Borislav Petkov 6e0925dcbe x86/cpu: Load microcode during restore_processor_state() ... commit f9e14dbbd4 upstream. When resuming from system sleep state, restore_processor_state() restores the boot CPU MSRs. These MSRs could be emulated by microcode. If microcode is not loaded yet, writing to emulated MSRs leads to unchecked MSR access error: ... PM: Calling lapic_suspend+0x0/0x210 unchecked MSR access error: WRMSR to 0x10f (tried to write 0x0...0) at rIP: ... (native_write_msr) Call Trace: <TASK> ? restore_processor_state x86_acpi_suspend_lowlevel acpi_suspend_enter suspend_devices_and_enter pm_suspend.cold state_store kobj_attr_store sysfs_kf_write kernfs_fop_write_iter new_sync_write vfs_write ksys_write __x64_sys_write do_syscall_64 entry_SYSCALL_64_after_hwframe RIP: 0033:0x7fda13c260a7 To ensure microcode emulated MSRs are available for restoration, load the microcode on the boot CPU before restoring these MSRs. [ Pawan: write commit message and productize it. ] Fixes: e2a1256b17 ("x86/speculation: Restore speculation related MSRs during S3 resume") Reported-by: Kyle D. Pelton <kyle.d.pelton@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Tested-by: Kyle D. Pelton <kyle.d.pelton@intel.com> Cc: stable@vger.kernel.org Link: https://bugzilla.kernel.org/show_bug.cgi?id=215841 Link: https://lore.kernel.org/r/4350dfbf785cd482d3fafa72b2b49c83102df3ce.1650386317.git.pawan.kumar.gupta@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-05-12 12:17:08 +02:00
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cpu.c	x86/cpu: Load microcode during restore_processor_state()	2022-05-12 12:17:08 +02:00
hibernate_32.c	x86/power: Fix swsusp_arch_resume prototype	2018-04-26 11:02:16 +02:00
hibernate_64.c	PM / hibernate: Check the success of generating md5 digest before hibernation	2019-11-24 08:23:02 +01:00
hibernate_asm_32.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
hibernate_asm_64.S	x86/power/64: Do not refer to __PAGE_OFFSET from assembly code	2016-08-03 01:35:38 +02:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00