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- 16 Jul, 2008 22 commits
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Jeremy Fitzhardinge authored
We set up entrypoints for syscall and sysenter. sysenter is only used for 32-bit compat processes, whereas syscall can be used in by both 32 and 64-bit processes. Signed-off-by:
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.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
Because the x86_64 architecture does not enforce segment limits, Xen cannot protect itself with them as it does in 32-bit mode. Therefore, to protect itself, it runs the guest kernel in ring 3. Since it also runs the guest userspace in ring3, the guest kernel must maintain a second pagetable for its userspace, which does not map kernel space. Naturally, the guest kernel pagetables map both kernel and userspace. The userspace pagetable is attached to the corresponding kernel pagetable via the pgd's page->private field. It is allocated and freed at the same time as the kernel pgd via the paravirt_pgd_alloc/free hooks. Fortunately, the user pagetable is almost entirely shared with the kernel pagetable; the only difference is the pgd page itself. set_pgd will populate all entries in the kernel pagetable, and also set the corresponding user pgd entry if the address is less than STACK_TOP_MAX. The user pagetable must be pinned and unpinned with the kernel one, but because the pagetables are aliased, pgd_walk() only needs to be called on the kernel pagetable. The user pgd page is then pinned/unpinned along with the kernel pgd page. xen_write_cr3 must write both the kernel and user cr3s. The init_mm.pgd pagetable never has a user pagetable allocated for it, because it can never be used while running usermode. One awkward area is that early in boot the page structures are not available. No user pagetable can exist at that point, but it complicates the logic to avoid looking at the page structure. Signed-off-by:
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Eduardo Habkost authored
We need to do this, otherwise we can get a GPF on hypercall return after TLS descriptor is cleared but %fs is still pointing to it. Signed-off-by:
Eduardo Habkost <ehabkost@redhat.com> Signed-off-by:
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Jeremy Fitzhardinge authored
Point the boot params cmd_line_ptr to the domain-builder-provided command line. Signed-off-by:
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Eduardo Habkost authored
xen-64: implement xen_load_gs_index() Signed-off-by:
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Jeremy Fitzhardinge authored
The x86_64 interrupt subsystem is oriented towards vectors, as opposed to a flat irq space as it is in x86-32. This patch adds a simple identity irq->vector mapping so that we can continue to feed irqs into do_IRQ() and get a good result. Ideally x86_32 will unify with the 64-bit code and use vectors too. At that point we can move to mapping event channels to vectors, which will allow us to economise on irqs (so per-cpu event channels can share irqs, rather than having to allocte one per cpu, for example). Signed-off-by:
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Jeremy Fitzhardinge authored
swapgs is a no-op under Xen, because the hypervisor makes sure the right version of %gs is current when switching between user and kernel modes. This means that the swapgs "implementation" can be inlined and used when the stack is unsafe (usermode). Unfortunately, it means that disabling patching will result in a non-booting kernel... Signed-off-by:
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Jeremy Fitzhardinge authored
Xen pushes two extra words containing the values of rcx and r11. This pvop hook copies the words back into their appropriate registers, and cleans them off the stack. This leaves the stack in native form, so the normal handler can run unchanged. Signed-off-by:
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Eduardo Habkost authored
Changed to use the (to-be-)unified descriptor structs. Signed-off-by:
Eduardo Habkost <ehabkost@Rawhide-64.localdomain> Signed-off-by:
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Jeremy Fitzhardinge authored
We need to wait until the page structure is available to use the proper pagetable page alloc/release operations, since they use struct page to determine if a pagetable is pinned. This happened to work in 32bit because nobody allocated new pagetable pages in the interim between xen_pagetable_setup_done and xen_post_allocator_init, but the 64-bit kenrel needs to allocate more pagetable levels. Signed-off-by:
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Jeremy Fitzhardinge authored
Rearrange the pagetable initialization to share code with the 64-bit kernel. Rather than deferring anything to pagetable_setup_start, just set up an initial pagetable in swapper_pg_dir early at startup, and create an additional 8MB of physical memory mappings. This matches the native head_32.S mappings to a large degree, and allows the rest of the pagetable setup to continue without much Xen vs. native difference. Signed-off-by:
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Jeremy Fitzhardinge authored
Early in boot, map a chunk of extra physical memory for use later on. We need a pool of mapped pages to allocate further pages to construct pagetables mapping all physical memory. Signed-off-by:
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Jeremy Fitzhardinge authored
It also doesn't need the 32-bit hack version of set_pte for initial pagetable construction, so just make it use the real thing. Signed-off-by:
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Jeremy Fitzhardinge authored
Set up the initial pagetables to map the kernel mapping into the physical mapping space. This makes __va() usable, since it requires physical mappings. Signed-off-by:
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Jeremy Fitzhardinge authored
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Jeremy Fitzhardinge authored
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Jeremy Fitzhardinge authored
As a stopgap until Mike Travis's x86-64 gs-based percpu patches are ready, provide workaround functions for x86_read/write_percpu for Xen's use. Specifically, this means that we can't really make use of vcpu placement, because we can't use a single gs-based memory access to get to vcpu fields. So disable all that for now. Signed-off-by:
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Jeremy Fitzhardinge authored
Move all the smp_ops setup into smp.c, allowing a lot of things to become static. Signed-off-by:
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Jeremy Fitzhardinge authored
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Jeremy Fitzhardinge authored
We need extra pv_mmu_ops for 64-bit, to deal with the extra level of pagetable. Signed-off-by:
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Jeremy Fitzhardinge authored
We need set_pte to work from a relatively early point, so enable it from the start. Signed-off-by:
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Eduardo Habkost authored
Call paravirt_pagetable_setup_{start,done} These paravirt_ops functions were not being called on x86_64. Signed-off-by:
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- 09 Jul, 2008 1 commit
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Alok Kataria authored
Rename the paravirtualized calculate_cpu_khz to calibrate_tsc. In all cases, we actually calibrate_tsc and use that as the cpu_khz value. Signed-off-by:
Alok N Kataria <akataria@vmware.com> Signed-off-by:
Dan Hecht <dhecht@vmware.com> Cc: Dan Hecht <dhecht@vmware.com> Signed-off-by:
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- 08 Jul, 2008 4 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:
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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 <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
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
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- 26 Jun, 2008 1 commit
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Jens Axboe authored
This converts x86, x86-64, and xen to use the new helpers for smp_call_function() and friends, and adds support for smp_call_function_single(). Acked-by:
Jens Axboe <jens.axboe@oracle.com>
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- 25 Jun, 2008 2 commits
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Jeremy Fitzhardinge authored
Xen has a pte update function which will update a pte while preserving its accessed and dirty bits. This means that ptep_modify_prot_start() can be implemented as a simple read of the pte value. The hardware may update the pte in the meantime, but ptep_modify_prot_commit() updates it while preserving any changes that may have happened in the meantime. The updates in ptep_modify_prot_commit() are batched if we're currently in lazy mmu mode. The mmu_update hypercall can take a batch of updates to perform, but this code doesn't make particular use of that feature, in favour of using generic multicall batching to get them all into the hypervisor. The net effect of this is that each mprotect pte update turns from two expensive trap-and-emulate faults into they hypervisor into a single hypercall whose cost is amortized in a batched multicall. Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Acked-by:
Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Jeremy Fitzhardinge authored
This patch adds paravirt-ops hooks in pv_mmu_ops for ptep_modify_prot_start and ptep_modify_prot_commit. This allows the hypervisor-specific backends to implement these in some more efficient way. Signed-off-by:
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- 24 Jun, 2008 1 commit
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Jeremy Fitzhardinge authored
Non-PAE operation has been deprecated in Xen for a while, and is rarely tested or used. xen-unstable has now officially dropped non-PAE support. Since Xen/pvops' non-PAE support has also been broken for a while, we may as well completely drop it altogether. Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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- 20 Jun, 2008 3 commits
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Jeremy Fitzhardinge authored
Signed-off-by:
Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by:
Juan Quintela <quintela@redhat.com> Signed-off-by:
Mark McLoughlin <markmc@redhat.com> Signed-off-by:
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Jeremy Fitzhardinge authored
[ Stable: this isn't a bugfix in itself, but it's a pre-requiste for "xen: don't drop NX bit" ] Signed-off-by:
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Jeremy Fitzhardinge authored
[ Stable: this isn't a bugfix in itself, but it's a pre-requiste for "xen: don't drop NX bit" ] Signed-off-by:
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- 02 Jun, 2008 2 commits
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Jeremy Fitzhardinge authored
If we're using vcpu_info mapping, then make sure its restored on all processors before relasing them from stop_machine. The only complication is that if this fails, we can't continue because we've already made assumptions that the mapping is available (baked in calls to the _direct versions of the functions, for example). Fortunately this can only happen with a 32-bit hypervisor, which may possibly run out of mapping space. On a 64-bit hypervisor, this is a non-issue. Signed-off-by:
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Jeremy Fitzhardinge authored
When operating on an unpinned pagetable (ie, one under construction or destruction), it isn't necessary to use a hypercall to update a pud/pmd entry. Jan Beulich observed that a similar optimisation avoided many thousands of hypercalls while doing a kernel build. One tricky part is that early in the kernel boot there's no page structure, so we can't check to see if the page is pinned. In that case, we just always use the hypercall. Signed-off-by:
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- 31 May, 2008 1 commit
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Yinghai Lu authored
introduce init_pg_table_start, so xen PV could specify the value. Signed-off-by:
Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by:
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- 27 May, 2008 3 commits
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Jeremy Fitzhardinge authored
This patch implements Xen save/restore and migration. Saving is triggered via xenbus, which is polled in drivers/xen/manage.c. When a suspend request comes in, the kernel prepares itself for saving by: 1 - Freeze all processes. This is primarily to prevent any partially-completed pagetable updates from confusing the suspend process. If CONFIG_PREEMPT isn't defined, then this isn't necessary. 2 - Suspend xenbus and other devices 3 - Stop_machine, to make sure all the other vcpus are quiescent. The Xen tools require the domain to run its save off vcpu0. 4 - Within the stop_machine state, it pins any unpinned pgds (under construction or destruction), performs canonicalizes various other pieces of state (mostly converting mfns to pfns), and finally 5 - Suspend the domain Restore reverses the steps used to save the domain, ending when all the frozen processes are thawed. Signed-off-by: -
Jeremy Fitzhardinge authored
When saving a domain, the Xen tools need to remap all our mfns to portable pfns. In order to remap our p2m table, it needs to know where all its pages are, so maintain the references to the p2m table for it to use. Signed-off-by:
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Jeremy Fitzhardinge authored
Rename dummy_shared_info to xen_dummy_shared_info and make it non-static, in anticipation of users outside of enlighten.c Signed-off-by:
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