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ARM: 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.

Tested-by: Keerthy <j-keerthy@ti.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Catalin Marinas <catalin.marinas@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 19:37:55 +01:00 committed by Christoffer Dall
parent 5d224aa7d4
commit 6bebcecb6c
1 changed files with 24 additions and 5 deletions
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29
arch/arm/kvm/hyp/hyp-entry.S
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@ -126,11 +126,30 @@ hyp_hvc:
*/
pop {r0, r1, r2}
/* Check for __hyp_get_vectors */
cmp r0, #HVC_GET_VECTORS
mrceq p15, 4, r0, c12, c0, 0 @ get HVBAR
beq 1f
/*
* Check if we have a kernel function, which is guaranteed to be
* bigger than the maximum hyp stub hypercall
*/
cmp r0, #HVC_STUB_HCALL_NR
bhs 1f
/*
* Not a kernel function, treat it as a stub hypercall.
* Compute the physical address for __kvm_handle_stub_hvc
* (as the code lives in the idmaped page) and branch there.
* We hijack ip (r12) as a tmp register.
*/
push {r1}
ldr r1, =kimage_voffset
ldr r1, [r1]
ldr ip, =__kvm_handle_stub_hvc
sub ip, ip, r1
THUMB( add ip, ip, #1)
pop {r1}
bx ip
1:
push {lr}
mov lr, r0
@ -142,7 +161,7 @@ THUMB( orr lr, #1)
blx lr @ Call the HYP function
pop {lr}
1: eret
eret
guest_trap:
load_vcpu r0 @ Load VCPU pointer to r0