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xen: modify page table construction

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Modify the page table construction to allow multiple virtual regions
to be mapped. This is done as preparation for removing the p2m list
from the initial kernel mapping in order to support huge pv domains.

This allows a cleaner approach for mapping the relocator page by
using this capability.

The interface to the assembler level of the relocator has to be changed
in order to be able to process multiple page table areas.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Juergen Gross 2016-03-03 10:38:15 +01:00 committed by Daniel Kiper
parent 5500cefccd
commit b67a95ecad
6 changed files with 358 additions and 233 deletions
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87
grub-core/lib/i386/xen/relocator.S
View file

@ -16,6 +16,8 @@
* along with GRUB. If not, see <http://www.gnu.org/licenses/>. * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/ */
#include <grub/i386/memory.h>
#include <grub/i386/types.h>
#include <grub/symbol.h> #include <grub/symbol.h>
#include <grub/xen.h> #include <grub/xen.h>
@ -23,78 +25,86 @@
VARIABLE(grub_relocator_xen_remap_start) VARIABLE(grub_relocator_xen_remap_start)
LOCAL(base): LOCAL(base):
/* mov imm32, %ebx */ /* Remap the remapper to it's new address. */
/* mov imm32, %ebx - %ebx: new virtual address of remapper */
.byte 0xbb .byte 0xbb
VARIABLE(grub_relocator_xen_remapper_virt) VARIABLE(grub_relocator_xen_remapper_virt)
.long 0 .long 0
/* mov imm32, %ecx */ /* mov imm32, %ecx - %ecx: low part of page table entry */
.byte 0xb9 .byte 0xb9
VARIABLE(grub_relocator_xen_remapper_map) VARIABLE(grub_relocator_xen_remapper_map)
.long 0 .long 0
/* mov imm32, %edx */ /* mov imm32, %edx - %edx: high part of page table entry */
.byte 0xba .byte 0xba
VARIABLE(grub_relocator_xen_remapper_map_high) VARIABLE(grub_relocator_xen_remapper_map_high)
.long 0 .long 0
movl %ebx, %ebp movl %ebx, %ebp /* %ebx is clobbered by hypercall */
movl $2, %esi movl $UVMF_INVLPG, %esi /* esi: flags (inv. single entry) */
movl $__HYPERVISOR_update_va_mapping, %eax movl $__HYPERVISOR_update_va_mapping, %eax
int $0x82 int $0x82
movl %ebp, %ebx movl %ebp, %ebx
addl $(LOCAL(cont) - LOCAL(base)), %ebx addl $(LOCAL(cont) - LOCAL(base)), %ebx
jmp *%ebx jmp *%ebx /* Continue with new virtual address */
LOCAL(cont): LOCAL(cont):
xorl %eax, %eax /* Modify mappings of new page tables to be read-only. */
movl %eax, %ebp /* mov imm32, %eax */
.byte 0xb8
VARIABLE(grub_relocator_xen_paging_areas_addr)
.long 0
movl %eax, %ebx
1: 1:
movl 0(%ebx), %ebp /* Get start pfn of the current area */
movl GRUB_TARGET_SIZEOF_LONG(%ebx), %ecx /* Get # of pg tables */
testl %ecx, %ecx /* 0 -> last area reached */
jz 3f
addl $(2 * GRUB_TARGET_SIZEOF_LONG), %ebx
movl %ebx, %esp /* Save current area pointer */
2:
movl %ecx, %edi
/* mov imm32, %eax */ /* mov imm32, %eax */
.byte 0xb8 .byte 0xb8
VARIABLE(grub_relocator_xen_mfn_list) VARIABLE(grub_relocator_xen_mfn_list)
.long 0 .long 0
movl %eax, %edi movl 0(%eax, %ebp, 4), %ecx /* mfn */
movl %ebp, %eax movl %ebp, %ebx
movl 0(%edi, %eax, 4), %ecx shll $PAGE_SHIFT, %ebx /* virtual address (1:1 mapping) */
/* mov imm32, %ebx */
.byte 0xbb
VARIABLE(grub_relocator_xen_paging_start)
.long 0
shll $12, %eax
addl %eax, %ebx
movl %ecx, %edx movl %ecx, %edx
shll $12, %ecx shll $PAGE_SHIFT, %ecx /* prepare pte low part */
shrl $20, %edx shrl $(32 - PAGE_SHIFT), %edx /* pte high part */
orl $5, %ecx orl $(GRUB_PAGE_PRESENT | GRUB_PAGE_USER), %ecx /* pte low */
movl $2, %esi movl $UVMF_INVLPG, %esi
movl $__HYPERVISOR_update_va_mapping, %eax movl $__HYPERVISOR_update_va_mapping, %eax
int $0x82 int $0x82 /* parameters: eax, ebx, ecx, edx, esi */
incl %ebp incl %ebp /* next pfn */
/* mov imm32, %ecx */ movl %edi, %ecx
.byte 0xb9
