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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Indirect hypercalls through a hypercall transfer page.
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 71914b64b5770285cf095c1906e346b814f4878b
# Parent 246b6444c6432193ea98c9f01de58e6740bde09c
Indirect hypercalls through a hypercall transfer page.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r 246b6444c643 -r 71914b64b577
linux-2.6-xen-sparse/arch/xen/i386/kernel/entry.S
--- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/entry.S Tue Jan 24 16:59:54 2006
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/entry.S Tue Jan 24 17:05:45 2006
@@ -333,10 +333,8 @@
hypervisor_iret:
andl $~NMI_MASK, EFLAGS(%esp)
RESTORE_REGS
- movl %eax,(%esp)
- movl $__HYPERVISOR_iret,%eax
- int $0x82
- ud2
+ addl $4, %esp
+ jmp hypercall_page + (__HYPERVISOR_iret * 32)
#if 0 /* XEN */
ldt_ss:
diff -r 246b6444c643 -r 71914b64b577
linux-2.6-xen-sparse/arch/xen/i386/kernel/head.S
--- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/head.S Tue Jan 24 16:59:54 2006
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/head.S Tue Jan 24 17:05:45 2006
@@ -5,6 +5,7 @@
.ascii "GUEST_OS=linux,GUEST_VER=2.6"
.ascii ",XEN_VER=xen-3.0"
.ascii ",VIRT_BASE=0xC0000000"
+ .ascii ",HYPERCALL_PAGE=0x104" /* __pa(hypercall_page) >> 12 */
#ifdef CONFIG_X86_PAE
.ascii ",PAE=yes"
#else
@@ -187,6 +188,9 @@
ENTRY(default_ldt)
.org 0x4000
+ENTRY(hypercall_page)
+
+.org 0x5000
/*
* Real beginning of normal "text" segment
*/
diff -r 246b6444c643 -r 71914b64b577
linux-2.6-xen-sparse/arch/xen/x86_64/kernel/entry.S
--- a/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/entry.S Tue Jan 24
16:59:54 2006
+++ b/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/entry.S Tue Jan 24
17:05:45 2006
@@ -127,15 +127,10 @@
* };
* #define VGCF_IN_SYSCALL (1<<8)
*/
- .macro HYPERVISOR_IRET flag
- subq $8*4,%rsp # reuse rip, cs, rflags, rsp, ss in
the stack
- movq %rax,(%rsp)
- movq %r11,1*8(%rsp)
- movq %rcx,2*8(%rsp) # we saved %rcx upon exceptions
- movq $\flag,3*8(%rsp)
- movq $__HYPERVISOR_iret,%rax
- syscall
- .endm
+ .macro HYPERVISOR_IRET flag
+ pushq $\flag
+ jmp hypercall_page + (__HYPERVISOR_iret * 32)
+ .endm
.macro SWITCH_TO_KERNEL ssoff,adjust=0
jc 1f
diff -r 246b6444c643 -r 71914b64b577
linux-2.6-xen-sparse/arch/xen/x86_64/kernel/head.S
--- a/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/head.S Tue Jan 24
16:59:54 2006
+++ b/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/head.S Tue Jan 24
17:05:45 2006
@@ -16,9 +16,11 @@
#include <linux/linkage.h>
.section __xen_guest
- .ascii
"GUEST_OS=linux,GUEST_VER=2.6,XEN_VER=xen-3.0,VIRT_BASE=0xffffffff80000000"
+ .ascii "GUEST_OS=linux,GUEST_VER=2.6"
+ .ascii ",XEN_VER=xen-3.0"
+ .ascii ",VIRT_BASE=0xffffffff80000000"
+ .ascii ",HYPERCALL_PAGE=0x10d" /* __pa(hypercall_page) >> 12 */
.ascii ",LOADER=generic"
