[PATCH v4 15/15] ARM: KVM: report support for SMCCC_ARCH_WORKAROUND_1
From: Russell King <hidden>
Date: 2018-05-29 09:10:15
Also in:
kvmarm
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Report support for SMCCC_ARCH_WORKAROUND_1 to KVM guests for affected CPUs. Signed-off-by: Russell King <redacted> Boot-tested-by: Tony Lindgren [off-list ref] Reviewed-by: Tony Lindgren <tony@atomide.com> --- arch/arm/include/asm/kvm_host.h | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 248b930563e5..11f91744ffb0 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h@@ -21,6 +21,7 @@ #include <linux/types.h> #include <linux/kvm_types.h> +#include <asm/cputype.h> #include <asm/kvm.h> #include <asm/kvm_asm.h> #include <asm/kvm_mmio.h>
@@ -311,8 +312,17 @@ static inline void kvm_arm_vhe_guest_exit(void) {} static inline bool kvm_arm_harden_branch_predictor(void) { - /* No way to detect it yet, pretend it is not there. */ - return false; + switch(read_cpuid_part()) { +#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR + case ARM_CPU_PART_BRAHMA_B15: + case ARM_CPU_PART_CORTEX_A12: + case ARM_CPU_PART_CORTEX_A15: + case ARM_CPU_PART_CORTEX_A17: + return true; +#endif + default: + return false; + } } #endif /* __ARM_KVM_HOST_H__ */
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2.7.4