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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86_emulate: Check I/O port accesses.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1206638722 0
# Node ID e7abfeee280832606426baed80190a9e337ccf4e
# Parent 892a20f824a7aa5c5ed57ce80fc61f1dffd4b4d2
x86_emulate: Check I/O port accesses.
Implements both CPL/IOPL and TSS-bitmap checks.
Requires changes to read/write callback hooks to disable user-access
checks when walking pagetables on behalf of GDT/LDT/TSS accesses.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/arch/x86/hvm/emulate.c | 62 +++++++++++------
xen/arch/x86/hvm/hvm.c | 133 +++++++++++++++++---------------------
xen/arch/x86/hvm/svm/emulate.c | 4 -
xen/arch/x86/mm/shadow/common.c | 8 +-
xen/arch/x86/x86_emulate.c | 65 ++++++++++++++++--
xen/include/asm-x86/hvm/support.h | 18 +++--
6 files changed, 177 insertions(+), 113 deletions(-)
diff -r 892a20f824a7 -r e7abfeee2808 xen/arch/x86/hvm/emulate.c
--- a/xen/arch/x86/hvm/emulate.c Thu Mar 27 17:14:41 2008 +0000
+++ b/xen/arch/x86/hvm/emulate.c Thu Mar 27 17:25:22 2008 +0000
@@ -94,19 +94,18 @@ static int hvmemul_do_mmio(
* Convert addr from linear to physical form, valid over the range
* [addr, addr + *reps * bytes_per_rep]. *reps is adjusted according to
* the valid computed range. It is always >0 when X86EMUL_OKAY is returned.
+ * @pfec indicates the access checks to be performed during page-table walks.
*/
static int hvmemul_linear_to_phys(
unsigned long addr,
paddr_t *paddr,
unsigned int bytes_per_rep,
unsigned long *reps,
- enum hvm_access_type access_type,
+ uint32_t pfec,
struct hvm_emulate_ctxt *hvmemul_ctxt)
{
struct vcpu *curr = current;
unsigned long pfn, npfn, done, todo, i;
- struct segment_register *sreg;
- uint32_t pfec;
/* Clip repetitions to a sensible maximum. */
*reps = min_t(unsigned long, *reps, 4096);
@@ -119,14 +118,6 @@ static int hvmemul_linear_to_phys(
}
*paddr = addr & ~PAGE_MASK;
-
- /* Gather access-type information for the page walks. */
- sreg = hvmemul_get_seg_reg(x86_seg_ss, hvmemul_ctxt);
- pfec = PFEC_page_present;
- if ( sreg->attr.fields.dpl == 3 )
- pfec |= PFEC_user_mode;
- if ( access_type == hvm_access_write )
- pfec |= PFEC_write_access;
/* Get the first PFN in the range. */
if ( (pfn = paging_gva_to_gfn(curr, addr, &pfec)) == INVALID_GFN )
@@ -216,6 +207,7 @@ static int __hvmemul_read(
{
struct vcpu *curr = current;
unsigned long addr;
+ uint32_t pfec = PFEC_page_present;
paddr_t gpa;
int rc;
@@ -237,9 +229,13 @@ static int __hvmemul_read(
return hvmemul_do_mmio(gpa, 1, bytes, 0, IOREQ_READ, 0, 0, val);
}
+ if ( (seg != x86_seg_none) &&
+ (hvmemul_ctxt->seg_reg[x86_seg_ss].attr.fields.dpl == 3) )
+ pfec |= PFEC_user_mode;
+
rc = ((access_type == hvm_access_insn_fetch) ?
