- 30 7月, 2009 2 次提交
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由 Rusty Russell 提交于
I've been doing this for years, and akpm picked me up on it about 12 months ago. lguest partly serves as example code, so let's do it Right. Also, remove two unused fields in struct vblk_info in the example launcher. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Cc: Ingo Molnar <mingo@redhat.com>
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由 Rusty Russell 提交于
I don't really notice it (except to begrudge the extra vertical space), but Ingo does. And he pointed out that one excuse of lguest is as a teaching tool, it should set a good example. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Cc: Ingo Molnar <mingo@redhat.com>
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- 17 7月, 2009 1 次提交
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由 Davide Libenzi 提交于
While fixing lg.h to drop the fwd declaration, I noticed there's another one ;) Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 01 7月, 2009 1 次提交
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由 Davide Libenzi 提交于
Change the eventfd interface to de-couple the eventfd memory context, from the file pointer instance. Without such change, there is no clean way to racely free handle the POLLHUP event sent when the last instance of the file* goes away. Also, now the internal eventfd APIs are using the eventfd context instead of the file*. This patch is required by KVM's IRQfd code, which is still under development. Signed-off-by: NDavide Libenzi <davidel@xmailserver.org> Cc: Gregory Haskins <ghaskins@novell.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: Avi Kivity <avi@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 12 6月, 2009 8 次提交
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由 Rusty Russell 提交于
We no longer need an efficient mechanism to force the Guest back into host userspace, as each device is serviced without bothering the main Guest process (aka. the Launcher). Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
Currently, when a Guest wants to perform I/O it calls LHCALL_NOTIFY with an address: the main Launcher process returns with this address, and figures out what device to run. A far nicer model is to let processes bind an eventfd to an address: if we find one, we simply signal the eventfd. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Cc: Davide Libenzi <davidel@xmailserver.org>
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由 Rusty Russell 提交于
We currently only allow the Launcher process to send interrupts, but it as we already send interrupts from the hrtimer, it's a simple matter of extracting that code into a common set_interrupt routine. As we switch to a thread per virtqueue, this avoids a bottleneck through the main Launcher process. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Matias Zabaljauregui 提交于
This version requires that host and guest have the same PAE status. NX cap is not offered to the guest, yet. Signed-off-by: NMatias Zabaljauregui <zabaljauregui@gmail.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Matias Zabaljauregui 提交于
replace LHCALL_SET_PMD with LHCALL_SET_PGD hypercall name (That's really what it is, and the confusion gets worse with PAE support) Signed-off-by: NMatias Zabaljauregui <zabaljauregui@gmail.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Reported-by: NJeremy Fitzhardinge <jeremy@goop.org>
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由 Matias Zabaljauregui 提交于
If GDT_ENTRIES were every > 256, this could become a problem. Signed-off-by: Matias Zabaljauregui <zabaljauregui at gmail.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
lguest never checked for pending interrupts when enabling interrupts, and things still worked. However, it makes a significant difference to TCP performance, so it's time we fixed it by introducing a pending_irq flag and checking it on irq_restore and irq_enable. These two routines are now too big to patch into the 8/10 bytes patch space, so we drop that code. Note: The high latency on interrupt delivery had a very curious effect: once everything else was optimized, networking without GSO was faster than networking with GSO, since more interrupts were sent and hence a greater chance of one getting through to the Guest! Note2: (Almost) Closing the same loophole for iret doesn't have any measurable effect, so I'm leaving that patch for the moment. Before: 1GB tcpblast Guest->Host: 30.7 seconds 1GB tcpblast Guest->Host (no GSO): 76.0 seconds After: 1GB tcpblast Guest->Host: 6.8 seconds 1GB tcpblast Guest->Host (no GSO): 27.8 seconds Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
When the Guest does the LHCALL_HALT hypercall, we go to sleep, expecting that a timer or the Waker will wake_up_process() us. But we do it in a stupid way, leaving a classic missing wakeup race. So split maybe_do_interrupt() into interrupt_pending() and try_deliver_interrupt(), and check maybe_do_interrupt() and the "break_out" flag before calling schedule. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 19 4月, 2009 1 次提交
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由 Rusty Russell 提交于
Fixes guest crash 'lguest: bad read address 0x4800000 len 256' The new per-cpu allocator ends up handing a non-linear address to write_gdt_entry. We do __pa() on it, and hand it to the host, which kills us. I've long wanted to make the hypercall "LOAD_GDT_ENTRY" to match the IDT code, but had no pressing reason until now. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Cc: lguest@ozlabs.org
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- 30 3月, 2009 1 次提交
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由 Matias Zabaljauregui 提交于
Impact: clean up Rusty told me, some time ago, that he had become a fan of "bool". So, here are some replacements. Signed-off-by: Matias Zabaljauregui <zabaljauregui at gmail.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 30 12月, 2008 1 次提交
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由 Matias Zabaljauregui 提交于
This patch moves the initial guest page table creation code to the host, so the launcher keeps working with PAE enabled configs. Signed-off-by: NMatias Zabaljauregui <zabaljauregui@gmail.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 27 5月, 2008 1 次提交
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由 Jeremy Fitzhardinge 提交于
Add pte_flags() to extract the flags from a pte. This is a special case of pte_val() which is only guaranteed to return the pte's flags correctly; the page number may be corrupted or missing. The intent is to allow paravirt implementations to return pte flags without having to do any translation of the page number (most notably, Xen). Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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- 19 4月, 2008 1 次提交
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由 Matthew Wilcox 提交于
None of these files use any of the functionality promised by asm/semaphore.h. It's possible that they rely on it dragging in some unrelated header file, but I can't build all these files, so we'll have fix any build failures as they come up. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com>
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- 30 1月, 2008 16 次提交
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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We can save some lines of code by getting rid of *lg = cpu... lines of code spread everywhere by now. Signed-off-by: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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events represented in the 'changed' bitmap are per-cpu, not per-guest. move it to the lg_cpu structure Signed-off-by: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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this patch makes the pending_notify field, used to control pending notifications, per-vcpu, instead of per-guest Signed-off-by: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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This patch adapts interrupt processing for using the vcpu struct. Signed-off-by: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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Here, I introduce per-vcpu timers. With this, we can have local expiries, needed for accounting time in smp guests Signed-off-by: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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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: NGlauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 25 10月, 2007 2 次提交
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由 Rusty Russell 提交于
Went through the documentation doing typo and content fixes. This patch contains only comment and whitespace changes. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 23 10月, 2007 5 次提交
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由 Rusty Russell 提交于
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: NRusty Russell <rusty@rustcorp.com.au> Acked-by: NJes Sorensen <jes@sgi.com>
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由 Rusty Russell 提交于
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: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
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: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
(Based on Ron Minnich's LGUEST_PLAN9_SYSCALL patch). This patch allows Guests to specify what system call vector they want, and we try to reserve it. We only allow one non-Linux system call vector, to try to avoid DoS on the Host. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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