[4.9,V2,15/24] ARM: KVM: report support for SMCCC_ARCH_WORKAROUND_1

Message ID 20181107164402.9380-16-dave.long@linaro.org
State New
Headers show
Series
  • V4.9 backport of 32-bit arm spectre patches
Related show

Commit Message

David Long Nov. 7, 2018, 4:43 p.m.
From: Russell King <rmk+kernel@armlinux.org.uk>


Commit add5609877c6785cc002c6ed7e008b1d61064439 upstream.

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>

Signed-off-by: David A. Long <dave.long@linaro.org>

---
 arch/arm/include/asm/kvm_host.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

-- 
2.17.1

Patch

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 0833d8a1dbbb..2fda7e905754 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>
@@ -323,8 +324,17 @@  static inline int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 
 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;
+	}
 }
 
 #define KVM_SSBD_UNKNOWN		-1