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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Make shadow translate mode work for unprivileged, uniprocessor guests
# HG changeset patch
# User sos22@xxxxxxxxxxxxxxxxxxxx
# Node ID 43c294aea9ecbace908d321829a9f31e2c6f7a29
# Parent 860fa26845c242eac64dbef60bc2fec42cfacc8c
Make shadow translate mode work for unprivileged, uniprocessor guests
with no devices on plain 32 bit non-PAE hosts.
Signed-off-by: Steven Smith, sos22@xxxxxxxxx
diff -r 860fa26845c2 -r 43c294aea9ec tools/libxc/xc_linux_build.c
--- a/tools/libxc/xc_linux_build.c Wed Jan 25 16:14:19 2006
+++ b/tools/libxc/xc_linux_build.c Wed Jan 25 16:15:11 2006
@@ -60,16 +60,18 @@
return 0;
}
-#define alloc_pt(ltab, vltab) \
+#define alloc_pt(ltab, vltab, pltab) \
do { \
- ltab = (uint64_t)page_array[ppt_alloc++] << PAGE_SHIFT; \
+ pltab = ppt_alloc++; \
+ ltab = (uint64_t)page_array[pltab] << PAGE_SHIFT; \
+ pltab <<= PAGE_SHIFT; \
if ( vltab != NULL ) \
munmap(vltab, PAGE_SIZE); \
if ( (vltab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE, \
PROT_READ|PROT_WRITE, \
ltab >> PAGE_SHIFT)) == NULL ) \
goto error_out; \
- memset(vltab, 0, PAGE_SIZE); \
+ memset(vltab, 0x0, PAGE_SIZE); \
} while ( 0 )
#if defined(__i386__)
@@ -80,33 +82,42 @@
unsigned long v_end,
unsigned long *page_array,
unsigned long vpt_start,
- unsigned long vpt_end)
+ unsigned long vpt_end,
+ unsigned shadow_mode_enabled)
{
l1_pgentry_t *vl1tab=NULL, *vl1e=NULL;
l2_pgentry_t *vl2tab=NULL, *vl2e=NULL;
- unsigned long l1tab = 0;
- unsigned long l2tab = 0;
+ unsigned long l1tab = 0, pl1tab;
+ unsigned long l2tab = 0, pl2tab;
unsigned long ppt_alloc;
unsigned long count;
ppt_alloc = (vpt_start - dsi_v_start) >> PAGE_SHIFT;
- alloc_pt(l2tab, vl2tab);
+ alloc_pt(l2tab, vl2tab, pl2tab);
vl2e = &vl2tab[l2_table_offset(dsi_v_start)];
ctxt->ctrlreg[3] = l2tab;
for ( count = 0; count < ((v_end - dsi_v_start) >> PAGE_SHIFT); count++ )
- {
+ {
if ( ((unsigned long)vl1e & (PAGE_SIZE-1)) == 0 )
{
- alloc_pt(l1tab, vl1tab);
+ alloc_pt(l1tab, vl1tab, pl1tab);
vl1e = &vl1tab[l1_table_offset(dsi_v_start + (count<<PAGE_SHIFT))];
- *vl2e++ = l1tab | L2_PROT;
- }
-
- *vl1e = (page_array[count] << PAGE_SHIFT) | L1_PROT;
- if ( (count >= ((vpt_start-dsi_v_start)>>PAGE_SHIFT)) &&
- (count < ((vpt_end -dsi_v_start)>>PAGE_SHIFT)) )
- *vl1e &= ~_PAGE_RW;
+ if (shadow_mode_enabled)
+ *vl2e = pl1tab | L2_PROT;
+ else
+ *vl2e = l1tab | L2_PROT;
+ vl2e++;
+ }
+
+ if (shadow_mode_enabled) {
+ *vl1e = (count << PAGE_SHIFT) | L1_PROT;
+ } else {
+ *vl1e = (page_array[count] << PAGE_SHIFT) | L1_PROT;
+ if ( (count >= ((vpt_start-dsi_v_start)>>PAGE_SHIFT)) &&
+ (count < ((vpt_end -dsi_v_start)>>PAGE_SHIFT)) )
+ *vl1e &= ~_PAGE_RW;
+ }
vl1e++;
}
munmap(vl1tab, PAGE_SIZE);
@@ -127,12 +138,13 @@
unsigned long v_end,
unsigned long *page_array,
unsigned long vpt_start,
- unsigned long vpt_end)
+ unsigned long vpt_end,
+ unsigned shadow_mode_enabled)
{
l1_pgentry_64_t *vl1tab = NULL, *vl1e = NULL;
l2_pgentry_64_t *vl2tab = NULL, *vl2e = NULL;
l3_pgentry_64_t *vl3tab = NULL, *vl3e = NULL;
- uint64_t l1tab, l2tab, l3tab;
+ uint64_t l1tab, l2tab, l3tab, pl1tab, pl2tab, pl3tab;
