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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [IA64] iomem support for driver domains.
# HG changeset patch
# User awilliam@xxxxxxxxxxx
# Node ID 7be1cfe8345b6bf09e66f037de6fd59c3bb0f706
# Parent 48d7d00e69e5e1558fc06d6c4503f9ab23b6a933
[IA64] iomem support for driver domains.
First steps in hypevisor to support driver domains.
IO ports capabilities added (not yet used).
IO mem capabilities checked.
ASSIGN_nocache flag added.
Memory attributes checked.
Signed-off-by: Tristan Gingold <tristan.gingold@xxxxxxxx>
---
xen/arch/ia64/xen/dom0_ops.c | 44 ++++++++++++++-
xen/arch/ia64/xen/domain.c | 5 +
xen/arch/ia64/xen/mm.c | 119 ++++++++++++++++++++++++++---------------
xen/include/asm-ia64/domain.h | 4 +
xen/include/asm-ia64/iocap.h | 7 ++
xen/include/public/arch-ia64.h | 3 +
6 files changed, 138 insertions(+), 44 deletions(-)
diff -r 48d7d00e69e5 -r 7be1cfe8345b xen/arch/ia64/xen/dom0_ops.c
--- a/xen/arch/ia64/xen/dom0_ops.c Thu Jul 27 09:17:54 2006 -0600
+++ b/xen/arch/ia64/xen/dom0_ops.c Thu Jul 27 09:47:10 2006 -0600
@@ -20,6 +20,7 @@
#include <public/sched_ctl.h>
#include <asm/vmx.h>
#include <asm/dom_fw.h>
+#include <xen/iocap.h>
void build_physmap_table(struct domain *d);
@@ -279,6 +280,29 @@ long arch_do_dom0_op(dom0_op_t *op, XEN_
}
break;
+ case DOM0_IOPORT_PERMISSION:
+ {
+ struct domain *d;
+ unsigned int fp = op->u.ioport_permission.first_port;
+ unsigned int np = op->u.ioport_permission.nr_ports;
+
+ ret = -ESRCH;
+ d = find_domain_by_id(op->u.ioport_permission.domain);
+ if (unlikely(d == NULL))
+ break;
+
+ if (np == 0)
+ ret = 0;
+ else {
+ if (op->u.ioport_permission.allow_access)
+ ret = ioports_permit_access(d, fp, fp + np - 1);
+ else
+ ret = ioports_deny_access(d, fp, fp + np - 1);
+ }
+
+ put_domain(d);
+ }
+ break;
default:
printf("arch_do_dom0_op: unrecognized dom0 op: %d!!!\n",op->cmd);
ret = -ENOSYS;
@@ -289,6 +313,24 @@ long arch_do_dom0_op(dom0_op_t *op, XEN_
}
#ifdef CONFIG_XEN_IA64_DOM0_VP
+static unsigned long
+dom0vp_ioremap(struct domain *d, unsigned long mpaddr, unsigned long size)
+{
+ unsigned long end;
+
+ /* Linux may use a 0 size! */
+ if (size == 0)
+ size = PAGE_SIZE;
+
+ end = PAGE_ALIGN(mpaddr + size);
+
+ if (!iomem_access_permitted(d, mpaddr >> PAGE_SHIFT,
+ (end >> PAGE_SHIFT) - 1))
+ return -EPERM;
+
+ return assign_domain_mmio_page(d, mpaddr, size);
+}
+
unsigned long
do_dom0vp_op(unsigned long cmd,
unsigned long arg0, unsigned long arg1, unsigned long arg2,
@@ -299,7 +341,7 @@ do_dom0vp_op(unsigned long cmd,
switch (cmd) {
case IA64_DOM0VP_ioremap:
- ret = assign_domain_mmio_page(d, arg0, arg1);
+ ret = dom0vp_ioremap(d, arg0, arg1);
break;
case IA64_DOM0VP_phystomach:
ret = ____lookup_domain_mpa(d, arg0 << PAGE_SHIFT);
diff -r 48d7d00e69e5 -r 7be1cfe8345b xen/arch/ia64/xen/domain.c
--- a/xen/arch/ia64/xen/domain.c Thu Jul 27 09:17:54 2006 -0600
+++ b/xen/arch/ia64/xen/domain.c Thu Jul 27 09:47:10 2006 -0600
