arm64: KVM: Report SMCCC_ARCH_WORKAROUND_1 BP hardening support
authorMarc Zyngier <marc.zyngier@arm.com>
Tue, 6 Feb 2018 17:56:14 +0000 (17:56 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 16 Feb 2018 19:22:55 +0000 (20:22 +0100)
commite47273d086236d06c3c2851fa8599971086b2a73
treeb20bfdb1d9399b6a69700089c2b99acbc5134cce
parent2cfe8929f6247dbee8def7e94f334909fe5ac084
arm64: KVM: Report SMCCC_ARCH_WORKAROUND_1 BP hardening support

Commit 6167ec5c9145 upstream.

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>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/arm/include/asm/kvm_host.h
arch/arm64/include/asm/kvm_host.h
include/linux/arm-smccc.h
virt/kvm/arm/psci.c