[Xen-changelog] [xen stable-4.8] x86/cpu: Don't update this_cpu for get_cpu_vendor(, gcv_guest)

[patchbot@xxxxxxx]

commit daf491dc1e87fe32b35f2ae75b4add0fa96c0d7f
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Jan 18 09:52:19 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jan 18 09:52:19 2017 +0100

    x86/cpu: Don't update this_cpu for get_cpu_vendor(, gcv_guest)
    
    Otherwise booting a cross-vendor guest would cause PCPU hotplug to
    malfunction, because of trying to use the wrong CPU driver.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 291dcb4dd0140fac0e439760b4d51b2892ff9264
    master date: 2017-01-03 13:33:16 +0000
---
 xen/arch/x86/cpu/common.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c
index 1d78ab4..b5da94a 100644
--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -166,7 +166,8 @@ int get_cpu_vendor(const char v[], enum get_cpu_vendor mode)
                        if (!strcmp(v,cpu_devs[i]->c_ident[0]) ||
                            (cpu_devs[i]->c_ident[1] && 
                             !strcmp(v,cpu_devs[i]->c_ident[1]))) {
-                               this_cpu = cpu_devs[i];
+                               if (mode == gcv_host)
+                                       this_cpu = cpu_devs[i];
                                return i;
                        }
                }
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.8

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