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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] x86: don't maintain compat M2P when !PV32
commit 13795767298d5fffcb636069877785c8e344ac07
Author: Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Aug 25 17:46:27 2020 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Aug 25 17:46:27 2020 +0200
x86: don't maintain compat M2P when !PV32
It's effectively unused in this case (as well as when "pv=no-32").
While touching their definitions anyway, also adjust section placement
of m2p_compat_vstart and compat_idle_pg_table_l2. Similarly, while
putting init_xen_pae_l2_slots() inside #ifdef, also move it to a PV-only
source file.
Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
xen/arch/x86/domain.c | 2 +
xen/arch/x86/mm.c | 7 ----
xen/arch/x86/pv/mm.c | 9 ++++
xen/arch/x86/x86_64/compat/mm.c | 6 +++
xen/arch/x86/x86_64/mm.c | 91 ++++++++++++++++++++++++++---------------
xen/include/asm-x86/config.h | 11 ++++-
xen/include/asm-x86/domain.h | 2 +
xen/include/asm-x86/mm.h | 4 ++
8 files changed, 92 insertions(+), 40 deletions(-)
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 00ef05b4af..66975d5f2c 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -764,8 +764,10 @@ int arch_domain_create(struct domain *d,
}
d->arch.emulation_flags = emflags;
+#ifdef CONFIG_PV32
HYPERVISOR_COMPAT_VIRT_START(d) =
is_pv_domain(d) ? __HYPERVISOR_COMPAT_VIRT_START : ~0u;
+#endif
if ( (rc = paging_domain_init(d)) != 0 )
goto fail;
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 638f6bf580..35ec0e11f6 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -1427,13 +1427,6 @@ static bool pae_xen_mappings_check(const struct domain
*d,
return true;
}
-void init_xen_pae_l2_slots(l2_pgentry_t *l2t, const struct domain *d)
-{
- memcpy(&l2t[COMPAT_L2_PAGETABLE_FIRST_XEN_SLOT(d)],
- compat_idle_pg_table_l2,
- COMPAT_L2_PAGETABLE_XEN_SLOTS(d) * sizeof(*l2t));
-}
-
static int promote_l2_table(struct page_info *page, unsigned long type)
{
struct domain *d = page_get_owner(page);
diff --git a/xen/arch/x86/pv/mm.c b/xen/arch/x86/pv/mm.c
index 5d4cd00941..14cb0f2d4e 100644
--- a/xen/arch/x86/pv/mm.c
+++ b/xen/arch/x86/pv/mm.c
@@ -128,6 +128,15 @@ bool pv_map_ldt_shadow_page(unsigned int offset)
return true;
}
+#ifdef CONFIG_PV32
+void init_xen_pae_l2_slots(l2_pgentry_t *l2t, const struct domain *d)
+{
+ memcpy(&l2t[COMPAT_L2_PAGETABLE_FIRST_XEN_SLOT(d)],
+ compat_idle_pg_table_l2,
+ COMPAT_L2_PAGETABLE_XEN_SLOTS(d) * sizeof(*l2t));
+}
+#endif
+
/*
* Local variables:
* mode: C
diff --git a/xen/arch/x86/x86_64/compat/mm.c b/xen/arch/x86/x86_64/compat/mm.c
index d4c6be3032..febdaa1977 100644
--- a/xen/arch/x86/x86_64/compat/mm.c
+++ b/xen/arch/x86/x86_64/compat/mm.c
@@ -103,6 +103,9 @@ int compat_arch_memory_op(unsigned long cmd,
XEN_GUEST_HANDLE_PARAM(void) arg)
.max_mfn = MACH2PHYS_COMPAT_NR_ENTRIES(d) - 1
};
+ if ( !opt_pv32 )
+ return -EOPNOTSUPP;
+
if ( copy_to_guest(arg, &mapping, 1) )
rc = -EFAULT;
@@ -115,6 +118,9 @@ int compat_arch_memory_op(unsigned long cmd,
XEN_GUEST_HANDLE_PARAM(void) arg)
unsigned long limit;
compat_pfn_t last_mfn;
+ if ( !opt_pv32 )
+ return -EOPNOTSUPP;
+
if ( copy_from_guest(&xmml, arg, 1) )
return -EFAULT;
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index 227eba911e..29048d34dc 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -34,17 +34,30 @@ EMIT_FILE;
#include <asm/fixmap.h>
#include <asm/hypercall.h>
#include <asm/msr.h>
+#include <asm/pv/domain.h>
#include <asm/setup.h>
#include <asm/numa.h>
#include <asm/mem_paging.h>
#include <asm/mem_sharing.h>
#include <public/memory.h>
+#ifdef CONFIG_PV32
+
#define compat_machine_to_phys_mapping ((unsigned int
*)RDWR_COMPAT_MPT_VIRT_START)
-unsigned int __read_mostly m2p_compat_vstart = __HYPERVISOR_COMPAT_VIRT_START;
+unsigned int __initdata m2p_compat_vstart = __HYPERVISOR_COMPAT_VIRT_START;
+
+l2_pgentry_t *__read_mostly compat_idle_pg_table_l2;
+
+#else /* !CONFIG_PV32 */
+
+/*
+ * Declare the symbol such that (dead) code referencing it can be built
+ * without a lot of #ifdef-ary (relying on DCE by the compiler).