VARIABLE(grub_relocator_xen_paging_size)
.long 0
cmpl %ebp, %ecx
ja 1b loop 2b
mov %esp, %ebx /* restore area poniter */
jmp 1b
3:
/* Switch page tables: pin new L3 pt, load cr3, unpin old L3. */
/* mov imm32, %ebx */ /* mov imm32, %ebx */
.byte 0xbb .byte 0xbb
VARIABLE(grub_relocator_xen_mmu_op_addr) VARIABLE(grub_relocator_xen_mmu_op_addr)
.long 0 .long 0
movl $3, %ecx movl $3, %ecx /* 3 mmu ops */
movl $0, %edx movl $0, %edx /* pdone (not used) */
movl $0x7FF0, %esi movl $DOMID_SELF, %esi
movl $__HYPERVISOR_mmuext_op, %eax movl $__HYPERVISOR_mmuext_op, %eax
int $0x82 int $0x82
/* Continue in virtual kernel mapping. */
/* mov imm32, %eax */ /* mov imm32, %eax */
.byte 0xb8 .byte 0xb8
VARIABLE(grub_relocator_xen_remap_continue) VARIABLE(grub_relocator_xen_remap_continue)
@ -102,6 +112,9 @@ VARIABLE(grub_relocator_xen_remap_continue)
jmp *%eax jmp *%eax
VARIABLE(grub_relocator_xen_paging_areas)
.long 0, 0, 0, 0, 0, 0, 0, 0
VARIABLE(grub_relocator_xen_mmu_op) VARIABLE(grub_relocator_xen_mmu_op)
.space 256 .space 256
@ -109,6 +122,7 @@ VARIABLE(grub_relocator_xen_remap_end)
VARIABLE(grub_relocator_xen_start) VARIABLE(grub_relocator_xen_start)
/* Unmap old remapper area. */
/* mov imm32, %eax */ /* mov imm32, %eax */
.byte 0xb8 .byte 0xb8
VARIABLE(grub_relocator_xen_remapper_virt2) VARIABLE(grub_relocator_xen_remapper_virt2)
@ -116,14 +130,14 @@ VARIABLE(grub_relocator_xen_remapper_virt2)
movl %eax, %edi movl %eax, %edi
xorl %ecx, %ecx xorl %ecx, %ecx /* Invalid pte */
xorl %edx, %edx xorl %edx, %edx
movl $2, %esi movl $UVMF_INVLPG, %esi
movl $__HYPERVISOR_update_va_mapping, %eax movl $__HYPERVISOR_update_va_mapping, %eax
int $0x82 int $0x82
/* Prepare registers for starting kernel. */
/* mov imm32, %eax */ /* mov imm32, %eax */
.byte 0xb8 .byte 0xb8
VARIABLE(grub_relocator_xen_stack) VARIABLE(grub_relocator_xen_stack)
@ -145,6 +159,7 @@ VARIABLE(grub_relocator_xen_start_info)
VARIABLE(grub_relocator_xen_entry_point) VARIABLE(grub_relocator_xen_entry_point)
.long 0 .long 0
/* Now start the new kernel. */
jmp *%eax jmp *%eax
VARIABLE(grub_relocator_xen_end) VARIABLE(grub_relocator_xen_end)

134
grub-core/lib/x86_64/xen/relocator.S
View file

@ -16,95 +16,85 @@
* along with GRUB. If not, see <http://www.gnu.org/licenses/>. * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/ */
#include <grub/x86_64/memory.h>
#include <grub/x86_64/types.h>
#include <grub/symbol.h> #include <grub/symbol.h>
#include <grub/xen.h> #include <grub/xen.h>
/* Macro to load an imm64 value stored by the C-part into %rax: */
#define MOV_IMM64_RAX(var) .byte 0x48, 0xb8; VARIABLE(var); .quad 0
.p2align 4 /* force 16-byte alignment */ .p2align 4 /* force 16-byte alignment */
VARIABLE(grub_relocator_xen_remap_start) VARIABLE(grub_relocator_xen_remap_start)
LOCAL(base): LOCAL(base):
/* mov imm64, %rax */ /* Remap the remapper to it's new address. */
.byte 0x48 MOV_IMM64_RAX(grub_relocator_xen_remapper_virt)
.byte 0xb8
VARIABLE(grub_relocator_xen_remapper_virt)
.quad 0
movq %rax, %rdi movq %rax, %rdi /* %rdi: new virtual address of remapper */
movq %rax, %rbx movq %rax, %rbx /* Remember new virtual address */
/* mov imm64, %rax */ MOV_IMM64_RAX(grub_relocator_xen_remapper_map)
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator_xen_remapper_map)
.quad 0
movq %rax, %rsi movq %rax, %rsi /* %rsi: page table entry */
movq $2, %rdx movq $UVMF_INVLPG, %rdx /* %rdx: flags (inv. single entry) */
movq $__HYPERVISOR_update_va_mapping, %rax movq $__HYPERVISOR_update_va_mapping, %rax
syscall syscall /* Do the remap operation */
addq $(LOCAL(cont) - LOCAL(base)), %rbx addq $(LOCAL(cont) - LOCAL(base)), %rbx
jmp *%rbx jmp *%rbx /* Continue with new virtual address */
LOCAL(cont): LOCAL(cont):
/* Modify mappings of new page tables to be read-only. */
/* mov imm64, %rcx */ MOV_IMM64_RAX(grub_relocator_xen_mfn_list)
.byte 0x48
.byte 0xb9