- hvm_fetch_from_guest_virt(val, addr, bytes) :
- hvm_copy_from_guest_virt(val, addr, bytes));
+ hvm_fetch_from_guest_virt(val, addr, bytes, pfec) :
+ hvm_copy_from_guest_virt(val, addr, bytes, pfec));
if ( rc == HVMCOPY_bad_gva_to_gfn )
return X86EMUL_EXCEPTION;
@@ -251,7 +247,7 @@ static int __hvmemul_read(
return X86EMUL_UNHANDLEABLE;
rc = hvmemul_linear_to_phys(
- addr, &gpa, bytes, &reps, access_type, hvmemul_ctxt);
+ addr, &gpa, bytes, &reps, pfec, hvmemul_ctxt);
if ( rc != X86EMUL_OKAY )
return rc;
@@ -307,6 +303,7 @@ static int hvmemul_write(
container_of(ctxt, struct hvm_emulate_ctxt, ctxt);
struct vcpu *curr = current;
unsigned long addr;
+ uint32_t pfec = PFEC_page_present | PFEC_write_access;
paddr_t gpa;
int rc;
@@ -325,7 +322,11 @@ static int hvmemul_write(
0, 0, NULL);
}
- rc = hvm_copy_to_guest_virt(addr, &val, bytes);
+ if ( (seg != x86_seg_none) &&
+ (hvmemul_ctxt->seg_reg[x86_seg_ss].attr.fields.dpl == 3) )
+ pfec |= PFEC_user_mode;
+
+ rc = hvm_copy_to_guest_virt(addr, &val, bytes, pfec);
if ( rc == HVMCOPY_bad_gva_to_gfn )
return X86EMUL_EXCEPTION;
@@ -334,7 +335,7 @@ static int hvmemul_write(
unsigned long reps = 1;
rc = hvmemul_linear_to_phys(
- addr, &gpa, bytes, &reps, hvm_access_write, hvmemul_ctxt);
+ addr, &gpa, bytes, &reps, pfec, hvmemul_ctxt);
if ( rc != X86EMUL_OKAY )
return rc;
@@ -367,6 +368,7 @@ static int hvmemul_rep_ins(
struct hvm_emulate_ctxt *hvmemul_ctxt =
container_of(ctxt, struct hvm_emulate_ctxt, ctxt);
unsigned long addr;
+ uint32_t pfec = PFEC_page_present | PFEC_write_access;
paddr_t gpa;
int rc;
@@ -376,8 +378,11 @@ static int hvmemul_rep_ins(
if ( rc != X86EMUL_OKAY )
return rc;
+ if ( hvmemul_ctxt->seg_reg[x86_seg_ss].attr.fields.dpl == 3 )
+ pfec |= PFEC_user_mode;
+
rc = hvmemul_linear_to_phys(
- addr, &gpa, bytes_per_rep, reps, hvm_access_write, hvmemul_ctxt);
+ addr, &gpa, bytes_per_rep, reps, pfec, hvmemul_ctxt);
if ( rc != X86EMUL_OKAY )
return rc;
@@ -396,6 +401,7 @@ static int hvmemul_rep_outs(
struct hvm_emulate_ctxt *hvmemul_ctxt =
container_of(ctxt, struct hvm_emulate_ctxt, ctxt);
unsigned long addr;
+ uint32_t pfec = PFEC_page_present;
paddr_t gpa;
int rc;
@@ -405,8 +411,11 @@ static int hvmemul_rep_outs(
if ( rc != X86EMUL_OKAY )
return rc;
+ if ( hvmemul_ctxt->seg_reg[x86_seg_ss].attr.fields.dpl == 3 )
+ pfec |= PFEC_user_mode;
+
rc = hvmemul_linear_to_phys(
- addr, &gpa, bytes_per_rep, reps, hvm_access_read, hvmemul_ctxt);
+ addr, &gpa, bytes_per_rep, reps, pfec, hvmemul_ctxt);
if ( rc != X86EMUL_OKAY )
return rc;
@@ -427,6 +436,7 @@ static int hvmemul_rep_movs(
