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KVM: arm64: Support PUD hugepage in stage2_is_exec()

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In preparation for creating PUD hugepages at stage 2, add support for
detecting execute permissions on PUD page table entries. Faults due to
lack of execute permissions on page table entries is used to perform
i-cache invalidation on first execute.

Provide trivial implementations of arm32 helpers to allow sharing of
code.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
[ Replaced BUG() => WARN_ON(1) in arm32 PUD helpers ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Punit Agrawal
2018-12-11 17:10:38 +00:00
committed by Marc Zyngier
parent 4ea5af5311
commit 86d1c55ea6
4 changed files with 61 additions and 5 deletions
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6
arch/arm/include/asm/kvm_mmu.h
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@@ -102,6 +102,12 @@ static inline bool kvm_s2pud_readonly(pud_t *pud)
return false;
}
static inline bool kvm_s2pud_exec(pud_t *pud)
{
WARN_ON(1);
return false;
}
static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
{
pte_val(pte) |= L_PTE_S2_RDWR;