VARIABLE(grub_relocator_xen_paging_size)
.quad 0
/* mov imm64, %rax */ movq %rax, %rbx /* %rbx is the base of the p2m list */
.byte 0x48 leaq EXT_C(grub_relocator_xen_paging_areas) (%rip), %r8
.byte 0xb8
VARIABLE(grub_relocator_xen_paging_start)
.quad 0
movq %rax, %r12
/* mov imm64, %rax */
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator_xen_mfn_list)
.quad 0
movq %rax, %rsi
1: 1:
movq 0(%r8), %r12 /* Get start pfn of the current area */
movq GRUB_TARGET_SIZEOF_LONG(%r8), %rcx /* Get # of pg tables */
testq %rcx, %rcx /* 0 -> last area reached */
jz 3f
2:
movq %r12, %rdi movq %r12, %rdi
movq %rsi, %rbx shlq $PAGE_SHIFT, %rdi /* virtual address (1:1 mapping) */
movq 0(%rsi), %rsi movq (%rbx, %r12, 8), %rsi /* mfn */
shlq $12, %rsi shlq $PAGE_SHIFT, %rsi
orq $5, %rsi orq $(GRUB_PAGE_PRESENT | GRUB_PAGE_USER), %rsi /* Build pte */
movq $2, %rdx movq $UVMF_INVLPG, %rdx
movq %rcx, %r9 movq %rcx, %r9 /* %rcx clobbered by hypercall */
movq $__HYPERVISOR_update_va_mapping, %rax movq $__HYPERVISOR_update_va_mapping, %rax
syscall syscall
movq %r9, %rcx movq %r9, %rcx
addq $8, %rbx incq %r12 /* next pfn */
addq $4096, %r12
movq %rbx, %rsi
loop 1b loop 2b
leaq LOCAL(mmu_op) (%rip), %rdi addq $(2 * GRUB_TARGET_SIZEOF_LONG), %r8 /* next pg table area */
movq $3, %rsi jmp 1b
movq $0, %rdx
movq $0x7FF0, %r10 3:
/* Switch page tables: pin new L4 pt, load cr3, unpin old L4. */
leaq EXT_C(grub_relocator_xen_mmu_op) (%rip), %rdi
movq $3, %rsi /* 3 mmu ops */
movq $0, %rdx /* pdone (not used) */
movq $DOMID_SELF, %r10
movq $__HYPERVISOR_mmuext_op, %rax movq $__HYPERVISOR_mmuext_op, %rax
syscall syscall
/* mov imm64, %rax */ /* Continue in virtual kernel mapping. */
.byte 0x48 MOV_IMM64_RAX(grub_relocator_xen_remap_continue)
.byte 0xb8
VARIABLE(grub_relocator_xen_remap_continue)
.quad 0
jmp *%rax jmp *%rax
LOCAL(mmu_op): VARIABLE(grub_relocator_xen_paging_areas)
/* array of start, size pairs, size 0 is end marker */
.quad 0, 0, 0, 0, 0, 0, 0, 0
VARIABLE(grub_relocator_xen_mmu_op) VARIABLE(grub_relocator_xen_mmu_op)
.space 256 .space 256
@ -112,46 +102,32 @@ VARIABLE(grub_relocator_xen_remap_end)
VARIABLE(grub_relocator_xen_start) VARIABLE(grub_relocator_xen_start)
/* mov imm64, %rax */ /* Unmap old remapper area. */
.byte 0x48 MOV_IMM64_RAX(grub_relocator_xen_remapper_virt2)
.byte 0xb8
VARIABLE(grub_relocator_xen_remapper_virt2)
.quad 0
movq %rax, %rdi movq %rax, %rdi
xorq %rax, %rax xorq %rax, %rax /* Invalid pte */
movq %rax, %rsi movq %rax, %rsi
movq $2, %rdx movq $UVMF_INVLPG, %rdx
movq $__HYPERVISOR_update_va_mapping, %rax movq $__HYPERVISOR_update_va_mapping, %rax
syscall syscall
/* Prepare registers for starting kernel. */
/* mov imm64, %rax */ MOV_IMM64_RAX(grub_relocator_xen_stack)
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator_xen_stack)
.quad 0
movq %rax, %rsp movq %rax, %rsp
/* mov imm64, %rax */ MOV_IMM64_RAX(grub_relocator_xen_start_info)
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator_xen_start_info)
.quad 0
movq %rax, %rsi movq %rax, %rsi
cld cld
/* mov imm64, %rax */ MOV_IMM64_RAX(grub_relocator_xen_entry_point)
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator_xen_entry_point)
.quad 0
/* Now start the new kernel. */
jmp *%rax jmp *%rax
VARIABLE(grub_relocator_xen_end) VARIABLE(grub_relocator_xen_end)

28
grub-core/lib/xen/relocator.c
View file

@ -29,6 +29,11 @@
typedef grub_addr_t grub_xen_reg_t; typedef grub_addr_t grub_xen_reg_t;
struct grub_relocator_xen_paging_area {
grub_xen_reg_t start;
grub_xen_reg_t size;
} GRUB_PACKED;
extern grub_uint8_t grub_relocator_xen_start; extern grub_uint8_t grub_relocator_xen_start;
extern grub_uint8_t grub_relocator_xen_end; extern grub_uint8_t grub_relocator_xen_end;
extern grub_uint8_t grub_relocator_xen_remap_start; extern grub_uint8_t grub_relocator_xen_remap_start;
@ -36,15 +41,16 @@ extern grub_uint8_t grub_relocator_xen_remap_end;