container_of(ctxt, struct hvm_emulate_ctxt, ctxt);
unsigned long saddr, daddr;
paddr_t sgpa, dgpa;
+ uint32_t pfec = PFEC_page_present;
p2m_type_t p2mt;
int rc;
@@ -442,13 +452,17 @@ static int hvmemul_rep_movs(
if ( rc != X86EMUL_OKAY )
return rc;
+ if ( hvmemul_ctxt->seg_reg[x86_seg_ss].attr.fields.dpl == 3 )
+ pfec |= PFEC_user_mode;
+
rc = hvmemul_linear_to_phys(
- saddr, &sgpa, bytes_per_rep, reps, hvm_access_read, hvmemul_ctxt);
+ saddr, &sgpa, bytes_per_rep, reps, pfec, hvmemul_ctxt);
if ( rc != X86EMUL_OKAY )
return rc;
rc = hvmemul_linear_to_phys(
- daddr, &dgpa, bytes_per_rep, reps, hvm_access_write, hvmemul_ctxt);
+ daddr, &dgpa, bytes_per_rep, reps,
+ pfec | PFEC_write_access, hvmemul_ctxt);
if ( rc != X86EMUL_OKAY )
return rc;
@@ -696,7 +710,7 @@ int hvm_emulate_one(
{
struct cpu_user_regs *regs = hvmemul_ctxt->ctxt.regs;
struct vcpu *curr = current;
- uint32_t new_intr_shadow;
+ uint32_t new_intr_shadow, pfec = PFEC_page_present;
unsigned long addr;
int rc;
@@ -712,6 +726,9 @@ int hvm_emulate_one(
hvmemul_ctxt->ctxt.sp_size =
hvmemul_ctxt->seg_reg[x86_seg_ss].attr.fields.db ? 32 : 16;
}
+
+ if ( hvmemul_ctxt->seg_reg[x86_seg_ss].attr.fields.dpl == 3 )
+ pfec |= PFEC_user_mode;
hvmemul_ctxt->insn_buf_eip = regs->eip;
hvmemul_ctxt->insn_buf_bytes =
@@ -720,7 +737,8 @@ int hvm_emulate_one(
regs->eip, sizeof(hvmemul_ctxt->insn_buf),
hvm_access_insn_fetch, hvmemul_ctxt->ctxt.addr_size, &addr) &&
!hvm_fetch_from_guest_virt_nofault(
- hvmemul_ctxt->insn_buf, addr, sizeof(hvmemul_ctxt->insn_buf)))
+ hvmemul_ctxt->insn_buf, addr,
+ sizeof(hvmemul_ctxt->insn_buf), pfec))
? sizeof(hvmemul_ctxt->insn_buf) : 0;
hvmemul_ctxt->exn_pending = 0;
diff -r 892a20f824a7 -r e7abfeee2808 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c Thu Mar 27 17:14:41 2008 +0000
+++ b/xen/arch/x86/hvm/hvm.c Thu Mar 27 17:25:22 2008 +0000
@@ -1302,7 +1302,7 @@ void hvm_task_switch(
goto out;
}
- if ( !tr.attr.fields.g && (tr.limit < (sizeof(tss)-1)) )
+ if ( tr.limit < (sizeof(tss)-1) )
{
hvm_inject_exception(TRAP_invalid_tss, tss_sel & 0xfff8, 0);
goto out;
@@ -1410,7 +1410,7 @@ void hvm_task_switch(
if ( hvm_virtual_to_linear_addr(x86_seg_ss, ®, regs->esp,
4, hvm_access_write, 32,
&linear_addr) )
- hvm_copy_to_guest_virt_nofault(linear_addr, &errcode, 4);
+ hvm_copy_to_guest_virt_nofault(linear_addr, &errcode, 4, 0);
}
out:
@@ -1418,60 +1418,31 @@ void hvm_task_switch(
hvm_unmap(nptss_desc);
}
-/*
- * __hvm_copy():
- * @buf = hypervisor buffer
- * @addr = guest address to copy to/from
- * @size = number of bytes to copy
- * @dir = copy *to* guest (TRUE) or *from* guest (FALSE)?
