22 Jul, 2011
1 commit
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Also removes a long-unused #define and an extraneous semicolon.
Signed-off-by: Rusty Russell
14 Apr, 2010
1 commit
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This is a partial revert of 4cd8b5e2a159 "lguest: use KVM hypercalls";
we revert to using (just as questionable but more reliable) int $15 for
hypercalls. I didn't revert the register mapping, so we still use the
same calling convention as kvm.KVM in more recent incarnations stopped injecting a fault when a guest
tried to use the VMCALL instruction from ring 1, so lguest under kvm
fails to make hypercalls. It was nice to share code with our KVM
cousins, but this was overreach.Signed-off-by: Rusty Russell
Cc: Matias Zabaljauregui
Cc: Avi Kivity
30 Jul, 2009
2 commits
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Every so often, after code shuffles, I need to go through and unbitrot
the Lguest Journey (see drivers/lguest/README). Since we now use RCU in
a simple form in one place I took the opportunity to expand that explanation.Signed-off-by: Rusty Russell
Cc: Ingo Molnar
Cc: Paul McKenney -
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: Rusty Russell
Cc: Ingo Molnar
17 Jul, 2009
1 commit
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fix: "make Guest" was complaining about duplicated G:032
Signed-off-by: Matias Zabaljauregui
Signed-off-by: Rusty Russell
12 Jun, 2009
4 commits
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This version requires that host and guest have the same PAE status.
NX cap is not offered to the guest, yet.Signed-off-by: Matias Zabaljauregui
Signed-off-by: Rusty Russell -
Add support for kvm_hypercall4(); PAE wants it.
Signed-off-by: Matias Zabaljauregui
Signed-off-by: Rusty Russell -
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: Matias Zabaljauregui
Signed-off-by: Rusty Russell
Reported-by: Jeremy Fitzhardinge -
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 secondsAfter:
1GB tcpblast Guest->Host: 6.8 seconds
1GB tcpblast Guest->Host (no GSO): 27.8 secondsSigned-off-by: Rusty Russell
19 Apr, 2009
1 commit
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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: Rusty Russell
Cc: lguest@ozlabs.org
30 Mar, 2009
1 commit
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Impact: cleanup
This patch allow us to use KVM hypercalls
Signed-off-by: Matias Zabaljauregui
Signed-off-by: Rusty Russell
23 Oct, 2008
2 commits
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Change header guards named "ASM_X86__*" to "_ASM_X86_*" since:
a. the double underscore is ugly and pointless.
b. no leading underscore violates namespace constraints.Signed-off-by: H. Peter Anvin
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Signed-off-by: Al Viro
Signed-off-by: H. Peter Anvin
