- 08 Jul, 2008 40 commits
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Jeremy Fitzhardinge authored
64-bit Xen pushes a couple of extra words onto an exception frame. Add a hook to deal with them. Signed-off-by:
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: xen-devel <xen-devel@lists.xensource.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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Jeremy Fitzhardinge authored
It's never safe to call a swapgs pvop when the user stack is current - it must be inline replaced. Rather than making a call, the SWAPGS_UNSAFE_STACK pvop always just puts "swapgs" as a placeholder, which must either be replaced inline or trap'n'emulated (somehow). Signed-off-by:
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Jeremy Fitzhardinge authored
Replace privileged instructions with the corresponding pvops in ia32entry.S. Signed-off-by:
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Jeremy Fitzhardinge authored
In a 64-bit system, we need separate sysret/sysexit operations to return to a 32-bit userspace. Signed-off-by:
Jeremy Fitzhardinge <jeremy.fitzhardinge@citirx.com> Cc: xen-devel <xen-devel@lists.xensource.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by:
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Jeremy Fitzhardinge authored
There's no need to combine restoring the user rsp within the sysret pvop, so split it out. This makes the pvop's semantics closer to the machine instruction. Signed-off-by:
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Jeremy Fitzhardinge authored
Don't conflate sysret and sysexit; they're different instructions with different semantics, and may be in use at the same time (at least within the same kernel, depending on whether its an Intel or AMD system). sysexit - just return to userspace, does no register restoration of any kind; must explicitly atomically enable interrupts. sysret - reloads flags from r11, so no need to explicitly enable interrupts on 64-bit, responsible for restoring usermode %gs Signed-off-by: -
Jeremy Fitzhardinge authored
This is needed when the kernel is running on RING3, such as under Xen. x86_64 has a weird feature that makes it #GP on iret when SS is a null descriptor. This need to be tested on bare metal to make sure it doesn't cause any problems. AMD specs say SS is always ignored (except on iret?). Signed-off-by:
Eduardo Habkost <ehabkost@redhat.com> Signed-off-by:
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Jeremy Fitzhardinge authored
We must do this because load_TLS() may need to clear %fs and %gs. (e.g. under Xen). Signed-off-by:
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Jeremy Fitzhardinge authored
We must leave lazy mode before switching the %fs and %gs selectors. Signed-off-by:
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Eduardo Habkost authored
We will need to set a pte on l3_user_pgt. Extract set_pte_vaddr_pud() from set_pte_vaddr(), that will accept the l3 page table as parameter. This change should be a no-op for existing code. Signed-off-by:
Mark McLoughlin <markmc@redhat.com> Signed-off-by:
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Jeremy Fitzhardinge authored
Because Xen doesn't support PSE mappings in guests, all code which assumed the presence of PSE has been changed to fall back to smaller mappings if necessary. As a result, PSE is optional rather than required (though still used whereever possible). Signed-off-by:
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Jeremy Fitzhardinge authored
If PSE is not available, then fall back to 4k page mappings for the vmemmap area. Signed-off-by:
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Jeremy Fitzhardinge authored
This makes a few of changes to the construction of the initial pagetables to work better with paravirt_ops/Xen. The main areas are: 1. Support non-PSE mapping of memory, since Xen doesn't currently allow 2M pages to be mapped in guests. 2. Make sure that the ioremap alias of all pages are dropped before attaching the new page to the pagetable. This avoids having writable aliases of pagetable pages. 3. Preserve existing pagetable entries, rather than overwriting. Its possible that a fair amount of pagetable has already been constructed, so reuse what's already in place rather than ignoring and overwriting it. The algorithm relies on the invariant that any page which is part of the kernel pagetable is itself mapped in the linear memory area. This way, it can avoid using ioremap on a pagetable page. The invariant holds because it maps memory from low to high addresses, and also allocates memory from low to high. Each allocated page can map at least 2M of address space, so the mapped area will always progress much faster than the allocated area. It relies on the early boot code mapping enough pages to get started. Signed-off-by: -
Jeremy Fitzhardinge authored
Split x86_64_start_kernel() into two pieces: The first essentially cleans up after head_64.S. It clears the bss, zaps low identity mappings, sets up some early exception handlers. The second part preserves the boot data, reserves the kernel's text/data/bss, pagetables and ramdisk, and then starts the kernel proper. This split is so that Xen can call the second part to do the set up it needs done. It doesn't need any of the first part setups, because it doesn't boot via head_64.S, and its redundant or actively damaging. Signed-off-by:
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Jeremy Fitzhardinge authored
This matches 32 bit. Signed-off-by:
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Eduardo Habkost authored
Set __PAGE_OFFSET to the most negative possible address + 16*PGDIR_SIZE. The gap is to allow a space for a hypervisor to fit. The gap is more or less arbitrary, but it's what Xen needs. When booting native, kernel/head_64.S has a set of compile-time generated pagetables used at boot time. This patch removes their absolutely hard-coded layout, and makes it parameterised on __PAGE_OFFSET (and __START_KERNEL_map). Signed-off-by:
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Jeremy Fitzhardinge authored
On 32-bit it's best to use a %cs: prefix to access memory where the other segments may not bet set up properly yet. On 64-bit it's best to use a rip-relative addressing mode. Define PARA_INDIRECT() to abstract this and generate the proper addressing mode in each case. Signed-off-by:
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Jeremy Fitzhardinge authored
Rather than just jumping to 0 when there's a missing operation, raise a BUG. Signed-off-by:
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Jeremy Fitzhardinge authored
Jan Beulich points out that vmalloc_sync_all() assumes that the kernel's pmd is always expected to be present in the pgd. The current pgd construction code will add the pgd to the pgd_list before its pmds have been pre-populated, thereby making it visible to vmalloc_sync_all(). However, because pgd_prepopulate_pmd also does the allocation, it may block and cannot be done under spinlock. The solution is to preallocate the pmds out of the spinlock, then populate them while holding the pgd_list lock. This patch also pulls the pmd preallocation and mop-up functions out to be common, assuming that the compiler will generate no code for them when PREALLOCTED_PMDS is 0. Also, there's no need for pgd_ctor to clear the pgd again, since it's allocated as a zeroed page. Signed-off-by:
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Jeremy Fitzhardinge authored
Add hooks which are called at pgd_alloc/free time. The pgd_alloc hook may return an error code, which if non-zero, causes the pgd allocation to be failed. The hooks may be used to allocate/free auxillary per-pgd information. also fix: > * Ingo Molnar <mingo@elte.hu> wrote: > > include/asm/pgalloc.h: In function ‘paravirt_pgd_free': > include/asm/pgalloc.h:14: error: parameter name omitted > arch/x86/kernel/entry_64.S: In file included from > arch/x86/kernel/traps_64.c:51:include/asm/pgalloc.h: In function ‘paravirt_pgd_free': > include/asm/pgalloc.h:14: error: parameter name omitted Signed-off-by:
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Jeremy Fitzhardinge authored
vmalloc_sync_all() is only called from register_die_notifier and alloc_vm_area. Neither is on any performance-critical paths, so vmalloc_sync_all() itself is not on any hot paths. Given that the optimisations in vmalloc_sync_all add a fair amount of code and complexity, and are fairly hard to evaluate for correctness, it's better to just remove them to simplify the code rather than worry about its absolute performance. Signed-off-by:
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Jeremy Fitzhardinge authored
Add sync_cmpxchg to match 32-bit's sync_cmpxchg. Signed-off-by:
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Jeremy Fitzhardinge authored
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Ingo Molnar authored
fix: In file included from arch/x86/kernel/setup.c:118: include/asm/highmem.h:64: error: expected identifier or ‘(' before ‘do' include/asm/highmem.h:64: error: expected identifier or ‘(' before ‘while' include/asm/highmem.h:67: error: expected identifier or ‘(' before ‘do' include/asm/highmem.h:67: error: expected identifier or ‘(' before ‘while' Signed-off-by: -
Ingo Molnar authored
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Yinghai Lu authored
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Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by:
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Yinghai Lu authored
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Yinghai Lu authored
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Yinghai Lu authored
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Yinghai Lu authored
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Yinghai Lu authored
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Yinghai Lu authored
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Yinghai Lu authored
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Yinghai Lu authored
and let 64 bit use that instead of setup_64.c [ mingo@elte.hu ] x86: build fix fix: arch/x86/kernel/setup.c: In function ‘setup_arch': arch/x86/kernel/setup.c:561: error: implicit declaration of function ‘efi_reserve_early' and: arch/x86/kernel/setup.c:766: error: implicit declaration of function 'init_cpu_to_node' and: arch/x86/kernel/setup.c:676: warning: operation on 'max_pfn_mapped' may be undefined Signed-off-by:
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Yinghai Lu authored
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Yinghai Lu authored
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Yinghai Lu authored
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Yinghai Lu authored
those variables are not needed by 64 bit. Signed-off-by:
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Yinghai Lu authored
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Yinghai Lu authored
So remove outdated comments Signed-off-by:
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