[Xen-changelog] [xen stable-4.7] Don't clear HCR_VM bit when updating VTTBR.

[patchbot@xxxxxxx]

commit d166f07e0e3c607f6c991fce10ea5198cb6addc4
Author:     Jun Sun <jsun@xxxxxxxxxx>
AuthorDate: Mon Oct 10 12:27:56 2016 -0700
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Fri Mar 17 12:06:34 2017 -0700

    Don't clear HCR_VM bit when updating VTTBR.
    
    Currently function p2m_restore_state() would clear HCR_VM bit, i.e.,
    disabling stage2 translation, before updating VTTBR register. After
    some research and talking to ARM support, I got confirmed that this is not
    necessary. We are currently working on a new platform that would need this
    to be removed.
    
    The patch is tested on FVP foundation model.
    
    Signed-off-by: Jun Sun <jsun@xxxxxxxxxx>
    Acked-by: Steve Capper <steve.capper@xxxxxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/p2m.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 6a19c57..f0169aa 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -98,8 +98,6 @@ void p2m_restore_state(struct vcpu *n)
     register_t hcr;
 
     hcr = READ_SYSREG(HCR_EL2);
-    WRITE_SYSREG(hcr & ~HCR_VM, HCR_EL2);
-    isb();
 
     p2m_load_VTTBR(n->domain);
     isb();
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.7

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