diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2018-05-16 11:29:30 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-05-31 11:09:03 +0100 |
| commit | add5609877c6785cc002c6ed7e008b1d61064439 (patch) | |
| tree | 9329f307119da93c63d1558dc3bcd78fd71d625e | |
| parent | b800acfc70d9fb81fbd6df70f2cf5e20f70023d0 (diff) | |
ARM: KVM: report support for SMCCC_ARCH_WORKAROUND_1
Report support for SMCCC_ARCH_WORKAROUND_1 to KVM guests for affected
CPUs.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Boot-tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
| -rw-r--r-- | arch/arm/include/asm/kvm_host.h | 14 |
1 files 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__ */ |