From: Mukesh Rathor Date: Wed, 17 Oct 2012 17:26:15 +0000 (-0700) Subject: xen/pvh: Support ParaVirtualized Hardware extensions. X-Git-Tag: next-20121101~32^2^2~14 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c52a88c93aad4ba3d087f3804c1bc9285b64c3f6;p=karo-tx-linux.git xen/pvh: Support ParaVirtualized Hardware extensions. PVH allows PV linux guest to utilize hardware extended capabilities, such as running MMU updates in a HVM container. This patch allows it to be configured and enabled. Also, basic header file changes to add new subcalls to physmap hypercall. Lastly, mfn_to_local_pfn must return mfn for paging mode translate (since we let the hypervisor - or CPU - do them for us). Acked-by: Stefano Stabellini Signed-off-by: Mukesh Rathor Signed-off-by: Konrad Rzeszutek Wilk --- diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index 472b9b783019..6af440d5a533 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -159,6 +159,9 @@ static inline xpaddr_t machine_to_phys(xmaddr_t machine) static inline unsigned long mfn_to_local_pfn(unsigned long mfn) { unsigned long pfn = mfn_to_pfn(mfn); + + if (xen_feature(XENFEAT_auto_translated_physmap)) + return mfn; if (get_phys_to_machine(pfn) != mfn) return -1; /* force !pfn_valid() */ return pfn; diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig index fdce49c7aff6..c9660bf3c293 100644 --- a/arch/x86/xen/Kconfig +++ b/arch/x86/xen/Kconfig @@ -50,3 +50,13 @@ config XEN_DEBUG_FS Enable statistics output and various tuning options in debugfs. Enabling this option may incur a significant performance overhead. +config XEN_X86_PVH + bool "Support for running as a PVH guest (EXPERIMENTAL)" + depends on X86_64 && XEN && EXPERIMENTAL + default n + help + This option enables support for running as a PVH guest (PV guest + using hardware extensions) under a suitably capable hypervisor. + This option is EXPERIMENTAL because the hypervisor interfaces + which it uses is not yet considered stable therefore backwards and + forwards compatibility is not yet guaranteed. If unsure, say N. diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S index 7faed5869e5b..1a6bca11cc28 100644 --- a/arch/x86/xen/xen-head.S +++ b/arch/x86/xen/xen-head.S @@ -13,6 +13,15 @@ #include #include +#ifdef CONFIG_XEN_X86_PVH +#define FEATURES_PVH "|writable_descriptor_tables" \ + "|auto_translated_physmap" \ + "|supervisor_mode_kernel" \ + "|hvm_callback_vector" +#else +#define FEATURES_PVH /* Not supported */ +#endif + __INIT ENTRY(startup_xen) cld @@ -95,7 +104,7 @@ NEXT_HYPERCALL(arch_6) #endif ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen) ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page) - ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz "!writable_page_tables|pae_pgdir_above_4gb") + ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz "!writable_page_tables|pae_pgdir_above_4gb"FEATURES_PVH) ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes") ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic") ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h index 90712e2072d5..b2e95934794f 100644 --- a/include/xen/interface/memory.h +++ b/include/xen/interface/memory.h @@ -169,7 +169,13 @@ struct xen_add_to_physmap { /* Source mapping space. */ #define XENMAPSPACE_shared_info 0 /* shared info page */ #define XENMAPSPACE_grant_table 1 /* grant table page */ - unsigned int space; +#define XENMAPSPACE_gmfn 2 /* GMFN */ +#define XENMAPSPACE_gmfn_range 3 /* GMFN range */ +#define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another guest */ + uint16_t space; + domid_t foreign_domid; /* IFF XENMAPSPACE_gmfn_foreign */ + +#define XENMAPIDX_grant_table_status 0x80000000 /* Index into source mapping space. */ xen_ulong_t idx; @@ -217,4 +223,20 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map); * during a driver critical region. */ extern spinlock_t xen_reservation_lock; + +/* + * Unmaps the page appearing at a particular GPFN from the specified guest's + * pseudophysical address space. + * arg == addr of xen_remove_from_physmap_t. + */ +#define XENMEM_remove_from_physmap 15 +struct xen_remove_from_physmap { + /* Which domain to change the mapping for. */ + domid_t domid; + + /* GPFN of the current mapping of the page. */ + xen_pfn_t gpfn; +}; +DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap); + #endif /* __XEN_PUBLIC_MEMORY_H__ */ diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h index 1844d31f4552..83050d32bf46 100644 --- a/include/xen/interface/physdev.h +++ b/include/xen/interface/physdev.h @@ -274,6 +274,16 @@ struct physdev_dbgp_op { } u; }; +#define PHYSDEVOP_map_iomem 30 +struct physdev_map_iomem { + /* IN */ + uint64_t first_gfn; + uint64_t first_mfn; + uint32_t nr_mfns; + uint32_t add_mapping; /* 1 == add mapping; 0 == unmap */ + +}; + /* * Notify that some PIRQ-bound event channels have been unmasked. * ** This command is obsolete since interface version 0x00030202 and is **