diff options
| author | David Brazdil <dbrazdil@google.com> | 2020-12-02 18:41:16 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-12-04 10:08:35 +0000 |
| commit | 04e05f057a04275cb68c8053b29c5642ae0bad4f (patch) | |
| tree | c6492219b1c59c488ca9e4191cb9d854e11b87b4 /arch/arm64/kvm | |
| parent | f74e1e2128b7681f0d9c2a66dc4480e7d7196b49 (diff) | |
| download | linux-04e05f057a04275cb68c8053b29c5642ae0bad4f.tar.bz2 | |
KVM: arm64: Add function to enter host from KVM nVHE hyp code
All nVHE hyp code is currently executed as handlers of host's HVCs. This
will change as nVHE starts intercepting host's PSCI CPU_ON SMCs. The
newly booted CPU will need to initialize EL2 state and then enter the
host. Add __host_enter function that branches into the existing
host state-restoring code after the trap handler would have returned.
Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201202184122.26046-21-dbrazdil@google.com
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/host.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S index 2b56f0bdf874..a820dfdc9c25 100644 --- a/arch/arm64/kvm/hyp/nvhe/host.S +++ b/arch/arm64/kvm/hyp/nvhe/host.S @@ -39,6 +39,7 @@ SYM_FUNC_START(__host_exit) bl handle_trap /* Restore host regs x0-x17 */ +__host_enter_restore_full: ldp x0, x1, [x29, #CPU_XREG_OFFSET(0)] ldp x2, x3, [x29, #CPU_XREG_OFFSET(2)] ldp x4, x5, [x29, #CPU_XREG_OFFSET(4)] @@ -62,6 +63,14 @@ __host_enter_without_restoring: SYM_FUNC_END(__host_exit) /* + * void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt); + */ +SYM_FUNC_START(__host_enter) + mov x29, x0 + b __host_enter_restore_full +SYM_FUNC_END(__host_enter) + +/* * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par); */ SYM_FUNC_START(__hyp_do_panic) |