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* lguest: Revert 1ce70c4fac3c3954bd48c035f448793867592bc0, fix real problem.Rusty Russell2008-03-10
| | | | | | | | | | | | | | | | | | | | Ahmed managed to crash the Host in release_pgd(), which cannot be a Guest bug, and indeed it wasn't. The bug was that handing a 0 as the address of the toplevel page table being manipulated can cause the lookup code in find_pgdir() to return an uninitialized cache entry (we shadow up to 4 top level page tables for each Guest). Commit 37cc8d7f963ba2deec29c9b68716944516a3244f introduced this behaviour in the Guest, uncovering the bug. The patch which he submitted (which removed the /4 from the index calculation) simply ensured that these high-indexed entries hit the early exit path of guest_set_pmd(). But you get lots of segfaults in guest userspace as the PMDs aren't being updated. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest: fix __get_vm_area usage.Rusty Russell2008-03-10
| | | | | | | | | | | | | | | Robert Bragg's 5dc331852848a38ca00a2817e5b98a1d0561b116 tightened (ie. fixed) the checking in __get_vm_area, and it broke lguest. lguest should pass the exact "end" it wants, not some random constant (it was possible previously that it would actually get an address different from SWITCHER_ADDR). Also, Fabio Checconi pointed out that we should make sure we're not hitting the fixmap area. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Robert Bragg <robert@sixbynine.org>
* lguest: make sure cpu is initialized before accessing itEugene Teo2008-03-10
| | | | | | | | | If req is LHREQ_INITIALIZE, and the guest has been initialized before (unlikely), it will attempt to access cpu->tsk even though cpu is not yet initialized. Signed-off-by: Eugene Teo <eugeneteo@kernel.sg> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest: accept guest _PAGE_PWT page table entriesAhmed S. Darwish2008-02-09
| | | | | | | | | | | | | | Beginning from commit 4138cc3418f5, ioremap_nocache() sets the _PAGE_PWT flag. Lguest doesn't accept a guest pte with a _PWT flag and reports a "bad page table entry" in that case. Accept guest _PAGE_PWT page table entries. Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* Fix container_of() usageAlexey Dobriyan2008-02-08
| | | | | | | | | | Using "attr" twice is not OK, because it effectively prohibits such container_of() on variables not named "attr". Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* virtio: reset functionRusty Russell2008-02-04
| | | | | | | | | | | | | | | | | | | | | A reset function solves three problems: 1) It allows us to renegotiate features, eg. if we want to upgrade a guest driver without rebooting the guest. 2) It gives us a clean way of shutting down virtqueues: after a reset, we know that the buffers won't be used by the host, and 3) It helps the guest recover from messed-up drivers. So we remove the ->shutdown hook, and the only way we now remove feature bits is via reset. We leave it to the driver to do the reset before it deletes queues: the balloon driver, for example, needs to chat to the host in its remove function. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* virtio: explicit enable_cb/disable_cb rather than callback return.Rusty Russell2008-02-04
| | | | | | | | | | It seems that virtio_net wants to disable callbacks (interrupts) before calling netif_rx_schedule(), so we can't use the return value to do so. Rename "restart" to "cb_enable" and introduce "cb_disable" hook: callback now returns void, rather than a boolean. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* virtio: simplify config mechanism.Rusty Russell2008-02-04
| | | | | | | | | | | | | Previously we used a type/len pair within the config space, but this seems overkill. We now simply define a structure which represents the layout in the config space: the config space can now only be extended at the end. The main driver-visible changes: 1) We indicate what fields are present with an explicit feature bit. 2) Virtqueues are explicitly numbered, and not in the config space. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest: fix mis-merge against hpa's TSS renamingRusty Russell2008-01-31
| | | | | | | | drivers/lguest/x86/core.c: In function ‘copy_in_guest_info’: drivers/lguest/x86/core.c:97: error: ‘struct x86_hw_tss’ has no member named ‘esp1’ Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linusLinus Torvalds2008-01-30
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: (27 commits) lguest: use __PAGE_KERNEL instead of _PAGE_KERNEL lguest: Use explicit includes rateher than indirect lguest: get rid of lg variable assignments lguest: change gpte_addr header lguest: move changed bitmap to lg_cpu lguest: move last_pages to lg_cpu lguest: change last_guest to last_cpu lguest: change spte_addr header lguest: per-vcpu lguest pgdir management lguest: make pending notifications per-vcpu lguest: makes special fields be per-vcpu lguest: per-vcpu lguest task management lguest: replace lguest_arch with lg_cpu_arch. lguest: make registers per-vcpu lguest: make emulate_insn receive a vcpu struct. lguest: map_switcher_in_guest() per-vcpu lguest: per-vcpu interrupt processing. lguest: per-vcpu lguest timers lguest: make hypercalls use the vcpu struct lguest: make write() operation smp aware ... Manual conflict resolved (maybe even correctly, who knows) in drivers/lguest/x86/core.c
| * lguest: use __PAGE_KERNEL instead of _PAGE_KERNELGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | x86_64 don't expose the intermediate representation with one underline, _PAGE_KERNEL, just the double-underlined one. Use it, to get a common ground between 32 and 64-bit Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: Use explicit includes rateher than indirectGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | | | | | explicitly use ktime.h include explicitly use hrtimer.h include explicitly use sched.h include This patch adds headers explicitly to lguest sources file, to avoid depending on them being included somewhere else. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: get rid of lg variable assignmentsGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | We can save some lines of code by getting rid of *lg = cpu... lines of code spread everywhere by now. