[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v7 7/7] xen/arm: introduce allocate_static_memory
This commit introduces a new function allocate_static_memory to allocate static memory as guest RAM for domains on Static Allocation. It uses acquire_domstatic_pages to acquire pre-configured static memory for the domain, and uses guest_physmap_add_pages to set up the P2M table. These pre-defined static memory banks shall be mapped to the usual guest memory addresses (GUEST_RAM0_BASE, GUEST_RAM1_BASE) defined by xen/include/public/arch-arm.h. In order to deal with the trouble of count-to-order conversion when page number is not in a power-of-two, this commit exports p2m_insert_mapping and introduce a new function guest_physmap_add_pages to cope with adding guest RAM p2m mapping with nr_pages. Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> --- xen/arch/arm/domain_build.c | 161 +++++++++++++++++++++++++++++++++++- xen/arch/arm/p2m.c | 7 +- xen/include/asm-arm/p2m.h | 11 +++ 3 files changed, 173 insertions(+), 6 deletions(-) diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 206038d1c0..62ab7d0ead 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -480,6 +480,162 @@ fail: (unsigned long)kinfo->unassigned_mem >> 10); } +#ifdef CONFIG_STATIC_MEMORY +static bool __init append_static_memory_to_bank(struct domain *d, + struct membank *bank, + mfn_t smfn, + paddr_t size) +{ + int res; + unsigned int nr_pages = PFN_DOWN(size); + /* Infer next GFN. */ + gfn_t sgfn = gaddr_to_gfn(bank->start + bank->size); + + res = guest_physmap_add_pages(d, sgfn, smfn, nr_pages); + if ( res ) + { + dprintk(XENLOG_ERR, "Failed to map pages to DOMU: %d", res); + return false; + } + + bank->size = bank->size + size; + + return true; +} + +/* Allocate memory from static memory as RAM for one specific domain d. */ +static void __init allocate_static_memory(struct domain *d, + struct kernel_info *kinfo, + const struct dt_device_node *node) +{ + const struct dt_property *prop; + u32 addr_cells, size_cells, reg_cells; + unsigned int nr_banks, gbank, bank = 0; + const uint64_t rambase[] = GUEST_RAM_BANK_BASES; + const uint64_t ramsize[] = GUEST_RAM_BANK_SIZES; + const __be32 *cell; + u64 tot_size = 0; + paddr_t pbase, psize, gsize; + mfn_t smfn; + int res; + + prop = dt_find_property(node, "xen,static-mem", NULL); + if ( !dt_property_read_u32(node, "#xen,static-mem-address-cells", + &addr_cells) ) + { + printk(XENLOG_ERR + "%pd: failed to read \"#xen,static-mem-address-cells\".\n", d); + goto fail; + } + + if ( !dt_property_read_u32(node, "#xen,static-mem-size-cells", + &size_cells) ) + { + printk(XENLOG_ERR + "%pd: failed to read \"#xen,static-mem-size-cells\".\n", d); + goto fail; + } + reg_cells = addr_cells + size_cells; + + /* + * The static memory will be mapped in the guest at the usual guest memory + * addresses (GUEST_RAM0_BASE, GUEST_RAM1_BASE) defined by + * xen/include/public/arch-arm.h. + */ + gbank = 0; + gsize = ramsize[gbank]; + kinfo->mem.bank[gbank].start = rambase[gbank]; + + cell = (const __be32 *)prop->value; + nr_banks = (prop->length) / (reg_cells * sizeof (u32)); + + for ( ; bank < nr_banks; bank++ ) + { + device_tree_get_reg(&cell, addr_cells, size_cells, &pbase, &psize); + ASSERT(IS_ALIGNED(pbase, PAGE_SIZE) && IS_ALIGNED(psize, PAGE_SIZE)); + + smfn = maddr_to_mfn(pbase); + res = acquire_domstatic_pages(d, smfn, PFN_DOWN(psize), 0); + if ( res ) + { + printk(XENLOG_ERR + "%pd: failed to acquire static memory: %d.