-/* .ascii ",PT_MODE_WRITABLE" */
.byte 0
@@ -227,8 +229,10 @@
ENTRY(level3_physmem_pgt)
.quad 0x0000000000105007 /* -> level2_kernel_pgt (so
that __va works even before pagetable_init) */
-
- .org 0xd000
+.org 0xd000
+ENTRY(hypercall_page)
+
+.org 0xe000
#ifdef CONFIG_ACPI_SLEEP
ENTRY(wakeup_level4_pgt)
.quad 0x0000000000102007 /* -> level3_ident_pgt */
diff -r 246b6444c643 -r 71914b64b577
linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c
--- a/linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c Tue Jan 24
16:59:54 2006
+++ b/linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c Tue Jan 24
17:05:45 2006
@@ -58,7 +58,9 @@
"movl 16(%%eax),%%esi ;"
"movl 20(%%eax),%%edi ;"
"movl (%%eax),%%eax ;"
- TRAP_INSTR "; "
+ "shll $5,%%eax ;"
+ "addl $hypercall_page,%%eax ;"
+ "call *%%eax ;"
"popl %%edi; popl %%esi; popl %%edx; "
"popl %%ecx; popl %%ebx"
: "=a" (ret) : "0" (&hypercall) : "memory" );
@@ -66,7 +68,10 @@
{
long ign1, ign2, ign3;
__asm__ __volatile__ (
- "movq %8,%%r10; movq %9,%%r8;" TRAP_INSTR
+ "movq %8,%%r10; movq %9,%%r8;"
+ "shlq $5,%%rax ;"
+ "addq $hypercall_page,%%rax ;"
+ "call *%%rax"
: "=a" (ret), "=D" (ign1),
"=S" (ign2), "=d" (ign3)
: "0" ((unsigned long)hypercall.op),
@@ -75,7 +80,7 @@
"3" ((unsigned long)hypercall.arg[2]),
"g" ((unsigned long)hypercall.arg[3]),
"g" ((unsigned long)hypercall.arg[4])
- : "r11","rcx","r8","r10","memory");
+ : "r8", "r10", "memory" );
}
#elif defined (__ia64__)
__asm__ __volatile__ (
diff -r 246b6444c643 -r 71914b64b577
linux-2.6-xen-sparse/include/asm-xen/asm-i386/hypercall.h
--- a/linux-2.6-xen-sparse/include/asm-xen/asm-i386/hypercall.h Tue Jan 24
16:59:54 2006
+++ b/linux-2.6-xen-sparse/include/asm-xen/asm-i386/hypercall.h Tue Jan 24
17:05:45 2006
@@ -34,13 +34,15 @@
#include <asm-xen/xen-public/sched.h>
#include <asm-xen/xen-public/nmi.h>
+#define __STR(x) #x
+#define STR(x) __STR(x)
+
#define _hypercall0(type, name) \
({ \
long __res; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res) \
- : "0" (__HYPERVISOR_##name) \
: "memory" ); \
(type)__res; \
})
@@ -49,9 +51,9 @@
({ \
long __res, __ign1; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=b" (__ign1) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)) \
+ : "1" ((long)(a1)) \
: "memory" ); \
(type)__res; \
})
@@ -60,10 +62,9 @@
({ \
long __res, __ign1, __ign2; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=b" (__ign1), "=c" (__ign2) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)), \
- "2" ((long)(a2)) \
+ : "1" ((long)(a1)), "2" ((long)(a2)) \
: "memory" ); \
(type)__res; \
})
@@ -72,11 +73,11 @@
({ \
long __res, __ign1, __ign2, __ign3; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=b" (__ign1), "=c" (__ign2), \
"=d" (__ign3) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)), \
- "2" ((long)(a2)), "3" ((long)(a3)) \
+ : "1" ((long)(a1)), "2" ((long)(a2)), \
+ "3" ((long)(a3)) \
: "memory" ); \
(type)__res; \
