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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] Adjust emulation code to deal with compatibility mode guests. This
# HG changeset patch
# User Emmanuel Ackaouy <ack@xxxxxxxxxxxxx>
# Date 1168018470 0
# Node ID 3870aff51ae384163b9ba20db1b5266d89565382
# Parent f632c0c3697657c0df031820dafeb74bf0b0f5bb
Adjust emulation code to deal with compatibility mode guests. This
includes enhancements to emulate_privileged_op() that aren't directly
related to such guests.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
xen/arch/x86/domain.c | 14 +
xen/arch/x86/mm.c | 31 +++
xen/arch/x86/traps.c | 296 ++++++++++++++++++++++++++++-------
xen/arch/x86/x86_64/mm.c | 6
xen/include/asm-x86/desc.h | 7
xen/include/asm-x86/mm.h | 5
xen/include/asm-x86/x86_32/uaccess.h | 2
xen/include/asm-x86/x86_64/uaccess.h | 2
8 files changed, 303 insertions(+), 60 deletions(-)
diff -r f632c0c36976 -r 3870aff51ae3 xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Fri Jan 05 17:34:30 2007 +0000
+++ b/xen/arch/x86/domain.c Fri Jan 05 17:34:30 2007 +0000
@@ -1055,6 +1055,20 @@ void domain_relinquish_resources(struct
{
/* Drop ref to guest_table (from new_guest_cr3(), svm/vmx cr3 handling,
* or sh_update_paging_modes()) */
+#ifdef CONFIG_COMPAT
+ if ( IS_COMPAT(d) )
+ {
+ pfn = l4e_get_pfn(*(l4_pgentry_t
*)__va(pagetable_get_paddr(v->arch.guest_table)));
+ if ( pfn != 0 )
+ {
+ if ( shadow_mode_refcounts(d) )
+ put_page(mfn_to_page(pfn));
+ else
+ put_page_and_type(mfn_to_page(pfn));
+ }
+ continue;
+ }
+#endif
pfn = pagetable_get_pfn(v->arch.guest_table);
if ( pfn != 0 )
{
diff -r f632c0c36976 -r 3870aff51ae3 xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Fri Jan 05 17:34:30 2007 +0000
+++ b/xen/arch/x86/mm.c Fri Jan 05 17:34:30 2007 +0000
@@ -1765,6 +1765,33 @@ int new_guest_cr3(unsigned long mfn)
if ( is_hvm_domain(d) && !hvm_paging_enabled(v) )
return 0;
+#ifdef CONFIG_COMPAT
+ if ( IS_COMPAT(d) )
+ {
+ l4_pgentry_t l4e = l4e_from_pfn(mfn,
_PAGE_PRESENT|_PAGE_RW|_PAGE_USER|_PAGE_ACCESSED);
+
+ if ( shadow_mode_refcounts(d) )
+ {
+ okay = get_page_from_pagenr(mfn, d);
+ old_base_mfn = l4e_get_pfn(l4e);
+ if ( okay && old_base_mfn )
+ put_page(mfn_to_page(old_base_mfn));
+ }
+ else
+ okay = mod_l4_entry(__va(pagetable_get_paddr(v->arch.guest_table)),
+ l4e, 0);
+ if ( unlikely(!okay) )
+ {
+ MEM_LOG("Error while installing new compat baseptr %lx", mfn);
+ return 0;
+ }
+
+ invalidate_shadow_ldt(v);
+ write_ptbase(v);
+
+ return 1;
+ }
+#endif
if ( shadow_mode_refcounts(d) )
{
okay = get_page_from_pagenr(mfn, d);
@@ -3204,7 +3231,7 @@ static int ptwr_emulated_update(
nl1e = l1e_from_intpte(val);
if ( unlikely(!get_page_from_l1e(gl1e_to_ml1e(d, nl1e), d)) )
{
- if ( (CONFIG_PAGING_LEVELS == 3) &&
+ if ( (CONFIG_PAGING_LEVELS == 3 || IS_COMPAT(d)) &&
(bytes == 4) &&
!do_cmpxchg &&
