[Xen-changelog] [xen master] xen/arm: p2m: Don't need to restore the state for an idle vCPU.

[patchbot@xxxxxxx]

commit cfd7f424ebe40a5efa49efddd88859b0fb1d5abe
Author:     Julien Grall <julien.grall@xxxxxxx>
AuthorDate: Thu Jul 28 15:20:15 2016 +0100
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Thu Jul 28 17:42:21 2016 -0700

    xen/arm: p2m: Don't need to restore the state for an idle vCPU.
    
    The function p2m_restore_state could be called with an idle vCPU in
    arguments (when called by construct_dom0). However, we will never return
    to EL0/EL1 in this case, so it is not necessary to restore the p2m
    registers.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/p2m.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 7e524fe..aff5906 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -127,6 +127,9 @@ void p2m_restore_state(struct vcpu *n)
 {
     register_t hcr;
 
+    if ( is_idle_vcpu(n) )
+        return;
+
     hcr = READ_SYSREG(HCR_EL2);
     WRITE_SYSREG(hcr & ~HCR_VM, HCR_EL2);
     isb();
--
generated by git-patchbot for /home/xen/git/xen.git#master

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