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UPSTREAM: KVM: arm64: Add helpers to tag shared pages in SW bits

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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 <tabba@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210809152448.1810400-13-qperret@google.com
(cherry picked from commit ec250a67ea)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 198418208
Change-Id: Iffc5738d7c8cd8731a976a8bb74c029cc09f9975
This commit is contained in:
Quentin Perret
2021-08-09 16:24:39 +01:00
committed by Will Deacon
parent 39f6e8fc3d
commit 016356a3c4
1 changed files with 26 additions and 0 deletions
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26
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
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@@ -12,6 +12,32 @@
#include <asm/virt.h>
#include <nvhe/spinlock.h>
/*
* 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;