@@ -360,6 +360,9 @@ int arch_domain_create(struct domain *d)
if ((d->arch.mm.pgd = pgd_alloc(&d->arch.mm)) == NULL)
goto fail_nomem;
+ d->arch.ioport_caps = rangeset_new(d, "I/O Ports",
+ RANGESETF_prettyprint_hex);
+
printf ("arch_domain_create: domain=%p\n", d);
return 0;
@@ -885,6 +888,8 @@ static void physdev_init_dom0(struct dom
BUG();
if (irqs_permit_access(d, 0, NR_IRQS-1))
BUG();
+ if (ioports_permit_access(d, 0, 0xffff))
+ BUG();
}
int construct_dom0(struct domain *d,
diff -r 48d7d00e69e5 -r 7be1cfe8345b xen/arch/ia64/xen/mm.c
--- a/xen/arch/ia64/xen/mm.c Thu Jul 27 09:17:54 2006 -0600
+++ b/xen/arch/ia64/xen/mm.c Thu Jul 27 09:47:10 2006 -0600
@@ -418,13 +418,13 @@ u64 translate_domain_pte(u64 pteval, u64
u64 mask, mpaddr, pteval2;
u64 arflags;
u64 arflags2;
+ u64 maflags2;
pteval &= ((1UL << 53) - 1);// ignore [63:53] bits
// FIXME address had better be pre-validated on insert
mask = ~itir_mask(itir.itir);
- mpaddr = (((pteval & ~_PAGE_ED) & _PAGE_PPN_MASK) & ~mask) |
- (address & mask);
+ mpaddr = ((pteval & _PAGE_PPN_MASK) & ~mask) | (address & mask);
#ifdef CONFIG_XEN_IA64_DOM0_VP
if (itir.ps > PAGE_SHIFT) {
itir.ps = PAGE_SHIFT;
@@ -454,6 +454,8 @@ u64 translate_domain_pte(u64 pteval, u64
}
#endif
pteval2 = lookup_domain_mpa(d, mpaddr, entry);
+
+ /* Check access rights. */
arflags = pteval & _PAGE_AR_MASK;
arflags2 = pteval2 & _PAGE_AR_MASK;
if (arflags != _PAGE_AR_R && arflags2 == _PAGE_AR_R) {
@@ -466,36 +468,53 @@ u64 translate_domain_pte(u64 pteval, u64
pteval2, arflags2, mpaddr);
#endif
pteval = (pteval & ~_PAGE_AR_MASK) | _PAGE_AR_R;
- }
-
- pteval2 &= _PAGE_PPN_MASK; // ignore non-addr bits
- pteval2 |= (pteval & _PAGE_ED);
- pteval2 |= _PAGE_PL_2; // force PL0->2 (PL3 is unaffected)
- pteval2 |= (pteval & ~_PAGE_PPN_MASK);
- /*
- * Don't let non-dom0 domains map uncached addresses. This can
- * happen when domU tries to touch i/o port space. Also prevents
- * possible address aliasing issues.
- * WB => WB
- * UC, UCE, WC => WB
- * NaTPage => NaTPage
- */
- if (d != dom0 && (pteval2 & _PAGE_MA_MASK) != _PAGE_MA_NAT)
- pteval2 &= ~_PAGE_MA_MASK;
-
- /* If shadow mode is enabled, virtualize dirty bit. */
- if (shadow_mode_enabled(d) && (pteval2 & _PAGE_D)) {
- u64 mp_page = mpaddr >> PAGE_SHIFT;
- pteval2 |= _PAGE_VIRT_D;
-
- /* If the page is not already dirty, don't set the dirty bit.
- This is a small optimization! */
- if (mp_page < d->arch.shadow_bitmap_size * 8
- && !test_bit(mp_page, d->arch.shadow_bitmap))
- pteval2 = (pteval2 & ~_PAGE_D);
- }
-
- return pteval2;
+ }
+
+ /* Check memory attribute. The switch is on the *requested* memory
+ attribute. */
+ maflags2 = pteval2 & _PAGE_MA_MASK;
+ switch (pteval & _PAGE_MA_MASK) {
+ case _PAGE_MA_NAT:
+ /* NaT pages are always accepted! */
+ break;
+ case _PAGE_MA_UC:
+ case _PAGE_MA_UCE:
+ case _PAGE_MA_WC:
+ if (maflags2 == _PAGE_MA_WB) {
+ /* Don't let domains WB-map uncached addresses.