(l1e_get_flags(nl1e) & _PAGE_PRESENT) )
@@ -3347,7 +3374,7 @@ int ptwr_do_page_fault(struct vcpu *v, u
goto bail;
ptwr_ctxt.ctxt.regs = guest_cpu_user_regs();
- ptwr_ctxt.ctxt.mode = X86EMUL_MODE_HOST;
+ ptwr_ctxt.ctxt.mode = !IS_COMPAT(d) ? X86EMUL_MODE_HOST :
X86EMUL_MODE_PROT32;
ptwr_ctxt.cr2 = addr;
ptwr_ctxt.pte = pte;
if ( x86_emulate(&ptwr_ctxt.ctxt, &ptwr_emulate_ops) )
diff -r f632c0c36976 -r 3870aff51ae3 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c Fri Jan 05 17:34:30 2007 +0000
+++ b/xen/arch/x86/traps.c Fri Jan 05 17:34:30 2007 +0000
@@ -977,6 +977,64 @@ long do_fpu_taskswitch(int set)
return 0;
}
+static int read_descriptor(unsigned int sel,
+ const struct vcpu *v,
+ const struct cpu_user_regs * regs,
+ unsigned long *base,
+ unsigned long *limit,
+ unsigned int *ar,
+ unsigned int vm86attr)
+{
+ struct desc_struct desc;
+
+ if ( !vm86_mode(regs) )
+ {
+ if ( sel < 4)
+ desc.b = desc.a = 0;
+ else if ( __get_user(desc,
+ (const struct desc_struct *)(!(sel & 4)
+ ? GDT_VIRT_START(v)
+ : LDT_VIRT_START(v))
+ + (sel >> 3)) )
+ return 0;
+ if ( !(vm86attr & _SEGMENT_CODE) )
+ desc.b &= ~_SEGMENT_L;
+ }
+ else
+ {
+ desc.a = (sel << 20) | 0xffff;
+ desc.b = vm86attr | (sel >> 12);
+ }
+
+ *ar = desc.b & 0x00f0ff00;
+ if ( !(desc.b & _SEGMENT_L) )
+ {
+ *base = (desc.a >> 16) + ((desc.b & 0xff) << 16) + (desc.b &
0xff000000);
+ *limit = (desc.a & 0xffff) | (desc.b & 0x000f0000);
+ if ( desc.b & _SEGMENT_G )
+ *limit = ((*limit + 1) << 12) - 1;
+#ifndef NDEBUG
+ if ( !vm86_mode(regs) && sel > 3 )
+ {
+ unsigned int a, l;
+ unsigned char valid;
+
+ __asm__("larl %2, %0\n\tsetz %1" : "=r" (a), "=rm" (valid) : "rm"
(sel));
+ BUG_ON(valid && (a & 0x00f0ff00) != *ar);
+ __asm__("lsll %2, %0\n\tsetz %1" : "=r" (l), "=rm" (valid) : "rm"
(sel));
+ BUG_ON(valid && l != *limit);
+ }
+#endif
+ }
+ else
+ {
+ *base = 0UL;
+ *limit = ~0UL;
+ }
+
+ return 1;
+}
+
/* Has the guest requested sufficient permission for this I/O access? */
static inline int guest_io_okay(
unsigned int port, unsigned int bytes,
@@ -1041,65 +1099,113 @@ unsigned long guest_to_host_gpr_switch(u
__attribute__((__regparm__(1)));
/* Instruction fetch with error handling. */
-#define insn_fetch(_type, _size, cs, eip) \
-({ unsigned long _rc, _x, _ptr = eip; \
- if ( vm86_mode(regs) ) \
- _ptr += cs << 4; \
- if ( (_rc = copy_from_user(&_x, (_type *)_ptr, sizeof(_type))) != 0 ) \
+#define insn_fetch(type, base, eip, limit) \
+({ unsigned long _rc, _ptr = (base) + (eip); \
+ type _x; \
+ if ( (limit) < sizeof(_x) - 1 || (eip) > (limit) - (sizeof(_x) - 1) ) \
+ goto fail; \
+ if ( (_rc = copy_from_user(&_x, (type *)_ptr, sizeof(_x))) != 0 ) \
{ \
- propagate_page_fault(eip + sizeof(_type) - _rc, 0); \
+ propagate_page_fault(_ptr + sizeof(_x) - _rc, 0); \
return EXCRET_fault_fixed; \
} \
- eip += _size; (_type)_x; })
+ (eip) += sizeof(_x); _x; })
+
+#if defined(CONFIG_X86_32)