extern grub_xen_reg_t grub_relocator_xen_stack; extern grub_xen_reg_t grub_relocator_xen_stack;
extern grub_xen_reg_t grub_relocator_xen_start_info; extern grub_xen_reg_t grub_relocator_xen_start_info;
extern grub_xen_reg_t grub_relocator_xen_entry_point; extern grub_xen_reg_t grub_relocator_xen_entry_point;
extern grub_xen_reg_t grub_relocator_xen_paging_start;
extern grub_xen_reg_t grub_relocator_xen_paging_size;
extern grub_xen_reg_t grub_relocator_xen_remapper_virt; extern grub_xen_reg_t grub_relocator_xen_remapper_virt;
extern grub_xen_reg_t grub_relocator_xen_remapper_virt2; extern grub_xen_reg_t grub_relocator_xen_remapper_virt2;
extern grub_xen_reg_t grub_relocator_xen_remapper_map; extern grub_xen_reg_t grub_relocator_xen_remapper_map;
extern grub_xen_reg_t grub_relocator_xen_mfn_list; extern grub_xen_reg_t grub_relocator_xen_mfn_list;
extern struct grub_relocator_xen_paging_area
grub_relocator_xen_paging_areas[XEN_MAX_MAPPINGS];
extern grub_xen_reg_t grub_relocator_xen_remap_continue; extern grub_xen_reg_t grub_relocator_xen_remap_continue;
#ifdef __i386__ #ifdef __i386__
extern grub_xen_reg_t grub_relocator_xen_mmu_op_addr; extern grub_xen_reg_t grub_relocator_xen_mmu_op_addr;
extern grub_xen_reg_t grub_relocator_xen_paging_areas_addr;
extern grub_xen_reg_t grub_relocator_xen_remapper_map_high; extern grub_xen_reg_t grub_relocator_xen_remapper_map_high;
#endif #endif
extern mmuext_op_t grub_relocator_xen_mmu_op[3]; extern mmuext_op_t grub_relocator_xen_mmu_op[3];
@ -61,6 +67,7 @@ grub_relocator_xen_boot (struct grub_relocator *rel,
{ {
grub_err_t err; grub_err_t err;
void *relst; void *relst;
int i;
grub_relocator_chunk_t ch, ch_tramp; grub_relocator_chunk_t ch, ch_tramp;
grub_xen_mfn_t *mfn_list = grub_xen_mfn_t *mfn_list =
(grub_xen_mfn_t *) grub_xen_start_page_addr->mfn_list; (grub_xen_mfn_t *) grub_xen_start_page_addr->mfn_list;
@ -77,8 +84,11 @@ grub_relocator_xen_boot (struct grub_relocator *rel,
grub_relocator_xen_stack = state.stack; grub_relocator_xen_stack = state.stack;
grub_relocator_xen_start_info = state.start_info; grub_relocator_xen_start_info = state.start_info;
grub_relocator_xen_entry_point = state.entry_point; grub_relocator_xen_entry_point = state.entry_point;
grub_relocator_xen_paging_start = state.paging_start << 12; for (i = 0; i < XEN_MAX_MAPPINGS; i++)
grub_relocator_xen_paging_size = state.paging_size; {
grub_relocator_xen_paging_areas[i].start = state.paging_start[i];
grub_relocator_xen_paging_areas[i].size = state.paging_size[i];
}
grub_relocator_xen_remapper_virt = remapper_virt; grub_relocator_xen_remapper_virt = remapper_virt;
grub_relocator_xen_remapper_virt2 = remapper_virt; grub_relocator_xen_remapper_virt2 = remapper_virt;
grub_relocator_xen_remap_continue = trampoline_virt; grub_relocator_xen_remap_continue = trampoline_virt;
@ -88,10 +98,12 @@ grub_relocator_xen_boot (struct grub_relocator *rel,
grub_relocator_xen_remapper_map_high = (mfn_list[remapper_pfn] >> 20); grub_relocator_xen_remapper_map_high = (mfn_list[remapper_pfn] >> 20);
grub_relocator_xen_mmu_op_addr = (char *) &grub_relocator_xen_mmu_op grub_relocator_xen_mmu_op_addr = (char *) &grub_relocator_xen_mmu_op
- (char *) &grub_relocator_xen_remap_start + remapper_virt; - (char *) &grub_relocator_xen_remap_start + remapper_virt;
grub_relocator_xen_paging_areas_addr =
(char *) &grub_relocator_xen_paging_areas
- (char *) &grub_relocator_xen_remap_start + remapper_virt;
#endif #endif
grub_relocator_xen_mfn_list = state.mfn_list grub_relocator_xen_mfn_list = state.mfn_list;
+ state.paging_start * sizeof (grub_addr_t);
grub_memset (grub_relocator_xen_mmu_op, 0, grub_memset (grub_relocator_xen_mmu_op, 0,
sizeof (grub_relocator_xen_mmu_op)); sizeof (grub_relocator_xen_mmu_op));
@ -100,9 +112,9 @@ grub_relocator_xen_boot (struct grub_relocator *rel,
#else #else
