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-rw-r--r--arch/x86/xen/Kconfig8
-rw-r--r--arch/x86/xen/enlighten.c1
-rw-r--r--arch/x86/xen/mmu.c52
-rw-r--r--arch/x86/xen/p2m.c128
4 files changed, 110 insertions, 79 deletions
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 5cc821cb2e09..ae559fe91c25 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -49,11 +49,3 @@ config XEN_DEBUG_FS
help
Enable statistics output and various tuning options in debugfs.
Enabling this option may incur a significant performance overhead.
-
-config XEN_DEBUG
- bool "Enable Xen debug checks"
- depends on XEN
- default n
- help
- Enable various WARN_ON checks in the Xen MMU code.
- Enabling this option WILL incur a significant performance overhead.
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 2d69617950f7..da8afd576a6b 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -251,6 +251,7 @@ static void __init xen_init_cpuid_mask(void)
~((1 << X86_FEATURE_APIC) | /* disable local APIC */
(1 << X86_FEATURE_ACPI)); /* disable ACPI */
ax = 1;
+ cx = 0;
xen_cpuid(&ax, &bx, &cx, &dx);
xsave_mask =
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 3dd53f997b11..87f6673b1207 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -495,41 +495,6 @@ static pte_t xen_make_pte(pteval_t pte)
}
PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
-#ifdef CONFIG_XEN_DEBUG
-pte_t xen_make_pte_debug(pteval_t pte)
-{
- phys_addr_t addr = (pte & PTE_PFN_MASK);
- phys_addr_t other_addr;
- bool io_page = false;
- pte_t _pte;
-
- if (pte & _PAGE_IOMAP)
- io_page = true;
-
- _pte = xen_make_pte(pte);
-
- if (!addr)
- return _pte;
-
- if (io_page &&
- (xen_initial_domain() || addr >= ISA_END_ADDRESS)) {
- other_addr = pfn_to_mfn(addr >> PAGE_SHIFT) << PAGE_SHIFT;
- WARN_ONCE(addr != other_addr,
- "0x%lx is using VM_IO, but it is 0x%lx!\n",
- (unsigned long)addr, (unsigned long)other_addr);
- } else {
- pteval_t iomap_set = (_pte.pte & PTE_FLAGS_MASK) & _PAGE_IOMAP;
- other_addr = (_pte.pte & PTE_PFN_MASK);
- WARN_ONCE((addr == other_addr) && (!io_page) && (!iomap_set),
- "0x%lx is missing VM_IO (and wasn't fixed)!\n",
- (unsigned long)addr);
- }
-
- return _pte;
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte_debug);
-#endif
-
static pgd_t xen_make_pgd(pgdval_t pgd)
{
pgd = pte_pfn_to_mfn(pgd);
@@ -1992,9 +1957,6 @@ void __init xen_ident_map_ISA(void)
static void __init xen_post_allocator_init(void)
{
-#ifdef CONFIG_XEN_DEBUG
- pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte_debug);
-#endif
pv_mmu_ops.set_pte = xen_set_pte;
pv_mmu_ops.set_pmd = xen_set_pmd;
pv_mmu_ops.set_pud = xen_set_pud;
@@ -2404,17 +2366,3 @@ out:
return err;
}
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
-
-#ifdef CONFIG_XEN_DEBUG_FS
-static int p2m_dump_open(struct inode *inode, struct file *filp)
-{
- return single_open(filp, p2m_dump_show, NULL);
-}
-
-static const struct file_operations p2m_dump_fops = {
- .open = p2m_dump_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-#endif /* CONFIG_XEN_DEBUG_FS */
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 58efeb9d5440..1b267e75158d 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -161,7 +161,9 @@
#include <asm/xen/page.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
+#include <xen/grant_table.h>
+#include "multicalls.h"
#include "xen-ops.h"
static void __init m2p_override_init(void);
@@ -676,7 +678,8 @@ static unsigned long mfn_hash(unsigned long mfn)
}
/* Add an MFN override for a particular page */
-int m2p_add_override(unsigned long mfn, struct page *page, bool clear_pte)
+int m2p_add_override(unsigned long mfn, struct page *page,
+ struct gnttab_map_grant_ref *kmap_op)
{
unsigned long flags;
unsigned long pfn;
@@ -692,16 +695,28 @@ int m2p_add_override(unsigned long mfn, struct page *page, bool clear_pte)
"m2p_add_override: pfn %lx not mapped", pfn))
return -EINVAL;
}
-
- page->private = mfn;
+ WARN_ON(PagePrivate(page));
+ SetPagePrivate(page);
+ set_page_private(page, mfn);
page->index = pfn_to_mfn(pfn);
if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn))))
return -ENOMEM;
- if (clear_pte && !PageHighMem(page))
- /* Just zap old mapping for now */
- pte_clear(&init_mm, address, ptep);
+ if (kmap_op != NULL) {
+ if (!PageHighMem(page)) {
+ struct multicall_space mcs =
+ xen_mc_entry(sizeof(*kmap_op));
+
+ MULTI_grant_table_op(mcs.mc,
+ GNTTABOP_map_grant_ref, kmap_op, 1);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+ }
+ /* let's use dev_bus_addr to record the old mfn instead */
+ kmap_op->dev_bus_addr = page->index;
+ page->index = (unsigned long) kmap_op;
+ }
spin_lock_irqsave(&m2p_override_lock, flags);
list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]);
spin_unlock_irqrestore(&m2p_override_lock, flags);
@@ -735,13 +750,56 @@ int m2p_remove_override(struct page *page, bool clear_pte)
spin_lock_irqsave(&m2p_override_lock, flags);
list_del(&page->lru);
spin_unlock_irqrestore(&m2p_override_lock, flags);
- set_phys_to_machine(pfn, page->index);
+ WARN_ON(!PagePrivate(page));
+ ClearPagePrivate(page);
- if (clear_pte && !PageHighMem(page))
- set_pte_at(&init_mm, address, ptep,
- pfn_pte(pfn, PAGE_KERNEL));
- /* No tlb flush necessary because the caller already
- * left the pte unmapped. */
+ if (clear_pte) {
+ struct gnttab_map_grant_ref *map_op =
+ (struct gnttab_map_grant_ref *) page->index;
+ set_phys_to_machine(pfn, map_op->dev_bus_addr);
+ if (!PageHighMem(page)) {
+ struct multicall_space mcs;
+ struct gnttab_unmap_grant_ref *unmap_op;
+
+ /*
+ * It might be that we queued all the m2p grant table
+ * hypercalls in a multicall, then m2p_remove_override
+ * get called before the multicall has actually been
+ * issued. In this case handle is going to -1 because
+ * it hasn't been modified yet.
