|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/3] x86/mm: drop guest_{map, get_eff}_l1e() hooks
Disallow the unmaintained and presumed broken translated-but-not-
external paging mode combination, allowing the respective paging hooks
to go away (which eliminates one pair of NULL callbacks in HAP mode).
As a result of them no longer being generic paging operations, make the
inline functions private to mm.c, dropping their struct vcpu parameters
where suitable.
The enforcement of the proper mode combination gets now done in
paging_enable(), requiring shadow_domctl() to no longer call
shadow_enable() directly.
Also as a result support for XEN_DOMCTL_SHADOW_OP_ENABLE_TRANSLATE gets
removed too.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -516,6 +516,67 @@ void update_cr3(struct vcpu *v)
make_cr3(v, cr3_mfn);
}
+/* Get a mapping of a PV guest's l1e for this virtual address. */
+static l1_pgentry_t *guest_map_l1e(unsigned long addr, unsigned long *gl1mfn)
+{
+ l2_pgentry_t l2e;
+
+ ASSERT(!paging_mode_translate(current->domain));
+ ASSERT(!paging_mode_external(current->domain));
+
+ if ( unlikely(!__addr_ok(addr)) )
+ return NULL;
+
+ /* Find this l1e and its enclosing l1mfn in the linear map. */
+ if ( __copy_from_user(&l2e,
+ &__linear_l2_table[l2_linear_offset(addr)],
+ sizeof(l2_pgentry_t)) )
+ return NULL;
+
+ /* Check flags that it will be safe to read the l1e. */
+ if ( (l2e_get_flags(l2e) & (_PAGE_PRESENT | _PAGE_PSE)) != _PAGE_PRESENT )
+ return NULL;
+
+ *gl1mfn = l2e_get_pfn(l2e);
+
+ return (l1_pgentry_t *)map_domain_page(_mfn(*gl1mfn)) +
+ l1_table_offset(addr);
+}
+
+/* Pull down the mapping we got from guest_map_l1e(). */
+static inline void guest_unmap_l1e(void *p)
+{
+ unmap_domain_page(p);
+}
+
+/* Read a PV guest's l1e that maps this virtual address. */
+static inline void guest_get_eff_l1e(unsigned long addr, l1_pgentry_t *eff_l1e)
+{
+ ASSERT(!paging_mode_translate(current->domain));
+ ASSERT(!paging_mode_external(current->domain));
+
+ if ( unlikely(!__addr_ok(addr)) ||
+ __copy_from_user(eff_l1e,
+ &__linear_l1_table[l1_linear_offset(addr)],
+ sizeof(l1_pgentry_t)) )
+ *eff_l1e = l1e_empty();
+}
+
+/*
+ * Read the guest's l1e that maps this address, from the kernel-mode
+ * page tables.
+ */
+static inline void guest_get_eff_kern_l1e(struct vcpu *v, unsigned long addr,
+ void *eff_l1e)
+{
+ bool_t user_mode = !(v->arch.flags & TF_kernel_mode);
+#define TOGGLE_MODE() if ( user_mode ) toggle_guest_mode(v)
+
+ TOGGLE_MODE();
+ guest_get_eff_l1e(addr, eff_l1e);
+ TOGGLE_MODE();
+}
+
static const char __section(".bss.page_aligned") zero_page[PAGE_SIZE];
static void invalidate_shadow_ldt(struct vcpu *v, int flush)
@@ -3985,7 +4046,7 @@ static int create_grant_va_mapping(
adjust_guest_l1e(nl1e, d);
- pl1e = guest_map_l1e(v, va, &gl1mfn);
+ pl1e = guest_map_l1e(va, &gl1mfn);
if ( !pl1e )
{
MEM_LOG("Could not find L1 PTE for address %lx", va);
@@ -3994,7 +4055,7 @@ static int create_grant_va_mapping(
