From patchwork Mon Oct 8 05:31:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Mackerras X-Patchwork-Id: 10630039 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 738ED17E3 for ; Mon, 8 Oct 2018 05:31:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 64D4728A82 for ; Mon, 8 Oct 2018 05:31:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5976228ADA; Mon, 8 Oct 2018 05:31:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DA06A28A94 for ; Mon, 8 Oct 2018 05:31:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726911AbeJHMlo (ORCPT ); Mon, 8 Oct 2018 08:41:44 -0400 Received: from ozlabs.org ([203.11.71.1]:56775 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726921AbeJHMln (ORCPT ); Mon, 8 Oct 2018 08:41:43 -0400 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 42T89v2wp9z9sj2; Mon, 8 Oct 2018 16:31:47 +1100 (AEDT) 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=1538976707; bh=WwD5MLH2ANOX2Y8esOjMfBuaSZoYTlo2VIaBLD/D5eY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lD/RLIcUid41ao0l5IaImoqu2aynwG0452dSUzGc5JQNbkQNHO/EtdSH+uH4uL3n9 6v45j3CzTeKaGmgvyD3faaUHv56+ptcpAxMOY8jR3lpEX8Fj9GefIlRNvPSa8ssYk0 UaFgL6Egej9U0YMZ5X4ReNvKA9EH6pCP834OwLkWP9241yNeJCdq/ReX3HRbBjtwnH cbD3lgOdeCbUxNoEZKrfYbXiCYM+qP2EvsUG/mv14y1OIvShyBkv6sM2Mzpbd6IR2P JPprI0sjTJe4EeWcYI7msIXQYD9oWzAkPwJCQQSwqKkMI35gwqlgERa9fss4lyYKY8 525xCHkaaVleA== From: Paul Mackerras To: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org Cc: David Gibson , linuxppc-dev@ozlabs.org Subject: [PATCH v5 19/33] KVM: PPC: Book3S HV: Use XICS hypercalls when running as a nested hypervisor Date: Mon, 8 Oct 2018 16:31:05 +1100 Message-Id: <1538976679-1363-20-git-send-email-paulus@ozlabs.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1538976679-1363-1-git-send-email-paulus@ozlabs.org> References: <1538976679-1363-1-git-send-email-paulus@ozlabs.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This adds code to call the H_IPI and H_EOI hypercalls when we are running as a nested hypervisor (i.e. without the CPU_FTR_HVMODE cpu feature) and we would otherwise access the XICS interrupt controller directly or via an OPAL call. Reviewed-by: David Gibson Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_hv.c | 7 +++++- arch/powerpc/kvm/book3s_hv_builtin.c | 44 +++++++++++++++++++++++++++++------- arch/powerpc/kvm/book3s_hv_rm_xics.c | 8 +++++++ 3 files changed, 50 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index d58a4a6..dd84252 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -173,6 +173,10 @@ static bool kvmppc_ipi_thread(int cpu) { unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); + /* If we're a nested hypervisor, fall back to ordinary IPIs for now */ + if (kvmhv_on_pseries()) + return false; + /* On POWER9 we can use msgsnd to IPI any cpu */ if (cpu_has_feature(CPU_FTR_ARCH_300)) { msg |= get_hard_smp_processor_id(cpu); @@ -5173,7 +5177,8 @@ static int kvmppc_book3s_init_hv(void) * indirectly, via OPAL. */ #ifdef CONFIG_SMP - if (!xive_enabled() && !local_paca->kvm_hstate.xics_phys) { + if (!xive_enabled() && !kvmhv_on_pseries() && + !local_paca->kvm_hstate.xics_phys) { struct device_node *np; np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc"); diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index ccfea5b..a71e2fc 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -231,6 +231,15 @@ void kvmhv_rm_send_ipi(int cpu) void __iomem *xics_phys; unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); + /* For a nested hypervisor, use the XICS via hcall */ + if (kvmhv_on_pseries()) { + unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; + + plpar_hcall_raw(H_IPI, retbuf, get_hard_smp_processor_id(cpu), + IPI_PRIORITY); + return; + } + /* On POWER9 we can use msgsnd for any destination cpu. */ if (cpu_has_feature(CPU_FTR_ARCH_300)) { msg |= get_hard_smp_processor_id(cpu); @@ -460,12 +469,19 @@ static long kvmppc_read_one_intr(bool *again) return 1; /* Now read the interrupt from the ICP */ - xics_phys = local_paca->kvm_hstate.xics_phys; - rc = 0; - if (!xics_phys) - rc = opal_int_get_xirr(&xirr, false); - else - xirr = __raw_rm_readl(xics_phys + XICS_XIRR); + if (kvmhv_on_pseries()) { + unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; + + rc = plpar_hcall_raw(H_XIRR, retbuf, 0xFF); + xirr = cpu_to_be32(retbuf[0]); + } else { + xics_phys = local_paca->kvm_hstate.xics_phys; + rc = 0; + if (!xics_phys) + rc = opal_int_get_xirr(&xirr, false); + else + xirr = __raw_rm_readl(xics_phys + XICS_XIRR); + } if (rc < 0) return 1; @@ -494,7 +510,13 @@ static long kvmppc_read_one_intr(bool *again) */ if (xisr == XICS_IPI) { rc = 0; - if (xics_phys) { + if (kvmhv_on_pseries()) { + unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; + + plpar_hcall_raw(H_IPI, retbuf, + hard_smp_processor_id(), 0xff); + plpar_hcall_raw(H_EOI, retbuf, h_xirr); + } else if (xics_phys) { __raw_rm_writeb(0xff, xics_phys + XICS_MFRR); __raw_rm_writel(xirr, xics_phys + XICS_XIRR); } else { @@ -520,7 +542,13 @@ static long kvmppc_read_one_intr(bool *again) /* We raced with the host, * we need to resend that IPI, bummer */ - if (xics_phys) + if (kvmhv_on_pseries()) { + unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; + + plpar_hcall_raw(H_IPI, retbuf, + hard_smp_processor_id(), + IPI_PRIORITY); + } else if (xics_phys) __raw_rm_writeb(IPI_PRIORITY, xics_phys + XICS_MFRR); else diff --git a/arch/powerpc/kvm/book3s_hv_rm_xics.c b/arch/powerpc/kvm/book3s_hv_rm_xics.c index 8b9f356..b3f5786 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_xics.c +++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c @@ -767,6 +767,14 @@ static void icp_eoi(struct irq_chip *c, u32 hwirq, __be32 xirr, bool *again) void __iomem *xics_phys; int64_t rc; + if (kvmhv_on_pseries()) { + unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; + + iosync(); + plpar_hcall_raw(H_EOI, retbuf, hwirq); + return; + } + rc = pnv_opal_pci_msi_eoi(c, hwirq); if (rc)