grub_relocator_xen_mmu_op[0].cmd = MMUEXT_PIN_L4_TABLE; grub_relocator_xen_mmu_op[0].cmd = MMUEXT_PIN_L4_TABLE;
#endif #endif
grub_relocator_xen_mmu_op[0].arg1.mfn = mfn_list[state.paging_start]; grub_relocator_xen_mmu_op[0].arg1.mfn = mfn_list[state.paging_start[0]];
grub_relocator_xen_mmu_op[1].cmd = MMUEXT_NEW_BASEPTR; grub_relocator_xen_mmu_op[1].cmd = MMUEXT_NEW_BASEPTR;
grub_relocator_xen_mmu_op[1].arg1.mfn = mfn_list[state.paging_start]; grub_relocator_xen_mmu_op[1].arg1.mfn = mfn_list[state.paging_start[0]];
grub_relocator_xen_mmu_op[2].cmd = MMUEXT_UNPIN_TABLE; grub_relocator_xen_mmu_op[2].cmd = MMUEXT_UNPIN_TABLE;
grub_relocator_xen_mmu_op[2].arg1.mfn = grub_relocator_xen_mmu_op[2].arg1.mfn =
mfn_list[grub_xen_start_page_addr->pt_base >> 12]; mfn_list[grub_xen_start_page_addr->pt_base >> 12];

329
grub-core/loader/i386/xen.c
View file

@ -39,9 +39,34 @@
#include <grub/xen.h> #include <grub/xen.h>
#include <grub/xen_file.h> #include <grub/xen_file.h>
#include <grub/linux.h> #include <grub/linux.h>
#include <grub/i386/memory.h>
GRUB_MOD_LICENSE ("GPLv3+"); GRUB_MOD_LICENSE ("GPLv3+");
#ifdef __x86_64__
#define NUMBER_OF_LEVELS 4
#define INTERMEDIATE_OR (GRUB_PAGE_PRESENT | GRUB_PAGE_RW | GRUB_PAGE_USER)
#define VIRT_MASK 0x0000ffffffffffffULL
#else
#define NUMBER_OF_LEVELS 3
#define INTERMEDIATE_OR (GRUB_PAGE_PRESENT | GRUB_PAGE_RW)
#define VIRT_MASK 0x00000000ffffffffULL
#define HYPERVISOR_PUD_ADDRESS 0xc0000000ULL
#endif
struct grub_xen_mapping_lvl {
grub_uint64_t virt_start;
grub_uint64_t virt_end;
grub_uint64_t pfn_start;
grub_uint64_t n_pt_pages;
};
struct grub_xen_mapping {
grub_uint64_t *where;
struct grub_xen_mapping_lvl area;
struct grub_xen_mapping_lvl lvls[NUMBER_OF_LEVELS];
};
struct xen_loader_state { struct xen_loader_state {
struct grub_relocator *relocator; struct grub_relocator *relocator;
struct grub_relocator_xen_state state; struct grub_relocator_xen_state state;
@ -51,12 +76,13 @@ struct xen_loader_state {
struct start_info *virt_start_info; struct start_info *virt_start_info;
grub_xen_mfn_t console_pfn; grub_xen_mfn_t console_pfn;
grub_uint64_t max_addr; grub_uint64_t max_addr;
grub_uint64_t *virt_pgtable;
grub_uint64_t pgtbl_start;
grub_uint64_t pgtbl_end; grub_uint64_t pgtbl_end;
struct xen_multiboot_mod_list *module_info_page; struct xen_multiboot_mod_list *module_info_page;
grub_uint64_t modules_target_start; grub_uint64_t modules_target_start;
grub_size_t n_modules; grub_size_t n_modules;
struct grub_xen_mapping *map_reloc;
struct grub_xen_mapping mappings[XEN_MAX_MAPPINGS];
int n_mappings;
int loaded; int loaded;
}; };
@ -64,9 +90,8 @@ static struct xen_loader_state xen_state;
static grub_dl_t my_mod; static grub_dl_t my_mod;
#define PAGE_SIZE 4096 #define PAGE_SIZE (1UL << PAGE_SHIFT)
#define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list)) #define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list))
#define PAGE_SHIFT 12
#define STACK_SIZE 1048576 #define STACK_SIZE 1048576
#define ADDITIONAL_SIZE (1 << 19) #define ADDITIONAL_SIZE (1 << 19)
#define ALIGN_SIZE (1 << 22) #define ALIGN_SIZE (1 << 22)
@ -79,100 +104,163 @@ page2offset (grub_uint64_t page)
return page << PAGE_SHIFT; return page << PAGE_SHIFT;
} }
#ifdef __x86_64__ static grub_err_t
#define NUMBER_OF_LEVELS 4 get_pgtable_size (grub_uint64_t from, grub_uint64_t to, grub_uint64_t pfn)
#define INTERMEDIATE_OR 7 {
#else struct grub_xen_mapping *map, *map_cmp;
#define NUMBER_OF_LEVELS 3 grub_uint64_t mask, bits;
#define INTERMEDIATE_OR 3 int i, m;
if (xen_state.n_mappings == XEN_MAX_MAPPINGS)
return grub_error (GRUB_ERR_BUG, "too many mapped areas");
grub_dprintf ("xen", "get_pgtable_size %d from=%llx, to=%llx, pfn=%llx\n",
xen_state.n_mappings, (unsigned long long) from,
(unsigned long long) to, (unsigned long long) pfn);
map = xen_state.mappings + xen_state.n_mappings;
grub_memset (map, 0, sizeof (*map));
