diff options
| -rw-r--r-- | arch/x86/include/asm/xen/interface.h | 96 | ||||
| -rw-r--r-- | include/xen/interface/xen.h | 35 |
2 files changed, 107 insertions, 24 deletions
diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h index 3400dba..3b88eea 100644 --- a/arch/x86/include/asm/xen/interface.h +++ b/arch/x86/include/asm/xen/interface.h @@ -3,12 +3,38 @@ * * Guest OS interface to x86 Xen. * - * Copyright (c) 2004, K A Fraser + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Copyright (c) 2004-2006, K A Fraser */ #ifndef _ASM_X86_XEN_INTERFACE_H #define _ASM_X86_XEN_INTERFACE_H +/* + * XEN_GUEST_HANDLE represents a guest pointer, when passed as a field + * in a struct in memory. + * XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an + * hypercall argument. + * XEN_GUEST_HANDLE_PARAM and XEN_GUEST_HANDLE are the same on X86 but + * they might not be on other architectures. + */ #ifdef __XEN__ #define __DEFINE_GUEST_HANDLE(name, type) \ typedef struct { type *p; } __guest_handle_ ## name @@ -88,13 +114,16 @@ DEFINE_GUEST_HANDLE(xen_ulong_t); * start of the GDT because some stupid OSes export hard-coded selector values * in their ABI. These hard-coded values are always near the start of the GDT, * so Xen places itself out of the way, at the far end of the GDT. + * + * NB The LDT is set using the MMUEXT_SET_LDT op of HYPERVISOR_mmuext_op */ #define FIRST_RESERVED_GDT_PAGE 14 #define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096) #define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8) /* - * Send an array of these to HYPERVISOR_set_trap_table() + * Send an array of these to HYPERVISOR_set_trap_table(). + * Terminate the array with a sentinel entry, with traps[].address==0. * The privilege level specifies which modes may enter a trap via a software * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate * privilege levels as follows: @@ -118,10 +147,41 @@ struct trap_info { DEFINE_GUEST_HANDLE_STRUCT(trap_info); struct arch_shared_info { - unsigned long max_pfn; /* max pfn that appears in table */ - /* Frame containing list of mfns containing list of mfns containing p2m. */ - unsigned long pfn_to_mfn_frame_list_list; - unsigned long nmi_reason; + /* + * Number of valid entries in the p2m table(s) anchored at + * pfn_to_mfn_frame_list_list and/or p2m_vaddr. + */ + unsigned long max_pfn; + /* + * Frame containing list of mfns containing list of mfns containing p2m. + * A value of 0 indicates it has not yet been set up, ~0 indicates it + * has been set to invalid e.g. due to the p2m being too large for the + * 3-level p2m tree. In this case the linear mapper p2m list anchored + * at p2m_vaddr is to be used. + */ + xen_pfn_t pfn_to_mfn_frame_list_list; + unsigned long nmi_reason; + /* + * Following three fields are valid if p2m_cr3 contains a value + * different from 0. + * p2m_cr3 is the root of the address space where p2m_vaddr is valid. + * p2m_cr3 is in the same format as a cr3 value in the vcpu register + * state and holds the folded machine frame number (via xen_pfn_to_cr3) + * of a L3 or L4 page table. + * p2m_vaddr holds the virtual address of the linear p2m list. All + * entries in the range [0...max_pfn[ are accessible via this pointer. + * p2m_generation will be incremented by the guest before and after each + * change of the mappings of the p2m list. p2m_generation starts at 0 + * and a value with the least significant bit set indicates that a + * mapping update is in progress. This allows guest external software + * (e.g. in Dom0) to verify that read mappings are consistent and + * whether they have changed since the last check. + * Modifying a p2m element in the linear p2m list is allowed via an + * atomic write only. + */ + unsigned long p2m_cr3; /* cr3 value of the p2m address space */ + unsigned long p2m_vaddr; /* virtual address of the p2m list */ + unsigned long p2m_generation; /* generation count of p2m mapping */ }; #endif /* !