if ( !get_page_from_pagenr(gl1mfn, current->domain) )
{
- guest_unmap_l1e(v, pl1e);
+ guest_unmap_l1e(pl1e);
return GNTST_general_error;
}
@@ -4002,7 +4063,7 @@ static int create_grant_va_mapping(
if ( !page_lock(l1pg) )
{
put_page(l1pg);
- guest_unmap_l1e(v, pl1e);
+ guest_unmap_l1e(pl1e);
return GNTST_general_error;
}
@@ -4010,7 +4071,7 @@ static int create_grant_va_mapping(
{
page_unlock(l1pg);
put_page(l1pg);
- guest_unmap_l1e(v, pl1e);
+ guest_unmap_l1e(pl1e);
return GNTST_general_error;
}
@@ -4019,7 +4080,7 @@ static int create_grant_va_mapping(
page_unlock(l1pg);
put_page(l1pg);
- guest_unmap_l1e(v, pl1e);
+ guest_unmap_l1e(pl1e);
if ( okay && !paging_mode_refcounts(d) )
put_page_from_l1e(ol1e, d);
@@ -4035,7 +4096,7 @@ static int replace_grant_va_mapping(
struct page_info *l1pg;
int rc = 0;
- pl1e = guest_map_l1e(v, addr, &gl1mfn);
+ pl1e = guest_map_l1e(addr, &gl1mfn);
if ( !pl1e )
{
MEM_LOG("Could not find L1 PTE for address %lx", addr);
@@ -4085,7 +4146,7 @@ static int replace_grant_va_mapping(
page_unlock(l1pg);
put_page(l1pg);
out:
- guest_unmap_l1e(v, pl1e);
+ guest_unmap_l1e(pl1e);
return rc;
}
@@ -4197,7 +4258,7 @@ int replace_grant_host_mapping(
if ( !new_addr )
return destroy_grant_va_mapping(addr, frame, curr);
- pl1e = guest_map_l1e(curr, new_addr, &gl1mfn);
+ pl1e = guest_map_l1e(new_addr, &gl1mfn);
if ( !pl1e )
{
MEM_LOG("Could not find L1 PTE for address %lx",
@@ -4207,7 +4268,7 @@ int replace_grant_host_mapping(
if ( !get_page_from_pagenr(gl1mfn, current->domain) )
{
- guest_unmap_l1e(curr, pl1e);
+ guest_unmap_l1e(pl1e);
return GNTST_general_error;
}
@@ -4215,7 +4276,7 @@ int replace_grant_host_mapping(
if ( !page_lock(l1pg) )
{
put_page(l1pg);
- guest_unmap_l1e(curr, pl1e);
+ guest_unmap_l1e(pl1e);
return GNTST_general_error;
}
@@ -4223,7 +4284,7 @@ int replace_grant_host_mapping(
{
page_unlock(l1pg);
put_page(l1pg);
- guest_unmap_l1e(curr, pl1e);
+ guest_unmap_l1e(pl1e);
return GNTST_general_error;
}
@@ -4235,13 +4296,13 @@ int replace_grant_host_mapping(
page_unlock(l1pg);
put_page(l1pg);
MEM_LOG("Cannot delete PTE entry at %p", (unsigned long *)pl1e);
- guest_unmap_l1e(curr, pl1e);
+ guest_unmap_l1e(pl1e);
return GNTST_general_error;
}
page_unlock(l1pg);
put_page(l1pg);
- guest_unmap_l1e(curr, pl1e);
+ guest_unmap_l1e(pl1e);
rc = replace_grant_va_mapping(addr, frame, ol1e, curr);
if ( rc && !paging_mode_refcounts(curr->domain) )
@@ -4359,7 +4420,7 @@ static int __do_update_va_mapping(
return rc;
rc = -EINVAL;
- pl1e = guest_map_l1e(v, va, &gl1mfn);
+ pl1e = guest_map_l1e(va, &gl1mfn);
if ( unlikely(!pl1e || !get_page_from_pagenr(gl1mfn, d)) )
goto out;
@@ -4384,7 +4445,7 @@ static int __do_update_va_mapping(
out:
if ( pl1e )
- guest_unmap_l1e(v, pl1e);
+ guest_unmap_l1e(pl1e);
switch ( flags & UVMF_FLUSHTYPE_MASK )
{
@@ -5229,7 +5290,7 @@ int ptwr_do_page_fault(struct vcpu *v, u
int rc;
/* Attempt to read the PTE that maps the VA being accessed. */
