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KVM: arm/arm64: Consolidate page-table accessors 

The arm and arm64 KVM page tables accessors are pointlessly different
between the two architectures, and likely both wrong one way or another:
arm64 lacks a dsb(), and arm doesn't use WRITE_ONCE.

Let's unify them.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2018-05-25 12:23:11 +01:00
parent 2f6ea23f63
commit 88dc25e8ea
3 changed files with 12 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arm/include/asm/kvm_mmu.h
View File

@ -75,18 +75,6 @@ phys_addr_t kvm_get_idmap_vector(void);
int kvm_mmu_init(void);
void kvm_clear_hyp_idmap(void);
static inline void kvm_set_pmd(pmd_t *pmd, pmd_t new_pmd)
{
*pmd = new_pmd;
dsb(ishst);
}
static inline void kvm_set_pte(pte_t *pte, pte_t new_pte)
{
*pte = new_pte;
dsb(ishst);
}
static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
{
pte_val(pte) |= L_PTE_S2_RDWR;

3
arch/arm64/include/asm/kvm_mmu.h
View File

@ -169,9 +169,6 @@ phys_addr_t kvm_get_idmap_vector(void);
int kvm_mmu_init(void);
void kvm_clear_hyp_idmap(void);
#define kvm_set_pte(ptep, pte) set_pte(ptep, pte)
#define kvm_set_pmd(pmdp, pmd) set_pmd(pmdp, pmd)
static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
{
pte_val(pte) |= PTE_S2_RDWR;

12
virt/kvm/arm/mmu.c
View File

@ -177,6 +177,18 @@ static void clear_stage2_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr
put_page(virt_to_page(pmd));
}
static inline void kvm_set_pte(pte_t *ptep, pte_t new_pte)
{
WRITE_ONCE(*ptep, new_pte);
dsb(ishst);
}
static inline void kvm_set_pmd(pmd_t *pmdp, pmd_t new_pmd)
{
WRITE_ONCE(*pmdp, new_pmd);
dsb(ishst);
}
/*
* Unmapping vs dcache management:
*