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authorChristoffer Dall <christoffer.dall@linaro.org>2014-11-27 10:35:03 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2014-12-13 14:15:27 +0100
commit957db105c99792ae8ef61ffc9ae77d910f6471da (patch)
tree7a752a94484cc703dfdbf62424f0ef496e03fa88 /arch/arm64/include
parentcf5d318865e25f887d49a0c6083bbc6dcd1905b1 (diff)
downloadlinux-957db105c99792ae8ef61ffc9ae77d910f6471da.tar.gz
arm/arm64: KVM: Introduce stage2_unmap_vm
Introduce a new function to unmap user RAM regions in the stage2 page tables. This is needed on reboot (or when the guest turns off the MMU) to ensure we fault in pages again and make the dcache, RAM, and icache coherent. Using unmap_stage2_range for the whole guest physical range does not work, because that unmaps IO regions (such as the GIC) which will not be recreated or in the best case faulted in on a page-by-page basis. Call this function on secondary and subsequent calls to the KVM_ARM_VCPU_INIT ioctl so that a reset VCPU will detect the guest Stage-1 MMU is off when faulting in pages and make the caches coherent. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm64/include')
-rw-r--r--arch/arm64/include/asm/kvm_mmu.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 123b521a9908..14a74f136272 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -83,6 +83,7 @@ int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
void free_boot_hyp_pgd(void);
void free_hyp_pgds(void);
+void stage2_unmap_vm(struct kvm *kvm);
int kvm_alloc_stage2_pgd(struct kvm *kvm);
void kvm_free_stage2_pgd(struct kvm *kvm);
int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,