map->area.virt_start = from & VIRT_MASK;
map->area.virt_end = (to - 1) & VIRT_MASK;
map->area.n_pt_pages = 0;
for (i = NUMBER_OF_LEVELS - 1; i >= 0; i--)
{
map->lvls[i].pfn_start = pfn + map->area.n_pt_pages;
if (i == NUMBER_OF_LEVELS - 1)
{
if (xen_state.n_mappings == 0)
{
map->lvls[i].virt_start = 0;
map->lvls[i].virt_end = VIRT_MASK;
map->lvls[i].n_pt_pages = 1;
map->area.n_pt_pages++;
}
continue;
}
bits = PAGE_SHIFT + (i + 1) * LOG_POINTERS_PER_PAGE;
mask = (1ULL << bits) - 1;
map->lvls[i].virt_start = map->area.virt_start & ~mask;
map->lvls[i].virt_end = map->area.virt_end | mask;
#ifdef __i386__
/* PAE wants last root directory present. */
if (i == 1 && to <= HYPERVISOR_PUD_ADDRESS && xen_state.n_mappings == 0)
map->lvls[i].virt_end = VIRT_MASK;
#endif #endif
for (m = 0; m < xen_state.n_mappings; m++)
{
map_cmp = xen_state.mappings + m;
if (map_cmp->lvls[i].virt_start == map_cmp->lvls[i].virt_end)
continue;
if (map->lvls[i].virt_start >= map_cmp->lvls[i].virt_start &&
map->lvls[i].virt_end <= map_cmp->lvls[i].virt_end)
{
map->lvls[i].virt_start = 0;
map->lvls[i].virt_end = 0;
break;
}
if (map->lvls[i].virt_start >= map_cmp->lvls[i].virt_start &&
map->lvls[i].virt_start <= map_cmp->lvls[i].virt_end)
map->lvls[i].virt_start = map_cmp->lvls[i].virt_end + 1;
if (map->lvls[i].virt_end >= map_cmp->lvls[i].virt_start &&
map->lvls[i].virt_end <= map_cmp->lvls[i].virt_end)
map->lvls[i].virt_end = map_cmp->lvls[i].virt_start - 1;
}
if (map->lvls[i].virt_start < map->lvls[i].virt_end)
map->lvls[i].n_pt_pages =
((map->lvls[i].virt_end - map->lvls[i].virt_start) >> bits) + 1;
map->area.n_pt_pages += map->lvls[i].n_pt_pages;
grub_dprintf ("xen", "get_pgtable_size level %d: virt %llx-%llx %d pts\n",
i, (unsigned long long) map->lvls[i].virt_start,
(unsigned long long) map->lvls[i].virt_end,
(int) map->lvls[i].n_pt_pages);
}
grub_dprintf ("xen", "get_pgtable_size return: %d page tables\n",
(int) map->area.n_pt_pages);
xen_state.state.paging_start[xen_state.n_mappings] = pfn;
xen_state.state.paging_size[xen_state.n_mappings] = map->area.n_pt_pages;
return GRUB_ERR_NONE;
}
static grub_uint64_t *
get_pg_table_virt (int mapping, int level)
{
grub_uint64_t pfn;
struct grub_xen_mapping *map;
map = xen_state.mappings + mapping;
pfn = map->lvls[level].pfn_start - map->lvls[NUMBER_OF_LEVELS - 1].pfn_start;
return map->where + pfn * POINTERS_PER_PAGE;
}
static grub_uint64_t static grub_uint64_t
get_pgtable_size (grub_uint64_t total_pages, grub_uint64_t virt_base) get_pg_table_prot (int level, grub_uint64_t pfn)
{ {
if (!virt_base) int m;
total_pages++; grub_uint64_t pfn_s, pfn_e;
grub_uint64_t ret = 0;
grub_uint64_t ll = total_pages; if (level > 0)
int i; return INTERMEDIATE_OR;
for (i = 0; i < NUMBER_OF_LEVELS; i++) for (m = 0; m < xen_state.n_mappings; m++)
{ {
ll = (ll + POINTERS_PER_PAGE - 1) >> LOG_POINTERS_PER_PAGE; pfn_s = xen_state.mappings[m].lvls[NUMBER_OF_LEVELS - 1].pfn_start;
/* PAE wants all 4 root directories present. */ pfn_e = xen_state.mappings[m].area.n_pt_pages + pfn_s;
#ifdef __i386__ if (pfn >= pfn_s && pfn < pfn_e)
if (i == 1) return GRUB_PAGE_PRESENT | GRUB_PAGE_USER;
ll = 4;
#endif
ret += ll;
} }
for (i = 1; i < NUMBER_OF_LEVELS; i++) return GRUB_PAGE_PRESENT | GRUB_PAGE_RW | GRUB_PAGE_USER;
if (virt_base >> (PAGE_SHIFT + i * LOG_POINTERS_PER_PAGE))
ret++;
return ret;
} }
static void static void
generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start, generate_page_table (grub_xen_mfn_t *mfn_list)
grub_uint64_t paging_end, grub_uint64_t total_pages,
grub_uint64_t virt_base, grub_xen_mfn_t *mfn_list)
{ {
if (!virt_base) int l, m1, m2;
paging_end++; long p, p_s, p_e;
grub_uint64_t start, end, pfn;
grub_uint64_t *pg;
struct grub_xen_mapping_lvl *lvl;
grub_uint64_t lx[NUMBER_OF_LEVELS], lxs[NUMBER_OF_LEVELS]; for (m1 = 0; m1 < xen_state.n_mappings; m1++)
