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arm64: KVM: Enable Common Not Private translations

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We rely on cpufeature framework to detect and enable CNP so for KVM we
need to patch hyp to set CNP bit just before TTBR0_EL2 gets written.

For the guest we encode CNP bit while building vttbr, so we don't need
to bother with that in a world switch.

Reviewed-by: James Morse <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Signed-off-by: Vladimir Murzin <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
This commit is contained in:
Vladimir Murzin 2018-07-31 14:08:57 +01:00 • committed by Catalin Marinas
commit ab510027dc
6 changed files with 17 additions and 2 deletions
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4
virt/kvm/arm/arm.c
View file

@ -496,7 +496,7 @@ static bool need_new_vmid_gen(struct kvm *kvm)
static void update_vttbr(struct kvm *kvm)
{
phys_addr_t pgd_phys;
u64 vmid;
u64 vmid, cnp = kvm_cpu_has_cnp() ? VTTBR_CNP_BIT : 0;
bool new_gen;
read_lock(&kvm_vmid_lock);
@ -546,7 +546,7 @@ static void update_vttbr(struct kvm *kvm)
pgd_phys = virt_to_phys(kvm->arch.pgd);
BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
kvm->arch.vttbr = kvm_phys_to_vttbr(pgd_phys) | vmid;
kvm->arch.vttbr = kvm_phys_to_vttbr(pgd_phys) | vmid | cnp;
write_unlock(&kvm_vmid_lock);
}