File 61f933a4-x86-cpuid-advertise-SSB_NO.patch of Package xen.23582

# Commit 15b7611efd497c4b65f350483857082cb70fc348
# Date 2022-02-01 13:20:44 +0000
# Author Andrew Cooper <andrew.cooper3@citrix.com>
# Committer Andrew Cooper <andrew.cooper3@citrix.com>
x86/cpuid: Advertise SSB_NO to guests by default

This is a statement of hardware behaviour, and not related to controls for the
guest kernel to use.  Pass it straight through from hardware.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -262,7 +262,7 @@ XEN_CPUFEATURE(IBRS_SAME_MODE, 8*32+19)
 XEN_CPUFEATURE(AMD_PPIN,      8*32+23) /*   Protected Processor Inventory Number */
 XEN_CPUFEATURE(AMD_SSBD,      8*32+24) /*   MSR_SPEC_CTRL.SSBD available */
 XEN_CPUFEATURE(VIRT_SSBD,     8*32+25) /*   MSR_VIRT_SPEC_CTRL.SSBD */
-XEN_CPUFEATURE(SSB_NO,        8*32+26) /*   Hardware not vulnerable to SSB */
+XEN_CPUFEATURE(SSB_NO,        8*32+26) /*A  Hardware not vulnerable to SSB */
 XEN_CPUFEATURE(PSFD,          8*32+28) /*   MSR_SPEC_CTRL.PSFD */
 
 /* Intel-defined CPU features, CPUID level 0x00000007:0.edx, word 9 */