grub_uint64_t nlx, nls, sz = 0; grub_memset (xen_state.mappings[m1].where, 0,
int l; xen_state.mappings[m1].area.n_pt_pages * PAGE_SIZE);
nlx = paging_end; for (l = NUMBER_OF_LEVELS - 1; l >= 0; l--)
nls = virt_base >> PAGE_SHIFT;
for (l = 0; l < NUMBER_OF_LEVELS; l++)
{ {
nlx = (nlx + POINTERS_PER_PAGE - 1) >> LOG_POINTERS_PER_PAGE; for (m1 = 0; m1 < xen_state.n_mappings; m1++)
/* PAE wants all 4 root directories present. */ {
#ifdef __i386__ start = xen_state.mappings[m1].lvls[l].virt_start;
if (l == 1) end = xen_state.mappings[m1].lvls[l].virt_end;
nlx = 4; pg = get_pg_table_virt(m1, l);
#endif for (m2 = 0; m2 < xen_state.n_mappings; m2++)
lx[l] = nlx; {
sz += lx[l]; lvl = (l > 0) ? xen_state.mappings[m2].lvls + l - 1
lxs[l] = nls & (POINTERS_PER_PAGE - 1); : &xen_state.mappings[m2].area;
if (nls && l != 0) if (l > 0 && lvl->n_pt_pages == 0)
sz++; continue;
nls >>= LOG_POINTERS_PER_PAGE; if (lvl->virt_start >= end || lvl->virt_end <= start)
} continue;
p_s = (grub_max (start, lvl->virt_start) - start) >>
grub_uint64_t lp; (PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE);
grub_uint64_t j; p_e = (grub_min (end, lvl->virt_end) - start) >>
grub_uint64_t *pg = (grub_uint64_t *) where; (PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE);
int pr = 0; pfn = ((grub_max (start, lvl->virt_start) - lvl->virt_start) >>
(PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE)) + lvl->pfn_start;
grub_memset (pg, 0, sz * PAGE_SIZE); grub_dprintf ("xen", "write page table entries level %d pg %p "
"mapping %d/%d index %lx-%lx pfn %llx\n",
lp = paging_start + lx[NUMBER_OF_LEVELS - 1]; l, pg, m1, m2, p_s, p_e, (unsigned long long) pfn);
for (l = NUMBER_OF_LEVELS - 1; l >= 1; l--) for (p = p_s; p <= p_e; p++)
{ {
if (lxs[l] || pr) pg[p] = page2offset (mfn_list[pfn]) |
pg[0] = page2offset (mfn_list[lp++]) | INTERMEDIATE_OR; get_pg_table_prot (l, pfn);
if (pr) pfn++;
pg += POINTERS_PER_PAGE; }
for (j = 0; j < lx[l - 1]; j++) }
pg[j + lxs[l]] = page2offset (mfn_list[lp++]) | INTERMEDIATE_OR; }
pg += lx[l] * POINTERS_PER_PAGE;
if (lxs[l])
pr = 1;
}
if (lxs[0] || pr)
pg[0] = page2offset (mfn_list[total_pages]) | 5;
if (pr)
pg += POINTERS_PER_PAGE;
for (j = 0; j < paging_end; j++)
{
if (j >= paging_start && j < lp)
pg[j + lxs[0]] = page2offset (mfn_list[j]) | 5;
else
pg[j + lxs[0]] = page2offset (mfn_list[j]) | 7;
} }
} }
@ -285,45 +373,71 @@ grub_xen_pt_alloc (void)
grub_relocator_chunk_t ch; grub_relocator_chunk_t ch;
grub_err_t err; grub_err_t err;
grub_uint64_t nr_info_pages; grub_uint64_t nr_info_pages;
grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages; grub_uint64_t nr_need_pages;
grub_uint64_t try_virt_end;
struct grub_xen_mapping *map;
if (xen_state.virt_pgtable) if (xen_state.pgtbl_end)
return GRUB_ERR_NONE; return GRUB_ERR_NONE;
map = xen_state.mappings + xen_state.n_mappings;
xen_state.map_reloc = map + 1;
xen_state.next_start.pt_base = xen_state.next_start.pt_base =
xen_state.max_addr + xen_state.xen_inf.virt_base; xen_state.max_addr + xen_state.xen_inf.virt_base;
xen_state.state.paging_start = xen_state.max_addr >> PAGE_SHIFT;
nr_info_pages = xen_state.max_addr >> PAGE_SHIFT; nr_info_pages = xen_state.max_addr >> PAGE_SHIFT;
nr_pages = nr_info_pages; nr_need_pages = nr_info_pages;
while (1) while (1)
{ {
nr_pages = ALIGN_UP (nr_pages, (ALIGN_SIZE >> PAGE_SHIFT)); try_virt_end = ALIGN_UP (xen_state.xen_inf.virt_base +
nr_pt_pages = get_pgtable_size (nr_pages, xen_state.xen_inf.virt_base); page2offset (nr_need_pages) +
nr_need_pages = ADDITIONAL_SIZE + STACK_SIZE, ALIGN_SIZE);
nr_info_pages + nr_pt_pages + if (!xen_state.xen_inf.virt_base)
((ADDITIONAL_SIZE + STACK_SIZE) >> PAGE_SHIFT); try_virt_end += PAGE_SIZE;
if (nr_pages >= nr_need_pages)
err = get_pgtable_size (xen_state.xen_inf.virt_base, try_virt_end,
nr_info_pages);
if (err)
return err;
xen_state.n_mappings++;
/* Map the relocator page either at virtual 0 or after end of area. */
