mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-27 04:47:05 +00:00
Code Issues Releases Wiki Activity
linux-stable/arch/x86/kernel
History
Juergen Gross 237be8079a x86/mtrr: Support setting MTRR state for software defined MTRRs 
[ Upstream commit 29055dc742 ]

When running virtualized, MTRR access can be reduced (e.g. in Xen PV
guests or when running as a SEV-SNP guest under Hyper-V). Typically, the
hypervisor will not advertize the MTRR feature in CPUID data, resulting
in no MTRR memory type information being available for the kernel.

This has turned out to result in problems (Link tags below):

- Hyper-V SEV-SNP guests using uncached mappings where they shouldn't
- Xen PV dom0 mapping memory as WB which should be UC- instead

Solve those problems by allowing an MTRR static state override,
overwriting the empty state used today. In case such a state has been
set, don't call get_mtrr_state() in mtrr_bp_init().

The set state will only be used by mtrr_type_lookup(), as in all other
cases mtrr_enabled() is being checked, which will return false. Accept
the overwrite call only for selected cases when running as a guest.
Disable X86_FEATURE_MTRR in order to avoid any MTRR modifications by
just refusing them.

  [ bp: Massage. ]

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/all/4fe9541e-4d4c-2b2a-f8c8-2d34a7284930@nerdbynature.de/
Link: https://lore.kernel.org/lkml/BYAPR21MB16883ABC186566BD4D2A1451D7FE9@BYAPR21MB1688.namprd21.prod.outlook.com
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Stable-dep-of: a153f254e5 ("x86/xen: Set MTRR state when running as Xen PV initial domain")
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-07-11 19:39:25 +02:00
..
acpi x86/acpi/boot: Correct acpi_is_processor_usable() check 2023-03-30 11:07:30 +02:00
apic x86/apic: Fix kernel panic when booting with intremap=off and x2apic_phys 2023-06-28 11:14:24 +02:00
cpu x86/mtrr: Support setting MTRR state for software defined MTRRs 2023-07-11 19:39:25 +02:00
fpu x86/fpu/xstate: Prevent false-positive warning in __copy_xstate_uabi_buf() 2023-03-22 10:59:13 -07:00
kprobes probes updates for 6.3: 2023-02-23 13:03:08 -08:00
.gitignore
alternative.c x86/alternatives: Teach text_poke_bp() to patch Jcc.d32 instructions 2023-01-31 15:05:31 +01:00
amd_gart_64.c x86/mm: Remove P*D_PAGE_MASK and P*D_PAGE_SIZE macros 2022-12-15 10:37:27 -08:00
amd_nb.c x86/amd_nb: Add PCI ID for family 19h model 78h 2023-05-17 14:02:07 +02:00
aperture_64.c x86: Fix various duplicate-word comment typos 2022-08-15 19:17:52 +02:00
apm_32.c efi: x86: Wire up IBT annotation in memory attributes table 2023-02-09 19:30:54 +01:00
asm-offsets.c - Fixup comment typo 2023-02-25 09:11:30 -08:00
asm-offsets_32.c
asm-offsets_64.c x86: Fixup asm-offsets duplicate 2022-10-17 16:41:06 +02:00
audit_64.c
bootflag.c
callthunks.c x86/calldepth: Fix incorrect init section references 2022-12-27 12:51:58 +01:00
cfi.c x86: Add support for CONFIG_CFI_CLANG 2022-09-26 10:13:16 -07:00
check.c
cpuid.c driver core: make struct class.devnode() take a const * 2022-11-24 17:12:27 +01:00
crash.c x86/crash: Disable virt in core NMI crash handler to avoid double shootdown 2023-01-24 10:05:21 -08:00
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
devicetree.c x86/of: Add support for boot time interrupt delivery mode configuration 2022-12-02 14:57:14 +01:00
doublefault_32.c
dumpstack.c x86/show_trace_log_lvl: Ensure stack pointer is aligned, again 2023-05-30 14:17:26 +01:00
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
e820.c x86/setup: Move duplicate boot_cpu_data definition out of the ifdeffery 2023-01-11 12:45:16 +01:00
early-quirks.c
early_printk.c x86/earlyprintk: Clean up pciserial 2022-08-29 12:19:25 +02:00
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.c New Feature: 2022-12-17 14:06:53 -06:00
ftrace_32.S
ftrace_64.S ftrace,kcfi: Define ftrace_stub_graph conditionally 2023-03-09 22:17:06 -05:00
head32.c
head64.c x86/mm: Remove P*D_PAGE_MASK and P*D_PAGE_SIZE macros 2022-12-15 10:37:27 -08:00
