[Xen-changelog] [xen master] x86/pv: Support do_set_segment_base() for compat guests

[patchbot@xxxxxxx]

commit c99986fa168ef79b1ea6c071f57017e40b367383
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Jul 15 13:12:01 2016 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Sep 6 13:33:44 2016 +0100

    x86/pv: Support do_set_segment_base() for compat guests
    
    set_segment_base is the only hypercall exists in only one of the two modes
    guests might run in; all other hypercalls are either implemented, or
    unimplemented in both modes.
    
    Remove this split, by allowing do_set_segment_base() to be called in the
    compat hypercall path.  This change will simplify the verification logic in 
a
    later change.
    
    No behavioural change from a guests point of view.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/x86_64/compat/entry.S | 2 +-
 xen/arch/x86/x86_64/mm.c           | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/x86_64/compat/entry.S 
b/xen/arch/x86/x86_64/compat/entry.S
index e80c53c..1b6a482 100644
--- a/xen/arch/x86/x86_64/compat/entry.S
+++ b/xen/arch/x86/x86_64/compat/entry.S
@@ -456,7 +456,7 @@ ENTRY(compat_hypercall_table)
         .quad compat_update_va_mapping_otherdomain
         .quad compat_iret
         .quad compat_vcpu_op
-        .quad compat_ni_hypercall       /* 25 */
+        .quad do_set_segment_base       /* 25 */
         .quad compat_mmuext_op
         .quad compat_xsm_op
         .quad compat_nmi_op
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index 7f858fb..250d3e0 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -1031,6 +1031,9 @@ long do_set_segment_base(unsigned int which, unsigned 
long base)
     struct vcpu *v = current;
     long ret = 0;
 
+    if ( is_pv_32bit_vcpu(v) )
+        return -ENOSYS; /* x86/64 only. */
+
     switch ( which )
     {
     case SEGBASE_FS:
--
generated by git-patchbot for /home/xen/git/xen.git#master

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