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KVM: arm64: Rework detection of SVE, !VHE systems 

An SVE system is so far the only case where we mandate VHE. As we're
starting to grow this requirements, let's slightly rework the way we
deal with that situation, allowing for easy extension of this check.

Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Marc Zyngier 2018-12-06 17:31:20 +00:00 committed by Will Deacon
parent c987876a80
commit 33e5f4e509
3 changed files with 8 additions and 8 deletions
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2
arch/arm/include/asm/kvm_host.h
View File

@ -285,7 +285,7 @@ void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
static inline bool kvm_arch_check_sve_has_vhe(void) { return true; }
static inline bool kvm_arch_requires_vhe(void) { return false; }
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}

6
arch/arm64/include/asm/kvm_host.h
View File

@ -422,7 +422,7 @@ static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
}
}
static inline bool kvm_arch_check_sve_has_vhe(void)
static inline bool kvm_arch_requires_vhe(void)
{
/*
* The Arm architecture specifies that implementation of SVE
@ -430,9 +430,9 @@ static inline bool kvm_arch_check_sve_has_vhe(void)
* relies on this when SVE is present:
*/
if (system_supports_sve())
return has_vhe();
else
return true;
return false;
}
static inline void kvm_arch_hardware_unsetup(void) {}

8
virt/kvm/arm/arm.c
View File

@ -1640,8 +1640,10 @@ int kvm_arch_init(void *opaque)
return -ENODEV;
}
if (!kvm_arch_check_sve_has_vhe()) {
kvm_pr_unimpl("SVE system without VHE unsupported. Broken cpu?");
in_hyp_mode = is_kernel_in_hyp_mode();
if (!in_hyp_mode && kvm_arch_requires_vhe()) {
kvm_pr_unimpl("CPU unsupported in non-VHE mode, not initializing\n");
return -ENODEV;
}
@ -1657,8 +1659,6 @@ int kvm_arch_init(void *opaque)
if (err)
return err;
in_hyp_mode = is_kernel_in_hyp_mode();
if (!in_hyp_mode) {
err = init_hyp_mode();
if (err)