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target/i386: Expose IBPB-BRTYPE and SBPB CPUID bits to the guest

Igor Mammedovrequested to merge
imammedo/qemu-kvm-cs:IBPB-BRTYPE_9.7 into c9s

Merge Request Required Information

Summary of Changes

add to 9.7 missing SBPB feature

Approved Development Ticket(s)

JIRA: https://issues.redhat.com/browse/RHEL-17614

target/i386: Expose IBPB-BRTYPE and SBPB CPUID bits to the guest IBPB_BRTYPE was backported as commit
caebed55 target/i386: Expose bits related to SRSO vulnerability
however SBPB has been lost (commit 0701abbf target/i386: Expose IBPB-BRTYPE and SBPB CPUID bits to the guest) which introduced both features. this merge req fixes it.

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