06 Feb, 2009
1 commit
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Make the following style cleanups:
* drop unnecessary //#include from xen-asm_32.S
* compulsive adding of space after comma
* reformat multiline commentsSigned-off-by: Tejun Heo
Signed-off-by: Ingo Molnar
05 Feb, 2009
1 commit
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Now that x86-64 has directly accessible percpu variables, it can also
implement the direct versions of these operations, which operate on a
vcpu_info structure directly embedded in the percpu area.In fact, the 64-bit versions are more or less identical, and so can be
shared. The only two differences are:
1. xen_restore_fl_direct takes its argument in eax on 32-bit, and rdi on 64-bit.
Unfortunately it isn't possible to directly refer to the 2nd lsb of rdi directly
(as you can with %ah), so the code isn't quite as dense.
2. check_events needs to variants to save different registers.Signed-off-by: Jeremy Fitzhardinge
Signed-off-by: H. Peter Anvin
16 Jul, 2008
1 commit
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Split xen-asm into 32- and 64-bit files, and implement the 64-bit
variants.Signed-off-by: Jeremy Fitzhardinge
Cc: Stephen Tweedie
Cc: Eduardo Habkost
Cc: Mark McLoughlin
Signed-off-by: Ingo Molnar
25 Apr, 2008
4 commits
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xen_sysexit and xen_iret were doing essentially the same thing. Rather
than having a separate implementation for xen_sysexit, we can just strip
the stack back to an iret frame and jump into xen_iret. This removes
a lot of code and complexity - specifically, another critical region.Signed-off-by: Jeremy Fitzhardinge
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
Use jmp rather than call for the iret fixup, so its consistent with
the sysexit fixup, and it simplifies the stack (which is already
complex).Signed-off-by: Jeremy Fitzhardinge
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
64-bit Xen supports sysenter for 32-bit guests, so support its
use. (sysenter is faster than int $0x80 in 32-on-64.)sysexit is still not supported, so we fake it up using iret.
Signed-off-by: Jeremy Fitzhardinge
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
Signed-off-by: Jeremy Fitzhardinge
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner
17 Apr, 2008
1 commit
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Change iret implementation to not be dependent on direct-access vcpu
structure.Signed-off-by: Jeremy Fitzhardinge
Signed-off-by: Ingo Molnar
27 Mar, 2008
1 commit
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xen_irq_enable_direct and xen_sysexit were using "andw $0x00ff,
XEN_vcpu_info_pending(vcpu)" to unmask events and test for pending ones
in one instuction.Unfortunately, the pending flag must be modified with a locked operation
since it can be set by another CPU, and the unlocked form of this
operation was causing the pending flag to get lost, allowing the processor
to return to usermode with pending events and ultimately deadlock.The simple fix would be to make it a locked operation, but that's rather
costly and unnecessary. The fix here is to split the mask-clearing and
pending-testing into two instructions; the interrupt window between
them is of no concern because either way pending or new events will
be processed.This should fix lingering bugs in using direct vcpu structure access too.
[ Stable: needed in 2.6.24.x ]
Signed-off-by: Jeremy Fitzhardinge
Cc: Stable
Signed-off-by: Ingo Molnar
11 Oct, 2007
1 commit
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Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar
