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authorMarc Zyngier <marc.zyngier@arm.com>2018-03-06 21:44:37 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2018-03-14 18:31:26 +0000
commit27e91ad1e746e341ca2312f29bccb9736be7b476 (patch)
tree182d51d28baa7ab42884117c37e53b2eebe8675a /virt/kvm
parent16ca6a607d84bef0129698d8d808f501afd08d43 (diff)
downloadop-kernel-dev-27e91ad1e746e341ca2312f29bccb9736be7b476.zip
op-kernel-dev-27e91ad1e746e341ca2312f29bccb9736be7b476.tar.gz
kvm: arm/arm64: vgic-v3: Tighten synchronization for guests using v2 on v3
On guest exit, and when using GICv2 on GICv3, we use a dsb(st) to force synchronization between the memory-mapped guest view and the system-register view that the hypervisor uses. This is incorrect, as the spec calls out the need for "a DSB whose required access type is both loads and stores with any Shareability attribute", while we're only synchronizing stores. We also lack an isb after the dsb to ensure that the latter has actually been executed before we start reading stuff from the sysregs. The fix is pretty easy: turn dsb(st) into dsb(sy), and slap an isb() just after. Cc: stable@vger.kernel.org Fixes: f68d2b1b73cc ("arm64: KVM: Implement vgic-v3 save/restore") Acked-by: Christoffer Dall <cdall@kernel.org> Reviewed-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/arm/hyp/vgic-v3-sr.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c
index f5c3d6d7..b89ce54 100644
--- a/virt/kvm/arm/hyp/vgic-v3-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v3-sr.c
@@ -215,7 +215,8 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
* are now visible to the system register interface.
*/
if (!cpu_if->vgic_sre) {
- dsb(st);
+ dsb(sy);
+ isb();
cpu_if->vgic_vmcr = read_gicreg(ICH_VMCR_EL2);
}
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