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FROMGIT: KVM: arm64: Extend pkvm_page_state enumeration to handle absent pages

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Explicitly name the combination of SW0 | SW1 as reserved in the pte and
introduce a new PKVM_NOPAGE meta-state which, although not directly
stored in the software bits of the pte, can be used to represent an
entry for which there is no underlying page. This is distinct from an
invalid pte, as stage-2 identity mappings for the host are created
lazily and so an invalid pte there is the same as a valid mapping for
the purposes of ownership information.

This state will be used for permission checking during page transitions
in later patches.

Reviewed-by: Andrew Walbran <qwandor@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211215161232.1480836-9-qperret@google.com
(cherry picked from commit 3d467f7b8c
 git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next)
Bug: 209599700
Change-Id: I2e803a6ae83694be178a3d3eaf75fe918c881659
This commit is contained in:
Will Deacon
2021-12-15 16:12:25 +00:00
committed by Quentin Perret
parent 61936dc510
commit d9acb48aed
1 changed files with 5 additions and 0 deletions
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5
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
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@@ -24,6 +24,11 @@ enum pkvm_page_state {
PKVM_PAGE_OWNED = 0ULL,
PKVM_PAGE_SHARED_OWNED = KVM_PGTABLE_PROT_SW0,
PKVM_PAGE_SHARED_BORROWED = KVM_PGTABLE_PROT_SW1,
__PKVM_PAGE_RESERVED = KVM_PGTABLE_PROT_SW0 |
KVM_PGTABLE_PROT_SW1,
/* Meta-states which aren't encoded directly in the PTE's SW bits */
PKVM_NOPAGE,
};
#define PKVM_PAGE_STATE_PROT_MASK (KVM_PGTABLE_PROT_SW0 | KVM_PGTABLE_PROT_SW1)