+# define read_sreg(regs, sr) ((regs)->sr)
+#elif defined(CONFIG_X86_64)
+# define read_sreg(regs, sr) read_segment_register(sr)
+#endif
static int emulate_privileged_op(struct cpu_user_regs *regs)
{
struct vcpu *v = current;
- unsigned long *reg, eip = regs->eip, cs = regs->cs, res;
- u8 opcode, modrm_reg = 0, modrm_rm = 0, rep_prefix = 0;
- unsigned int port, i, op_bytes = 4, data, rc;
+ unsigned long *reg, eip = regs->eip, res;
+ u8 opcode, modrm_reg = 0, modrm_rm = 0, rep_prefix = 0, rex = 0;
+ enum { lm_seg_none, lm_seg_fs, lm_seg_gs } lm_ovr = lm_seg_none;
+ unsigned int port, i, data_sel, ar, data, rc;
+ unsigned int op_bytes, op_default, ad_bytes, ad_default;
+#define rd_ad(reg) (ad_bytes >= sizeof(regs->reg) \
+ ? regs->reg \
+ : ad_bytes == 4 \
+ ? (u32)regs->reg \
+ : (u16)regs->reg)
+#define wr_ad(reg, val) (ad_bytes >= sizeof(regs->reg) \
+ ? regs->reg = (val) \
+ : ad_bytes == 4 \
+ ? (*(u32 *)®s->reg = (val)) \
+ : (*(u16 *)®s->reg = (val)))
+ unsigned long code_base, code_limit;
char io_emul_stub[16];
void (*io_emul)(struct cpu_user_regs *) __attribute__((__regparm__(1)));
u32 l, h;
+ if ( !read_descriptor(regs->cs, v, regs,
+ &code_base, &code_limit, &ar,
+ _SEGMENT_CODE|_SEGMENT_S|_SEGMENT_DPL|_SEGMENT_P) )
+ goto fail;
+ op_default = op_bytes = (ar & (_SEGMENT_L|_SEGMENT_DB)) ? 4 : 2;
+ ad_default = ad_bytes = (ar & _SEGMENT_L) ? 8 : op_default;
+ if ( !(ar & (_SEGMENT_CODE|_SEGMENT_S|_SEGMENT_P)) )
+ goto fail;
+
+ /* emulating only opcodes not allowing SS to be default */
+ data_sel = read_sreg(regs, ds);
+
/* Legacy prefixes. */
- for ( i = 0; i < 8; i++ )
- {
- switch ( opcode = insn_fetch(u8, 1, cs, eip) )
+ for ( i = 0; i < 8; i++, rex == opcode || (rex = 0) )
+ {
+ switch ( opcode = insn_fetch(u8, code_base, eip, code_limit) )
{
case 0x66: /* operand-size override */
- op_bytes ^= 6; /* switch between 2/4 bytes */
- break;
+ op_bytes = op_default ^ 6; /* switch between 2/4 bytes */
+ continue;
case 0x67: /* address-size override */
+ ad_bytes = ad_default != 4 ? 4 : 2; /* switch to 2/4 bytes */
+ continue;
case 0x2e: /* CS override */
+ data_sel = regs->cs;
+ continue;
case 0x3e: /* DS override */
+ data_sel = read_sreg(regs, ds);
+ continue;
case 0x26: /* ES override */
+ data_sel = read_sreg(regs, es);
+ continue;
case 0x64: /* FS override */
+ data_sel = read_sreg(regs, fs);
+ lm_ovr = lm_seg_fs;
+ continue;
case 0x65: /* GS override */
+ data_sel = read_sreg(regs, gs);
+ lm_ovr = lm_seg_gs;
+ continue;
case 0x36: /* SS override */
+ data_sel = regs->ss;
+ continue;
case 0xf0: /* LOCK */
+ continue;
case 0xf2: /* REPNE/REPNZ */
- break;
case 0xf3: /* REP/REPE/REPZ */
rep_prefix = 1;
- break;
+ continue;
default:
- goto done_prefixes;
- }
- }
- done_prefixes:
-
-#ifdef __x86_64__
+ if ( (ar & _SEGMENT_L) && (opcode & 0xf0) == 0x40 )
+ {
+ rex = opcode;
+ continue;
+ }
+ break;
+ }
+ break;
+ }
+
/* REX prefix. */
- if ( (opcode & 0xf0) == 0x40 )
- {
- modrm_reg = (opcode & 4) << 1; /* REX.R */
- modrm_rm = (opcode & 1) << 3; /* REX.B */
-
- /* REX.W and REX.X do not need to be decoded. */
- opcode = insn_fetch(u8, 1, cs, eip);
- }
-#endif
+ if ( rex & 8 ) /* REX.W */
+ op_bytes = 4; /* emulating only opcodes not supporting 64-bit operands
*/
+ modrm_reg = (rex & 4) << 1; /* REX.R */
+ /* REX.X does not need to be decoded. */
+ modrm_rm = (rex & 1) << 3; /* REX.B */
if ( opcode == 0x0f )
goto twobyte_opcode;
@@ -1107,8 +1213,58 @@ static int emulate_privileged_op(struct
/* Input/Output String instructions. */
if ( (opcode >= 0x6c) && (opcode <= 0x6f) )
{
- if ( rep_prefix && (regs->ecx == 0) )
+ unsigned long data_base, data_limit;
+
+ if ( rep_prefix && (rd_ad(ecx) == 0) )
goto done;
+
+ if ( !(opcode & 2) )
+ {
+ data_sel = read_sreg(regs, es);
+ lm_ovr = lm_seg_none;
+ }
+
+ if ( !(ar & _SEGMENT_L) )
+ {
+ if ( !read_descriptor(data_sel, v, regs,
+ &data_base, &data_limit, &ar,
+
_SEGMENT_WR|_SEGMENT_S|_SEGMENT_DPL|_SEGMENT_P) )
+ goto fail;
+ if ( !(ar & (_SEGMENT_S|_SEGMENT_P)) ||
+ (opcode & 2 ?
+ (ar & _SEGMENT_CODE) && !(ar & _SEGMENT_WR) :
+ (ar & _SEGMENT_CODE) || !(ar & _SEGMENT_WR)) )
+ goto fail;
+ }
+#ifdef CONFIG_X86_64
+ else
+ {
+ if ( lm_ovr == lm_seg_none || data_sel < 4 )
+ {
+ switch ( lm_ovr )
+ {
+ case lm_seg_none:
+ data_base = 0UL;
+ break;
+ case lm_seg_fs:
+ data_base = v->arch.guest_context.fs_base;
+ break;
+ case lm_seg_gs:
+ if ( guest_kernel_mode(v, regs) )
+ data_base = v->arch.guest_context.gs_base_kernel;
+ else
+ data_base = v->arch.guest_context.gs_base_user;
+ break;
+ }
+ }
+ else
+ read_descriptor(data_sel, v, regs,
+ &data_base, &data_limit, &ar,
+ 0);
+ data_limit = ~0UL;
+ ar = _SEGMENT_WR|_SEGMENT_S|_SEGMENT_DPL|_SEGMENT_P;
+ }
+#endif
continue_io_string:
switch ( opcode )
@@ -1116,7 +1272,9 @@ static int emulate_privileged_op(struct
case 0x6c: /* INSB */
op_bytes = 1;
case 0x6d: /* INSW/INSL */
- if ( !guest_io_okay((u16)regs->edx, op_bytes, v, regs) )
+ if ( data_limit < op_bytes - 1 ||
+ rd_ad(edi) > data_limit - (op_bytes - 1) ||
+ !guest_io_okay((u16)regs->edx, op_bytes, v, regs) )
goto fail;
port = (u16)regs->edx;
switch ( op_bytes )
@@ -1134,24 +1292,26 @@ static int emulate_privileged_op(struct
data = (u32)(guest_inl_okay(port, v, regs) ? inl(port) : ~0);
break;
}
- if ( (rc = copy_to_user((void *)regs->edi, &data, op_bytes)) != 0 )
+ if ( (rc = copy_to_user((void *)data_base + rd_ad(edi), &data,
op_bytes)) != 0 )
{
- propagate_page_fault(regs->edi + op_bytes - rc,
+ propagate_page_fault(data_base + rd_ad(edi) + op_bytes - rc,
PFEC_write_access);
return EXCRET_fault_fixed;
}
- regs->edi += (int)((regs->eflags & EF_DF) ? -op_bytes : op_bytes);
+ wr_ad(edi, regs->edi + (int)((regs->eflags & EF_DF) ? -op_bytes :
op_bytes));
break;
case 0x6e: /* OUTSB */
op_bytes = 1;