unsigned long ppt_alloc, count, nmfn;
/* First allocate page for page dir. */
@@ -149,7 +161,7 @@
page_array[ppt_alloc] = nmfn;
}
- alloc_pt(l3tab, vl3tab);
+ alloc_pt(l3tab, vl3tab, pl3tab);
vl3e = &vl3tab[l3_table_offset_pae(dsi_v_start)];
ctxt->ctrlreg[3] = l3tab;
@@ -159,22 +171,32 @@
{
if ( !((unsigned long)vl2e & (PAGE_SIZE-1)) )
{
- alloc_pt(l2tab, vl2tab);
+ alloc_pt(l2tab, vl2tab, pl2tab);
vl2e = &vl2tab[l2_table_offset_pae(
dsi_v_start + (count << PAGE_SHIFT))];
- *vl3e++ = l2tab | L3_PROT;
+ if (shadow_mode_enabled)
+ *vl3e = pl2tab | L3_PROT;
+ else
+ *vl3e++ = l2tab | L3_PROT;
}
- alloc_pt(l1tab, vl1tab);
+ alloc_pt(l1tab, vl1tab, pl1tab);
vl1e = &vl1tab[l1_table_offset_pae(
dsi_v_start + (count << PAGE_SHIFT))];
- *vl2e++ = l1tab | L2_PROT;
+ if (shadow_mode_enabled)
+ *vl2e = pl1tab | L2_PROT;
+ else
+ *vl2e++ = l1tab | L2_PROT;
}
- *vl1e = ((uint64_t)page_array[count] << PAGE_SHIFT) | L1_PROT;
- if ( (count >= ((vpt_start-dsi_v_start)>>PAGE_SHIFT)) &&
- (count < ((vpt_end -dsi_v_start)>>PAGE_SHIFT)) )
- *vl1e &= ~_PAGE_RW;
+ if (shadow_mode_enabled) {
+ *vl1e = (count << PAGE_SHIFT) | L1_PROT;
+ } else {
+ *vl1e = ((uint64_t)page_array[count] << PAGE_SHIFT) | L1_PROT;
+ if ( (count >= ((vpt_start-dsi_v_start)>>PAGE_SHIFT)) &&
+ (count < ((vpt_end -dsi_v_start)>>PAGE_SHIFT)) )
+ *vl1e &= ~_PAGE_RW;
+ }
vl1e++;
}
@@ -203,7 +225,8 @@
unsigned long v_end,
unsigned long *page_array,
unsigned long vpt_start,
- unsigned long vpt_end)
+ unsigned long vpt_end,
+ int shadow_mode_enabled)
{
l1_pgentry_t *vl1tab=NULL, *vl1e=NULL;
l2_pgentry_t *vl2tab=NULL, *vl2e=NULL;
@@ -247,11 +270,15 @@
vl2e++;
}
- *vl1e = (page_array[count] << PAGE_SHIFT) | L1_PROT;
- if ( (count >= ((vpt_start-dsi_v_start)>>PAGE_SHIFT)) &&
- (count < ((vpt_end -dsi_v_start)>>PAGE_SHIFT)) )
- {
- *vl1e &= ~_PAGE_RW;
+ if (shadow_mode_enable) {
+ *vl1e = (count << PAGE_SHIFT) | L1_PROT;
+ } else {
+ *vl1e = (page_array[count] << PAGE_SHIFT) | L1_PROT;
+ if ( (count >= ((vpt_start-dsi_v_start)>>PAGE_SHIFT)) &&
+ (count < ((vpt_end -dsi_v_start)>>PAGE_SHIFT)) )
+ {
+ *vl1e &= ~_PAGE_RW;
+ }
}
vl1e++;
}
@@ -458,6 +485,8 @@
unsigned long vpt_start;
unsigned long vpt_end;
unsigned long v_end;
+ unsigned shadow_mode_enabled;
+ unsigned long guest_store_mfn, guest_console_mfn, guest_shared_info_mfn;
rc = probeimageformat(image, image_size, &load_funcs);
if ( rc != 0 )
@@ -558,7 +587,7 @@
goto error_out;
}
- if ( (page_array = malloc(nr_pages * sizeof(unsigned long))) == NULL )
+ if ( (page_array = malloc((nr_pages + 1) * sizeof(unsigned long))) == NULL
)
{
PERROR("Could not allocate memory");
goto error_out;
@@ -593,24 +622,8 @@
if ( (mmu = xc_init_mmu_updates(xc_handle, dom)) == NULL )
goto error_out;
- /* setup page tables */
-#if defined(__i386__)
- if (dsi.pae_kernel)
- rc = setup_pg_tables_pae(xc_handle, dom, ctxt,
- dsi.v_start, v_end,
- page_array, vpt_start, vpt_end);
- else
- rc = setup_pg_tables(xc_handle, dom, ctxt,
- dsi.v_start, v_end,
- page_array, vpt_start, vpt_end);
-#endif
-#if defined(__x86_64__)
- rc = setup_pg_tables_64(xc_handle, dom, ctxt,
- dsi.v_start, v_end,
- page_array, vpt_start, vpt_end);
