Hi Quentin,
On 2021/6/2 18:43, Quentin Perret wrote:
Hi Yanan,
On Thursday 15 Apr 2021 at 19:50:27 (+0800), Yanan Wang wrote:
diff --git a/arch/arm64/include/asm/kvm_pgtable.h
b/arch/arm64/include/asm/kvm_pgtable.h
index c3674c47d48c..a43cbe697b37 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -61,10 +61,12 @@ struct kvm_pgtable_mm_ops {
* @KVM_PGTABLE_S2_NOFWB: Don't enforce Normal-WB even if the CPUs have
* ARM64_HAS_STAGE2_FWB.
* @KVM_PGTABLE_S2_IDMAP: Only use identity mappings.
+ * @KVM_PGTABLE_S2_GUEST: Whether the page-tables are guest stage-2.
*/
enum kvm_pgtable_stage2_flags {
KVM_PGTABLE_S2_NOFWB = BIT(0),
KVM_PGTABLE_S2_IDMAP = BIT(1),
+ KVM_PGTABLE_S2_GUEST = BIT(2),
Assuming that we need this flag (maybe not given Marc's suggestion on
another patch), I'd recommend re-naming it to explain _what_ it does,
rather than _who_ is using it.
I agree with this.
That's the principle we followed for e.g. KVM_PGTABLE_S2_IDMAP, so we
should be consistent here as well.
But I think maybe we don't need the new flag anymore with Marc's suggestion.
Currently the CMOs right before installation or update of a PTE are
guest-specific.
So if we also take the new optional callbacks as guest specific, then a
new flag is
not necessary because we can check whether the callbacks have been
initialized
to determine if we are managing a guest S2 PTE.
Thanks,
Yanan
Thanks,
Quentin
.
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