From patchwork Tue Nov 23 09:52:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicholas Piggin X-Patchwork-Id: 1558450 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.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=pPUOjmly; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=112.213.38.117; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4Hz0Mw2tvhz9sRK for ; Tue, 23 Nov 2021 21:13:32 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Hz0Mv73Htz3g50 for ; Tue, 23 Nov 2021 21:13:31 +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=pPUOjmly; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::630; helo=mail-pl1-x630.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=pPUOjmly; dkim-atps=neutral Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) (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 4HyzxG0bXTz2yNv for ; Tue, 23 Nov 2021 20:53:53 +1100 (AEDT) Received: by mail-pl1-x630.google.com with SMTP id b11so16578493pld.12 for ; Tue, 23 Nov 2021 01:53:53 -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=nw+tyfcHLpLdeHB2w2xt0EdeJ3op84k0Tqa/00/sMlA=; b=pPUOjmly82+PiNoz+TN7aRgxQY59umSv0TfZLqAuPpEE1P9YzrVzwY5YS/5ibYFTpx twEM3KZiPX0FYLvUqexh4+53X/fydjgJpzOaowKeoL64xrWzIQpQnJfVX+OpnsG+DVVF Ct4Y6/8Tt/k0nppUyZZtgEH0RjivNZV6cFL1OIdPEHyuq0gyIkXZYuiTJWkeLun2WoXT brnvp/98tUDxH5v5riayg1UjTB5TrWMqMTJ8fMUXcptKLS0lrZMOQ4hlCycT12DeMw/m fHcFpOEf1pQRCHv67h+4iY7B71KnKgjCZ6LY1iPrPd9rcbholPERpD84q1lXnrXPj8+v T6Mw== 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=nw+tyfcHLpLdeHB2w2xt0EdeJ3op84k0Tqa/00/sMlA=; b=J/wFhr47gpVffplBHEFJa0Ke3PGXAy14k12g2p8uiXzejpoEPwGNaRZhzAyXTCIuCk NZ4kazijNwzstS0Sa0dvCt3+hdzCtYhBCdmV4GK0n5IP4ueM+pGhQ5+tXuTVjUNTv1rE uwEbM9LX3WfZBPP181f1fmnSoNfeee3hm5KphaHxhAvpbO7R/ikC4eX0uvgrtR1U2UFy w5DEXmtg/OtMB3EVsFCDvy6WfFehNR7y33puJRu98RADDQ1kdLjkCOSkzyA3ll8rA1Kn +yrYZlxcUC38b+BBBhz9T+IQfPcimlKFAF1P2l7rT6Ih43dzKgynTbDrtMFwoO39gSfO SHjw== X-Gm-Message-State: AOAM5312ZjE3e8e/jRjY7a/4uOK47FtUzr5wLQk6lIiO4Fupc3gb6GwK eO28tczRCzpd6HdKq239dUxOMgkHaxIQiQ== X-Google-Smtp-Source: ABdhPJz1SuQ6a0II440/dJXpsAaqMGogvCIUyncMc9ipsuqTDarvuonv4EQMFSa4m9smsULv/dSq4Q== X-Received: by 2002:a17:90b:4a50:: with SMTP id lb16mr1273653pjb.147.1637661232166; Tue, 23 Nov 2021 01:53:52 -0800 (PST) Received: from bobo.ibm.com ([124.170.11.53]) by smtp.gmail.com with ESMTPSA id j8sm12662176pfc.8.2021.11.23.01.53.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Nov 2021 01:53:51 -0800 (PST) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v4 32/53] KVM: PPC: Book3S HV P9: Implement TM fastpath for guest entry/exit Date: Tue, 23 Nov 2021 19:52:10 +1000 Message-Id: <20211123095231.1036501-33-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 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+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" If TM is not active, only TM register state needs to be saved and restored, avoiding several mfmsr/mtmsrd instructions and improving performance. Signed-off-by: Nicholas Piggin --- arch/powerpc/kvm/book3s_hv_p9_entry.c | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c index fa080533bd8d..6bef509bccb8 100644 --- a/arch/powerpc/kvm/book3s_hv_p9_entry.c +++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c @@ -287,11 +287,20 @@ bool load_vcpu_state(struct kvm_vcpu *vcpu, { bool ret = false; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM if (cpu_has_feature(CPU_FTR_TM) || cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) { - kvmppc_restore_tm_hv(vcpu, vcpu->arch.shregs.msr, true); - ret = true; + unsigned long guest_msr = vcpu->arch.shregs.msr; + if (MSR_TM_ACTIVE(guest_msr)) { + kvmppc_restore_tm_hv(vcpu, guest_msr, true); + ret = true; + } else { + mtspr(SPRN_TEXASR, vcpu->arch.texasr); + mtspr(SPRN_TFHAR, vcpu->arch.tfhar); + mtspr(SPRN_TFIAR, vcpu->arch.tfiar); + } } +#endif load_spr_state(vcpu, host_os_sprs); @@ -315,9 +324,19 @@ void store_vcpu_state(struct kvm_vcpu *vcpu) #endif vcpu->arch.vrsave = mfspr(SPRN_VRSAVE); +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM if (cpu_has_feature(CPU_FTR_TM) || - cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) - kvmppc_save_tm_hv(vcpu, vcpu->arch.shregs.msr, true); + cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) { + unsigned long guest_msr = vcpu->arch.shregs.msr; + if (MSR_TM_ACTIVE(guest_msr)) { + kvmppc_save_tm_hv(vcpu, guest_msr, true); + } else { + vcpu->arch.texasr = mfspr(SPRN_TEXASR); + vcpu->arch.tfhar = mfspr(SPRN_TFHAR); + vcpu->arch.tfiar = mfspr(SPRN_TFIAR); + } + } +#endif } EXPORT_SYMBOL_GPL(store_vcpu_state);