From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CCCBFC64EBC for ; Thu, 4 Oct 2018 13:26:42 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4E4CD2082A for ; Thu, 4 Oct 2018 13:26:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ozlabs.org header.i=@ozlabs.org header.b="fbm8WV2Y" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4E4CD2082A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ozlabs.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 42Qtvh4M08zF3Hd for ; Thu, 4 Oct 2018 23:26:40 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=ozlabs.org header.i=@ozlabs.org header.b="fbm8WV2Y"; dkim-atps=neutral Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 42Qrvp0HNszF3Jp for ; Thu, 4 Oct 2018 21:56:38 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=ozlabs.org header.i=@ozlabs.org header.b="fbm8WV2Y"; dkim-atps=neutral Received: by ozlabs.org (Postfix) id 42Qrvn4PVgz9s8T; Thu, 4 Oct 2018 21:56:37 +1000 (AEST) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPSA id 42Qrvm72gCzB4N6; Thu, 4 Oct 2018 21:56:36 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ozlabs.org; s=201707; t=1538654197; bh=Gv3Gxij/gYTxPAT+jCXgVeUY64zcRxcmaib1+nXNLZk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fbm8WV2YuZoXlhQz1ES0FhMfGEv5NUYTz0xJyd9P1gs9yUYLz+y3s9T0F3jTVswDz 62Wu4g+2o6R4yfTemSUI56yaZ9R+Zl1mXOjEWBSyi9gDN3Ja8RmIWrB0NF9pWMtPpz nOdGf/LO4+IqIR+CLqP8pg9Yhf1uXiGR8HZlAzFkoyiTLz2+D0glyTptvym2FK0zws 4KwjG0TDgikTLU8ZalJdTg1g9eHE5PuOms2hQrTSXr9cGsvN85nsNSvYTydjAvz1Ly Aph0UVWVRjBLsk7bKgYz6JzrUPraVq+E0UkVBu1fYPzw/q5gAnoREnykrvSpLZWj6m eebM0FFhK7soA== From: Paul Mackerras To: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org Subject: [PATCH v4 29/32] KVM: PPC: Book3S HV: Handle differing endianness for H_ENTER_NESTED Date: Thu, 4 Oct 2018 21:56:06 +1000 Message-Id: <1538654169-15602-30-git-send-email-paulus@ozlabs.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1538654169-15602-1-git-send-email-paulus@ozlabs.org> References: <1538654169-15602-1-git-send-email-paulus@ozlabs.org> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@ozlabs.org, David Gibson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Suraj Jitindar Singh The hcall H_ENTER_NESTED takes two parameters: the address in L1 guest memory of a hv_regs struct and the address of a pt_regs struct. The hcall requests the L0 hypervisor to use the register values in these structs to run a L2 guest and to return the exit state of the L2 guest in these structs. These are in the endianness of the L1 guest, rather than being always big-endian as is usually the case for PAPR hypercalls. This is convenient because it means that the L1 guest can pass the address of the regs field in its kvm_vcpu_arch struct. This also improves performance slightly by avoiding the need for two copies of the pt_regs struct. When reading/writing these structures, this patch handles the case where the endianness of the L1 guest differs from that of the L0 hypervisor, by byteswapping the structures after reading and before writing them back. Since all the fields of the pt_regs are of the same type, i.e., unsigned long, we treat it as an array of unsigned longs. The fields of struct hv_guest_state are not all the same, so its fields are byteswapped individually. Reviewed-by: David Gibson Signed-off-by: Suraj Jitindar Singh Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_hv_nested.c | 51 ++++++++++++++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c index f54f779..8c0da00 100644 --- a/arch/powerpc/kvm/book3s_hv_nested.c +++ b/arch/powerpc/kvm/book3s_hv_nested.c @@ -50,6 +50,48 @@ void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr) hr->ppr = vcpu->arch.ppr; } +static void byteswap_pt_regs(struct pt_regs *regs) +{ + unsigned long *addr = (unsigned long *) regs; + + for (; addr < ((unsigned long *) (regs + 1)); addr++) + *addr = swab64(*addr); +} + +static void byteswap_hv_regs(struct hv_guest_state *hr) +{ + hr->version = swab64(hr->version); + hr->lpid = swab32(hr->lpid); + hr->vcpu_token = swab32(hr->vcpu_token); + hr->lpcr = swab64(hr->lpcr); + hr->pcr = swab64(hr->pcr); + hr->amor = swab64(hr->amor); + hr->dpdes = swab64(hr->dpdes); + hr->hfscr = swab64(hr->hfscr); + hr->tb_offset = swab64(hr->tb_offset); + hr->dawr0 = swab64(hr->dawr0); + hr->dawrx0 = swab64(hr->dawrx0); + hr->ciabr = swab64(hr->ciabr); + hr->hdec_expiry = swab64(hr->hdec_expiry); + hr->purr = swab64(hr->purr); + hr->spurr = swab64(hr->spurr); + hr->ic = swab64(hr->ic); + hr->vtb = swab64(hr->vtb); + hr->hdar = swab64(hr->hdar); + hr->hdsisr = swab64(hr->hdsisr); + hr->heir = swab64(hr->heir); + hr->asdr = swab64(hr->asdr); + hr->srr0 = swab64(hr->srr0); + hr->srr1 = swab64(hr->srr1); + hr->sprg[0] = swab64(hr->sprg[0]); + hr->sprg[1] = swab64(hr->sprg[1]); + hr->sprg[2] = swab64(hr->sprg[2]); + hr->sprg[3] = swab64(hr->sprg[3]); + hr->pidr = swab64(hr->pidr); + hr->cfar = swab64(hr->cfar); + hr->ppr = swab64(hr->ppr); +} + static void save_hv_return_state(struct kvm_vcpu *vcpu, int trap, struct hv_guest_state *hr) { @@ -174,6 +216,8 @@ long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu) sizeof(struct hv_guest_state)); if (err) return H_PARAMETER; + if (kvmppc_need_byteswap(vcpu)) + byteswap_hv_regs(&l2_hv); if (l2_hv.version != HV_GUEST_STATE_VERSION) return H_P2; @@ -182,7 +226,8 @@ long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu) sizeof(struct pt_regs)); if (err) return H_PARAMETER; - + if (kvmppc_need_byteswap(vcpu)) + byteswap_pt_regs(&l2_regs); if (l2_hv.vcpu_token >= NR_CPUS) return H_PARAMETER; @@ -254,6 +299,10 @@ long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu) kvmhv_put_nested(l2); /* copy l2_hv_state and regs back to guest */ + if (kvmppc_need_byteswap(vcpu)) { + byteswap_hv_regs(&l2_hv); + byteswap_pt_regs(&l2_regs); + } err = kvm_vcpu_write_guest(vcpu, hv_ptr, &l2_hv, sizeof(struct hv_guest_state)); if (err) -- 2.7.4