})
@@ -85,12 +86,11 @@
({ \
long __res, __ign1, __ign2, __ign3, __ign4; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=b" (__ign1), "=c" (__ign2), \
"=d" (__ign3), "=S" (__ign4) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)), \
- "2" ((long)(a2)), "3" ((long)(a3)), \
- "4" ((long)(a4)) \
+ : "1" ((long)(a1)), "2" ((long)(a2)), \
+ "3" ((long)(a3)), "4" ((long)(a4)) \
: "memory" ); \
(type)__res; \
})
@@ -99,12 +99,12 @@
({ \
long __res, __ign1, __ign2, __ign3, __ign4, __ign5; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=b" (__ign1), "=c" (__ign2), \
"=d" (__ign3), "=S" (__ign4), "=D" (__ign5) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)), \
- "2" ((long)(a2)), "3" ((long)(a3)), \
- "4" ((long)(a4)), "5" ((long)(a5)) \
+ : "1" ((long)(a1)), "2" ((long)(a2)), \
+ "3" ((long)(a3)), "4" ((long)(a4)), \
+ "5" ((long)(a5)) \
: "memory" ); \
(type)__res; \
})
diff -r 246b6444c643 -r 71914b64b577
linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/hypercall.h
--- a/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/hypercall.h Tue Jan
24 16:59:54 2006
+++ b/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/hypercall.h Tue Jan
24 17:05:45 2006
@@ -37,16 +37,16 @@
#include <asm-xen/xen-public/xen.h>
#include <asm-xen/xen-public/sched.h>
-#define __syscall_clobber "r11","rcx","memory"
+#define __STR(x) #x
+#define STR(x) __STR(x)
#define _hypercall0(type, name) \
({ \
long __res; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res) \
- : "0" (__HYPERVISOR_##name) \
- : __syscall_clobber ); \
+ : "memory" ); \
(type)__res; \
})
@@ -54,10 +54,10 @@
({ \
long __res, __ign1; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=D" (__ign1) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)) \
- : __syscall_clobber ); \
+ : "1" ((long)(a1)) \
+ : "memory" ); \
(type)__res; \
})
@@ -65,11 +65,10 @@
({ \
long __res, __ign1, __ign2; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=D" (__ign1), "=S" (__ign2) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)), \
- "2" ((long)(a2)) \
- : __syscall_clobber ); \
+ : "1" ((long)(a1)), "2" ((long)(a2)) \
+ : "memory" ); \
(type)__res; \
})
@@ -77,12 +76,12 @@
({ \
long __res, __ign1, __ign2, __ign3; \
asm volatile ( \
- TRAP_INSTR \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=D" (__ign1), "=S" (__ign2), \
"=d" (__ign3) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)), \
- "2" ((long)(a2)), "3" ((long)(a3)) \
- : __syscall_clobber ); \
+ : "1" ((long)(a1)), "2" ((long)(a2)), \
+ "3" ((long)(a3)) \
+ : "memory" ); \
(type)__res; \
})
@@ -90,13 +89,13 @@
({ \
long __res, __ign1, __ign2, __ign3; \
asm volatile ( \
- "movq %8,%%r10; " TRAP_INSTR \
+ "movq %8,%%r10; " \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=D" (__ign1), "=S" (__ign2), \
"=d" (__ign3) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)), \
- "2" ((long)(a2)), "3" ((long)(a3)), \
