joachim Deguara <joachim.deguara@amd.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:12 +01:00
Jeremy Fitzhardinge
f6df72e71e x86: fix early_ioremap pagetable ops
Put appropriate pagetable update hooks in so that paravirt knows
what's going on in there.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Jeremy Fitzhardinge
e3ed910db2 x86: use the same pgd_list for PAE and 64-bit
Use a standard list threaded through page->lru for maintaining the pgd
list on PAE.  This is the same as 64-bit, and seems saner than using a
non-standard list via page->index.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Jeremy Fitzhardinge
fa28ba21ce x86: defer cr3 reload when doing pud_clear()
PAE mode requires that we reload cr3 in order to guarantee that
changes to the pgd will be noticed by the processor.  This means that
in principle pud_clear needs to reload cr3 every time.  However,
because reloading cr3 implies a tlb flush, we want to avoid it where
possible.

pud_clear() is only used in a couple of places:
 - in free_pmd_range(), when pulling down a range of process address space, and
 - huge_pmd_unshare()

In both cases, the calling code will do a a tlb flush anyway, so
there's no need to do it within pud_clear().

In free_pmd_range(), the pud_clear is immediately followed by
pmd_free_tlb(); we can hook that to make the mmu_gather do an
unconditional full flush to make sure cr3 gets reloaded.

In huge_pmd_unshare, it is followed by flush_tlb_range, which always
results in a full cr3-reload tlb flush.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: William Irwin <wli@holomorphy.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Bernhard Kaindl
f212ec4b7b x86: early boot debugging via FireWire (ohci1394_dma=early)
This patch adds a new configuration option, which adds support for a new
early_param which gets checked in arch/x86/kernel/setup_{32,64}.c:setup_arch()
to decide wether OHCI-1394 FireWire controllers should be initialized and
enabled for physical DMA access to allow remote debugging of early problems
like issues ACPI or other subsystems which are executed very early.

If the config option is not enabled, no code is changed, and if the boot
paramenter is not given, no new code is executed, and independent of that,
all new code is freed after boot, so the config option can be even enabled
in standard, non-debug kernels.

With specialized tools, it is then possible to get debugging information
from machines which have no serial ports (notebooks) such as the printk
buffer contents, or any data which can be referenced from global pointers,
if it is stored below the 4GB limit and even memory dumps of of the physical
RAM region below the 4GB limit can be taken without any cooperation from the
CPU of the host, so the machine can be crashed early, it does not matter.

In the extreme, even kernel debuggers can be accessed in this way. I wrote
a small kgdb module and an accompanying gdb stub for FireWire which allows
to gdb to talk to kgdb using remote remory reads and writes over FireWire.

An version of the gdb stub fore FireWire is able to read all global data
from a system which is running a a normal kernel without any kernel debugger,
without any interruption or support of the system's CPU. That way, e.g. the
task struct and so on can be read and even manipulated when the physical DMA
access is granted.

A HOWTO is included in this patch, in Documentation/debugging-via-ohci1394.txt
and I've put a copy online at
ftp://ftp.suse.de/private/bk/firewire/docs/debugging-via-ohci1394.txt

It also has links to all the tools which are available to make use of it
another copy of it is online at:
ftp://ftp.suse.de/private/bk/firewire/kernel/ohci1394_dma_early-v2.diff

Signed-Off-By: Bernhard Kaindl <bk@suse.de>
Tested-By: Thomas Renninger <trenn@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Jeremy Fitzhardinge
6194ba6ff6 x86: don't special-case pmd allocations as much
In x86 PAE mode, stop treating pmds as a special case.  Previously
they were always allocated and freed with the pgd.  The modifies the
code to be the same as 64-bit mode, where they are allocated on
demand.

This is a step on the way to unifying 32/64-bit pagetable allocation
as much as possible.

There is a complicating wart, however.  When you install a new
reference to a pmd in the pgd, the processor isn't guaranteed to see
it unless you reload cr3.  Since reloading cr3 also has the
side-effect of flushing the tlb, this is an expense that we want to
avoid whereever possible.

