[Xen-devel] [PATCH 6/6] xen: arm: Ensure HCR_EL2.RW is set correctly when building dom0

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

copy_to_user and friends rely on this, since the address transalation
functions (guest VA -> MFN) will truncate VA to the appropriate size.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index fb1fa56..e3ea3f0 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -875,6 +875,13 @@ int construct_dom0(struct domain *d)
 
     /* The following loads use the domain's p2m */
     p2m_load_VTTBR(d);
+#ifdef CONFIG_ARM_64
+    d->arch.type = kinfo.type;
+    if ( is_pv32_domain(d) )
+        WRITE_SYSREG(READ_SYSREG(HCR_EL2) & ~HCR_RW, HCR_EL2);
+    else
+        WRITE_SYSREG(READ_SYSREG(HCR_EL2) | HCR_RW, HCR_EL2);
+#endif
 
     kernel_load(&kinfo);
     dtb_load(&kinfo);
@@ -888,9 +895,6 @@ int construct_dom0(struct domain *d)
 
     regs->pc = (register_t)kinfo.entry;
 
-#ifdef CONFIG_ARM_64
-    d->arch.type = kinfo.type;
-#endif
 
     if ( is_pv32_domain(d) )
     {
-- 
1.7.10.4


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