- * @virt = addr is *virtual* (TRUE) or *guest physical* (FALSE)?
- * @fetch = copy is an instruction fetch?
- * Returns number of bytes failed to copy (0 == complete success).
- */
+#define HVMCOPY_from_guest (0u<<0)
+#define HVMCOPY_to_guest (1u<<0)
+#define HVMCOPY_no_fault (0u<<1)
+#define HVMCOPY_fault (1u<<1)
+#define HVMCOPY_phys (0u<<2)
+#define HVMCOPY_virt (1u<<2)
static enum hvm_copy_result __hvm_copy(
- void *buf, paddr_t addr, int size, int dir, int virt, int fetch)
+ void *buf, paddr_t addr, int size, unsigned int flags, uint32_t pfec)
{
struct vcpu *curr = current;
unsigned long gfn, mfn;
p2m_type_t p2mt;
char *p;
- int count, todo;
- uint32_t pfec = PFEC_page_present;
-
- /*
- * We cannot use hvm_get_segment_register() while executing in
- * vmx_realmode() as segment register state is cached. Furthermore,
- * VMREADs on every data access hurts emulation performance.
- * Hence we do not gather extra PFEC flags if CR0.PG == 0.
- */
- if ( !(curr->arch.hvm_vcpu.guest_cr[0] & X86_CR0_PG) )
- virt = 0;
-
- if ( virt )
- {
- struct segment_register sreg;
- hvm_get_segment_register(curr, x86_seg_ss, &sreg);
- if ( sreg.attr.fields.dpl == 3 )
- pfec |= PFEC_user_mode;
-
- if ( dir )
- pfec |= PFEC_write_access;
-
- if ( fetch )
- pfec |= PFEC_insn_fetch;
- }
-
- todo = size;
+ int count, todo = size;
+
while ( todo > 0 )
{
count = min_t(int, PAGE_SIZE - (addr & ~PAGE_MASK), todo);
- if ( virt )
+ if ( flags & HVMCOPY_virt )
{
gfn = paging_gva_to_gfn(curr, addr, &pfec);
if ( gfn == INVALID_GFN )
{
- if ( virt == 2 ) /* 2 means generate a fault */
+ if ( flags & HVMCOPY_fault )
hvm_inject_exception(TRAP_page_fault, pfec, addr);
return HVMCOPY_bad_gva_to_gfn;
}
@@ -1489,16 +1460,18 @@ static enum hvm_copy_result __hvm_copy(
p = (char *)map_domain_page(mfn) + (addr & ~PAGE_MASK);
- if ( dir )
+ if ( flags & HVMCOPY_to_guest )
{
- memcpy(p, buf, count); /* dir == TRUE: *to* guest */
+ memcpy(p, buf, count);
paging_mark_dirty(curr->domain, mfn);
}
else
- memcpy(buf, p, count); /* dir == FALSE: *from guest */
+ {
+ memcpy(buf, p, count);
+ }
unmap_domain_page(p);
-
+
addr += count;
buf += count;
todo -= count;
@@ -1510,56 +1483,73 @@ enum hvm_copy_result hvm_copy_to_guest_p
enum hvm_copy_result hvm_copy_to_guest_phys(
paddr_t paddr, void *buf, int size)
{
- return __hvm_copy(buf, paddr, size, 1, 0, 0);
+ return __hvm_copy(buf, paddr, size,
+ HVMCOPY_to_guest | HVMCOPY_fault | HVMCOPY_phys,
+ 0);
}
enum hvm_copy_result hvm_copy_from_guest_phys(
void *buf, paddr_t paddr, int size)
{
- return __hvm_copy(buf, paddr, size, 0, 0, 0);
+ return __hvm_copy(buf, paddr, size,
+ HVMCOPY_from_guest | HVMCOPY_fault | HVMCOPY_phys,
+ 0);
}
