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>

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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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include/linux/arm-smccc.h

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