case 0x6f: /* OUTSW/OUTSL */
- if ( !guest_io_okay((u16)regs->edx, op_bytes, v, regs) )
+ if ( data_limit < op_bytes - 1 ||
+ rd_ad(esi) > data_limit - (op_bytes - 1) ||
+ !guest_io_okay((u16)regs->edx, op_bytes, v, regs) )
goto fail;
- rc = copy_from_user(&data, (void *)regs->esi, op_bytes);
+ rc = copy_from_user(&data, (void *)data_base + rd_ad(esi),
op_bytes);
if ( rc != 0 )
{
- propagate_page_fault(regs->esi + op_bytes - rc, 0);
+ propagate_page_fault(data_base + rd_ad(esi) + op_bytes - rc,
0);
return EXCRET_fault_fixed;
}
port = (u16)regs->edx;
@@ -1172,11 +1332,11 @@ static int emulate_privileged_op(struct
outl((u32)data, port);
break;
}
- regs->esi += (int)((regs->eflags & EF_DF) ? -op_bytes : op_bytes);
- break;
- }
-
- if ( rep_prefix && (--regs->ecx != 0) )
+ wr_ad(esi, regs->esi + (int)((regs->eflags & EF_DF) ? -op_bytes :
op_bytes));
+ break;
+ }
+
+ if ( rep_prefix && (wr_ad(ecx, regs->ecx - 1) != 0) )
{
if ( !hypercall_preempt_check() )
goto continue_io_string;
@@ -1216,7 +1376,7 @@ static int emulate_privileged_op(struct
case 0xe4: /* IN imm8,%al */
op_bytes = 1;
case 0xe5: /* IN imm8,%eax */
- port = insn_fetch(u8, 1, cs, eip);
+ port = insn_fetch(u8, code_base, eip, code_limit);
io_emul_stub[7] = port; /* imm8 */
exec_in:
if ( !guest_io_okay(port, op_bytes, v, regs) )
@@ -1258,7 +1418,7 @@ static int emulate_privileged_op(struct
case 0xe6: /* OUT %al,imm8 */
op_bytes = 1;
case 0xe7: /* OUT %eax,imm8 */
- port = insn_fetch(u8, 1, cs, eip);
+ port = insn_fetch(u8, code_base, eip, code_limit);
io_emul_stub[7] = port; /* imm8 */
exec_out:
if ( !guest_io_okay(port, op_bytes, v, regs) )
@@ -1311,7 +1471,7 @@ static int emulate_privileged_op(struct
goto fail;
/* Privileged (ring 0) instructions. */
- opcode = insn_fetch(u8, 1, cs, eip);
+ opcode = insn_fetch(u8, code_base, eip, code_limit);
switch ( opcode )
{
case 0x06: /* CLTS */
@@ -1329,7 +1489,7 @@ static int emulate_privileged_op(struct
break;
case 0x20: /* MOV CR?,<reg> */
- opcode = insn_fetch(u8, 1, cs, eip);
+ opcode = insn_fetch(u8, code_base, eip, code_limit);
modrm_reg |= (opcode >> 3) & 7;
modrm_rm |= (opcode >> 0) & 7;
reg = decode_register(modrm_rm, regs, 0);
@@ -1345,8 +1505,14 @@ static int emulate_privileged_op(struct
break;
case 3: /* Read CR3 */
- *reg = xen_pfn_to_cr3(mfn_to_gmfn(
- v->domain, pagetable_get_pfn(v->arch.guest_table)));
+ if ( !IS_COMPAT(v->domain) )
+ *reg = xen_pfn_to_cr3(mfn_to_gmfn(
+ v->domain, pagetable_get_pfn(v->arch.guest_table)));
+#ifdef CONFIG_COMPAT
+ else
+ *reg = compat_pfn_to_cr3(mfn_to_gmfn(
+ v->domain, l4e_get_pfn(*(l4_pgentry_t
*)__va(pagetable_get_paddr(v->arch.guest_table)))));
+#endif
break;
case 4: /* Read CR4 */
@@ -1363,7 +1529,7 @@ static int emulate_privileged_op(struct
break;
case 0x21: /* MOV DR?,<reg> */
- opcode = insn_fetch(u8, 1, cs, eip);
+ opcode = insn_fetch(u8, code_base, eip, code_limit);