- "g" ((long)(a4)) \
- : __syscall_clobber, "r10" ); \
+ : "1" ((long)(a1)), "2" ((long)(a2)), \
+ "3" ((long)(a3)), "g" ((long)(a4)) \
+ : "memory", "r10" ); \
(type)__res; \
})
@@ -104,13 +103,14 @@
({ \
long __res, __ign1, __ign2, __ign3; \
asm volatile ( \
- "movq %8,%%r10; movq %9,%%r8; " TRAP_INSTR \
+ "movq %8,%%r10; movq %9,%%r8; " \
+ "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
: "=a" (__res), "=D" (__ign1), "=S" (__ign2), \
"=d" (__ign3) \
- : "0" (__HYPERVISOR_##name), "1" ((long)(a1)), \
- "2" ((long)(a2)), "3" ((long)(a3)), \
- "g" ((long)(a4)), "g" ((long)(a5)) \
- : __syscall_clobber, "r10", "r8" ); \
+ : "1" ((long)(a1)), "2" ((long)(a2)), \
+ "3" ((long)(a3)), "g" ((long)(a4)), \
+ "g" ((long)(a5)) \
+ : "memory", "r10", "r8" ); \
(type)__res; \
})
diff -r 246b6444c643 -r 71914b64b577 tools/libxc/xc_linux_build.c
--- a/tools/libxc/xc_linux_build.c Tue Jan 24 16:59:54 2006
+++ b/tools/libxc/xc_linux_build.c Tue Jan 24 17:05:45 2006
@@ -429,10 +429,12 @@
unsigned int console_evtchn, unsigned long *console_mfn)
{
unsigned long *page_array = NULL;
- unsigned long count, i;
+ unsigned long count, i, hypercall_pfn;
start_info_t *start_info;
shared_info_t *shared_info;
xc_mmu_t *mmu = NULL;
+ char *p;
+ DECLARE_DOM0_OP;
int rc;
unsigned long nr_pt_pages;
@@ -714,6 +716,20 @@
/* Send the page update requests down to the hypervisor. */
if ( xc_finish_mmu_updates(xc_handle, mmu) )
goto error_out;
+
+ p = strstr(dsi.xen_guest_string, "HYPERCALL_PAGE=");
+ if ( p != NULL )
+ {
+ p += strlen("HYPERCALL_PAGE=");
+ hypercall_pfn = strtoul(p, NULL, 16);
+ if ( hypercall_pfn >= nr_pages )
+ goto error_out;
+ op.u.hypercall_init.domain = (domid_t)dom;
+ op.u.hypercall_init.mfn = page_array[hypercall_pfn];
+ op.cmd = DOM0_HYPERCALL_INIT;
+ if ( xc_dom0_op(xc_handle, &op) )
+ goto error_out;
+ }
free(mmu);
free(page_array);
diff -r 246b6444c643 -r 71914b64b577 tools/libxc/xc_load_elf.c
--- a/tools/libxc/xc_load_elf.c Tue Jan 24 16:59:54 2006
+++ b/tools/libxc/xc_load_elf.c Tue Jan 24 17:05:45 2006
@@ -120,6 +120,7 @@
break;
}
+
if ( guestinfo == NULL )
{
#ifdef __ia64__
@@ -129,6 +130,8 @@
return -EINVAL;
#endif
}
+
+ dsi->xen_guest_string = guestinfo;
for ( h = 0; h < ehdr->e_phnum; h++ )
{
diff -r 246b6444c643 -r 71914b64b577 tools/libxc/xg_private.h
--- a/tools/libxc/xg_private.h Tue Jan 24 16:59:54 2006
+++ b/tools/libxc/xg_private.h Tue Jan 24 17:05:45 2006
@@ -136,6 +136,9 @@
unsigned int pae_kernel;
unsigned long symtab_addr;
unsigned long symtab_len;
+
+ /* __xen_guest info string for convenient loader parsing. */
+ char *xen_guest_string;
};
typedef int (*parseimagefunc)(char *image, unsigned long image_size,
diff -r 246b6444c643 -r 71914b64b577 xen/arch/x86/dom0_ops.c
--- a/xen/arch/x86/dom0_ops.c Tue Jan 24 16:59:54 2006
+++ b/xen/arch/x86/dom0_ops.c Tue Jan 24 17:05:45 2006
@@ -49,9 +49,6 @@
long arch_do_dom0_op(dom0_op_t *op, dom0_op_t *u_dom0_op)
