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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC 02/16] xen/arm: Introduce helpers to get/set an MFN from/to an LPAE entry
On Mon, 8 Oct 2018, Julien Grall wrote:
> The new helpers make it easier to read the code by abstracting the way to
> set/get an MFN from/to an LPAE entry. The helpers are using "walk" as the
> bits are common across different LPAE stages.
>
> At the same time, use the new helpers to replace the various open-coding
> place.
>
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> ---
> This patch was originally sent separately.
> ---
> xen/arch/arm/mm.c | 10 +++++-----
> xen/arch/arm/p2m.c | 19 ++++++++++---------
> xen/include/asm-arm/lpae.h | 3 +++
> 3 files changed, 18 insertions(+), 14 deletions(-)
>
> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
> index 7a06a33e21..0bc31b1d9b 100644
> --- a/xen/arch/arm/mm.c
> +++ b/xen/arch/arm/mm.c
> @@ -238,7 +238,7 @@ void dump_pt_walk(paddr_t ttbr, paddr_t addr,
>
> /* For next iteration */
> unmap_domain_page(mapping);
> - mapping = map_domain_page(_mfn(pte.walk.base));
> + mapping = map_domain_page(lpae_get_mfn(pte));
> }
>
> unmap_domain_page(mapping);
> @@ -323,7 +323,7 @@ static inline lpae_t mfn_to_xen_entry(mfn_t mfn, unsigned
> attr)
>
> ASSERT(!(mfn_to_maddr(mfn) & ~PADDR_MASK));
>
> - e.pt.base = mfn_x(mfn);
> + lpae_set_mfn(e, mfn);
>
> return e;
> }
> @@ -490,7 +490,7 @@ mfn_t domain_page_map_to_mfn(const void *ptr)
> ASSERT(slot >= 0 && slot < DOMHEAP_ENTRIES);
> ASSERT(map[slot].pt.avail != 0);
>
> - return _mfn(map[slot].pt.base + offset);
> + return mfn_add(lpae_get_mfn(map[slot]), offset);
> }
> #endif
>
> @@ -851,7 +851,7 @@ void __init setup_xenheap_mappings(unsigned long base_mfn,
> /* mfn_to_virt is not valid on the 1st 1st mfn, since it
> * is not within the xenheap. */
> first = slot == xenheap_first_first_slot ?
> - xenheap_first_first : __mfn_to_virt(p->pt.base);
> + xenheap_first_first : mfn_to_virt(lpae_get_mfn(*p));
> }
> else if ( xenheap_first_first_slot == -1)
> {
> @@ -1007,7 +1007,7 @@ static int create_xen_entries(enum xenmap_operation op,
>
> BUG_ON(!lpae_is_valid(*entry));
>
> - third = __mfn_to_virt(entry->pt.base);
> + third = mfn_to_virt(lpae_get_mfn(*entry));
> entry = &third[third_table_offset(addr)];
>
> switch ( op ) {
> diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
> index 30cfb01498..f8a2f6459e 100644
> --- a/xen/arch/arm/p2m.c
> +++ b/xen/arch/arm/p2m.c
> @@ -265,7 +265,7 @@ static int p2m_next_level(struct p2m_domain *p2m, bool
> read_only,
> if ( lpae_is_mapping(*entry, level) )
> return GUEST_TABLE_SUPER_PAGE;
>
> - mfn = _mfn(entry->p2m.base);
> + mfn = lpae_get_mfn(*entry);
>
> unmap_domain_page(*table);
> *table = map_domain_page(mfn);
> @@ -349,7 +349,7 @@ mfn_t p2m_get_entry(struct p2m_domain *p2m, gfn_t gfn,
> if ( a )
> *a = p2m_mem_access_radix_get(p2m, gfn);
>
> - mfn = _mfn(entry.p2m.base);
> + mfn = lpae_get_mfn(entry);
> /*
> * The entry may point to a superpage. Find the MFN associated
> * to the GFN.
