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| author | Will Deacon <will@kernel.org> | 2021-12-15 19:12:30 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-12-16 15:58:57 +0300 |
| commit | b8cc6eb5bded7078f796b2ebf548f79850281eb6 (patch) | |
| tree | 237edfad285279a772cedec4b19c979bd866d86e /arch/arm64/kvm/hyp/nvhe/hyp-main.c | |
| parent | 376a240f037959c2b9a2486e53bcd8d388cbec17 (diff) | |
| download | linux-b8cc6eb5bded7078f796b2ebf548f79850281eb6.tar.xz | |
KVM: arm64: Expose unshare hypercall to the host
Introduce an unshare hypercall which can be used to unmap memory from
the hypervisor stage-1 in nVHE protected mode. This will be useful to
update the EL2 ownership state of pages during guest teardown, and
avoids keeping dangling mappings to unreferenced portions of memory.
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211215161232.1480836-14-qperret@google.com
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/hyp-main.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/hyp-main.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index b096bf009144..5e2197db0d32 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -147,6 +147,13 @@ static void handle___pkvm_host_share_hyp(struct kvm_cpu_context *host_ctxt) cpu_reg(host_ctxt, 1) = __pkvm_host_share_hyp(pfn); } +static void handle___pkvm_host_unshare_hyp(struct kvm_cpu_context *host_ctxt) +{ + DECLARE_REG(u64, pfn, host_ctxt, 1); + + cpu_reg(host_ctxt, 1) = __pkvm_host_unshare_hyp(pfn); +} + static void handle___pkvm_create_private_mapping(struct kvm_cpu_context *host_ctxt) { DECLARE_REG(phys_addr_t, phys, host_ctxt, 1); @@ -184,6 +191,7 @@ static const hcall_t host_hcall[] = { HANDLE_FUNC(__pkvm_prot_finalize), HANDLE_FUNC(__pkvm_host_share_hyp), + HANDLE_FUNC(__pkvm_host_unshare_hyp), HANDLE_FUNC(__kvm_adjust_pc), HANDLE_FUNC(__kvm_vcpu_run), HANDLE_FUNC(__kvm_flush_vm_context), |