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[Xen-devel] [RFC][PATCH] 1/9 Populate-on-demand memory: p2m query type

To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>

From: "George Dunlap" <George.Dunlap@xxxxxxxxxxxxx>

Date: Tue, 23 Dec 2008 13:36:32 +0000

Delivery-date: Tue, 23 Dec 2008 05:36:56 -0800

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List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Add a p2m query type. Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx> diff -r e9c8cd6c3de7 xen/arch/x86/mm/hap/p2m-ept.c --- a/xen/arch/x86/mm/hap/p2m-ept.c Wed Nov 19 15:49:55 2008 +0000 +++ b/xen/arch/x86/mm/hap/p2m-ept.c Wed Nov 19 16:00:04 2008 +0000 @@ -274,7 +274,8 @@ } /* Read ept p2m entries */ -static mfn_t ept_get_entry(struct domain *d, unsigned long gfn, p2m_type_t *t) +static mfn_t ept_get_entry(struct domain *d, unsigned long gfn, p2m_type_t *t, + p2m_query_t q) { ept_entry_t *table = map_domain_page(mfn_x(pagetable_get_mfn(d->arch.phys_table))); @@ -359,9 +360,10 @@ return content; } -static mfn_t ept_get_entry_current(unsigned long gfn, p2m_type_t *t) +static mfn_t ept_get_entry_current(unsigned long gfn, p2m_type_t *t, + p2m_query_t q) { - return ept_get_entry(current->domain, gfn, t); + return ept_get_entry(current->domain, gfn, t, q); } void ept_change_entry_emt_with_range(struct domain *d, unsigned long start_gfn, diff -r e9c8cd6c3de7 xen/arch/x86/mm/p2m.c --- a/xen/arch/x86/mm/p2m.c Wed Nov 19 15:49:55 2008 +0000 +++ b/xen/arch/x86/mm/p2m.c Wed Nov 19 16:00:04 2008 +0000 @@ -345,7 +345,8 @@ } static mfn_t -p2m_gfn_to_mfn(struct domain *d, unsigned long gfn, p2m_type_t *t) +p2m_gfn_to_mfn(struct domain *d, unsigned long gfn, p2m_type_t *t, + p2m_query_t q) { mfn_t mfn; paddr_t addr = ((paddr_t)gfn) << PAGE_SHIFT; @@ -436,7 +437,8 @@ } /* Read the current domain's p2m table (through the linear mapping). */ -static mfn_t p2m_gfn_to_mfn_current(unsigned long gfn, p2m_type_t *t) +static mfn_t p2m_gfn_to_mfn_current(unsigned long gfn, p2m_type_t *t, + p2m_query_t q) { mfn_t mfn = _mfn(INVALID_MFN); p2m_type_t p2mt = p2m_mmio_dm; diff -r e9c8cd6c3de7 xen/include/asm-x86/guest_pt.h --- a/xen/include/asm-x86/guest_pt.h Wed Nov 19 15:49:55 2008 +0000 +++ b/xen/include/asm-x86/guest_pt.h Wed Nov 19 16:00:04 2008 +0000 @@ -49,7 +49,7 @@ /* Override gfn_to_mfn to work with gfn_t */ #undef gfn_to_mfn -#define gfn_to_mfn(d, g, t) _gfn_to_mfn((d), gfn_x(g), (t)) +#define gfn_to_mfn(d, g, t) _gfn_to_mfn_type((d), gfn_x(g), (t), p2m_alloc) /* Types of the guest's page tables and access functions for them */ diff -r e9c8cd6c3de7 xen/include/asm-x86/p2m.h --- a/xen/include/asm-x86/p2m.h Wed Nov 19 15:49:55 2008 +0000 +++ b/xen/include/asm-x86/p2m.h Wed Nov 19 16:00:04 2008 +0000 @@ -66,6 +66,12 @@ p2m_mmio_direct = 5, /* Read/write mapping of genuine MMIO area */ } p2m_type_t; +typedef enum { + p2m_query = 0, /* Do not populate a PoD entries */ + p2m_alloc = 1, /* Automatically populate PoD entries */ + p2m_guest = 2, /* Guest demand-fault; implies alloc */ +} p2m_query_t; + /* We use bitmaps and maks to handle groups of types */ #define p2m_to_mask(_t) (1UL << (_t)) @@ -105,9 +111,11 @@ mfn_t mfn, unsigned int page_order, p2m_type_t p2mt); mfn_t (*get_entry )(struct domain *d, unsigned long gfn, - p2m_type_t *p2mt); + p2m_type_t *p2mt, + p2m_query_t q); mfn_t (*get_entry_current)(unsigned long gfn, - p2m_type_t *p2mt); + p2m_type_t *p2mt, + p2m_query_t q); void (*change_entry_type_global)(struct domain *d, p2m_type_t ot, p2m_type_t nt); @@ -123,23 +131,26 @@ return (flags >> 9) & 0x7; } -/* Read the current domain's p2m table. */ -static inline mfn_t gfn_to_mfn_current(unsigned long gfn, p2m_type_t *t) +/* Read the current domain's p2m table. Do not populate PoD pages. */ +static inline mfn_t gfn_to_mfn_type_current(unsigned long gfn, p2m_type_t *t, + p2m_query_t q) { - return current->domain->arch.p2m->get_entry_current(gfn, t); + return current->domain->arch.p2m->get_entry_current(gfn, t, q); } -/* Read another domain's P2M table, mapping pages as we go */ +/* Read another domain's P2M table, mapping pages as we go. + * Do not populate PoD pages. */ static inline -mfn_t gfn_to_mfn_foreign(struct domain *d, unsigned long gfn, p2m_type_t *t) +mfn_t gfn_to_mfn_type_foreign(struct domain *d, unsigned long gfn, p2m_type_t *t, + p2m_query_t q) { - return d->arch.p2m->get_entry(d, gfn, t); + return d->arch.p2m->get_entry(d, gfn, t, q); } /* General conversion function from gfn to mfn */ -#define gfn_to_mfn(d, g, t) _gfn_to_mfn((d), (g), (t)) -static inline mfn_t _gfn_to_mfn(struct domain *d, - unsigned long gfn, p2m_type_t *t) +static inline mfn_t _gfn_to_mfn_type(struct domain *d, + unsigned long gfn, p2m_type_t *t, + p2m_query_t q) { if ( !paging_mode_translate(d) ) { @@ -149,10 +160,17 @@ return _mfn(gfn); } if ( likely(current->domain == d) ) - return gfn_to_mfn_current(gfn, t); + return gfn_to_mfn_type_current(gfn, t, q); else - return gfn_to_mfn_foreign(d, gfn, t); + return gfn_to_mfn_type_foreign(d, gfn, t, q); } + +#define gfn_to_mfn(d, g, t) _gfn_to_mfn_type((d), (g), (t), p2m_alloc) +#define gfn_to_mfn_query(d, g, t) _gfn_to_mfn_type((d), (g), (t), p2m_query) +#define gfn_to_mfn_guest(d, g, t) _gfn_to_mfn_type((d), (g), (t), p2m_guest) + +#define gfn_to_mfn_current(g, t) gfn_to_mfn_type_current((g), (t), p2m_alloc) +#define gfn_to_mfn_foreign(d, g, t) gfn_to_mfn_type_foreign((d), (g), (t), p2m_alloc) /* Compatibility function exporting the old untyped interface */ static inline unsigned long gmfn_to_mfn(struct domain *d, unsigned long gpfn) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel

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