+ */
+extern unsigned int compat_machine_to_phys_mapping[];
-l2_pgentry_t *compat_idle_pg_table_l2;
+#endif /* CONFIG_PV32 */
void *do_page_walk(struct vcpu *v, unsigned long addr)
{
@@ -220,7 +233,8 @@ static void destroy_compat_m2p_mapping(struct
mem_hotadd_info *info)
{
unsigned long i, smap = info->spfn, emap = info->spfn;
- if ( smap > ((RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) >> 2)
)
+ if ( !opt_pv32 ||
+ smap > ((RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) >> 2)
)
return;
if ( emap > ((RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) >> 2)
)
@@ -328,7 +342,8 @@ static int setup_compat_m2p_table(struct mem_hotadd_info
*info)
* Notice: For hot-added memory, only range below m2p_compat_vstart
* will be filled up (assuming memory is discontinous when booting).
*/
- if ((smap > ((RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) >>
2)) )
+ if ( !opt_pv32 ||
+ (smap > ((RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) >>
2)) )
return 0;
if ( epfn > ((RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) >> 2)
)
@@ -611,17 +626,24 @@ void __init paging_init(void)
#undef MFN
/* Create user-accessible L2 directory to map the MPT for compat guests. */
- if ( (l2_ro_mpt = alloc_xen_pagetable()) == NULL )
- goto nomem;
- compat_idle_pg_table_l2 = l2_ro_mpt;
- clear_page(l2_ro_mpt);
- /* Allocate and map the compatibility mode machine-to-phys table. */
- mpt_size = (mpt_size >> 1) + (1UL << (L2_PAGETABLE_SHIFT - 1));
- if ( mpt_size > RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START )
- mpt_size = RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START;
- mpt_size &= ~((1UL << L2_PAGETABLE_SHIFT) - 1UL);
- if ( (m2p_compat_vstart + mpt_size) < MACH2PHYS_COMPAT_VIRT_END )
- m2p_compat_vstart = MACH2PHYS_COMPAT_VIRT_END - mpt_size;
+ if ( opt_pv32 )
+ {
+ if ( (l2_ro_mpt = alloc_xen_pagetable()) == NULL )
+ goto nomem;
+ compat_idle_pg_table_l2 = l2_ro_mpt;
+ clear_page(l2_ro_mpt);
+
+ /* Allocate and map the compatibility mode machine-to-phys table. */
+ mpt_size = (mpt_size >> 1) + (1UL << (L2_PAGETABLE_SHIFT - 1));
+ if ( mpt_size > RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START )
+ mpt_size = RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START;
+ mpt_size &= ~((1UL << L2_PAGETABLE_SHIFT) - 1UL);
+ if ( (m2p_compat_vstart + mpt_size) < MACH2PHYS_COMPAT_VIRT_END )
+ m2p_compat_vstart = MACH2PHYS_COMPAT_VIRT_END - mpt_size;
+ }
+ else
+ mpt_size = 0;
+
#define MFN(x) (((x) << L2_PAGETABLE_SHIFT) / sizeof(unsigned int))
#define CNT ((sizeof(*frame_table) & -sizeof(*frame_table)) / \
sizeof(*compat_machine_to_phys_mapping))
@@ -847,23 +869,24 @@ void __init subarch_init_memory(void)
mfn_to_page(_mfn(m2p_start_mfn + i)), SHARE_ro);
}
- for ( v = RDWR_COMPAT_MPT_VIRT_START;
- v != RDWR_COMPAT_MPT_VIRT_END;
- v += 1 << L2_PAGETABLE_SHIFT )
- {
- l3e = l3e_from_l4e(idle_pg_table[l4_table_offset(v)],
- l3_table_offset(v));
- if ( !(l3e_get_flags(l3e) & _PAGE_PRESENT) )
- continue;
- l2e = l2e_from_l3e(l3e, l2_table_offset(v));
- if ( !(l2e_get_flags(l2e) & _PAGE_PRESENT) )
- continue;
- m2p_start_mfn = l2e_get_pfn(l2e);
+ if ( opt_pv32 )
+ for ( v = RDWR_COMPAT_MPT_VIRT_START;
+ v != RDWR_COMPAT_MPT_VIRT_END;
+ v += 1 << L2_PAGETABLE_SHIFT )
+ {
+ l3e = l3e_from_l4e(idle_pg_table[l4_table_offset(v)],
+ l3_table_offset(v));
+ if ( !(l3e_get_flags(l3e) & _PAGE_PRESENT) )
