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x86/xen: Remove Xen debugfs support

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The only Xen file in debugfs is for dumping the p2m table when running
as a Xen PV guest. This might have been useful when the PV code was
young, but there haven't been any p2m related bugs requiring the p2m
dump since ages.

Remove the code and the related config option.

Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20260522152114.77319-4-jgross@suse.com>
This commit is contained in:
Juergen Gross 2026-05-22 17:21:14 +02:00
parent c9305cdd5f
commit 8a06aedc09
5 changed files with 0 additions and 72 deletions
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7
arch/x86/xen/Kconfig
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@ -65,13 +65,6 @@ config XEN_PVHVM_GUEST
help
Support running as a Xen PVHVM guest.
config XEN_DEBUG_FS
bool "Enable Xen debug and tuning parameters in debugfs"
depends on XEN && DEBUG_FS
help
Enable statistics output and various tuning options in debugfs.
Enabling this option may incur a significant performance overhead.
config XEN_PVH
bool "Xen PVH guest support"
depends on XEN && XEN_PVHVM && ACPI

2
arch/x86/xen/Makefile
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@ -43,8 +43,6 @@ obj-$(CONFIG_XEN_PVHVM_SMP) += smp_hvm.o
obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
obj-$(CONFIG_XEN_DOM0) += vga.o
obj-$(CONFIG_XEN_EFI) += efi.o

16
arch/x86/xen/debugfs.c
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@ -1,16 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include "xen-ops.h"
static struct dentry *d_xen_debug;
struct dentry * __init xen_init_debugfs(void)
{
if (!d_xen_debug)
d_xen_debug = debugfs_create_dir("xen", NULL);
return d_xen_debug;
}

45
arch/x86/xen/p2m.c
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@ -883,48 +883,3 @@ void __init xen_add_remap_nonram(phys_addr_t maddr, phys_addr_t paddr,
nr_nonram_remap++;
}
#ifdef CONFIG_XEN_DEBUG_FS
#include <linux/debugfs.h>
static int p2m_dump_show(struct seq_file *m, void *v)
{
static const char * const type_name[] = {
[P2M_TYPE_IDENTITY] = "identity",
[P2M_TYPE_MISSING] = "missing",
[P2M_TYPE_PFN] = "pfn",
[P2M_TYPE_UNKNOWN] = "abnormal"};
unsigned long pfn, first_pfn;
int type, prev_type;
prev_type = xen_p2m_elem_type(0);
first_pfn = 0;
for (pfn = 0; pfn < xen_p2m_size; pfn++) {
type = xen_p2m_elem_type(pfn);
if (type != prev_type) {
seq_printf(m, " [0x%lx->0x%lx] %s\n", first_pfn, pfn,
type_name[prev_type]);
prev_type = type;
first_pfn = pfn;
}
}
seq_printf(m, " [0x%lx->0x%lx] %s\n", first_pfn, pfn,
type_name[prev_type]);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(p2m_dump);
static struct dentry *d_mmu_debug;
static int __init xen_p2m_debugfs(void)
{
struct dentry *d_xen = xen_init_debugfs();
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 */

2
arch/x86/xen/xen-ops.h
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@ -254,8 +254,6 @@ static inline void xen_hvm_post_suspend(int suspend_cancelled) {}
void xen_add_extra_mem(unsigned long start_pfn, unsigned long n_pfns);
struct dentry * __init xen_init_debugfs(void);
bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
void xen_hvm_init_mmu_ops(void);