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authorMarc Zyngier <maz@kernel.org>2022-04-05 21:23:25 +0300
committerMarc Zyngier <maz@kernel.org>2022-05-04 16:09:53 +0300
commit94828468a6085e6ae148986d300b634b87f86516 (patch)
tree19535d18cdd87541531d26d985f3bb558524b2ab /include/kvm
parent34453c2e9f799d02f5f379519495208bbd96a935 (diff)
downloadlinux-94828468a6085e6ae148986d300b634b87f86516.tar.xz
KVM: arm64: vgic-v3: Expose GICR_CTLR.RWP when disabling LPIs
When disabling LPIs, a guest needs to poll GICR_CTLR.RWP in order to be sure that the write has taken effect. We so far reported it as 0, as we didn't advertise that LPIs could be turned off the first place. Start tracking this state during which LPIs are being disabled, and expose the 'in progress' state via the RWP bit. We also take this opportunity to disallow enabling LPIs and programming GICR_{PEND,PROP}BASER while LPI disabling is in progress, as allowed by the architecture (UNPRED behaviour). We don't advertise the feature to the guest yet (which is allowed by the architecture). Reviewed-by: Oliver Upton <oupton@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220405182327.205520-3-maz@kernel.org
Diffstat (limited to 'include/kvm')
-rw-r--r--include/kvm/arm_vgic.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index bb30a6803d9f..fdf1c2c322e5 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -347,8 +347,8 @@ struct vgic_cpu {
/* Contains the attributes and gpa of the LPI pending tables. */
u64 pendbaser;
-
- bool lpis_enabled;
+ /* GICR_CTLR.{ENABLE_LPIS,RWP} */
+ atomic_t ctlr;
/* Cache guest priority bits */
u32 num_pri_bits;