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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org We will soon start annotating shared pages in page-tables in nVHE protected mode. Define all the states in which a page can be (owned, shared and owned, shared and borrowed), and provide helpers allowing to convert this into SW bits annotations using the matching prot attributes. Reviewed-by: Fuad Tabba Signed-off-by: Quentin Perret --- arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h index 9c227d87c36d..87b1690c439f 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -12,6 +12,32 @@ #include #include +/* + * SW bits 0-1 are reserved to track the memory ownership state of each page: + * 00: The page is owned exclusively by the page-table owner. + * 01: The page is owned by the page-table owner, but is shared + * with another entity. + * 10: The page is shared with, but not owned by the page-table owner. + * 11: Reserved for future use (lending). + */ +enum pkvm_page_state { + PKVM_PAGE_OWNED = 0ULL, + PKVM_PAGE_SHARED_OWNED = KVM_PGTABLE_PROT_SW0, + PKVM_PAGE_SHARED_BORROWED = KVM_PGTABLE_PROT_SW1, +}; + +#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, + enum pkvm_page_state state) +{ + return (prot & ~PKVM_PAGE_STATE_PROT_MASK) | state; +} + +static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot) +{ + return prot & PKVM_PAGE_STATE_PROT_MASK; +} + struct host_kvm { struct kvm_arch arch; struct kvm_pgtable pgt; -- 2.32.0.605.g8dce9f2422-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel