The patch below does not apply to the 4.11-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 02d50cdaff36c135d222015cffdca3ff11d168ea Mon Sep 17 00:00:00 2001
From: Hu Huajun <huhuajun@xxxxxxxxxx>
Date: Mon, 12 Jun 2017 22:37:48 +0800
Subject: [PATCH] KVM: ARM64: fix phy counter access failure in guest.
When reading the cntpct_el0 in guest with VHE (Virtual Host Extension)
enabled in host, the "Unsupported guest sys_reg access" error reported.
The reason is cnthctl_el2.EL1PCTEN is not enabled, which is expected
to be done in kvm_timer_init_vhe(). The problem is kvm_timer_init_vhe
is called by cpu_init_hyp_mode, and which is called when VHE is disabled.
This patch remove the incorrect call to kvm_timer_init_vhe() from
cpu_init_hyp_mode(), and calls kvm_timer_init_vhe() to enable
cnthctl_el2.EL1PCTEN in cpu_hyp_reinit().
Fixes: 488f94d7212b ("KVM: arm64: Access CNTHCTL_EL2 bit fields correctly on VHE systems")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Hu Huajun <huhuajun@xxxxxxxxxx>
Reviewed-by: Christoffer Dall <cdall@xxxxxxxxxx>
Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Christoffer Dall <cdall@xxxxxxxxxx>
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index a265acc53e39..a39a1e161e63 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -1141,9 +1141,6 @@ static void cpu_init_hyp_mode(void *dummy)
__cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
__cpu_init_stage2();
- if (is_kernel_in_hyp_mode())
- kvm_timer_init_vhe();
-
kvm_arm_init_debug();
}
@@ -1163,6 +1160,7 @@ static void cpu_hyp_reinit(void)
* event was cancelled before the CPU was reset.
*/
__cpu_init_stage2();
+ kvm_timer_init_vhe();
} else {
cpu_init_hyp_mode(NULL);
}