+ This can happen when domU tries to touch i/o
+ port space. Also prevents possible address
+ aliasing issues. */
+ printf("Warning: UC to WB for mpaddr=%lx\n", mpaddr);
+ pteval = (pteval & ~_PAGE_MA_MASK) | _PAGE_MA_WB;
+ }
+ break;
+ case _PAGE_MA_WB:
+ if (maflags2 != _PAGE_MA_WB) {
+ /* Forbid non-coherent access to coherent memory. */
+ panic_domain(NULL, "try to use WB mem attr on "
+ "UC page, mpaddr=%lx\n", mpaddr);
+ }
+ break;
+ default:
+ panic_domain(NULL, "try to use unknown mem attribute\n");
+ }
+
+ /* If shadow mode is enabled, virtualize dirty bit. */
+ if (shadow_mode_enabled(d) && (pteval & _PAGE_D)) {
+ u64 mp_page = mpaddr >> PAGE_SHIFT;
+ pteval |= _PAGE_VIRT_D;
+
+ /* If the page is not already dirty, don't set the dirty bit! */
+ if (mp_page < d->arch.shadow_bitmap_size * 8
+ && !test_bit(mp_page, d->arch.shadow_bitmap))
+ pteval &= ~_PAGE_D;
+ }
+
+ /* Ignore non-addr bits of pteval2 and force PL0->2
+ (PL3 is unaffected) */
+ return (pteval & ~_PAGE_PPN_MASK) |
+ (pteval2 & _PAGE_PPN_MASK) | _PAGE_PL_2;
}
// given a current domain metaphysical address, return the physical address
@@ -823,8 +842,19 @@ assign_new_domain0_page(struct domain *d
#endif
}
+static unsigned long
+flags_to_prot (unsigned long flags)
+{
+ unsigned long res = _PAGE_PL_2 | __DIRTY_BITS;
+
+ res |= flags & ASSIGN_readonly ? _PAGE_AR_R: _PAGE_AR_RWX;
+ res |= flags & ASSIGN_nocache ? _PAGE_MA_UC: _PAGE_MA_WB;
+
+ return res;
+}
+
/* map a physical address to the specified metaphysical addr */
-// flags: currently only ASSIGN_readonly
+// flags: currently only ASSIGN_readonly, ASSIGN_nocache
// This is called by assign_domain_mmio_page().
// So accessing to pte is racy.
void
@@ -836,13 +866,12 @@ __assign_domain_page(struct domain *d,
pte_t old_pte;
pte_t new_pte;
pte_t ret_pte;
- unsigned long arflags = (flags & ASSIGN_readonly)? _PAGE_AR_R:
_PAGE_AR_RWX;
+ unsigned long prot = flags_to_prot(flags);
pte = lookup_alloc_domain_pte(d, mpaddr);
old_pte = __pte(0);
- new_pte = pfn_pte(physaddr >> PAGE_SHIFT,
- __pgprot(__DIRTY_BITS | _PAGE_PL_2 | arflags));
+ new_pte = pfn_pte(physaddr >> PAGE_SHIFT, __pgprot(prot));
ret_pte = ptep_cmpxchg_rel(&d->arch.mm, mpaddr, pte, old_pte, new_pte);
if (pte_val(ret_pte) == pte_val(old_pte))
smp_mb();
@@ -941,7 +970,7 @@ assign_domain_mmio_page(struct domain *d
__func__, __LINE__, d, mpaddr, size);
return -EINVAL;
}
- assign_domain_same_page(d, mpaddr, size, ASSIGN_writable);
+ assign_domain_same_page(d, mpaddr, size, ASSIGN_writable | ASSIGN_nocache);
return mpaddr;
}
@@ -967,11 +996,12 @@ assign_domain_page_replace(struct domain
volatile pte_t* pte;
pte_t old_pte;
pte_t npte;
- unsigned long arflags = (flags & ASSIGN_readonly)? _PAGE_AR_R:
_PAGE_AR_RWX;
+ unsigned long prot = flags_to_prot(flags);
+
pte = lookup_alloc_domain_pte(d, mpaddr);
// update pte
- npte = pfn_pte(mfn, __pgprot(__DIRTY_BITS | _PAGE_PL_2 | arflags));
