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Message-Id: <1453737235-16522-17-git-send-email-marc.zyngier@arm.com> Date: Mon, 25 Jan 2016 15:53:50 +0000 From: Marc Zyngier <marc.zyngier@....com> To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Christoffer Dall <christoffer.dall@...aro.org> Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu Subject: [PATCH v2 16/21] arm64: KVM: VHE: Add fpsimd enabling on guest access Despite the fact that a VHE enabled kernel runs at EL2, it uses CPACR_EL1 to trap FPSIMD access. Add the required alternative code to re-enable guest FPSIMD access when it has trapped to EL2. Signed-off-by: Marc Zyngier <marc.zyngier@....com> --- arch/arm64/kvm/hyp/entry.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S index fd0fbe9..759a0ec 100644 --- a/arch/arm64/kvm/hyp/entry.S +++ b/arch/arm64/kvm/hyp/entry.S @@ -130,9 +130,15 @@ ENDPROC(__guest_exit) ENTRY(__fpsimd_guest_restore) stp x4, lr, [sp, #-16]! +alternative_if_not ARM64_HAS_VIRT_HOST_EXTN mrs x2, cptr_el2 bic x2, x2, #CPTR_EL2_TFP msr cptr_el2, x2 +alternative_else + mrs x2, cpacr_el1 + orr x2, x2, #(3 << 20) + msr cpacr_el1, x2 +alternative_endif isb mrs x3, tpidr_el2 -- 2.1.4
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