-#endif
- if (0 != rc)
- goto error_out;
+ shadow_mode_enabled = !!strstr(dsi.xen_guest_string,
+ "SHADOW=translate");
/* Write the phys->machine and machine->phys table entries. */
physmap_pfn = (vphysmap_start - dsi.v_start) >> PAGE_SHIFT;
@@ -618,7 +631,10 @@
xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE,
page_array[physmap_pfn++]);
- for ( count = 0; count < nr_pages; count++ )
+ if (shadow_mode_enabled)
+ page_array[nr_pages] = shared_info_frame;
+
+ for ( count = 0; count < nr_pages + shadow_mode_enabled; count++ )
{
if ( xc_add_mmu_update(
xc_handle, mmu,
@@ -640,20 +656,58 @@
}
}
munmap(physmap, PAGE_SIZE);
-
+
+ /* Send the page update requests down to the hypervisor. */
+ if ( xc_finish_mmu_updates(xc_handle, mmu) )
+ goto error_out;
+
+ if (shadow_mode_enabled) {
+ /* Enable shadow translate mode */
+ if (xc_shadow_control(xc_handle, dom,
+ DOM0_SHADOW_CONTROL_OP_ENABLE_TRANSLATE,
+ NULL, 0, NULL) < 0) {
+ PERROR("Could not enable translation mode");
+ goto error_out;
+ }
+ }
+
+ /* setup page tables */
+#if defined(__i386__)
+ if (dsi.pae_kernel)
+ rc = setup_pg_tables_pae(xc_handle, dom, ctxt,
+ dsi.v_start, v_end,
+ page_array, vpt_start, vpt_end,
+ shadow_mode_enabled);
+ else
+ rc = setup_pg_tables(xc_handle, dom, ctxt,
+ dsi.v_start, v_end,
+ page_array, vpt_start, vpt_end,
+ shadow_mode_enabled);
+#endif
+#if defined(__x86_64__)
+ rc = setup_pg_tables_64(xc_handle, dom, ctxt,
+ dsi.v_start, v_end,
+ page_array, vpt_start, vpt_end,
+ shadow_mode_enabled);
+#endif
+ if (0 != rc)
+ goto error_out;
+
#if defined(__i386__)
/*
* Pin down l2tab addr as page dir page - causes hypervisor to provide
* correct protection for the page
*/
- if (dsi.pae_kernel) {
- if ( pin_table(xc_handle, MMUEXT_PIN_L3_TABLE,
- ctxt->ctrlreg[3] >> PAGE_SHIFT, dom) )
- goto error_out;
- } else {
- if ( pin_table(xc_handle, MMUEXT_PIN_L2_TABLE,
- ctxt->ctrlreg[3] >> PAGE_SHIFT, dom) )
- goto error_out;
+ if (!shadow_mode_enabled) {
+ if (dsi.pae_kernel) {
+ if ( pin_table(xc_handle, MMUEXT_PIN_L3_TABLE,
+ ctxt->ctrlreg[3] >> PAGE_SHIFT, dom) )
+ goto error_out;
+ } else {
+ if ( pin_table(xc_handle, MMUEXT_PIN_L2_TABLE,
+ ctxt->ctrlreg[3] >> PAGE_SHIFT, dom) )
+ goto error_out;
+ }
}
#endif
@@ -672,24 +726,34 @@
if ( xc_clear_domain_page(xc_handle, dom, *store_mfn) ||
xc_clear_domain_page(xc_handle, dom, *console_mfn) )
goto error_out;
+ if (shadow_mode_enabled) {
+ guest_store_mfn = (vstoreinfo_start-dsi.v_start) >> PAGE_SHIFT;
+ guest_console_mfn = (vconsole_start-dsi.v_start) >> PAGE_SHIFT;
+ guest_shared_info_mfn = nr_pages;
+ } else {
+ guest_store_mfn = *store_mfn;
+ guest_console_mfn = *console_mfn;
+ guest_shared_info_mfn = shared_info_frame;
+ }
start_info = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE,
page_array[(vstartinfo_start-dsi.v_start)>>PAGE_SHIFT]);
+ /*shared_info, start_info */
memset(start_info, 0, sizeof(*start_info));
rc = xc_version(xc_handle, XENVER_version, NULL);
sprintf(start_info->magic, "xen-%i.%i-x86_%d%s",
rc >> 16, rc & (0xFFFF), (unsigned int)sizeof(long)*8,
dsi.pae_kernel ? "p" : "");
start_info->nr_pages = nr_pages;