enum hvm_copy_result hvm_copy_to_guest_virt(
- unsigned long vaddr, void *buf, int size)
-{
- return __hvm_copy(buf, vaddr, size, 1, 2, 0);
+ unsigned long vaddr, void *buf, int size, uint32_t pfec)
+{
+ return __hvm_copy(buf, vaddr, size,
+ HVMCOPY_to_guest | HVMCOPY_fault | HVMCOPY_virt,
+ PFEC_page_present | PFEC_write_access | pfec);
}
enum hvm_copy_result hvm_copy_from_guest_virt(
- void *buf, unsigned long vaddr, int size)
-{
- return __hvm_copy(buf, vaddr, size, 0, 2, 0);
+ void *buf, unsigned long vaddr, int size, uint32_t pfec)
+{
+ return __hvm_copy(buf, vaddr, size,
+ HVMCOPY_from_guest | HVMCOPY_fault | HVMCOPY_virt,
+ PFEC_page_present | pfec);
}
enum hvm_copy_result hvm_fetch_from_guest_virt(
- void *buf, unsigned long vaddr, int size)
-{
- return __hvm_copy(buf, vaddr, size, 0, 2, hvm_nx_enabled(current));
+ void *buf, unsigned long vaddr, int size, uint32_t pfec)
+{
+ if ( hvm_nx_enabled(current) )
+ pfec |= PFEC_insn_fetch;
+ return __hvm_copy(buf, vaddr, size,
+ HVMCOPY_from_guest | HVMCOPY_fault | HVMCOPY_virt,
+ PFEC_page_present | pfec);
}
enum hvm_copy_result hvm_copy_to_guest_virt_nofault(
- unsigned long vaddr, void *buf, int size)
-{
- return __hvm_copy(buf, vaddr, size, 1, 1, 0);
+ unsigned long vaddr, void *buf, int size, uint32_t pfec)
+{
+ return __hvm_copy(buf, vaddr, size,
+ HVMCOPY_to_guest | HVMCOPY_no_fault | HVMCOPY_virt,
+ PFEC_page_present | PFEC_write_access | pfec);
}
enum hvm_copy_result hvm_copy_from_guest_virt_nofault(
- void *buf, unsigned long vaddr, int size)
-{
- return __hvm_copy(buf, vaddr, size, 0, 1, 0);
+ void *buf, unsigned long vaddr, int size, uint32_t pfec)
+{
+ return __hvm_copy(buf, vaddr, size,
+ HVMCOPY_from_guest | HVMCOPY_no_fault | HVMCOPY_virt,
+ PFEC_page_present | pfec);
}
enum hvm_copy_result hvm_fetch_from_guest_virt_nofault(
- void *buf, unsigned long vaddr, int size)
-{
- return __hvm_copy(buf, vaddr, size, 0, 1, hvm_nx_enabled(current));
+ void *buf, unsigned long vaddr, int size, uint32_t pfec)
+{
+ if ( hvm_nx_enabled(current) )
+ pfec |= PFEC_insn_fetch;
+ return __hvm_copy(buf, vaddr, size,
+ HVMCOPY_from_guest | HVMCOPY_no_fault | HVMCOPY_virt,
+ PFEC_page_present | pfec);
}
DEFINE_PER_CPU(int, guest_handles_in_xen_space);
-/* Note that copy_{to,from}_user_hvm require the PTE to be writable even
- when they're only trying to read from it. The guest is expected to
- deal with this. */
unsigned long copy_to_user_hvm(void *to, const void *from, unsigned len)
{
int rc;
@@ -1570,7 +1560,8 @@ unsigned long copy_to_user_hvm(void *to,
return 0;
}
- rc = hvm_copy_to_guest_virt_nofault((unsigned long)to, (void *)from, len);
+ rc = hvm_copy_to_guest_virt_nofault((unsigned long)to, (void *)from,
+ len, 0);
return rc ? len : 0; /* fake a copy_to_user() return code */
}
@@ -1584,7 +1575,7 @@ unsigned long copy_from_user_hvm(void *t
return 0;
}
- rc = hvm_copy_from_guest_virt_nofault(to, (unsigned long)from, len);
+ rc = hvm_copy_from_guest_virt_nofault(to, (unsigned long)from, len, 0);
return rc ? len : 0; /* fake a copy_from_user() return code */
}
diff -r 892a20f824a7 -r e7abfeee2808 xen/arch/x86/hvm/svm/emulate.c
--- a/xen/arch/x86/hvm/svm/emulate.c Thu Mar 27 17:14:41 2008 +0000
+++ b/xen/arch/x86/hvm/svm/emulate.c Thu Mar 27 17:25:22 2008 +0000
@@ -32,9 +32,11 @@ static int inst_copy_from_guest(
static int inst_copy_from_guest(
unsigned char *buf, unsigned long guest_eip, int inst_len)
{
+ struct vmcb_struct *vmcb = current->arch.hvm_svm.vmcb;
+ uint32_t pfec = (vmcb->cpl == 3) ? PFEC_user_mode : 0;
if ( (inst_len > MAX_INST_LEN) || (inst_len <= 0) )
return 0;
- if ( hvm_fetch_from_guest_virt_nofault(buf, guest_eip, inst_len) )
+ if ( hvm_fetch_from_guest_virt_nofault(buf, guest_eip, inst_len, pfec) )
return 0;
return inst_len;
}
diff -r 892a20f824a7 -r e7abfeee2808 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c Thu Mar 27 17:14:41 2008 +0000
+++ b/xen/arch/x86/mm/shadow/common.c Thu Mar 27 17:25:22 2008 +0000
@@ -152,9 +152,9 @@ hvm_read(enum x86_segment seg,
*val = 0;
if ( access_type == hvm_access_insn_fetch )
- rc = hvm_fetch_from_guest_virt(val, addr, bytes);
+ rc = hvm_fetch_from_guest_virt(val, addr, bytes, 0);
else
- rc = hvm_copy_from_guest_virt(val, addr, bytes);
+ rc = hvm_copy_from_guest_virt(val, addr, bytes, 0);
switch ( rc )
{
@@ -416,7 +416,7 @@ struct x86_emulate_ops *shadow_init_emul
x86_seg_cs, regs->eip, sizeof(sh_ctxt->insn_buf),
hvm_access_insn_fetch, sh_ctxt, &addr) &&
!hvm_fetch_from_guest_virt_nofault(
- sh_ctxt->insn_buf, addr, sizeof(sh_ctxt->insn_buf)))
+ sh_ctxt->insn_buf, addr, sizeof(sh_ctxt->insn_buf), 0))
? sizeof(sh_ctxt->insn_buf) : 0;
return &hvm_shadow_emulator_ops;
@@ -444,7 +444,7 @@ void shadow_continue_emulation(struct sh
x86_seg_cs, regs->eip, sizeof(sh_ctxt->insn_buf),
hvm_access_insn_fetch, sh_ctxt, &addr) &&
!hvm_fetch_from_guest_virt_nofault(
- sh_ctxt->insn_buf, addr, sizeof(sh_ctxt->insn_buf)))
+ sh_ctxt->insn_buf, addr, sizeof(sh_ctxt->insn_buf), 0))
? sizeof(sh_ctxt->insn_buf) : 0;
sh_ctxt->insn_buf_eip = regs->eip;
}
diff -r 892a20f824a7 -r e7abfeee2808 xen/arch/x86/x86_emulate.c
--- a/xen/arch/x86/x86_emulate.c Thu Mar 27 17:14:41 2008 +0000
+++ b/xen/arch/x86/x86_emulate.c Thu Mar 27 17:25:22 2008 +0000
@@ -787,7 +787,7 @@ _mode_iopl(
int cpl = get_cpl(ctxt, ops);
if ( cpl == -1 )
return -1;
- return ((cpl >= 0) && (cpl <= ((ctxt->regs->eflags >> 12) & 3)));
