[PATCH for 4.21 v7 3/4] xen/riscv: make zbb as mandatory

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

According to riscv/booting.txt, it is expected that Zbb should be supported.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in v7:
 - new patch.
---
 xen/arch/riscv/arch.mk | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/xen/arch/riscv/arch.mk b/xen/arch/riscv/arch.mk
index 3034da76cb..236ea7c8a6 100644
--- a/xen/arch/riscv/arch.mk
+++ b/xen/arch/riscv/arch.mk
@@ -9,7 +9,7 @@ riscv-abi-$(CONFIG_RISCV_64) := -mabi=lp64
 riscv-march-$(CONFIG_RISCV_64) := rv64
 riscv-march-y += ima
 riscv-march-$(CONFIG_RISCV_ISA_C) += c
-riscv-march-y += _zicsr_zifencei
+riscv-march-y += _zicsr_zifencei_zbb
 
 riscv-generic-flags := $(riscv-abi-y) -march=$(subst 
$(space),,$(riscv-march-y))
 
@@ -25,13 +25,10 @@ $(eval $(1) := \
        $(call as-insn,$(CC) $(riscv-generic-flags)_$(1),$(value 
$(1)-insn),_$(1)))
 endef
 
-zbb-insn := "andn t0$(comma)t0$(comma)t0"
-$(call check-extension,zbb)
-
 zihintpause-insn := "pause"
 $(call check-extension,zihintpause)
 
-extensions := $(zbb) $(zihintpause)
+extensions := $(zihintpause)
 
 extensions := $(subst $(space),,$(extensions))
 
-- 
2.48.1