diff mbox series

[v2,01/15] KVM: arm64: Check if running in VHE from kvm_host_owns_hyp_mappings()

Message ID 20211019121304.2732332-2-qperret@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: pkvm: Implement unshare hypercall | expand

Commit Message

Quentin Perret Oct. 19, 2021, 12:12 p.m. UTC 
The kvm_host_owns_hyp_mappings() function should return true if and only
if the host kernel is responsible for creating the hypervisor stage-1
mappings. That is only possible in standard non-VHE mode, or during boot
in protected nVHE mode. But either way, non of this makes sense in VHE,
so make sure to catch this case as well, hence making the function
return sensible values in any context (VHE or not).

Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
---
 arch/arm64/kvm/mmu.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index da10996dcdf1..0019b2309f70 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -239,6 +239,9 @@  void free_hyp_pgds(void)
 
 static bool kvm_host_owns_hyp_mappings(void)
 {
+	if (is_kernel_in_hyp_mode())
+		return false;
+
 	if (static_branch_likely(&kvm_protected_mode_initialized))
 		return false;