- start_info->shared_info = shared_info_frame << PAGE_SHIFT;
+ start_info->shared_info = guest_shared_info_mfn << PAGE_SHIFT;
start_info->flags = flags;
start_info->pt_base = vpt_start;
start_info->nr_pt_frames = nr_pt_pages;
start_info->mfn_list = vphysmap_start;
- start_info->store_mfn = *store_mfn;
+ start_info->store_mfn = guest_store_mfn;
start_info->store_evtchn = store_evtchn;
- start_info->console_mfn = *console_mfn;
+ start_info->console_mfn = guest_console_mfn;
start_info->console_evtchn = console_evtchn;
if ( initrd_len != 0 )
{
diff -r 860fa26845c2 -r 43c294aea9ec xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Wed Jan 25 16:14:19 2006
+++ b/xen/arch/x86/mm.c Wed Jan 25 16:15:11 2006
@@ -1826,6 +1826,8 @@
break;
case MMUEXT_NEW_BASEPTR:
+ if (shadow_mode_translate(current->domain))
+ mfn = __gpfn_to_mfn(current->domain, mfn);
okay = new_guest_cr3(mfn);
percpu_info[cpu].deferred_ops &= ~DOP_FLUSH_TLB;
break;
@@ -2680,6 +2682,7 @@
int nr_pages = (entries + 511) / 512;
unsigned long frames[16];
long ret;
+ int x;
/* Rechecked in set_gdt, but ensures a sane limit for copy_from_user(). */
if ( entries > FIRST_RESERVED_GDT_ENTRY )
@@ -2687,6 +2690,11 @@
if ( copy_from_user(frames, frame_list, nr_pages * sizeof(unsigned long)) )
return -EFAULT;
+
+ if (shadow_mode_translate(current->domain)) {
+ for (x = 0; x < nr_pages; x++)
+ frames[x] = __gpfn_to_mfn(current->domain, frames[x]);
+ }
LOCK_BIGLOCK(current->domain);
diff -r 860fa26845c2 -r 43c294aea9ec xen/arch/x86/shadow32.c
--- a/xen/arch/x86/shadow32.c Wed Jan 25 16:14:19 2006
+++ b/xen/arch/x86/shadow32.c Wed Jan 25 16:15:11 2006
@@ -1391,7 +1391,7 @@
case DOM0_SHADOW_CONTROL_OP_ENABLE_TRANSLATE:
free_shadow_pages(d);
rc = __shadow_mode_enable(
- d, d->arch.shadow_mode|SHM_enable|SHM_refcounts|SHM_translate);
+ d,
d->arch.shadow_mode|SHM_enable|SHM_refcounts|SHM_translate|SHM_wr_pt_pte);
break;
default:
@@ -2643,7 +2643,8 @@
__guest_get_l2e(v, va, &gpde);
if ( unlikely(!(l2e_get_flags(gpde) & _PAGE_PRESENT)) )
{
- SH_VVLOG("shadow_fault - EXIT: L1 not present");
+ SH_VVLOG("shadow_fault - EXIT: L2 not present (%x)",
+ l2e_get_intpte(gpde));
perfc_incrc(shadow_fault_bail_pde_not_present);
goto fail;
}
@@ -2655,8 +2656,9 @@
orig_gpte = gpte = linear_pg_table[l1_linear_offset(va)];
if ( unlikely(!(l1e_get_flags(gpte) & _PAGE_PRESENT)) )
{
- SH_VVLOG("shadow_fault - EXIT: gpte not present (%" PRIpte ")",
- l1e_get_intpte(gpte));
+ SH_VVLOG("shadow_fault - EXIT: gpte not present (%" PRIpte ") (gpde %"
PRIpte ")",
+ l1e_get_intpte(gpte),
+ l2e_get_intpte(gpde));
perfc_incrc(shadow_fault_bail_pte_not_present);
goto fail;
}
diff -r 860fa26845c2 -r 43c294aea9ec xen/include/asm-x86/shadow.h
--- a/xen/include/asm-x86/shadow.h Wed Jan 25 16:14:19 2006
+++ b/xen/include/asm-x86/shadow.h Wed Jan 25 16:15:11 2006
@@ -490,7 +490,7 @@
#ifndef NDEBUG
else if ( mfn < max_page )
{
- SH_VLOG("mark_dirty OOR! mfn=%x pfn=%lx max=%x (dom %p)",
+ SH_VLOG("mark_dirty OOR! mfn=%lx pfn=%lx max=%x (dom %p)",
mfn, pfn, d->arch.shadow_dirty_bitmap_size, d);
SH_VLOG("dom=%p caf=%08x taf=%" PRtype_info,
page_get_owner(pfn_to_page(mfn)),
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