[Xen-changelog] [xen stable-4.4] x86/PVH: replace bogus assertion with conditional

[patchbot@xxxxxxx]

commit 184e82513e3a4eb16b92e891d1d0ab719320c0ea
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Nov 13 09:50:13 2014 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Nov 13 09:50:13 2014 +0100

    x86/PVH: replace bogus assertion with conditional
    
    While PVH guests currently have to start in 64-bit mode, nothing keeps
    them from entering compatibility mode via a suitable ring-0 code
    selector and making a hypercall from there. Fail such attempts rather
    than asserting they won't happen.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 01c019c843df313f62ca5c106544026867da9e9e
    master date: 2014-11-04 13:07:23 +0100
---
 xen/arch/x86/hvm/hvm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index b004b74..84efe48 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -3546,10 +3546,10 @@ int hvm_do_hypercall(struct cpu_user_regs *regs)
                                                    regs->r8, regs->r9);
         curr->arch.hvm_vcpu.hcall_64bit = 0;
     }
+    else if ( unlikely(is_pvh_vcpu(curr)) )
+        regs->_eax = -ENOSYS; /* PVH 32bitfixme. */
     else
     {
-        ASSERT(!is_pvh_vcpu(curr));   /* PVH 32bitfixme. */
-
         HVM_DBG_LOG(DBG_LEVEL_HCALL, "hcall%u(%x, %x, %x, %x, %x, %x)", eax,
                     (uint32_t)regs->ebx, (uint32_t)regs->ecx,
                     (uint32_t)regs->edx, (uint32_t)regs->esi,
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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