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: change gpte_addr headerGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | gpte_addr() does not depend on any guest information. So we wipe out the lg parameter from it completely. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: move changed bitmap to lg_cpuGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | events represented in the 'changed' bitmap are per-cpu, not per-guest. move it to the lg_cpu structure Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: move last_pages to lg_cpuGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | in our new model, pages are assigned to a virtual cpu, not to a guest. We move it to the lg_cpu structure. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: change last_guest to last_cpuGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | in our model, a guest does not run in a cpu anymore: a virtual cpu does. So we change last_guest to last_cpu Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: change spte_addr headerGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | spte_addr does not depend on any guest information, so we wipe out the lg parameter completely. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: per-vcpu lguest pgdir managementGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | | | this patch makes the pgdir management per-vcpu. The pgdirs pool is still guest-wide (although it'll probably need to grow when we are really executing more vcpus), but the pgdidx index is gone, since it makes no sense anymore. Instead, we use a per-vcpu index. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: make pending notifications per-vcpuGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | this patch makes the pending_notify field, used to control pending notifications, per-vcpu, instead of per-guest Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: makes special fields be per-vcpuGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | lguest struct have room for some fields, namely, cr2, ts, esp1 and ss1, that are not really guest-wide, but rather, vcpu-wide. This patch puts it in the vcpu struct Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: per-vcpu lguest task managementGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | lguest uses tasks to control its running behaviour (like sending breaks, controlling halted state, etc). In a per-vcpu environment, each vcpu will have its own underlying task. So this patch makes the infrastructure for that possible Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: replace lguest_arch with lg_cpu_arch.Glauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | | | | | The fields found in lguest_arch are not really per-guest, but per-cpu (gdt, idt, etc). So this patch turns lguest_arch into lg_cpu_arch. It makes sense to have a per-guest per-arch struct, but this can be addressed later, when the need arrives. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: make registers per-vcpuGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | This is the most obvious per-vcpu field: registers. So this patch moves it from struct lguest to struct vcpu, and patch the places in which they are used, accordingly Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: make emulate_insn receive a vcpu struct.Glauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | emulate_insn() needs to know about current eip, which will be, in the future, a per-vcpu thing. So in this patch, the function prototype is modified to receive a vcpu struct Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: map_switcher_in_guest() per-vcpuGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | | | The switcher needs to be mapped per-vcpu, because different vcpus will potentially have different page tables (they don't have to, because threads will share the same). So our first step is the make the function receive a vcpu struct Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: per-vcpu interrupt processing.Glauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | This patch adapts interrupt processing for using the vcpu struct. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: per-vcpu lguest timersGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | Here, I introduce per-vcpu timers. With this, we can have local expiries, needed for accounting time in smp guests Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: make hypercalls use the vcpu structGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | this patch changes do_hcall() and do_async_hcall() interfaces (and obviously their callers) to get a vcpu struct. Again, a vcpu services the hypercall, not the whole guest Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: make write() operation smp awareGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | This patch makes the write() file operation smp aware. Which means, receiving the vcpu_id value through the offset parameter, and being well aware to which vcpu we're talking to. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: per-cpu run guestGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | This patch makes the run_guest() routine use the lg_cpu struct. This is required since in a smp guest environment, there's no more the notion of "running the guest", but rather, it is "running the vcpu" Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: initialize vcpuGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | this patch initializes the first vcpu in the initialize() routing, which is responsible for starting the process of putting the guest up. right now, as much of the fields are still not per-vcpu, it does not do much. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: introduce vcpu structGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | this patch introduces a vcpu struct for lguest. In upcoming patches, more and more fields will be moved from the lguest struct to the vcpu Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: Reboot supportBalaji Rao2008-01-30
| | | | | | | | | | | | | | | | | | Reboot Implemented (Prevent fd leak, fix style and fix documentation --RR) Signed-off-by: Balaji Rao <balajirrao@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * lguest: remove pv_info dependencyGlauber de Oliveira Costa2008-01-30