__ASSEMBLY__ */ @@ -137,13 +197,31 @@ struct arch_shared_info { /* * The following is all CPU context. Note that the fpu_ctxt block is filled * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used. + * + * Also note that when calling DOMCTL_setvcpucontext and VCPU_initialise + * for HVM and PVH guests, not all information in this structure is updated: + * + * - For HVM guests, the structures read include: fpu_ctxt (if + * VGCT_I387_VALID is set), flags, user_regs, debugreg[*] + * + * - PVH guests are the same as HVM guests, but additionally use ctrlreg[3] to + * set cr3. All other fields not used should be set to 0. */ struct vcpu_guest_context { /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */ struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */ -#define VGCF_I387_VALID (1<<0) -#define VGCF_HVM_GUEST (1<<1) -#define VGCF_IN_KERNEL (1<<2) +#define VGCF_I387_VALID (1<<0) +#define VGCF_IN_KERNEL (1<<2) +#define _VGCF_i387_valid 0 +#define VGCF_i387_valid (1<<_VGCF_i387_valid) +#define _VGCF_in_kernel 2 +#define VGCF_in_kernel (1<<_VGCF_in_kernel) +#define _VGCF_failsafe_disables_events 3 +#define VGCF_failsafe_disables_events (1<<_VGCF_failsafe_disables_events) +#define _VGCF_syscall_disables_events 4 +#define VGCF_syscall_disables_events (1<<_VGCF_syscall_disables_events) +#define _VGCF_online 5 +#define VGCF_online (1<<_VGCF_online) unsigned long flags; /* VGCF_* flags */ struct cpu_user_regs user_regs; /* User-level CPU registers */ struct trap_info trap_ctxt[256]; /* Virtual IDT */ diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h index a483789..8194270 100644 --- a/include/xen/interface/xen.h +++ b/include/xen/interface/xen.h @@ -585,26 +585,29 @@ struct shared_info { }; /* - * Start-of-day memory layout for the initial domain (DOM0): + * Start-of-day memory layout + * * 1. The domain is started within contiguous virtual-memory region. * 2. The contiguous region begins and ends on an aligned 4MB boundary. - * 3. The region start corresponds to the load address of the OS image. - * If the load address is not 4MB aligned then the address is rounded down. - * 4. This the order of bootstrap elements in the initial virtual region: + * 3. This the order of bootstrap elements in the initial virtual region: * a. relocated kernel image * b. initial ram disk [mod_start, mod_len] + * (may be omitted) * c. list of allocated page frames [mfn_list, nr_pages] + * (unless relocated due to XEN_ELFNOTE_INIT_P2M) * d. start_info_t structure [register ESI (x86)] - * e. bootstrap page tables [pt_base, CR3 (x86)] - * f. bootstrap stack [register ESP (x86)] - * 5. Bootstrap elements are packed together, but each is 4kB-aligned. - * 6. The initial ram disk may be omitted. - * 7. The list of page frames forms a contiguous 'pseudo-physical' memory + * in case of dom0 this page contains the console info, too + * e. unless dom0: xenstore ring page + * f. unless dom0: console ring page + * g. bootstrap page tables [pt_base, CR3 (x86)] + * h. bootstrap stack [register ESP (x86)] + * 4. Bootstrap elements are packed together, but each is 4kB-aligned. + * 5. The list of page frames forms a contiguous 'pseudo-physical' memory * layout for the domain. In particular, the bootstrap virtual-memory * region is a 1:1 mapping to the first section of the pseudo-physical map. - * 8. All bootstrap elements are mapped read-writable for the guest OS. The + * 6. All bootstrap elements are mapped read-writable for the guest OS. The * only exception is the bootstrap page table, which is mapped read-only. - * 9. There is guaranteed to be at least 512kB padding after the final + * 7. There is guaranteed to be at least 512kB padding after the final * bootstrap element. If necessary, the bootstrap virtual region is * extended by an extra 4MB to ensure this. */ @@ -641,10 +644,12 @@ struct start_info { }; /* These flags are passed in the 'flags' field of start_info_t. */ -#define SIF_PRIVILEGED (1<<0) /* Is the domain privileged? */ -#define SIF_INITDOMAIN (1<<1) /* Is this the initial control domain? */ -#define SIF_MULTIBOOT_MOD (1<<2) /* Is mod_start a multiboot module? */ -#define SIF_MOD_START_PFN (1<<3) /* Is mod_start a PFN? */ +#define SIF_PRIVILEGED (1<<0) /* Is the domain privileged? */ +#define SIF_INITDOMAIN (1<<1) /* Is this the initial control domain? */ +#define SIF_MULTIBOOT_MOD (1<<2) /* Is mod_start a multiboot module? */ +#define SIF_MOD_START_PFN (1<<3) /* Is mod_start a PFN? */ +#define SIF_VIRT_P2M_4TOOLS (1<<4) /* Do Xen tools understand a virt. mapped */ + /* P->M making the 3 level tree obsolete? */ #define SIF_PM_MASK (0xFF<<8) /* reserve 1 byte for xen-pm options */ /* |