modrm_reg |= (opcode >> 3) & 7;
modrm_rm |= (opcode >> 0) & 7;
reg = decode_register(modrm_rm, regs, 0);
@@ -1373,7 +1539,7 @@ static int emulate_privileged_op(struct
break;
case 0x22: /* MOV <reg>,CR? */
- opcode = insn_fetch(u8, 1, cs, eip);
+ opcode = insn_fetch(u8, code_base, eip, code_limit);
modrm_reg |= (opcode >> 3) & 7;
modrm_rm |= (opcode >> 0) & 7;
reg = decode_register(modrm_rm, regs, 0);
@@ -1396,7 +1562,12 @@ static int emulate_privileged_op(struct
case 3: /* Write CR3 */
LOCK_BIGLOCK(v->domain);
- rc = new_guest_cr3(gmfn_to_mfn(v->domain, xen_cr3_to_pfn(*reg)));
+ if ( !IS_COMPAT(v->domain) )
+ rc = new_guest_cr3(gmfn_to_mfn(v->domain,
xen_cr3_to_pfn(*reg)));
+#ifdef CONFIG_COMPAT
+ else
+ rc = new_guest_cr3(gmfn_to_mfn(v->domain,
compat_cr3_to_pfn(*reg)));
+#endif
UNLOCK_BIGLOCK(v->domain);
if ( rc == 0 ) /* not okay */
goto fail;
@@ -1416,7 +1587,7 @@ static int emulate_privileged_op(struct
break;
case 0x23: /* MOV <reg>,DR? */
- opcode = insn_fetch(u8, 1, cs, eip);
+ opcode = insn_fetch(u8, code_base, eip, code_limit);
modrm_reg |= (opcode >> 3) & 7;
modrm_rm |= (opcode >> 0) & 7;
reg = decode_register(modrm_rm, regs, 0);
@@ -1429,18 +1600,24 @@ static int emulate_privileged_op(struct
{
#ifdef CONFIG_X86_64
case MSR_FS_BASE:
+ if ( IS_COMPAT(v->domain) )
+ goto fail;
if ( wrmsr_safe(MSR_FS_BASE, regs->eax, regs->edx) )
goto fail;
v->arch.guest_context.fs_base =
((u64)regs->edx << 32) | regs->eax;
break;
case MSR_GS_BASE:
+ if ( IS_COMPAT(v->domain) )
+ goto fail;
if ( wrmsr_safe(MSR_GS_BASE, regs->eax, regs->edx) )
goto fail;
v->arch.guest_context.gs_base_kernel =
((u64)regs->edx << 32) | regs->eax;
break;
case MSR_SHADOW_GS_BASE:
+ if ( IS_COMPAT(v->domain) )
+ goto fail;
if ( wrmsr_safe(MSR_SHADOW_GS_BASE, regs->eax, regs->edx) )
goto fail;
v->arch.guest_context.gs_base_user =
@@ -1465,14 +1642,20 @@ static int emulate_privileged_op(struct
{
#ifdef CONFIG_X86_64
case MSR_FS_BASE:
+ if ( IS_COMPAT(v->domain) )
+ goto fail;
regs->eax = v->arch.guest_context.fs_base & 0xFFFFFFFFUL;
regs->edx = v->arch.guest_context.fs_base >> 32;
break;
case MSR_GS_BASE:
+ if ( IS_COMPAT(v->domain) )
+ goto fail;
regs->eax = v->arch.guest_context.gs_base_kernel & 0xFFFFFFFFUL;
regs->edx = v->arch.guest_context.gs_base_kernel >> 32;
break;
case MSR_SHADOW_GS_BASE:
+ if ( IS_COMPAT(v->domain) )
+ goto fail;
regs->eax = v->arch.guest_context.gs_base_user & 0xFFFFFFFFUL;
regs->edx = v->arch.guest_context.gs_base_user >> 32;
break;
@@ -1500,6 +1683,9 @@ static int emulate_privileged_op(struct
default:
goto fail;
}
+
+#undef wr_ad
+#undef rd_ad
done:
regs->eip = eip;
diff -r f632c0c36976 -r 3870aff51ae3 xen/arch/x86/x86_64/mm.c
--- a/xen/arch/x86/x86_64/mm.c Fri Jan 05 17:34:30 2007 +0000
+++ b/xen/arch/x86/x86_64/mm.c Fri Jan 05 17:34:30 2007 +0000
@@ -376,7 +376,11 @@ int check_descriptor(const struct domain
