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arm64: KVM: Report SMCCC_ARCH_WORKAROUND_1 BP hardening support

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A new feature of SMCCC 1.1 is that it offers firmware-based CPU
workarounds. In particular, SMCCC_ARCH_WORKAROUND_1 provides
BP hardening for CVE-2017-5715.

If the host has some mitigation for this issue, report that
we deal with it using SMCCC_ARCH_WORKAROUND_1, as we apply the
host workaround on every guest exit.

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Marc Zyngier
2018-02-06 17:56:14 +00:00
committed by Catalin Marinas
parent a4097b3511
commit 6167ec5c91
4 changed files with 26 additions and 1 deletions
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7
arch/arm/include/asm/kvm_host.h
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@@ -306,4 +306,11 @@ static inline void kvm_fpsimd_flush_cpu_state(void) {}
static inline void kvm_arm_vhe_guest_enter(void) {}
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;
}
#endif /* __ARM_KVM_HOST_H__ */