This patch simply avoids reloading cr3 unless the update is to the
current pagetable.  Later patches will optimise this further.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: William Irwin <wli@holomorphy.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Harvey Harrison
fd40d6e318 x86: shrink some ifdefs in fault.c
The change from current to tsk in do_page_fault is safe as
this is set at the very beginning of the function.

Removes a likely() annotation from the 64-bit version, this
could have instead been added to 32-bit.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Jeremy Fitzhardinge
5b727a3b01 x86: ignore spurious faults
When changing a kernel page from RO->RW, it's OK to leave stale TLB
entries around, since doing a global flush is expensive and they pose
no security problem.  They can, however, generate a spurious fault,
which we should catch and simply return from (which will have the
side-effect of reloading the TLB to the current PTE).

This can occur when running under Xen, because it frequently changes
kernel pages from RW->RO->RW to implement Xen's pagetable semantics.
It could also occur when using CONFIG_DEBUG_PAGEALLOC, since it avoids
doing a global TLB flush after changing page permissions.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Harvey Harrison
b406ac61e9 x86: remove nx_enabled from fault.c
On !PAE 32-bit, _PAGE_NX will be 0, making is_prefetch always
return early.  The test is sufficient on PAE as __supported_pte_mask
is updated in the same places as nx_enabled in init_32.c which also
takes disable_nx into account.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Harvey Harrison
c61e211d99 x86: unify fault_32|64.c
Unify includes in moved fault.c.

Modify Makefiles to pick up unified file.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:11 +01:00
Harvey Harrison
f8c2ee224d x86: unify fault_32|64.c with ifdefs
Elimination of these ifdefs can be done in a unified file.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Harvey Harrison
1156e098c5 x86: unify fault_32|64.c by ifdef'd function bodies
It's about time to get on with unifying these files, elimination
of the ugly ifdefs can occur in the unified file.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Ingo Molnar
d7d119d777 x86: arch/x86/mm/init_32.c printk fixes
printk fixes. NOP in terms of functionality, but strings got
a bit larger due to the KERN_ markers that were added.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Ingo Molnar
8550eb9982 x86: arch/x86/mm/init_32.c cleanup
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Ingo Molnar
10f22dde55 x86: arch/x86/mm/init_64.c printk fixes
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Thomas Gleixner
14a62c34b1 x86: unify ioremap
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Huang, Ying
a3828064be x86: fixes some bugs about EFI memory map handling
This patch fixes some bugs of EFI memory handing code.

- On x86_64, it is possible that EFI memory map can not be mapped via
  identity map, so efi_map_memmap is removed, just use early_ioremap.

- On i386, the EFI memory map mapping take effect cross paging_init,
  so it is not necessary to use efi_map_memmap.

- EFI memory map is unmapped in efi_enter_virtual_mode to avoid
  early_ioremap leak.

Signed-off-by: Huang Ying <ying.huang@intel.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Huang, Ying
bed23c67fe x86: use reboot_type on EFI 32
This patch makes reboot_type of BOOT_EFI is used on i386 too. Because
correpsonding reboot code of i386 and x86_64 is merged.

Signed-off-by: Huang Ying <ying.huang@intel.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Harvey Harrison
19f0dda91e x86: unify page fault oops printing
This changes the oops dumping format for page faults to
be similar between X86_32 and 64.

This is the first user of printk_address on X86_32.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Harvey Harrison
b3279c7fd7 x86: introduce show_fault_oops helper to fault_32|64.c
This will help when unifying the oops dumping code on 32/64
bit.  No functional changes.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:10 +01:00
Harvey Harrison
35f3266ffb x86: add is_errata100 helper to fault_32|64.c
Further towards unifying these files, add another helper
in same spirit as is_errata93.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:09 +01:00
Harvey Harrison
29caf2f98c x86: add is_f00f_bug helper to fault_32|64.c
Further towards unifying these files, add another helper
in same spirit as is_errata93.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:09 +01:00
Ingo Molnar
9af993a926 x86: make ioremap() UC by default
Yes! A mere 120 c_p_a() fixing and rewriting patches later,
we are now confident that we can enable UC by default for
ioremap(), on x86 too.

Every other architectures was doing this already. Doing so
makes Linux more robust against MTRR mixups (which might go
unnoticed if BIOS writers test other OSs only - where PAT
might override bad MTRRs defaults).

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:34:09 +01:00