> @@ -519,7 +519,7 @@ static lpae_t mfn_to_p2m_entry(mfn_t mfn, p2m_type_t t,
> p2m_access_t a)
>
> ASSERT(!(mfn_to_maddr(mfn) & ~PADDR_MASK));
>
> - e.p2m.base = mfn_x(mfn);
> + lpae_set_mfn(e, mfn);
>
> return e;
> }
> @@ -621,7 +621,7 @@ static void p2m_put_l3_page(const lpae_t pte)
> */
> if ( p2m_is_foreign(pte.p2m.type) )
> {
> - mfn_t mfn = _mfn(pte.p2m.base);
> + mfn_t mfn = lpae_get_mfn(pte);
>
> ASSERT(mfn_valid(mfn));
> put_page(mfn_to_page(mfn));
> @@ -655,7 +655,7 @@ static void p2m_free_entry(struct p2m_domain *p2m,
> return;
> }
>
> - table = map_domain_page(_mfn(entry.p2m.base));
> + table = map_domain_page(lpae_get_mfn(entry));
> for ( i = 0; i < LPAE_ENTRIES; i++ )
> p2m_free_entry(p2m, *(table + i), level + 1);
>
> @@ -669,7 +669,7 @@ static void p2m_free_entry(struct p2m_domain *p2m,
> */
> p2m_tlb_flush_sync(p2m);
>
> - mfn = _mfn(entry.p2m.base);
> + mfn = lpae_get_mfn(entry);
> ASSERT(mfn_valid(mfn));
>
> pg = mfn_to_page(mfn);
> @@ -688,7 +688,7 @@ static bool p2m_split_superpage(struct p2m_domain *p2m,
> lpae_t *entry,
> bool rv = true;
>
> /* Convenience aliases */
> - mfn_t mfn = _mfn(entry->p2m.base);
> + mfn_t mfn = lpae_get_mfn(*entry);
> unsigned int next_level = level + 1;
> unsigned int level_order = level_orders[next_level];
>
> @@ -719,7 +719,7 @@ static bool p2m_split_superpage(struct p2m_domain *p2m,
> lpae_t *entry,
> * the necessary fields. So the correct permission are kept.
> */
> pte = *entry;
> - pte.p2m.base = mfn_x(mfn_add(mfn, i << level_order));
> + lpae_set_mfn(pte, mfn_add(mfn, i << level_order));
>
> /*
> * First and second level pages set p2m.table = 0, but third
> @@ -952,7 +952,8 @@ static int __p2m_set_entry(struct p2m_domain *p2m,
> * Free the entry only if the original pte was valid and the base
> * is different (to avoid freeing when permission is changed).
> */
> - if ( lpae_is_valid(orig_pte) && entry->p2m.base != orig_pte.p2m.base )
> + if ( lpae_is_valid(orig_pte) &&
> + !mfn_eq(lpae_get_mfn(*entry), lpae_get_mfn(orig_pte)) )
> p2m_free_entry(p2m, orig_pte, level);
>
> if ( need_iommu_pt_sync(p2m->domain) &&
> diff --git a/xen/include/asm-arm/lpae.h b/xen/include/asm-arm/lpae.h
> index 15595cd35c..17fdc6074f 100644
> --- a/xen/include/asm-arm/lpae.h
> +++ b/xen/include/asm-arm/lpae.h
> @@ -153,6 +153,9 @@ static inline bool lpae_is_superpage(lpae_t pte, unsigned
> int level)
> return (level < 3) && lpae_is_mapping(pte, level);
> }
>
> +#define lpae_get_mfn(pte) (_mfn((pte).walk.base))
> +#define lpae_set_mfn(pte, mfn) ((pte).walk.base = mfn_x(mfn))
> +
> /*
> * AArch64 supports pages with different sizes (4K, 16K, and 64K). To enable
> * page table walks for various configurations, the following helpers enable
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