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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5A3B5C433F5 for ; Tue, 23 Nov 2021 10:27:23 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Hz0gs6QfCz3hKS for ; Tue, 23 Nov 2021 21:27:21 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=c/Vsdg1V; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::62a; helo=mail-pl1-x62a.google.com; envelope-from=npiggin@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=c/Vsdg1V; dkim-atps=neutral Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Hyzy23zvmz3cbs for ; Tue, 23 Nov 2021 20:54:34 +1100 (AEDT) Received: by mail-pl1-x62a.google.com with SMTP id u11so16615917plf.3 for ; Tue, 23 Nov 2021 01:54:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=tvJfKlnz4gV4r5wKUDKbsrHZzUVgF63ul+VuHwlqK8o=; b=c/Vsdg1V+pBtnbnku/oWy+aau9pQw+FVs+qvEZqcGqrBynxGfy+4bZrWbNkF5vm3FB Nll8AZi2AMtzkRKdBYeJKI/hEYg4ef15HvMfJwzWTZShUB6AKGV6Nly+A9hZEPwuwJhD viRlvhwVYuZ05llT3jUrFjP6Gnhk9ZxBXvdcV0VhjmBbkBwRhS2guCftij2s4Z/jhUgj z+hk1JsbEtUX5QF4FYg5JcBV4tPEoluFflXGDqjfCMA2BHK7Y99lSU6LaflY3HqZtzOj UNgNNNuUv7Sd1zoDWihbOh+Ar5vvDBC5i/TwsQnC7NsuXm7DCoL5oare4j7Hkrr0GaZ6 4Kpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=tvJfKlnz4gV4r5wKUDKbsrHZzUVgF63ul+VuHwlqK8o=; b=SJLDQdx5iFvYUpQu895a3JeE6VZBXr9kwMN8RpQ6WroQp8AzQz4/wkCJaw0YcMrR+/ 5Iy2qIvyiin5N4RBKCTt1erE1e6GaGwGMuJR4KT3qe2k+kUp0A5BUF2xXik4Tpc8/T7a 5wAB/UoNBLaVBdYBz8TUU769fvCHcI3FsKo38ROpsBiDFGRVxSb+9YXkL8JhuBZ2fNIw XPvcdf27cBr7O5v7P2OloAlxKnDq+O1yHCxlEg8wX1kfvaZX/XJtP9pjb53zHZZqTXYY bi3LaE+3JV7lB43YSLOV2x/h1BUZOmmJ12J6U4MrTxIdUlSk+n4LaGuuEFRXg5R+TbIV /XLQ== X-Gm-Message-State: AOAM533eitOLj9zPgadY5jW+PBk2nXjDMdLPUQJTnmFWugDLzMrGmYH4 5DtBJhcYhK/ISnDgHuR3y8ua/+JOJoMyAQ== X-Google-Smtp-Source: ABdhPJw446cNLu3eX4ienIDWDllFmAhWrQCQ09IQbIocLCXT7lQHzW/okLsKzpOuic4p53Pz1cqtSQ== X-Received: by 2002:a17:902:c7d5:b0:143:72b7:2ca5 with SMTP id r21-20020a170902c7d500b0014372b72ca5mr5574418pla.20.1637661272223; Tue, 23 Nov 2021 01:54:32 -0800 (PST) Received: from bobo.ibm.com ([124.170.11.53]) by smtp.gmail.com with ESMTPSA id j8sm12662176pfc.8.2021.11.23.01.54.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Nov 2021 01:54:32 -0800 (PST) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v4 52/53] KVM: PPC: Book3S HV P9: Stop using vc->dpdes Date: Tue, 23 Nov 2021 19:52:30 +1000 Message-Id: <20211123095231.1036501-53-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20211123095231.1036501-1-npiggin@gmail.com> References: <20211123095231.1036501-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" The P9 path uses vc->dpdes only for msgsndp / SMT emulation. This adds an ordering requirement between vcpu->doorbell_request and vc->dpdes for no real benefit. Use vcpu->doorbell_request directly. Signed-off-by: Nicholas Piggin --- arch/powerpc/kvm/book3s_hv.c | 18 ++++++++++-------- arch/powerpc/kvm/book3s_hv_builtin.c | 2 ++ arch/powerpc/kvm/book3s_hv_p9_entry.c | 14 ++++++++++---- 3 files changed, 22 insertions(+), 12 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 2d598291d8cf..214481e5d56d 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -761,6 +761,8 @@ static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu) if (vcpu->arch.doorbell_request) return true; + if (cpu_has_feature(CPU_FTR_ARCH_300)) + return false; /* * Ensure that the read of vcore->dpdes comes after the read * of vcpu->doorbell_request. This barrier matches the @@ -2185,8 +2187,10 @@ static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, * either vcore->dpdes or doorbell_request. * On POWER8, doorbell_request is 0. */ - *val = get_reg_val(id, vcpu->arch.vcore->dpdes | - vcpu->arch.doorbell_request); + if (cpu_has_feature(CPU_FTR_ARCH_300)) + *val = get_reg_val(id, vcpu->arch.doorbell_request); + else + *val = get_reg_val(id, vcpu->arch.vcore->dpdes); break; case KVM_REG_PPC_VTB: *val = get_reg_val(id, vcpu->arch.vcore->vtb); @@ -2423,7 +2427,10 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, vcpu->arch.pspb = set_reg_val(id, *val); break; case KVM_REG_PPC_DPDES: - vcpu->arch.vcore->dpdes = set_reg_val(id, *val); + if (cpu_has_feature(CPU_FTR_ARCH_300)) + vcpu->arch.doorbell_request = set_reg_val(id, *val) & 1; + else + vcpu->arch.vcore->dpdes = set_reg_val(id, *val); break; case KVM_REG_PPC_VTB: vcpu->arch.vcore->vtb = set_reg_val(id, *val); @@ -4491,11 +4498,6 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, if (!nested) { kvmppc_core_prepare_to_enter(vcpu); - if (vcpu->arch.doorbell_request) { - vc->dpdes = 1; - smp_wmb(); - vcpu->arch.doorbell_request = 0; - } if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, &vcpu->arch.pending_exceptions)) lpcr |= LPCR_MER; diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index ad70756a777c..7d6d91338c3f 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -649,6 +649,8 @@ void kvmppc_guest_entry_inject_int(struct kvm_vcpu *vcpu) int ext; unsigned long lpcr; + WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); + /* Insert EXTERNAL bit into LPCR at the MER bit position */ ext = (vcpu->arch.pending_exceptions >> BOOK3S_IRQPRIO_EXTERNAL) & 1; lpcr = mfspr(SPRN_LPCR); diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c index 6120cdf281b9..72119bc13e1d 100644 --- a/arch/powerpc/kvm/book3s_hv_p9_entry.c +++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c @@ -780,6 +780,7 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc unsigned long host_pidr; unsigned long host_dawr1; unsigned long host_dawrx1; + unsigned long dpdes; hdec = time_limit - *tb; if (hdec < 0) @@ -842,8 +843,10 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc if (vc->pcr) mtspr(SPRN_PCR, vc->pcr | PCR_MASK); - if (vc->dpdes) - mtspr(SPRN_DPDES, vc->dpdes); + if (vcpu->arch.doorbell_request) { + vcpu->arch.doorbell_request = 0; + mtspr(SPRN_DPDES, 1); + } if (dawr_enabled()) { if (vcpu->arch.dawr0 != host_dawr0) @@ -1074,7 +1077,10 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc vcpu->arch.shregs.sprg2 = mfspr(SPRN_SPRG2); vcpu->arch.shregs.sprg3 = mfspr(SPRN_SPRG3); - vc->dpdes = mfspr(SPRN_DPDES); + dpdes = mfspr(SPRN_DPDES); + if (dpdes) + vcpu->arch.doorbell_request = 1; + vc->vtb = mfspr(SPRN_VTB); dec = mfspr(SPRN_DEC); @@ -1136,7 +1142,7 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc } } - if (vc->dpdes) + if (dpdes) mtspr(SPRN_DPDES, 0); if (vc->pcr) mtspr(SPRN_PCR, PCR_MASK); -- 2.23.0