+ npte = pfn_pte(mfn, __pgprot(prot));
old_pte = ptep_xchg(mm, mpaddr, pte, npte);
if (pte_mem(old_pte)) {
unsigned long old_mfn = pte_pfn(old_pte);
@@ -1013,7 +1043,7 @@ assign_domain_page_cmpxchg_rel(struct do
unsigned long old_arflags;
pte_t old_pte;
unsigned long new_mfn;
- unsigned long new_arflags;
+ unsigned long new_prot;
pte_t new_pte;
pte_t ret_pte;
@@ -1029,10 +1059,9 @@ assign_domain_page_cmpxchg_rel(struct do
return -EINVAL;
}
- new_arflags = (flags & ASSIGN_readonly)? _PAGE_AR_R: _PAGE_AR_RWX;
+ new_prot = flags_to_prot(flags);
new_mfn = page_to_mfn(new_page);
- new_pte = pfn_pte(new_mfn,
- __pgprot(__DIRTY_BITS | _PAGE_PL_2 | new_arflags));
+ new_pte = pfn_pte(new_mfn, __pgprot(new_prot));
// update pte
ret_pte = ptep_cmpxchg_rel(mm, mpaddr, pte, old_pte, new_pte);
@@ -1151,6 +1180,10 @@ dom0vp_add_physmap(struct domain* d, uns
{
int error = 0;
struct domain* rd;
+
+ /* Not allowed by a domain. */
+ if (flags & ASSIGN_nocache)
+ return -EINVAL;
rd = find_domain_by_id(domid);
if (unlikely(rd == NULL)) {
diff -r 48d7d00e69e5 -r 7be1cfe8345b xen/include/asm-ia64/domain.h
--- a/xen/include/asm-ia64/domain.h Thu Jul 27 09:17:54 2006 -0600
+++ b/xen/include/asm-ia64/domain.h Thu Jul 27 09:47:10 2006 -0600
@@ -11,6 +11,7 @@
#include <xen/list.h>
#include <xen/cpumask.h>
#include <asm/fpswa.h>
+#include <xen/rangeset.h>
struct p2m_entry {
volatile pte_t* pte;
@@ -86,6 +87,9 @@ struct arch_domain {
unsigned int is_vti : 1;
};
};
+
+ /* Allowed accesses to io ports. */
+ struct rangeset *ioport_caps;
/* There are two ranges of RID for a domain:
one big range, used to virtualize domain RID,
diff -r 48d7d00e69e5 -r 7be1cfe8345b xen/include/asm-ia64/iocap.h
--- a/xen/include/asm-ia64/iocap.h Thu Jul 27 09:17:54 2006 -0600
+++ b/xen/include/asm-ia64/iocap.h Thu Jul 27 09:47:10 2006 -0600
@@ -7,4 +7,11 @@
#ifndef __IA64_IOCAP_H__
#define __IA64_IOCAP_H__
+#define ioports_permit_access(d, s, e) \
+ rangeset_add_range((d)->arch.ioport_caps, s, e)
+#define ioports_deny_access(d, s, e) \
+ rangeset_remove_range((d)->arch.ioport_caps, s, e)
+#define ioports_access_permitted(d, s, e) \
+ rangeset_contains_range((d)->arch.ioport_caps, s, e)
+
#endif /* __IA64_IOCAP_H__ */
diff -r 48d7d00e69e5 -r 7be1cfe8345b xen/include/public/arch-ia64.h
--- a/xen/include/public/arch-ia64.h Thu Jul 27 09:17:54 2006 -0600
+++ b/xen/include/public/arch-ia64.h Thu Jul 27 09:47:10 2006 -0600
@@ -359,6 +359,9 @@ DEFINE_XEN_GUEST_HANDLE(vcpu_guest_conte
#define _ASSIGN_readonly 0
#define ASSIGN_readonly (1UL << _ASSIGN_readonly)
#define ASSIGN_writable (0UL << _ASSIGN_readonly) // dummy flag
+/* Internal only: memory attribute must be WC/UC/UCE. */
+#define _ASSIGN_nocache 1
+#define ASSIGN_nocache (1UL << _ASSIGN_nocache)
/* This structure has the same layout of struct ia64_boot_param, defined in
<asm/system.h>. It is redefined here to ease use. */
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