- guest_get_eff_l1e(v, addr, &pte);
+ guest_get_eff_l1e(addr, &pte);
/* We are looking only for read-only mappings of p.t. pages. */
if ( ((l1e_get_flags(pte) & (_PAGE_PRESENT|_PAGE_RW)) != _PAGE_PRESENT) ||
@@ -5359,7 +5420,7 @@ int mmio_ro_do_page_fault(struct vcpu *v
int rc;
/* Attempt to read the PTE that maps the VA being accessed. */
- guest_get_eff_l1e(v, addr, &pte);
+ guest_get_eff_l1e(addr, &pte);
/* We are looking only for read-only mappings of MMIO pages. */
if ( ((l1e_get_flags(pte) & (_PAGE_PRESENT|_PAGE_RW)) != _PAGE_PRESENT) )
--- a/xen/arch/x86/mm/paging.c
+++ b/xen/arch/x86/mm/paging.c
@@ -844,6 +844,15 @@ void paging_final_teardown(struct domain
* creation. */
int paging_enable(struct domain *d, u32 mode)
{
+ switch ( mode & (PG_external | PG_translate) )
+ {
+ case 0:
+ case PG_external | PG_translate:
+ break;
+ default:
+ return -EINVAL;
+ }
+
if ( hap_enabled(d) )
return hap_enable(d, mode | PG_HAP_enable);
else
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -2921,8 +2921,7 @@ int shadow_enable(struct domain *d, u32
/* Sanity check the arguments */
if ( shadow_mode_enabled(d) ||
- ((mode & PG_translate) && !(mode & PG_refcounts)) ||
- ((mode & PG_external) && !(mode & PG_translate)) )
+ ((mode & PG_translate) && !(mode & PG_refcounts)) )
{
rv = -EINVAL;
goto out_unlocked;
@@ -3668,11 +3667,8 @@ int shadow_domctl(struct domain *d,
case XEN_DOMCTL_SHADOW_OP_ENABLE_TEST:
return shadow_test_enable(d);
- case XEN_DOMCTL_SHADOW_OP_ENABLE_TRANSLATE:
- return shadow_enable(d, PG_refcounts|PG_translate);
-
case XEN_DOMCTL_SHADOW_OP_ENABLE:
- return shadow_enable(d, sc->mode << PG_mode_shift);
+ return paging_enable(d, sc->mode << PG_mode_shift);
case XEN_DOMCTL_SHADOW_OP_GET_ALLOCATION:
sc->mb = shadow_get_allocation(d);
--- a/xen/arch/x86/mm/shadow/multi.c
+++ b/xen/arch/x86/mm/shadow/multi.c
@@ -370,44 +370,6 @@ static void sh_audit_gw(struct vcpu *v,
#if (CONFIG_PAGING_LEVELS == GUEST_PAGING_LEVELS)
-static void *
-sh_guest_map_l1e(struct vcpu *v, unsigned long addr,
- unsigned long *gl1mfn)
-{
- void *pl1e = NULL;
- walk_t gw;
-
- ASSERT(shadow_mode_translate(v->domain));
-
- // XXX -- this is expensive, but it's easy to cobble together...
- // FIXME!
-
- if ( sh_walk_guest_tables(v, addr, &gw, PFEC_page_present) == 0
- && mfn_valid(gw.l1mfn) )
- {
- if ( gl1mfn )
- *gl1mfn = mfn_x(gw.l1mfn);
- pl1e = map_domain_page(gw.l1mfn) +
- (guest_l1_table_offset(addr) * sizeof(guest_l1e_t));
- }
-
- return pl1e;
-}
-
-static void
-sh_guest_get_eff_l1e(struct vcpu *v, unsigned long addr, void *eff_l1e)
-{
- walk_t gw;
-
- ASSERT(shadow_mode_translate(v->domain));
-
- // XXX -- this is expensive, but it's easy to cobble together...
- // FIXME!
-
- (void) sh_walk_guest_tables(v, addr, &gw, PFEC_page_present);
- *(guest_l1e_t *)eff_l1e = gw.l1e;
-}
-
/*
* Write a new value into the guest pagetable, and update the shadows
* appropriately. Returns 0 if we page-faulted, 1 for success.