/* All code and data segments are okay. No base/limit checking. */
if ( (b & _SEGMENT_S) )
- goto good;
+ {
+ if ( !IS_COMPAT(dom) || !(b & _SEGMENT_L) )
+ goto good;
+ goto bad;
+ }
/* Invalid type 0 is harmless. It is used for 2nd half of a call gate. */
if ( (b & _SEGMENT_TYPE) == 0x000 )
diff -r f632c0c36976 -r 3870aff51ae3 xen/include/asm-x86/desc.h
--- a/xen/include/asm-x86/desc.h Fri Jan 05 17:34:30 2007 +0000
+++ b/xen/include/asm-x86/desc.h Fri Jan 05 17:34:30 2007 +0000
@@ -113,12 +113,19 @@
/* These are bitmasks for the high 32 bits of a descriptor table entry. */
#define _SEGMENT_TYPE (15<< 8)
+#define _SEGMENT_WR ( 1<< 9) /* Writeable (data) or Readable (code)
+ segment */
#define _SEGMENT_EC ( 1<<10) /* Expand-down or Conforming segment */
#define _SEGMENT_CODE ( 1<<11) /* Code (vs data) segment for non-system
segments */
#define _SEGMENT_S ( 1<<12) /* System descriptor (yes iff S==0) */
#define _SEGMENT_DPL ( 3<<13) /* Descriptor Privilege Level */
#define _SEGMENT_P ( 1<<15) /* Segment Present */
+#ifdef __x86_64
+#define _SEGMENT_L ( 1<<21) /* 64-bit segment */
+#else
+#define _SEGMENT_L 0
+#endif
#define _SEGMENT_DB ( 1<<22) /* 16- or 32-bit segment */
#define _SEGMENT_G ( 1<<23) /* Granularity */
diff -r f632c0c36976 -r 3870aff51ae3 xen/include/asm-x86/mm.h
--- a/xen/include/asm-x86/mm.h Fri Jan 05 17:34:30 2007 +0000
+++ b/xen/include/asm-x86/mm.h Fri Jan 05 17:34:30 2007 +0000
@@ -279,6 +279,11 @@ int check_descriptor(const struct domain
#define INVALID_MFN (~0UL)
+#ifdef CONFIG_COMPAT
+#define compat_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >>
20))
+#define compat_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) <<
20))
+#endif
+
#ifdef MEMORY_GUARD
void memguard_init(void);
void memguard_guard_range(void *p, unsigned long l);
diff -r f632c0c36976 -r 3870aff51ae3 xen/include/asm-x86/x86_32/uaccess.h
--- a/xen/include/asm-x86/x86_32/uaccess.h Fri Jan 05 17:34:30 2007 +0000
+++ b/xen/include/asm-x86/x86_32/uaccess.h Fri Jan 05 17:34:30 2007 +0000
@@ -83,7 +83,7 @@ do {
\
case 2: __get_user_asm(x,ptr,retval,"w","w","=r",errret);break; \
case 4: __get_user_asm(x,ptr,retval,"l","","=r",errret);break; \
case 8: __get_user_u64(x,ptr,retval,errret);break; \
- default: (x) = __get_user_bad(); \
+ default: __get_user_bad(); \
} \
} while (0)
diff -r f632c0c36976 -r 3870aff51ae3 xen/include/asm-x86/x86_64/uaccess.h
--- a/xen/include/asm-x86/x86_64/uaccess.h Fri Jan 05 17:34:30 2007 +0000
+++ b/xen/include/asm-x86/x86_64/uaccess.h Fri Jan 05 17:34:30 2007 +0000
@@ -48,7 +48,7 @@ do {
\
case 2: __get_user_asm(x,ptr,retval,"w","w","=r",errret);break; \
case 4: __get_user_asm(x,ptr,retval,"l","k","=r",errret);break; \
case 8: __get_user_asm(x,ptr,retval,"q","","=r",errret); break; \
- default: (x) = __get_user_bad(); \
+ default: __get_user_bad(); \
} \
} while (0)
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