\n", d, res); + goto fail; + } + + printk(XENLOG_INFO "%pd: STATIC BANK[%u] %#"PRIpaddr"-%#"PRIpaddr"\n", + d, bank, pbase, pbase + psize); + + while ( 1 ) + { + /* Map as much as possible the static range to the guest bank */ + if ( !append_static_memory_to_bank(d, &kinfo->mem.bank[gbank], smfn, + min(psize, gsize)) ) + goto fail; + + /* + * The current physical bank is fully mapped. + * Handle the next physical bank. + */ + if ( gsize >= psize ) + { + gsize = gsize - psize; + break; + } + /* + * When current guest bank is not enough to map, exhaust + * the current one and seek to the next. + * Before seeking to the next, check if we still have available + * guest bank. + */ + else if ( (gbank + 1) >= GUEST_RAM_BANKS ) + { + printk(XENLOG_ERR "Exhausted all possible guest banks.\n"); + goto fail; + } + else + { + psize = psize - gsize; + smfn = mfn_add(smfn, gsize >> PAGE_SHIFT); + /* Update to the next guest bank. */ + gbank++; + gsize = ramsize[gbank]; + kinfo->mem.bank[gbank].start = rambase[gbank]; + } + } + + tot_size += psize; + } + + kinfo->mem.nr_banks = ++gbank; + + kinfo->unassigned_mem -= tot_size; + /* + * The property 'memory' should match the amount of memory given to the + * guest. + * Currently, it is only possible to either acquire static memory or let + * Xen allocate. *Mixing* is not supported. + */ + if ( kinfo->unassigned_mem ) + { + printk(XENLOG_ERR + "Size of \"memory\" property doesn't match up with the sum-up of \"xen,static-mem\". Unsupported configuration.\n"); + goto fail; + } + + return; + + fail: + panic("Failed to allocate requested static memory for domain %pd.", d); +} +#else +static void __init allocate_static_memory(struct domain *d, + struct kernel_info *kinfo, + const struct dt_device_node *node) +{ +} +#endif + static int __init write_properties(struct domain *d, struct kernel_info *kinfo, const struct dt_device_node *node) { @@ -2453,7 +2609,10 @@ static int __init construct_domU(struct domain *d, /* type must be set before allocate memory */ d->arch.type = kinfo.type; #endif - allocate_memory(d, &kinfo); + if ( !dt_find_property(node, "xen,static-mem", NULL) ) + allocate_memory(d, &kinfo); + else + allocate_static_memory(d, &kinfo, node); rc = prepare_dtb_domU(d, &kinfo); if ( rc < 0 ) diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c index eff9a105e7..6e01e83967 100644 --- a/xen/arch/arm/p2m.c +++ b/xen/arch/arm/p2m.c @@ -1293,11 +1293,8 @@ out: return resolved; } -static inline int p2m_insert_mapping(struct domain *d, - gfn_t start_gfn, - unsigned long nr, - mfn_t mfn, - p2m_type_t t) +int p2m_insert_mapping(struct domain *d, gfn_t start_gfn, unsigned long nr, + mfn_t mfn, p2m_type_t t) { struct p2m_domain *p2m = p2m_get_hostp2m(d); int rc; diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h index 6a2108398f..f885cc522b 100644 --- a/xen/include/asm-arm/p2m.h +++ b/xen/include/asm-arm/p2m.h @@ -300,6 +300,9 @@ int map_dev_mmio_region(struct domain *d, unsigned long nr, mfn_t mfn); +int p2m_insert_mapping(struct domain *d, gfn_t start_gfn, unsigned long nr, + mfn_t mfn, p2m_type_t t); + int guest_physmap_add_entry(struct domain *d, gfn_t gfn, mfn_t mfn, @@ -315,6 +318,14 @@ static inline int guest_physmap_add_page(struct domain *d, return guest_physmap_add_entry(d, gfn, mfn, page_order, p2m_ram_rw); } +static inline int guest_physmap_add_pages(struct domain *d, + gfn_t gfn, + mfn_t mfn, + unsigned int nr_pages) +{ + return p2m_insert_mapping(d, gfn, nr_pages, mfn, p2m_ram_rw); +} + mfn_t gfn_to_mfn(struct domain *d, gfn_t gfn); /* Look up a GFN and take a reference count on the backing page. */ -- 2.25.1
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