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KVM: arm64: Use 0b11 for encoding PKVM_NOPAGE

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The page ownership state encoded as 0b11 is currently considered
reserved for future use, and PKVM_NOPAGE uses bit 2. In order to
simplify the relocation of the hyp ownership state into the
vmemmap in later patches, let's use the 'reserved' encoding for
the PKVM_NOPAGE state. The struct hyp_page layout isn't guaranteed
stable at all, so there is no real reason to have 'reserved' encodings.

No functional changes intended.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20250416152648.2982950-4-qperret@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Quentin Perret
2025-04-16 15:26:43 +00:00
committed by Marc Zyngier
parent ba637018ca
commit cd4b039165
1 changed files with 1 additions and 3 deletions
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4
arch/arm64/kvm/hyp/include/nvhe/memory.h
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@@ -23,7 +23,6 @@ enum pkvm_page_state {
PKVM_PAGE_OWNED = 0ULL,
PKVM_PAGE_SHARED_OWNED = BIT(0),
PKVM_PAGE_SHARED_BORROWED = BIT(1),
__PKVM_PAGE_RESERVED = BIT(0) | BIT(1),
/*
* 'Meta-states' are not stored directly in PTE SW bits for hyp and
@@ -31,9 +30,8 @@ enum pkvm_page_state {
* entries). For the host, meta-states are stored directly in the
* struct hyp_page.
*/
PKVM_NOPAGE = BIT(2),
PKVM_NOPAGE = BIT(0) | BIT(1),
};
#define PKVM_PAGE_META_STATES_MASK (~__PKVM_PAGE_RESERVED)
#define PKVM_PAGE_STATE_PROT_MASK (KVM_PGTABLE_PROT_SW0 | KVM_PGTABLE_PROT_SW1)
static inline enum kvm_pgtable_prot pkvm_mkstate(enum kvm_pgtable_prot prot,