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KVM: ARM: Support hugetlbfs backed huge pages

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Support huge pages in KVM/ARM and KVM/ARM64.  The pud_huge checking on
the unmap path may feel a bit silly as the pud_huge check is always
defined to false, but the compiler should be smart about this.

Note: This deals only with VMAs marked as huge which are allocated by
users through hugetlbfs only.  Transparent huge pages can only be
detected by looking at the underlying pages (or the page tables
themselves) and this patch so far simply maps these on a page-by-page
level in the Stage-2 page tables.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Christoffer Dall
2012-11-01 17:14:45 +01:00
parent 86ed81aa2e
commit ad361f093c
5 changed files with 158 additions and 44 deletions
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12
arch/arm64/include/asm/kvm_mmu.h
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@@ -91,6 +91,7 @@ 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 bool kvm_is_write_fault(unsigned long esr)
{
@@ -116,13 +117,18 @@ static inline void kvm_set_s2pte_writable(pte_t *pte)
pte_val(*pte) |= PTE_S2_RDWR;
}
static inline void kvm_set_s2pmd_writable(pmd_t *pmd)
{
pmd_val(*pmd) |= PMD_S2_RDWR;
}
struct kvm;
static inline void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn)
static inline void coherent_icache_guest_page(struct kvm *kvm, hva_t hva,
unsigned long size)
{
if (!icache_is_aliasing()) { /* PIPT */
unsigned long hva = gfn_to_hva(kvm, gfn);
flush_icache_range(hva, hva + PAGE_SIZE);
flush_icache_range(hva, hva + size);
} else if (!icache_is_aivivt()) { /* non ASID-tagged VIVT */
/* any kind of VIPT cache */
__flush_icache_all();