head_32.S x86/asm/32: Remove setup_once() 2022-12-02 14:06:34 +01:00
head_64.S x86/head/64: Switch to KERNEL_CS as soon as new GDT is installed 2023-06-21 16:02:04 +02:00
hpet.c clocksource: Verify HPET and PMTMR when TSC unverified 2023-02-02 14:23:02 -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: Mark legacy PIC interrupts with IRQ_LEVEL 2023-01-16 17:24:56 +01:00
idt.c
io_delay.c
ioport.c
irq.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
irqflags.S
irqinit.c x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL 2023-01-16 17:24:56 +01:00
itmt.c
jailhouse.c
jump_label.c
kdebugfs.c
kexec-bzimage64.c integrity-v6.0 2022-08-02 15:21:18 -07:00
kgdb.c
ksysfs.c
kvm.c ARM64: 2022-12-15 11:12:21 -08:00
kvmclock.c sched/clock/x86: Mark sched_clock() noinstr 2023-01-31 15:01:47 +01:00
ldt.c
machine_kexec_32.c
machine_kexec_64.c
Makefile rethook, fprobe: do not trace rethook related functions 2023-05-24 17:30:24 +01:00
mmconf-fam10h_64.c
module.c Livepatching changes for 6.3 2023-02-23 14:00:10 -08:00
mpparse.c
msr.c driver core: make struct class.devnode() take a const * 2022-11-24 17:12:27 +01:00
nmi.c ARM: 2023-02-25 11:30:21 -08:00
nmi_selftest.c
paravirt-spinlocks.c
paravirt.c - Cache the AMD debug registers in per-CPU variables to avoid MSR writes 2023-02-21 14:51:40 -08:00
pci-dma.c
pcspeaker.c
perf_regs.c
platform-quirks.c
pmem.c
probe_roms.c
process.c x86/smp: Dont access non-existing CPUID leaf 2023-07-01 13:14:43 +02:00
process.h
process_32.c x86/resctl: fix scheduler confusion with 'current' 2023-03-08 11:48:11 -08:00
process_64.c x86/resctl: fix scheduler confusion with 'current' 2023-03-08 11:48:11 -08:00
ptrace.c x86: Improve formatting of user_regset arrays 2022-11-01 15:36:52 -07:00
pvclock.c sched/clock/x86: Mark sched_clock() noinstr 2023-01-31 15:01:47 +01:00
quirks.c
reboot.c x86/reboot: Disable virtualization in an emergency if SVM is supported 2023-01-24 10:05:22 -08:00
reboot_fixups_32.c
relocate_kernel_32.S
relocate_kernel_64.S x86/callthunks: Add call patching for call depth tracking 2022-10-17 16:41:13 +02:00
resource.c x86/PCI: Tidy E820 removal messages 2022-12-10 10:33:11 -06:00
rethook.c
rtc.c x86/rtc: Simplify PNP ids check 2023-01-06 04:22:34 +01:00
setup.c x86/mtrr: Support setting MTRR state for software defined MTRRs 2023-07-11 19:39:25 +02:00
setup_percpu.c - Add the call depth tracking mitigation for Retbleed which has 2022-12-14 15:03:00 -08:00
sev-shared.c Revert "x86/sev: Expose sev_es_ghcb_hv_call() for use by HyperV" 2022-07-27 18:09:13 +02:00
sev.c x86/sev: Fix calculation of end address based on number of pages 2023-07-11 19:39:21 +02:00
sev_verify_cbit.S
signal.c x86/signal: Fix the value returned by strict_sas_size() 2023-01-15 09:54:27 +01:00
signal_32.c - Cache the AMD debug registers in per-CPU variables to avoid MSR writes 2023-02-21 14:51:40 -08:00
signal_64.c x86/signal/compat: Move sigaction_compat_abi() to signal_64.c 2023-01-06 04:16:02 +01:00
smp.c x86/smp: Cure kexec() vs. mwait_play_dead() breakage 2023-07-01 13:14:44 +02:00
smpboot.c x86/smp: Cure kexec() vs. mwait_play_dead() breakage 2023-07-01 13:14:44 +02:00
stacktrace.c
static_call.c x86/static_call: Add support for Jcc tail-calls 2023-01-31 15:05:31 +01:00
step.c
sys_ia32.c
sys_x86_64.c
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/cpu: Switch to cpu_feature_enabled() for X86_FEATURE_XENPV 2022-11-22 16:18:19 +01:00
trace.c
trace_clock.c
tracepoint.c
traps.c - Add the call depth tracking mitigation for Retbleed which has 2022-12-14 15:03:00 -08:00
tsc.c Updates for timekeeping, timers and clockevent/source drivers: 2023-02-21 09:45:13 -08:00
tsc_msr.c
tsc_sync.c
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: Add ELF section with ORC version identifier 2023-06-28 11:14:24 +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 objtool/idle: Validate __cpuidle code as noinstr 2023-01-13 11:48:15 +01:00
vsmp_64.c
x86_init.c x86/mm: Allow guest.enc_status_change_prepare() to fail 2023-07-11 19:39:23 +02:00