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[Xen-devel,v2,10/15] xen/arm: p2m: Don't need to restore the state for an idle vCPU.

Message ID 1469715620-4670-11-git-send-email-julien.grall@arm.com
State New
Headers show

Commit Message

Julien Grall July 28, 2016, 2:20 p.m. UTC 
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@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

---
    Changes in v2:
        - Add Stefano's reviewed-by
---
 xen/arch/arm/p2m.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

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();