{
long ret = 0;
-
- if ( !IS_PRIV(current->domain) )
- return -EPERM;
switch ( op->cmd )
{
@@ -409,6 +406,35 @@
}
break;
+ case DOM0_HYPERCALL_INIT:
+ {
+ struct domain *d;
+ unsigned long mfn = op->u.hypercall_init.mfn;
+ void *hypercall_page;
+
+ ret = -ESRCH;
+ if ( unlikely((d = find_domain_by_id(
+ op->u.hypercall_init.domain)) == NULL) )
+ break;
+
+ ret = -EACCES;
+ if ( !pfn_valid(mfn) ||
+ !get_page_and_type(pfn_to_page(mfn), d, PGT_writable_page) )
+ {
+ put_domain(d);
+ break;
+ }
+
+ ret = 0;
+
+ hypercall_page = map_domain_page(mfn);
+ hypercall_page_initialise(hypercall_page);
+ unmap_domain_page(hypercall_page);
+
+ put_domain(d);
+ }
+ break;
+
default:
ret = -ENOSYS;
break;
diff -r 246b6444c643 -r 71914b64b577 xen/arch/x86/domain_build.c
--- a/xen/arch/x86/domain_build.c Tue Jan 24 16:59:54 2006
+++ b/xen/arch/x86/domain_build.c Tue Jan 24 17:05:45 2006
@@ -146,6 +146,8 @@
struct pfn_info *page = NULL;
start_info_t *si;
struct vcpu *v = d->vcpu[0];
+ char *p;
+ unsigned long hypercall_page;
#if defined(__i386__)
char *image_start = (char *)_image_start; /* use lowmem mappings */
char *initrd_start = (char *)_initrd_start; /* use lowmem mappings */
@@ -239,7 +241,8 @@
xen_pae ? "yes" : "no", dom0_pae ? "yes" : "no");
return -EINVAL;
}
- if (strstr(dsi.xen_section_string, "SHADOW=translate"))
+
+ if ( strstr(dsi.xen_section_string, "SHADOW=translate") )
opt_dom0_translate = 1;
/* Align load address to 4MB boundary. */
@@ -604,6 +607,23 @@
/* Copy the OS image and free temporary buffer. */
(void)loadelfimage(&dsi);
+ p = strstr(dsi.xen_section_string, "HYPERCALL_PAGE=");
+ if ( p != NULL )
+ {
+ p += strlen("HYPERCALL_PAGE=");
+ hypercall_page = simple_strtoul(p, NULL, 16);
+ hypercall_page = dsi.v_start + (hypercall_page << PAGE_SHIFT);
+ if ( (hypercall_page < dsi.v_start) || (hypercall_page >= v_end) )
+ {
+ write_ptbase(current);
+ local_irq_enable();
+ printk("Invalid HYPERCALL_PAGE field in guest header.\n");
+ return -1;
+ }
+
+ hypercall_page_initialise((void *)hypercall_page);
+ }
+
init_domheap_pages(
_image_start, (_image_start+image_len+PAGE_SIZE-1) & PAGE_MASK);
diff -r 246b6444c643 -r 71914b64b577 xen/arch/x86/x86_32/traps.c
--- a/xen/arch/x86/x86_32/traps.c Tue Jan 24 16:59:54 2006
+++ b/xen/arch/x86/x86_32/traps.c Tue Jan 24 17:05:45 2006
@@ -298,6 +298,33 @@
return 0;
}
+void hypercall_page_initialise(void *hypercall_page)
+{
+ char *p;
+ int i;
+
+ /* Fill in all the transfer points with template machine code. */
+ for ( i = 0; i < (PAGE_SIZE / 32); i++ )
+ {
+ p = (char *)(hypercall_page + (i * 32));
+ *(u8 *)(p+ 0) = 0xb8; /* mov $<i>,%eax */
+ *(u32 *)(p+ 1) = i;
+ *(u16 *)(p+ 5) = 0x82cd; /* int $0x82 */
+ *(u8 *)(p+ 7) = 0xc3; /* ret */
+ }
+
+ /*
+ * HYPERVISOR_iret is special because it doesn't return and expects a
+ * special stack frame. Guests jump at this transfer point instead of
+ * calling it.
