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| author | Rusty Russell <rusty@rustcorp.com.au> | 2010-04-15 03:43:54 (GMT) |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2010-04-14 12:13:56 (GMT) |
| commit | 091ebf07a2408f9a56634caa0f86d9360e9af23b (patch) | |
| tree | 62d3b3424cc1c0dc71b3b750bb1e8e063e658fd3 /arch/x86/lguest/i386_head.S | |
| parent | 5094aeafbbd500509f648e3cd102b053bc7926b3 (diff) | |
| download | linux-091ebf07a2408f9a56634caa0f86d9360e9af23b.tar.xz | |
lguest: stop using KVM hypercall mechanism
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 <rusty@rustcorp.com.au>
Cc: Matias Zabaljauregui <zabaljauregui@gmail.com>
Cc: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/lguest/i386_head.S')
| -rw-r--r-- | arch/x86/lguest/i386_head.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/lguest/i386_head.S b/arch/x86/lguest/i386_head.S index 27eac0f..4f420c2f 100644 --- a/arch/x86/lguest/i386_head.S +++ b/arch/x86/lguest/i386_head.S @@ -32,7 +32,7 @@ ENTRY(lguest_entry) */ movl $LHCALL_LGUEST_INIT, %eax movl $lguest_data - __PAGE_OFFSET, %ebx - .byte 0x0f,0x01,0xc1 /* KVM_HYPERCALL */ + int $LGUEST_TRAP_ENTRY /* Set up the initial stack so we can run C code. */ movl $(init_thread_union+THREAD_SIZE),%esp |