Merge 4.19.266 into android-4.19-stable

Changes in 4.19.266
	Revert "x86/speculation: Add RSB VM Exit protections"
	Revert "x86/cpu: Add a steppings field to struct x86_cpu_id"
	x86/cpufeature: Add facility to check for min microcode revisions
	x86/cpufeature: Fix various quality problems in the <asm/cpu_device_hd.h> header
	x86/devicetable: Move x86 specific macro out of generic code
	x86/cpu: Add consistent CPU match macros
	x86/cpu: Add a steppings field to struct x86_cpu_id
	x86/cpufeatures: Move RETPOLINE flags to word 11
	x86/bugs: Report AMD retbleed vulnerability
	x86/bugs: Add AMD retbleed= boot parameter
	x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value
	x86/entry: Remove skip_r11rcx
	x86/entry: Add kernel IBRS implementation
	x86/bugs: Optimize SPEC_CTRL MSR writes
	x86/speculation: Add spectre_v2=ibrs option to support Kernel IBRS
	x86/bugs: Split spectre_v2_select_mitigation() and spectre_v2_user_select_mitigation()
	x86/bugs: Report Intel retbleed vulnerability
	intel_idle: Disable IBRS during long idle
	x86/speculation: Change FILL_RETURN_BUFFER to work with objtool
	x86/speculation: Fix RSB filling with CONFIG_RETPOLINE=n
	x86/speculation: Fix firmware entry SPEC_CTRL handling
	x86/speculation: Fix SPEC_CTRL write on SMT state change
	x86/speculation: Use cached host SPEC_CTRL value for guest entry/exit
	x86/speculation: Remove x86_spec_ctrl_mask
	KVM: VMX: Prevent guest RSB poisoning attacks with eIBRS
	KVM: VMX: Fix IBRS handling after vmexit
	x86/speculation: Fill RSB on vmexit for IBRS
	x86/common: Stamp out the stepping madness
	x86/cpu/amd: Enumerate BTC_NO
	x86/bugs: Add Cannon lake to RETBleed affected CPU list
	x86/speculation: Disable RRSBA behavior
	x86/speculation: Use DECLARE_PER_CPU for x86_spec_ctrl_current
	x86/bugs: Warn when "ibrs" mitigation is selected on Enhanced IBRS parts
	x86/speculation: Add RSB VM Exit protections
	Linux 4.19.266

Change-Id: Ia1f5cd5ad1ff8635df2df23afc1c87db8de97d86
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>