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author | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-22 03:03:30 +0200 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 07:49:52 +0200 |
commit | cc6d4fbcef328acdc9fa7023e69f39f753f72fe1 (patch) | |
tree | 860672e7da1a3516e36dd40f962552451ef0bcf2 /arch/x86 | |
parent | Reorder guest saved regs to match hyperall order (diff) | |
download | linux-cc6d4fbcef328acdc9fa7023e69f39f753f72fe1.tar.xz linux-cc6d4fbcef328acdc9fa7023e69f39f753f72fe1.zip |
Introduce "hcall" pointer to indicate pending hypercall.
Currently we look at the "trapnum" to see if the Guest wants a
hypercall. But once the hypercall is done we have to reset trapnum to
a bogus value, otherwise if we exit to userspace and return, we'd run
the same hypercall twice (that was a nasty bug to find!).
This has two main effects:
1) When Jes's patch changes the hypercall args to be a generic "struct
hcall_args" we simply change the type of "lg->hcall". It's set by
arch code, so if it has to copy args or something it can do so, and
point "hcall" into lg->arch somewhere.
2) Async hypercalls only get run when an actual hypercall is pending.
This simplfies the code a little and is a more logical semantic.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'arch/x86')
0 files changed, 0 insertions, 0 deletions