| | | | | | | | | | | | | | | | | | | | | | | | Currently, lguest module can't be compiled without the PARAVIRT flag being on. This is a fake dependency, since the module itself shouldn't need any paravirt override. Reason for that is the reference to pv_info structure in initial loading tests. This patch removes it in favour of a more generic error message. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* | x86: use generic register name in the thread and tss structuresH. Peter Anvin2008-01-30
|/ | | | | | | | | This changes size-specific register names (eip/rip, esp/rsp, etc.) to generic names in the thread and tss structures. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()Gautham R Shenoy2008-01-25
| | | | | | | | | | | | | | | | | Replace all lock_cpu_hotplug/unlock_cpu_hotplug from the kernel and use get_online_cpus and put_online_cpus instead as it highlights the refcount semantics in these operations. The new API guarantees protection against the cpu-hotplug operation, but it doesn't guarantee serialized access to any of the local data structures. Hence the changes needs to be reviewed. In case of pseries_add_processor/pseries_remove_processor, use cpu_maps_update_begin()/cpu_maps_update_done() as we're modifying the cpu_present_map there. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Remove bogus duplicate CONFIG_LGUEST_GUEST entry.Rusty Russell2008-01-20
| | | | | | | | | It was moved to arch/x86/lguest/Kconfig, but I lost the deletion part in a patch suffle. My confused one-liner "fix" to turn it on is also reverted: 84f7466ee20cc094aa38617abfa2f3834871f054 Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Selecting LGUEST should turn on Guest support, as in 2.6.23.Rusty Russell2008-01-18
| | | | | | | | | | | | | There's currently no way to turn on Lguest guest support; the planned Kconfig virtualization reorg didn't get into 2.6.25. This was unnoticed because if you already had CONFIG_LGUEST_GUEST=y in your config, it worked. Too bad about new users... Also, the Kconfig help was wrong now the virtio drivers are merged. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* virtio: fix module/device unloadingRusty Russell2007-11-18
| | | | | | | | | | | The virtio code never hooked through the ->remove callback. Although noone supports device removal at the moment, this code is already needed for module unloading. This of course also revealed bugs in virtio_blk, virtio_net and lguest unloading paths. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest_user.c: fix memory leakAdrian Bunk2007-11-14
| | | | | | | | | This patch fixes a memory leak spotted by the Coverity checker. Signed-off-by: Adrian Bunk <bunk@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* virtio: Force use of power-of-two for descriptor ring sizesRusty Russell2007-11-11
| | | | | | | | | | | | | The virtio descriptor rings of size N-1 were nicely set up to be aligned to an N-byte boundary. But as Anthony Liguori points out, the free-running indices used by virtio require that the sizes be a power of 2, otherwise we get problems on wrap (demonstrated with lguest). So we replace the clever "2^n-1" scheme with a simple "align to page boundary" scheme: this means that all virtio rings take at least two pages, but it's safer than guessing cache alignment. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest: documentation updateRusty Russell2007-10-25
| | | | | | | | Went through the documentation doing typo and content fixes. This patch contains only comment and whitespace changes. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest: remove unused "wake" element from struct lguestRusty Russell2007-10-25
| | | | | Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest: use defines from x86 headers instead of magic numbersRusty Russell2007-10-25
| | | | | Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* generalize lgread_u32/lgwrite_u32.Rusty Russell2007-10-23
| | | | | | | | | | | | | | Jes complains that page table code still uses lgread_u32 even though it now uses general kernel pte types. The best thing to do is to generalize lgread_u32 and lgwrite_u32. This means we lose the efficiency of getuser(). We could potentially regain it if we used __copy_from_user instead of copy_from_user, but I'm not certain that our range check is equivalent to access_ok() on all platforms. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Jes Sorensen <jes@sgi.com>
* Lguest support for VirtioRusty Russell2007-10-23
| | | | | | | | | | | | | | | | | | This makes lguest able to use the virtio devices. We change the device descriptor page from a simple array to a variable length "type, config_len, status, config data..." format, and implement virtio_config_ops to read from that config data. We use the virtio ring implementation for an efficient Guest <-> Host virtqueue mechanism, and the new LHCALL_NOTIFY hypercall to kick the host when it changes. We also use LHCALL_NOTIFY on kernel addresses for very very early console output. We could have another hypercall, but this hack works quite well. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Remove old lguest I/O infrrasructure.Rusty Russell2007-10-23
| | | | | | | | | | | This patch gets rid of the old lguest host I/O infrastructure and replaces it with a single hypercall "LHCALL_NOTIFY" which takes an address. The main change is the removal of io.c: that mainly did inter-guest I/O, which virtio doesn't yet support. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Remove old lguest bus and drivers.Rusty Russell2007-10-23
| | | | | | | This gets rid of the lguest bus, drivers and DMA mechanism, to make way for a generic virtio mechanism. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Boot with virtual == physical to get closer to native Linux.Rusty Russell2007-10-23
| | | | | | | | | | | | | | | | | | | | 1) This allows us to get alot closer to booting bzImages. 2) It means we don't have to know page_offset. 3) The Guest needs to modify the boot pagetables to create the PAGE_OFFSET mapping before jumping to C code. 4) guest_pa() walks the page tables rather than using page_offset. 5) We don't use page_offset to figure out whether to emulate: it was always kinda quesationable, and won't work for instructions done before remapping (bzImage unpacking in particular). 6) We still want the kernel address for tlb flushing: have the initial hypercall give us that, too. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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