nr_need_pages = nr_info_pages + map->area.n_pt_pages;
if (xen_state.xen_inf.virt_base)
err = get_pgtable_size (0, PAGE_SIZE, nr_need_pages);
else
err = get_pgtable_size (try_virt_end - PAGE_SIZE, try_virt_end,
nr_need_pages);
if (err)
return err;
nr_need_pages += xen_state.map_reloc->area.n_pt_pages;
if (xen_state.xen_inf.virt_base + page2offset (nr_need_pages) <=
try_virt_end)
break; break;
nr_pages = nr_need_pages;
xen_state.n_mappings--;
} }
xen_state.n_mappings++;
nr_need_pages = map->area.n_pt_pages + xen_state.map_reloc->area.n_pt_pages;
err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch,
xen_state.max_addr, xen_state.max_addr,
page2offset (nr_pt_pages)); page2offset (nr_need_pages));
if (err) if (err)
return err; return err;
xen_state.virt_pgtable = get_virtual_current_address (ch); map->where = get_virtual_current_address (ch);
xen_state.pgtbl_start = xen_state.max_addr >> PAGE_SHIFT; map->area.pfn_start = 0;
xen_state.max_addr += page2offset (nr_pt_pages); xen_state.max_addr += page2offset (nr_need_pages);
xen_state.state.stack = xen_state.state.stack =
xen_state.max_addr + STACK_SIZE + xen_state.xen_inf.virt_base; xen_state.max_addr + STACK_SIZE + xen_state.xen_inf.virt_base;
xen_state.state.paging_size = nr_pt_pages; xen_state.next_start.nr_pt_frames = nr_need_pages;
xen_state.next_start.nr_pt_frames = nr_pt_pages; xen_state.max_addr = try_virt_end - xen_state.xen_inf.virt_base;
xen_state.max_addr = page2offset (nr_pages); xen_state.pgtbl_end = xen_state.max_addr >> PAGE_SHIFT;
xen_state.pgtbl_end = nr_pages; xen_state.map_reloc->where = (grub_uint64_t *) ((char *) map->where +
page2offset (map->area.n_pt_pages));
return GRUB_ERR_NONE; return GRUB_ERR_NONE;
} }
@ -372,9 +486,8 @@ grub_xen_boot (void)
(unsigned long long) xen_state.xen_inf.virt_base, (unsigned long long) xen_state.xen_inf.virt_base,
(unsigned long long) page2offset (nr_pages)); (unsigned long long) page2offset (nr_pages));
generate_page_table (xen_state.virt_pgtable, xen_state.pgtbl_start, xen_state.map_reloc->area.pfn_start = nr_pages;
xen_state.pgtbl_end, nr_pages, generate_page_table (xen_state.virt_mfn_list);
xen_state.xen_inf.virt_base, xen_state.virt_mfn_list);
xen_state.state.entry_point = xen_state.xen_inf.entry_point; xen_state.state.entry_point = xen_state.xen_inf.entry_point;

7
include/grub/i386/memory.h
View file

@ -20,6 +20,8 @@
#ifndef GRUB_MEMORY_CPU_HEADER #ifndef GRUB_MEMORY_CPU_HEADER
#define GRUB_MEMORY_CPU_HEADER 1 #define GRUB_MEMORY_CPU_HEADER 1
#define PAGE_SHIFT 12
/* The flag for protected mode. */ /* The flag for protected mode. */
#define GRUB_MEMORY_CPU_CR0_PE_ON 0x1 #define GRUB_MEMORY_CPU_CR0_PE_ON 0x1
#define GRUB_MEMORY_CPU_CR4_PAE_ON 0x00000020 #define GRUB_MEMORY_CPU_CR4_PAE_ON 0x00000020
@ -31,6 +33,11 @@
#define GRUB_MEMORY_MACHINE_UPPER_START 0x100000 /* 1 MiB */ #define GRUB_MEMORY_MACHINE_UPPER_START 0x100000 /* 1 MiB */
#define GRUB_MEMORY_MACHINE_LOWER_SIZE GRUB_MEMORY_MACHINE_UPPER_START #define GRUB_MEMORY_MACHINE_LOWER_SIZE GRUB_MEMORY_MACHINE_UPPER_START
/* Some PTE definitions. */
#define GRUB_PAGE_PRESENT 0x00000001
#define GRUB_PAGE_RW 0x00000002
#define GRUB_PAGE_USER 0x00000004
#ifndef ASM_FILE #ifndef ASM_FILE
#define GRUB_MMAP_MALLOC_LOW 1 #define GRUB_MMAP_MALLOC_LOW 1

6
include/grub/xen/relocator.h
View file

@ -23,11 +23,13 @@
#include <grub/err.h> #include <grub/err.h>
#include <grub/relocator.h> #include <grub/relocator.h>
#define XEN_MAX_MAPPINGS 3
struct grub_relocator_xen_state struct grub_relocator_xen_state
{ {
grub_addr_t start_info; grub_addr_t start_info;
grub_addr_t paging_start; grub_addr_t paging_start[XEN_MAX_MAPPINGS];
grub_addr_t paging_size; grub_addr_t paging_size[XEN_MAX_MAPPINGS];
grub_addr_t mfn_list; grub_addr_t mfn_list;
grub_addr_t stack; grub_addr_t stack;
grub_addr_t entry_point; grub_addr_t entry_point;