This is a note to let you know that I've just added the patch titled
KVM: ARM64: fix phy counter access failure in guest.
to the 4.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-arm64-fix-phy-counter-access-failure-in-guest.patch
and it can be found in the queue-4.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 02d50cdaff36c135d222015cffdca3ff11d168ea Mon Sep 17 00:00:00 2001
From: Hu Huajun <huhuajun@xxxxxxxxxx>
Date: Mon, 12 Jun 2017 22:37:48 +0800
Subject: KVM: ARM64: fix phy counter access failure in guest.
From: Hu Huajun <huhuajun@xxxxxxxxxx>
commit 02d50cdaff36c135d222015cffdca3ff11d168ea upstream.
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")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
virt/kvm/arm/arm.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -1115,9 +1115,6 @@ static void cpu_init_hyp_mode(void *dumm
__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();
}
@@ -1137,6 +1134,7 @@ 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);
}
Patches currently in stable-queue which might be from huhuajun@xxxxxxxxxx are
queue-4.12/kvm-arm64-fix-phy-counter-access-failure-in-guest.patch