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Groups > linux.kernel > #1332289
| Path | csiph.com!aioe.org!bofh.it!news.nic.it!robomod |
|---|---|
| From | Marc Zyngier <marc.zyngier@arm.com> |
| Newsgroups | linux.kernel |
| Subject | [PATCH v4 17/23] arm64: KVM: VHE: Add fpsimd enabling on guest access |
| Date | Thu, 11 Feb 2016 19:50:01 +0100 |
| Message-ID | <r14tr-4eC-7@gated-at.bofh.it> (permalink) |
| References | <r14tr-4eC-3@gated-at.bofh.it> |
| X-Mailer | git-send-email 2.1.4 |
| Sender | robomod@news.nic.it |
| List-ID | <linux-kernel.vger.kernel.org> |
| X-Mailing-List | linux-kernel@vger.kernel.org |
| Approved | robomod@news.nic.it |
| Lines | 33 |
| Organization | linux.* mail to news gateway |
| X-Original-Cc | linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu |
| X-Original-Date | Thu, 11 Feb 2016 18:39:58 +0000 |
| X-Original-Message-ID | <1455216004-19499-18-git-send-email-marc.zyngier@arm.com> |
| X-Original-References | <1455216004-19499-1-git-send-email-marc.zyngier@arm.com> |
| X-Original-Sender | linux-kernel-owner@vger.kernel.org |
| Xref | csiph.com linux.kernel:1332289 |
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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. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.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..ce9e5e5 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, #CPACR_EL1_FPEN + msr cpacr_el1, x2 +alternative_endif isb mrs x3, tpidr_el2 -- 2.1.4
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[PATCH v4 17/23] arm64: KVM: VHE: Add fpsimd enabling on guest access Marc Zyngier <marc.zyngier@arm.com> - 2016-02-11 19:50 +0100
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