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arm64: KVM: Allow the main HYP code to use the init hyp stub implementation

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We now have a full hyp-stub implementation in the KVM init code,
but the main KVM code only supports HVC_GET_VECTORS, which is not
enough.

Instead of reinventing the wheel, let's reuse the init implementation
by branching to the idmap page when called with a hyp-stub hypercall.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Marc Zyngier 2017-04-03 19:37:42 +01:00 committed by Christoffer Dall
parent 82529d9bfd
commit 5fbe9a599a
1 changed files with 19 additions and 5 deletions
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24
arch/arm64/kvm/hyp/hyp-entry.S
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@ -87,10 +87,24 @@ alternative_endif
/* Here, we're pretty sure the host called HVC. */
ldp x0, x1, [sp], #16
cmp x0, #HVC_GET_VECTORS
b.ne 1f
mrs x0, vbar_el2
b 2f
/* Check for a stub HVC call */
cmp x0, #HVC_STUB_HCALL_NR
b.hs 1f
/*
* Compute the idmap address of __kvm_handle_stub_hvc and
* jump there. Since we use kimage_voffset, do not use the
* HYP VA for __kvm_handle_stub_hvc, but the kernel VA instead
* (by loading it from the constant pool).
*
* Preserve x0-x4, which may contain stub parameters.
*/
ldr x5, =__kvm_handle_stub_hvc
ldr_l x6, kimage_voffset
/* x5 = __pa(x5) */
sub x5, x5, x6
br x5
1:
/*
@ -99,7 +113,7 @@ alternative_endif
kern_hyp_va x0
do_el2_call
2: eret
eret
el1_trap:
/*