+ */
+ p = (char *)(hypercall_page + (__HYPERVISOR_iret * 32));
+ *(u8 *)(p+ 0) = 0x50; /* push %eax */
+ *(u8 *)(p+ 1) = 0xb8; /* mov $__HYPERVISOR_iret,%eax */
+ *(u32 *)(p+ 2) = __HYPERVISOR_iret;
+ *(u16 *)(p+ 6) = 0x82cd; /* int $0x82 */
+}
+
/*
* Local variables:
* mode: C
diff -r 246b6444c643 -r 71914b64b577 xen/arch/x86/x86_64/traps.c
--- a/xen/arch/x86/x86_64/traps.c Tue Jan 24 16:59:54 2006
+++ b/xen/arch/x86/x86_64/traps.c Tue Jan 24 17:05:45 2006
@@ -268,6 +268,39 @@
return 0;
}
+void hypercall_page_initialise(void *hypercall_page)
+{
+ char *p;
+ int i;
+
+ /* Fill in all the transfer points with template machine code. */
+ for ( i = 0; i < (PAGE_SIZE / 32); i++ )
+ {
+ p = (char *)(hypercall_page + (i * 32));
+ *(u8 *)(p+ 0) = 0x51; /* push %rcx */
+ *(u16 *)(p+ 1) = 0x5341; /* push %r11 */
+ *(u8 *)(p+ 3) = 0xb8; /* mov $<i>,%eax */
+ *(u32 *)(p+ 4) = i;
+ *(u16 *)(p+ 8) = 0x050f; /* syscall */
+ *(u16 *)(p+10) = 0x5b41; /* pop %r11 */
+ *(u8 *)(p+12) = 0x59; /* pop %rcx */
+ *(u8 *)(p+13) = 0xc3; /* ret */
+ }
+
+ /*
+ * HYPERVISOR_iret is special because it doesn't return and expects a
+ * special stack frame. Guests jump at this transfer point instead of
+ * calling it.
+ */
+ p = (char *)(hypercall_page + (__HYPERVISOR_iret * 32));
+ *(u8 *)(p+ 0) = 0x50; /* push %rax */
+ *(u8 *)(p+ 1) = 0x51; /* push %rcx */
+ *(u16 *)(p+ 2) = 0x5341; /* push %r11 */
+ *(u8 *)(p+ 4) = 0xb8; /* mov $__HYPERVISOR_iret,%eax */
+ *(u32 *)(p+ 5) = __HYPERVISOR_iret;
+ *(u16 *)(p+ 9) = 0x050f; /* syscall */
+}
+
/*
* Local variables:
* mode: C
diff -r 246b6444c643 -r 71914b64b577 xen/include/asm-x86/domain.h
--- a/xen/include/asm-x86/domain.h Tue Jan 24 16:59:54 2006
+++ b/xen/include/asm-x86/domain.h Tue Jan 24 17:05:45 2006
@@ -50,6 +50,12 @@
/* x86/64: toggle guest between kernel and user modes. */
extern void toggle_guest_mode(struct vcpu *);
+
+/*
+ * Initialise a hypercall-transfer page. The given pointer must be mapped
+ * in Xen virtual address space (accesses are not validated or checked).
+ */
+extern void hypercall_page_initialise(void *);
struct arch_domain
{
diff -r 246b6444c643 -r 71914b64b577 xen/include/public/dom0_ops.h
--- a/xen/include/public/dom0_ops.h Tue Jan 24 16:59:54 2006
+++ b/xen/include/public/dom0_ops.h Tue Jan 24 17:05:45 2006
@@ -424,6 +424,12 @@
unsigned long nr_pfns; /* number of pages in range (>0) */
uint8_t allow_access; /* allow (!0) or deny (0) access to range? */
} dom0_iomem_permission_t;
+
+#define DOM0_HYPERCALL_INIT 48
+typedef struct {
+ domid_t domain; /* domain to be affected */
+ unsigned long mfn; /* machine frame to be initialised */
+} dom0_hypercall_init_t;
typedef struct {
uint32_t cmd;
@@ -465,6 +471,7 @@
dom0_setdebugging_t setdebugging;
dom0_irq_permission_t irq_permission;
dom0_iomem_permission_t iomem_permission;
+ dom0_hypercall_init_t hypercall_init;
uint8_t pad[128];
} u;
} dom0_op_t;
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