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authorMarc Zyngier <marc.zyngier@arm.com>2016-04-05 16:11:47 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2016-04-06 13:33:14 +0200
commit6141570c36f0c937d5deff20d9cf08cbd8d8ed48 (patch)
tree321db1eba7dba333aed3b4f22305c02227ff3038 /arch/arm64/include/asm/kvm_asm.h
parent1c5631c73fc2261a5df64a72c155cb53dcdc0c45 (diff)
downloadlinux-6141570c36f0c937d5deff20d9cf08cbd8d8ed48.tar.gz
arm64: KVM: Warn when PARange is less than 40 bits
We always thought that 40bits of PA range would be the minimum people would actually build. Anything less is terrifyingly small. Turns out that we were both right and wrong. Nobody has ever built such a system, but the ARM Foundation Model has a PARange set to 36bits. Just because we can. Oh well. Now, the KVM API explicitely says that we offer a 40bit PA space to the VM, so we shouldn't run KVM on the Foundation Model at all. That being said, this patch offers a less agressive alternative, and loudly warns about the configuration being unsupported. You'll still be able to run VMs (at your own risks, though). This is just a workaround until we have a proper userspace API where we report the PARange to userspace. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm64/include/asm/kvm_asm.h')
-rw-r--r--arch/arm64/include/asm/kvm_asm.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index eb7490d232a0..40a0a24e6c98 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -54,7 +54,7 @@ extern void __vgic_v3_init_lrs(void);
extern u32 __kvm_get_mdcr_el2(void);
-extern void __init_stage2_translation(void);
+extern u32 __init_stage2_translation(void);
#endif