+ return (cpl <= ((ctxt->regs->eflags >> 12) & 3));
}
#define mode_ring0() ({ \
@@ -800,6 +800,50 @@ _mode_iopl(
fail_if(_iopl < 0); \
_iopl; \
})
+
+static int ioport_access_check(
+ unsigned int first_port,
+ unsigned int bytes,
+ struct x86_emulate_ctxt *ctxt,
+ struct x86_emulate_ops *ops)
+{
+ unsigned long iobmp;
+ struct segment_register tr;
+ int rc = X86EMUL_OKAY;
+
+ if ( !(ctxt->regs->eflags & EFLG_VM) && mode_iopl() )
+ return X86EMUL_OKAY;
+
+ fail_if(ops->read_segment == NULL);
+ if ( (rc = ops->read_segment(x86_seg_tr, &tr, ctxt)) != 0 )
+ return rc;
+
+ /* Ensure that the TSS is valid and has an io-bitmap-offset field. */
+ if ( !tr.attr.fields.p ||
+ ((tr.attr.fields.type & 0xd) != 0x9) ||
+ (tr.limit < 0x67) )
+ goto raise_exception;
+
+ if ( (rc = ops->read(x86_seg_none, tr.base + 0x66, &iobmp, 2, ctxt)) )
+ return rc;
+
+ /* Ensure TSS includes two bytes including byte containing first port. */
+ iobmp += first_port / 8;
+ if ( tr.limit <= iobmp )
+ goto raise_exception;
+
+ if ( (rc = ops->read(x86_seg_none, tr.base + iobmp, &iobmp, 2, ctxt)) )
+ return rc;
+ if ( (iobmp & (((1<<bytes)-1) << (first_port&7))) != 0 )
+ goto raise_exception;
+
+ done:
+ return rc;
+
+ raise_exception:
+ fail_if(ops->inject_hw_exception == NULL);
+ return ops->inject_hw_exception(EXC_GP, 0, ctxt) ? : X86EMUL_EXCEPTION;
+}
static int
in_realmode(
@@ -2265,12 +2309,14 @@ x86_emulate(
case 0x6c ... 0x6d: /* ins %dx,%es:%edi */ {
unsigned long nr_reps = get_rep_prefix();
+ unsigned int port = (uint16_t)_regs.edx;
dst.bytes = !(b & 1) ? 1 : (op_bytes == 8) ? 4 : op_bytes;
dst.mem.seg = x86_seg_es;
dst.mem.off = truncate_ea(_regs.edi);
+ if ( (rc = ioport_access_check(port, dst.bytes, ctxt, ops)) != 0 )
+ goto done;
if ( (nr_reps > 1) && (ops->rep_ins != NULL) &&
- ((rc = ops->rep_ins((uint16_t)_regs.edx, dst.mem.seg,
- dst.mem.off, dst.bytes,
+ ((rc = ops->rep_ins(port, dst.mem.seg, dst.mem.off, dst.bytes,
&nr_reps, ctxt)) != X86EMUL_UNHANDLEABLE) )
{
if ( rc != 0 )
@@ -2279,8 +2325,7 @@ x86_emulate(
else
{
fail_if(ops->read_io == NULL);
- if ( (rc = ops->read_io((uint16_t)_regs.edx, dst.bytes,
- &dst.val, ctxt)) != 0 )
+ if ( (rc = ops->read_io(port, dst.bytes, &dst.val, ctxt)) != 0 )
goto done;
dst.type = OP_MEM;
nr_reps = 1;
@@ -2294,10 +2339,13 @@ x86_emulate(
case 0x6e ... 0x6f: /* outs %esi,%dx */ {
unsigned long nr_reps = get_rep_prefix();
+ unsigned int port = (uint16_t)_regs.edx;
dst.bytes = !(b & 1) ? 1 : (op_bytes == 8) ? 4 : op_bytes;
+ if ( (rc = ioport_access_check(port, dst.bytes, ctxt, ops)) != 0 )
+ goto done;
if ( (nr_reps > 1) && (ops->rep_outs != NULL) &&
((rc = ops->rep_outs(ea.mem.seg, truncate_ea(_regs.esi),