@@ -5235,8 +5197,6 @@ const struct paging_mode sh_paging_mode
#if CONFIG_PAGING_LEVELS == GUEST_PAGING_LEVELS
.write_guest_entry = sh_write_guest_entry,
.cmpxchg_guest_entry = sh_cmpxchg_guest_entry,
- .guest_map_l1e = sh_guest_map_l1e,
- .guest_get_eff_l1e = sh_guest_get_eff_l1e,
#endif
.guest_levels = GUEST_PAGING_LEVELS,
.shadow.detach_old_tables = sh_detach_old_tables,
--- a/xen/include/asm-x86/paging.h
+++ b/xen/include/asm-x86/paging.h
@@ -124,10 +124,7 @@ struct paging_mode {
int (*cmpxchg_guest_entry )(struct vcpu *v, intpte_t *p,
intpte_t *old, intpte_t new,
mfn_t gmfn);
- void * (*guest_map_l1e )(struct vcpu *v, unsigned long va,
- unsigned long *gl1mfn);
- void (*guest_get_eff_l1e )(struct vcpu *v, unsigned long va,
- void *eff_l1e);
+
unsigned int guest_levels;
/* paging support extension */
@@ -355,80 +352,6 @@ void pagetable_dying(struct domain *d, p
void paging_dump_domain_info(struct domain *d);
void paging_dump_vcpu_info(struct vcpu *v);
-
-/*****************************************************************************
- * Access to the guest pagetables */
-
-/* Get a mapping of a PV guest's l1e for this virtual address. */
-static inline l1_pgentry_t *
-guest_map_l1e(struct vcpu *v, unsigned long addr, unsigned long *gl1mfn)
-{
- l2_pgentry_t l2e;
-
- if ( unlikely(!__addr_ok(addr)) )
- return NULL;
-
- if ( unlikely(paging_mode_translate(v->domain)) )
- return paging_get_hostmode(v)->guest_map_l1e(v, addr, gl1mfn);
-
- /* Find this l1e and its enclosing l1mfn in the linear map */
- if ( __copy_from_user(&l2e,
- &__linear_l2_table[l2_linear_offset(addr)],
- sizeof(l2_pgentry_t)) != 0 )
- return NULL;
- /* Check flags that it will be safe to read the l1e */
- if ( (l2e_get_flags(l2e) & (_PAGE_PRESENT | _PAGE_PSE))
- != _PAGE_PRESENT )
- return NULL;
- *gl1mfn = l2e_get_pfn(l2e);
- return (l1_pgentry_t *)map_domain_page(_mfn(*gl1mfn)) +
l1_table_offset(addr);
-}
-
-/* Pull down the mapping we got from guest_map_l1e() */
-static inline void
-guest_unmap_l1e(struct vcpu *v, void *p)
-{
- unmap_domain_page(p);
-}
-
-/* Read the guest's l1e that maps this address. */
-static inline void
-guest_get_eff_l1e(struct vcpu *v, unsigned long addr, l1_pgentry_t *eff_l1e)
-{
- if ( unlikely(!__addr_ok(addr)) )
- {
- *eff_l1e = l1e_empty();
- return;
- }
-
- if ( likely(!paging_mode_translate(v->domain)) )
- {
- ASSERT(!paging_mode_external(v->domain));
- if ( __copy_from_user(eff_l1e,
- &__linear_l1_table[l1_linear_offset(addr)],
- sizeof(l1_pgentry_t)) != 0 )
- *eff_l1e = l1e_empty();
- return;
- }
-
- paging_get_hostmode(v)->guest_get_eff_l1e(v, addr, eff_l1e);
-}
-
-/* Read the guest's l1e that maps this address, from the kernel-mode
- * pagetables. */
-static inline void
-guest_get_eff_kern_l1e(struct vcpu *v, unsigned long addr, void *eff_l1e)
-{
- int user_mode = !(v->arch.flags & TF_kernel_mode);
-#define TOGGLE_MODE() if ( user_mode ) toggle_guest_mode(v)
-
- TOGGLE_MODE();
- guest_get_eff_l1e(v, addr, eff_l1e);
- TOGGLE_MODE();
-}
-
-
-
#endif /* XEN_PAGING_H */
/*
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -190,8 +190,11 @@ struct xen_domctl_getpageframeinfo3 {
#define XEN_DOMCTL_SHADOW_OP_ENABLE_TEST 1
/* Equiv. to ENABLE with mode flag ENABLE_LOG_DIRTY. */
#define XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY 2
- /* Equiv. to ENABLE with mode flags ENABLE_REFCOUNT and ENABLE_TRANSLATE. */
+ /*
+ * No longer supported, was equiv. to ENABLE with mode flags
+ * ENABLE_REFCOUNT and ENABLE_TRANSLATE:
#define XEN_DOMCTL_SHADOW_OP_ENABLE_TRANSLATE 3
+ */
/* Mode flags for XEN_DOMCTL_SHADOW_OP_ENABLE. */
/*
Attachment:
x86-drop-guest-map-get-l1e-hooks.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |