[Xen-changelog] [xen stable-4.8] x86/pv: Align %rsp before pushing the failsafe stack frame

[patchbot@xxxxxxx]

commit 173eb9319571e2ae787984c7883e6be617d3b266
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Jun 9 13:36:08 2017 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Jun 9 13:36:08 2017 +0200

    x86/pv: Align %rsp before pushing the failsafe stack frame
    
    Architecturally, all 64bit stacks are aligned on a 16 byte boundary before 
an
    exception frame is pushed.  The failsafe frame should not special in this
    regard.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: cbcaccb5e991155a4ae85a032e990614c3dc6960
    master date: 2017-05-09 19:00:20 +0100
---
 xen/arch/x86/domain.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 093856a..7b4e5e5 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1761,9 +1761,8 @@ static void load_segments(struct vcpu *n)
         struct pv_vcpu *pv = &n->arch.pv_vcpu;
         struct cpu_user_regs *regs = guest_cpu_user_regs();
         unsigned long *rsp =
-            (n->arch.flags & TF_kernel_mode) ?
-            (unsigned long *)regs->rsp :
-            (unsigned long *)pv->kernel_sp;
+            (unsigned long *)(((n->arch.flags & TF_kernel_mode)
+                               ? regs->rsp : pv->kernel_sp) & ~0xf);
         unsigned long cs_and_mask, rflags;
 
         /* Fold upcall mask and architectural IOPL into RFLAGS.IF. */
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.8

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