+ */
+ if (map_op->handle == -1)
+ xen_mc_flush();
+ /*
+ * Now if map_op->handle is negative it means that the
+ * hypercall actually returned an error.
+ */
+ if (map_op->handle == GNTST_general_error) {
+ printk(KERN_WARNING "m2p_remove_override: "
+ "pfn %lx mfn %lx, failed to modify kernel mappings",
+ pfn, mfn);
+ return -1;
+ }
+
+ mcs = xen_mc_entry(
+ sizeof(struct gnttab_unmap_grant_ref));
+ unmap_op = mcs.args;
+ unmap_op->host_addr = map_op->host_addr;
+ unmap_op->handle = map_op->handle;
+ unmap_op->dev_bus_addr = 0;
+
+ MULTI_grant_table_op(mcs.mc,
+ GNTTABOP_unmap_grant_ref, unmap_op, 1);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+
+ set_pte_at(&init_mm, address, ptep,
+ pfn_pte(pfn, PAGE_KERNEL));
+ __flush_tlb_single(address);
+ map_op->host_addr = 0;
+ }
+ } else
+ set_phys_to_machine(pfn, page->index);
return 0;
}
@@ -758,7 +816,7 @@ struct page *m2p_find_override(unsigned long mfn)
spin_lock_irqsave(&m2p_override_lock, flags);
list_for_each_entry(p, bucket, lru) {
- if (p->private == mfn) {
+ if (page_private(p) == mfn) {
ret = p;
break;
}
@@ -782,17 +840,21 @@ unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn)
EXPORT_SYMBOL_GPL(m2p_find_override_pfn);
#ifdef CONFIG_XEN_DEBUG_FS
-
-int p2m_dump_show(struct seq_file *m, void *v)
+#include <linux/debugfs.h>
+#include "debugfs.h"
+static int p2m_dump_show(struct seq_file *m, void *v)
{
static const char * const level_name[] = { "top", "middle",
- "entry", "abnormal" };
- static const char * const type_name[] = { "identity", "missing",
- "pfn", "abnormal"};
+ "entry", "abnormal", "error"};
#define TYPE_IDENTITY 0
#define TYPE_MISSING 1
#define TYPE_PFN 2
#define TYPE_UNKNOWN 3
+ static const char * const type_name[] = {
+ [TYPE_IDENTITY] = "identity",
+ [TYPE_MISSING] = "missing",
+ [TYPE_PFN] = "pfn",
+ [TYPE_UNKNOWN] = "abnormal"};
unsigned long pfn, prev_pfn_type = 0, prev_pfn_level = 0;
unsigned int uninitialized_var(prev_level);
unsigned int uninitialized_var(prev_type);
@@ -856,4 +918,32 @@ int p2m_dump_show(struct seq_file *m, void *v)
#undef TYPE_PFN
#undef TYPE_UNKNOWN
}
-#endif
+
+static int p2m_dump_open(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, p2m_dump_show, NULL);
+}
+
+static const struct file_operations p2m_dump_fops = {
+ .open = p2m_dump_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static struct dentry *d_mmu_debug;
+
+static int __init xen_p2m_debugfs(void)
+{
+ struct dentry *d_xen = xen_init_debugfs();
+
+ if (d_xen == NULL)
+ return -ENOMEM;
+
+ d_mmu_debug = debugfs_create_dir("mmu", d_xen);
+
+ debugfs_create_file("p2m", 0600, d_mmu_debug, NULL, &p2m_dump_fops);
+ return 0;
+}
+fs_initcall(xen_p2m_debugfs);
+#endif /* CONFIG_XEN_DEBUG_FS */
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-05 04:34:07 +0000