+ continue;
+ l2e = l2e_from_l3e(l3e, l2_table_offset(v));
+ if ( !(l2e_get_flags(l2e) & _PAGE_PRESENT) )
+ continue;
+ m2p_start_mfn = l2e_get_pfn(l2e);
- for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
- share_xen_page_with_privileged_guests(
- mfn_to_page(_mfn(m2p_start_mfn + i)), SHARE_ro);
- }
+ for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
+ share_xen_page_with_privileged_guests(
+ mfn_to_page(_mfn(m2p_start_mfn + i)), SHARE_ro);
+ }
/* Mark all of direct map NX if hardware supports it. */
if ( !cpu_has_nx )
@@ -935,6 +958,9 @@ long subarch_memory_op(unsigned long cmd,
XEN_GUEST_HANDLE_PARAM(void) arg)
break;
case XENMEM_machphys_compat_mfn_list:
+ if ( !opt_pv32 )
+ return -EOPNOTSUPP;
+
if ( copy_from_guest(&xmml, arg, 1) )
return -EFAULT;
@@ -1464,7 +1490,8 @@ void set_gpfn_from_mfn(unsigned long mfn, unsigned long
pfn)
if ( unlikely(!machine_to_phys_mapping_valid) )
return;
- if ( mfn < (RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) / 4 )
+ if ( opt_pv32 &&
+ mfn < (RDWR_COMPAT_MPT_VIRT_END - RDWR_COMPAT_MPT_VIRT_START) / 4 )
compat_machine_to_phys_mapping[mfn] = entry;
machine_to_phys_mapping[mfn] = entry;
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h
index 665e9cc31d..eb25fc4758 100644
--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -142,7 +142,7 @@ extern unsigned char boot_edid_info[128];
* 0xffff82c000000000 - 0xffff82cfffffffff [64GB, 2^36 bytes, PML4:261]
* vmap()/ioremap()/fixmap area.
* 0xffff82d000000000 - 0xffff82d03fffffff [1GB, 2^30 bytes, PML4:261]
- * Compatibility machine-to-phys translation table.
+ * Compatibility machine-to-phys translation table (CONFIG_PV32).
* 0xffff82d040000000 - 0xffff82d07fffffff [1GB, 2^30 bytes, PML4:261]
* Xen text, static data, bss.
#ifndef CONFIG_BIGMEM
@@ -246,9 +246,18 @@ extern unsigned char boot_edid_info[128];
#ifndef __ASSEMBLY__
+#ifdef CONFIG_PV32
+
/* This is not a fixed value, just a lower limit. */
#define __HYPERVISOR_COMPAT_VIRT_START 0xF5800000
#define HYPERVISOR_COMPAT_VIRT_START(d) ((d)->arch.hv_compat_vstart)
+
+#else /* !CONFIG_PV32 */
+
+#define HYPERVISOR_COMPAT_VIRT_START(d) ((void)(d), 0)
+
+#endif /* CONFIG_PV32 */
+
#define MACH2PHYS_COMPAT_VIRT_START HYPERVISOR_COMPAT_VIRT_START
#define MACH2PHYS_COMPAT_VIRT_END 0xFFE00000
#define MACH2PHYS_COMPAT_NR_ENTRIES(d) \
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 635335634d..5fb347a94c 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -307,7 +307,9 @@ struct arch_domain
{
struct page_info *perdomain_l3_pg;
+#ifdef CONFIG_PV32
unsigned int hv_compat_vstart;
+#endif
/* Maximum physical-address bitwidth supported by this guest. */
unsigned int physaddr_bitsize;
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index 89a55592c4..632ece1cee 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -42,8 +42,12 @@
#define _PGT_validated PG_shift(6)
#define PGT_validated PG_mask(1, 6)
/* PAE only: is this an L2 page directory containing Xen-private mappings? */
+#ifdef CONFIG_PV32
#define _PGT_pae_xen_l2 PG_shift(7)
#define PGT_pae_xen_l2 PG_mask(1, 7)
+#else
+#define PGT_pae_xen_l2 0
+#endif
/* Has this page been *partially* validated for use as its current type? */
#define _PGT_partial PG_shift(8)
#define PGT_partial PG_mask(1, 8)
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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