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linux/arch/x86/kernel
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Jiri Bohac 7fd817c906 x86/e820: Don't reserve SETUP_RNG_SEED in e820 
SETUP_RNG_SEED in setup_data is supplied by kexec and should
not be reserved in the e820 map.

Doing so reserves 16 bytes of RAM when booting with kexec.
(16 bytes because data->len is zeroed by parse_setup_data so only
sizeof(setup_data) is reserved.)

When kexec is used repeatedly, each boot adds two entries in the
kexec-provided e820 map as the 16-byte range splits a larger
range of usable memory. Eventually all of the 128 available entries
get used up. The next split will result in losing usable memory
as the new entries cannot be added to the e820 map.

Fixes: 68b8e9713c8e ("x86/setup: Use rng seeds from setup_data")
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/ZbmOjKnARGiaYBd5@dwarf.suse.cz
2024-03-01 10:27:20 -08:00
..
acpi
x86/acpi: Handle bogus MADT APIC tables gracefully
2023-12-18 14:21:44 +01:00
apic
x86/cleanups changes for v6.8:
2024-01-08 17:23:32 -08:00
cpu
x86/cpu/intel: Detect TME keyid bits before setting MTRR mask registers
2024-02-26 08:16:16 -08:00
fpu
x86/fpu: Stop relying on userspace for info to fault in xsave buffer
2024-01-30 07:25:48 -08:00
kprobes
x86/kprobes: fix incorrect return address calculation in kprobe_emulate_call_indirect
2024-01-04 14:10:59 +09:00
.gitignore
…
alternative.c
x86/paravirt: Make BUG_func() usable by non-GPL modules
2024-01-22 15:51:07 +01:00
amd_gart_64.c
arch/x86: Fix typos
2024-01-03 11:46:22 +01:00
amd_nb.c
X86 core code updates:
2023-10-30 17:37:47 -10:00
aperture_64.c
x86/pci: Use PCI_HEADER_TYPE_* instead of literals
2023-12-01 15:00:43 -06:00
apm_32.c
x86/asm: Replace magic numbers in GDT descriptors, script-generated change
2023-12-20 10:57:38 +01:00
asm-offsets_32.c
…
asm-offsets_64.c
x86: Fixup asm-offsets duplicate
2022-10-17 16:41:06 +02:00
asm-offsets.c
x86/tdx: Make TDX_HYPERCALL asm similar to TDX_MODULE_CALL
2023-09-12 16:28:13 -07:00
audit_64.c
x86/audit: Fix -Wmissing-variable-declarations warning for ia32_xyz_class
2023-08-30 10:11:16 +02:00
bootflag.c
…
callthunks.c
x86/paravirt: Switch mixed paravirt/alternative calls to alternatives
2023-12-10 23:33:09 +01:00
cet.c
x86/ibt: Convert IBT selftest to asm
2023-08-17 17:07:09 +02:00
cfi.c
cfi: Flip headers
2023-12-15 16:25:55 -08:00
check.c
…
cpuid.c
x86/cpuid: make cpuid_class a static const structure
2023-08-05 08:31:41 +02:00
crash_core_32.c
…
crash_core_64.c
…
crash_dump_32.c
…
crash_dump_64.c
use less confusing names for iov_iter direction initializers
2022-11-25 13:01:55 -05:00
crash.c
x86/crash: use SZ_1M macro instead of hardcoded value
2024-01-05 10:45:25 -08:00
devicetree.c
x86/of: Move the x86_flattree_get_config() call out of x86_dtb_init()
2023-10-02 21:30:09 +02:00
doublefault_32.c
x86: Avoid missing-prototype warnings for doublefault code
2023-05-18 11:56:18 -07:00
dumpstack_32.c
x86/percpu: Move irq_stack variables next to current_task
2022-10-17 16:41:05 +02:00
dumpstack_64.c
x86/percpu: Move irq_stack variables next to current_task
2022-10-17 16:41:05 +02:00
dumpstack.c
x86/show_trace_log_lvl: Ensure stack pointer is aligned, again
2023-05-16 06:31:04 -07:00
e820.c
x86/e820: Don't reserve SETUP_RNG_SEED in e820
2024-03-01 10:27:20 -08:00
early_printk.c
x86/earlyprintk: Clean up pciserial
2022-08-29 12:19:25 +02:00
early-quirks.c
x86/pci: Use PCI_HEADER_TYPE_* instead of literals
2023-12-01 15:00:43 -06:00
ebda.c
…
eisa.c
…
espfix_64.c
x86/espfix: Use get_random_long() rather than archrandom
2022-10-31 20:12:50 +01:00
ftrace_32.S
x86/headers: Replace #include <asm/export.h> with #include <linux/export.h>
2023-10-03 10:38:07 +02:00
ftrace_64.S
x86/headers: Replace #include <asm/export.h> with #include <linux/export.h>
2023-10-03 10:38:07 +02:00
ftrace.c
x86/ftrace: Remove unsued extern declaration ftrace_regs_caller_ret()
2023-07-10 21:38:13 -04:00
head32.c
x86/microcode/32: Move early loading after paging enable
2023-10-18 22:15:01 +02:00
head64.c
x86/asm: Always set A (accessed) flag in GDT descriptors
2023-12-20 10:57:51 +01:00
head_32.S
Major microcode loader restructuring, cleanup and improvements by Thomas
2023-11-04 08:46:37 -10:00
head_64.S
x86/cleanups changes for v6.8:
2024-01-08 17:23:32 -08:00
hpet.c
RTC for 6.8
2024-01-18 17:25:39 -08:00
hw_breakpoint.c
x86/amd: Cache debug register values in percpu variables
2023-01-31 20:09:26 +01:00
i8237.c
…
i8253.c
…
i8259.c
x86/i8259: Skip probing when ACPI/MADT advertises PCAT compatibility
2023-10-27 20:36:49 +02:00
ibt_selftest.S
x86/ibt: Convert IBT selftest to asm
2023-08-17 17:07:09 +02:00
idt.c
x86/entry: Convert INT 0x80 emulation to IDTENTRY
2023-12-07 09:51:29 -08:00
io_delay.c
…
ioport.c
…
irq_32.c
x86/percpu: Move irq_stack variables next to current_task
2022-10-17 16:41:05 +02:00
irq_64.c
x86/percpu: Move irq_stack variables next to current_task
2022-10-17 16:41:05 +02:00
irq_work.c
x86/apic: Wrap IPI calls into helper functions
2023-08-09 12:00:55 -07:00
irq.c
x86/apic: Nuke ack_APIC_irq()
2023-08-09 11:58:34 -07:00
irqflags.S
x86/headers: Replace #include <asm/export.h> with #include <linux/export.h>
2023-10-03 10:38:07 +02:00
irqinit.c
x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL
2023-01-16 17:24:56 +01:00
itmt.c
arch/x86: Remove now superfluous sentinel elem from ctl_table arrays
2023-10-10 15:22:02 -07:00
jailhouse.c
x86/apic: Remove the pointless APIC version check
2023-08-09 11:58:19 -07:00
jump_label.c
…
kdebugfs.c
…
kexec-bzimage64.c
x86/kexec: fix incorrect argument passed to kexec_dprintk()
2023-12-29 12:22:28 -08:00
kgdb.c
x86/kgdb: Fix a kerneldoc warning when build with W=1
2023-09-24 11:00:13 +02:00
ksysfs.c
…
kvm.c
x86/kvm: Fix SEV check in sev_map_percpu_data()
2024-01-31 16:21:01 -05:00
kvmclock.c
Generic:
2024-01-17 13:03:37 -08:00
ldt.c
arch/x86: Fix typos
2024-01-03 11:46:22 +01:00
machine_kexec_32.c
…
machine_kexec_64.c
x86/kexec: fix incorrect end address passed to kernel_ident_mapping_init()
2023-12-29 12:22:29 -08:00
Makefile
x86/boot/32: Disable stackprotector and tracing for mk_early_pgtbl_32()
2023-10-18 11:11:43 +02:00
mmconf-fam10h_64.c
…
module.c
x86/paravirt: Switch mixed paravirt/alternative calls to alternatives
2023-12-10 23:33:09 +01:00
mpparse.c
x86/apic: Sanitize APIC address setup
2023-08-09 11:58:20 -07:00
msr.c
x86/MSR: make msr_class a static const structure
2023-08-05 08:31:42 +02:00
nmi_selftest.c
x86/apic: Wrap IPI calls into helper functions
2023-08-09 12:00:55 -07:00
nmi.c
x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key
2024-02-19 16:31:49 -08:00
paravirt-spinlocks.c
…
paravirt.c
x86/paravirt: Remove no longer needed paravirt patching code
2023-12-10 23:34:37 +01:00
pci-dma.c
x86: always initialize xen-swiotlb when xen-pcifront is enabling
2023-07-31 17:54:27 +02:00
pcspeaker.c
…
perf_regs.c
…
platform-quirks.c
x86/quirks: Include linux/pnp.h for arch_pnpbios_disabled()
2023-05-18 11:56:18 -07:00
pmem.c
…
probe_roms.c
…
process_32.c
x86/resctl: fix scheduler confusion with 'current'
2023-03-08 11:48:11 -08:00
process_64.c
x86/shstk: Add ARCH_SHSTK_STATUS
2023-08-02 15:01:51 -07:00
process.c
arch/x86: Fix typos
2024-01-03 11:46:22 +01:00
process.h
…
ptrace.c
x86: Add PTRACE interface for shadow stack
2023-08-02 15:01:51 -07:00
pvclock.c
locking/atomic: treewide: use raw_atomic*_<op>()
2023-06-05 09:57:20 +02:00
quirks.c
…
reboot_fixups_32.c
…
reboot.c
x86/reboot: Expose VMCS crash hooks if and only if KVM_{INTEL,AMD} is enabled
2023-08-03 15:37:14 -07:00
relocate_kernel_32.S
x86/kexec: Disable RET on kexec
2022-07-09 13:12:32 +02:00
relocate_kernel_64.S
x86,objtool: Split UNWIND_HINT_EMPTY in two
2023-03-23 23:18:58 +01:00
resource.c
x86/PCI: Tidy E820 removal messages
2022-12-10 10:33:11 -06:00
rethook.c
…
rtc.c
rtc: Extend timeout for waiting for UIP to clear to 1s
2023-12-17 22:33:55 +01:00
setup_percpu.c
x86/asm: Add DB flag to 32-bit percpu GDT entry
2023-12-20 10:57:51 +01:00
setup.c
- Add support managing TDX host hardware
2024-01-18 13:41:48 -08:00
sev_verify_cbit.S
…
sev-shared.c
arch/x86: Fix typos
2024-01-03 11:46:22 +01:00
sev.c
x86/sev: Fix kernel crash due to late update to read-only ghcb_version
2023-11-30 10:23:12 +01:00
shstk.c
x86/shstk: Add warning for shadow stack double unmap
2023-09-19 09:18:34 -07:00
signal_32.c
x86/shstk: Add user control-protection fault handler
2023-08-02 15:01:50 -07:00
signal_64.c
x86/shstk: Delay signal entry SSP write until after user accesses
2023-11-08 08:55:37 -08:00
signal.c
rseq: Split out rseq.h from sched.h
2023-12-27 11:49:56 -05:00
smp.c
Revert "x86/smp: Put CPUs into INIT on shutdown if possible"
2023-10-15 12:02:02 -07:00
smpboot.c
x86/smp: Export symbol cpu_clustergroup_mask()
2023-11-17 10:54:52 +01:00
stacktrace.c
…
static_call.c
x86/static_call: Fix __static_call_fixup()
2023-08-17 13:24:09 +02:00
step.c
…
sys_ia32.c
…
sys_x86_64.c
x86/mm: Introduce MAP_ABOVE4G
2023-07-11 14:12:19 -07:00
tboot.c
mm: remove rb tree.
2022-09-26 19:46:16 -07:00
time.c
…
tls.c
x86/gsseg: Move load_gs_index() to its own new header file
2023-01-12 13:06:36 +01:00
tls.h
…
topology.c
x86/topology: convert to use arch_cpu_is_hotpluggable()
2023-12-06 12:41:49 +09:00
trace_clock.c
…
trace.c
…
tracepoint.c
…
traps.c
IOMMU Updates for Linux v6.8
2024-01-18 15:16:57 -08:00
tsc_msr.c
…
tsc_sync.c
x86/tsc: Defer marking TSC unstable to a worker
2023-10-27 20:36:57 +02:00
tsc.c
x86/tsc: Extend watchdog check exemption to 4-Sockets platform
2023-07-14 15:17:09 -07:00
umip.c
…
unwind_frame.c
x86: kmsan: don't instrument stack walking functions
2022-10-03 14:03:25 -07:00
unwind_guess.c
…
unwind_orc.c
x86/unwind/orc: Remove redundant initialization of 'mid' pointer in __orc_find()
2023-09-21 08:41:23 +02:00
uprobes.c
uprobes/x86: Allow to probe a NOP instruction with 0x66 prefix
2022-12-05 11:55:18 +01:00
verify_cpu.S
…
vm86_32.c
…
vmlinux.lds.S
x86/paravirt: Remove no longer needed paravirt patching code
2023-12-10 23:34:37 +01:00
vsmp_64.c
x86/apic: Use u32 for phys_pkg_id()
2023-10-10 14:38:19 +02:00
x86_init.c
- Fix a race window where load_unaligned_zeropad() could cause
2023-06-26 16:32:47 -07:00