- (uint16_t)_regs.edx, dst.bytes,
+ port, dst.bytes,
&nr_reps, ctxt)) != X86EMUL_UNHANDLEABLE) )
{
if ( rc != 0 )
@@ -2309,8 +2357,7 @@ x86_emulate(
&dst.val, dst.bytes, ctxt)) != 0 )
goto done;
fail_if(ops->write_io == NULL);
- if ( (rc = ops->write_io((uint16_t)_regs.edx, dst.bytes,
- dst.val, ctxt)) != 0 )
+ if ( (rc = ops->write_io(port, dst.bytes, dst.val, ctxt)) != 0 )
goto done;
nr_reps = 1;
}
@@ -2831,6 +2878,8 @@ x86_emulate(
? insn_fetch_type(uint8_t)
: (uint16_t)_regs.edx);
op_bytes = !(b & 1) ? 1 : (op_bytes == 8) ? 4 : op_bytes;
+ if ( (rc = ioport_access_check(port, op_bytes, ctxt, ops)) != 0 )
+ goto done;
if ( b & 2 )
{
/* out */
diff -r 892a20f824a7 -r e7abfeee2808 xen/include/asm-x86/hvm/support.h
--- a/xen/include/asm-x86/hvm/support.h Thu Mar 27 17:14:41 2008 +0000
+++ b/xen/include/asm-x86/hvm/support.h Thu Mar 27 17:25:22 2008 +0000
@@ -99,7 +99,11 @@ enum hvm_copy_result hvm_copy_from_guest
void *buf, paddr_t paddr, int size);
/*
- * Copy to/from a guest virtual address.
+ * Copy to/from a guest virtual address. @pfec should include PFEC_user_mode
+ * if emulating a user-mode access (CPL=3). All other flags in @pfec are
+ * managed by the called function: it is therefore optional for the caller
+ * to set them.
+ *
* Returns:
* HVMCOPY_okay: Copy was entirely successful.
* HVMCOPY_bad_gfn_to_mfn: Some guest physical address did not map to
@@ -110,22 +114,22 @@ enum hvm_copy_result hvm_copy_from_guest
* for injection into the current HVM VCPU.
*/
enum hvm_copy_result hvm_copy_to_guest_virt(
- unsigned long vaddr, void *buf, int size);
+ unsigned long vaddr, void *buf, int size, uint32_t pfec);
enum hvm_copy_result hvm_copy_from_guest_virt(
- void *buf, unsigned long vaddr, int size);
+ void *buf, unsigned long vaddr, int size, uint32_t pfec);
enum hvm_copy_result hvm_fetch_from_guest_virt(
- void *buf, unsigned long vaddr, int size);
+ void *buf, unsigned long vaddr, int size, uint32_t pfec);
/*
* As above (copy to/from a guest virtual address), but no fault is generated
* when HVMCOPY_bad_gva_to_gfn is returned.
*/
enum hvm_copy_result hvm_copy_to_guest_virt_nofault(
- unsigned long vaddr, void *buf, int size);
+ unsigned long vaddr, void *buf, int size, uint32_t pfec);
enum hvm_copy_result hvm_copy_from_guest_virt_nofault(
- void *buf, unsigned long vaddr, int size);
+ void *buf, unsigned long vaddr, int size, uint32_t pfec);
enum hvm_copy_result hvm_fetch_from_guest_virt_nofault(
- void *buf, unsigned long vaddr, int size);
+ void *buf, unsigned long vaddr, int size, uint32_t pfec);
void hvm_print_line(struct vcpu *v, const char c);
void hlt_timer_fn(void *data);
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