diff options
| author | Kalesh Singh <kaleshsingh@google.com> | 2022-04-20 14:42:54 -0700 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-04-28 20:53:13 +0100 |
| commit | ce3354318a57875dc59f4bb841662e95bfba03db (patch) | |
| tree | 5b9676a2923ce4b733a1536df84eacd6ea2e2600 /arch/arm64/kvm/mmu.c | |
| parent | f922c13e778d6d5343d4576be785a8204c595113 (diff) | |
KVM: arm64: Add guard pages for KVM nVHE hypervisor stack
Map the stack pages in the flexible private VA range and allocate
guard pages below the stack as unbacked VA space. The stack is aligned
so that any valid stack address has PAGE_SHIFT bit as 1 - this is used
for overflow detection (implemented in a subsequent patch in the series).
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220420214317.3303360-4-kaleshsingh@google.com
Diffstat (limited to 'arch/arm64/kvm/mmu.c')
| -rw-r--r-- | arch/arm64/kvm/mmu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 7de1e02ebfd1..088e14eae4cf 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -258,8 +258,8 @@ static bool kvm_host_owns_hyp_mappings(void) return true; } -static int __create_hyp_mappings(unsigned long start, unsigned long size, - unsigned long phys, enum kvm_pgtable_prot prot) +int __create_hyp_mappings(unsigned long start, unsigned long size, + unsigned long phys, enum kvm_pgtable_prot prot) { int err; |