[PATCH ARM32 v4.4 V2 03/47] arm64: KVM: Report SMCCC_ARCH_WORKAROUND_1 BP hardening support
From: Viresh Kumar <viresh.kumar@linaro.org>
Date: 2019-08-01 08:19:45
Also in:
stable
Subsystem:
secure monitor call(smc) calling convention (smccc), the rest · Maintainers:
Mark Rutland, Lorenzo Pieralisi, Sudeep Holla, Linus Torvalds
From: Marc Zyngier <redacted> commit 6167ec5c9145cdf493722dfd80a5d48bafc4a18a 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 <redacted> Reviewed-by: Christoffer Dall <redacted> Signed-off-by: Marc Zyngier <redacted> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> [ Viresh: Picked on only arm-smccc.h changes ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> --- include/linux/arm-smccc.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index da9f3916f9a9..1f02e4045a9e 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h@@ -73,6 +73,11 @@ ARM_SMCCC_SMC_32, \ 0, 1) +#define ARM_SMCCC_ARCH_WORKAROUND_1 \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_32, \ + 0, 0x8000) + #ifndef __ASSEMBLY__ /**
--
2.21.0.rc0.269.g1a574e7a288b
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