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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 6630DC433FE for ; Mon, 20 Sep 2021 18:27:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 501BE61244 for ; Mon, 20 Sep 2021 18:27:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379260AbhITS2r (ORCPT ); Mon, 20 Sep 2021 14:28:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:44474 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1377999AbhITSW0 (ORCPT ); Mon, 20 Sep 2021 14:22:26 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 32AEE632BE; Mon, 20 Sep 2021 17:24:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632158660; bh=LeNpSld68FcxVZZOiC+BDt3NlGwhmw3SSmR5uHHuvrE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bbB/EdFsU4ayfwnWHPEVlcM6/gOniK60HLUZM08T542lPOZIKFcVUt81e4QqZawub GVs15eR3fpZ+0M9iLqRCCCtSePqtlSupJMn4484swWKNRLhLVctE6PvtiP9g3oiZ5e fSbyEUG168dd64jBzrbzd0FmUz10oqc1anBhCkVA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nicholas Piggin , Michael Ellerman Subject: [PATCH 5.4 227/260] KVM: PPC: Book3S HV: Tolerate treclaim. in fake-suspend mode changing registers Date: Mon, 20 Sep 2021 18:44:05 +0200 Message-Id: <20210920163938.832566915@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163931.123590023@linuxfoundation.org> References: <20210920163931.123590023@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nicholas Piggin commit 267cdfa21385d78c794768233678756e32b39ead upstream. POWER9 DD2.2 and 2.3 hardware implements a "fake-suspend" mode where certain TM instructions executed in HV=0 mode cause softpatch interrupts so the hypervisor can emulate them and prevent problematic processor conditions. In this fake-suspend mode, the treclaim. instruction does not modify registers. Unfortunately the rfscv instruction executed by the guest do not generate softpatch interrupts, which can cause the hypervisor to lose track of the fake-suspend mode, and it can execute this treclaim. while not in fake-suspend mode. This modifies GPRs and crashes the hypervisor. It's not trivial to disable scv in the guest with HFSCR now, because they assume a POWER9 has scv available. So this fix saves and restores checkpointed registers across the treclaim. Fixes: 7854f7545bff ("KVM: PPC: Book3S: Rework TM save/restore code and make it C-callable") Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210908101718.118522-2-npiggin@gmail.com Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 36 ++++++++++++++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-) --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -3137,7 +3137,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_P9_TM_HV_A /* The following code handles the fake_suspend = 1 case */ mflr r0 std r0, PPC_LR_STKOFF(r1) - stdu r1, -PPC_MIN_STKFRM(r1) + stdu r1, -TM_FRAME_SIZE(r1) /* Turn on TM. */ mfmsr r8 @@ -3152,10 +3152,42 @@ BEGIN_FTR_SECTION END_FTR_SECTION_IFSET(CPU_FTR_P9_TM_XER_SO_BUG) nop + /* + * It's possible that treclaim. may modify registers, if we have lost + * track of fake-suspend state in the guest due to it using rfscv. + * Save and restore registers in case this occurs. + */ + mfspr r3, SPRN_DSCR + mfspr r4, SPRN_XER + mfspr r5, SPRN_AMR + /* SPRN_TAR would need to be saved here if the kernel ever used it */ + mfcr r12 + SAVE_NVGPRS(r1) + SAVE_GPR(2, r1) + SAVE_GPR(3, r1) + SAVE_GPR(4, r1) + SAVE_GPR(5, r1) + stw r12, 8(r1) + std r1, HSTATE_HOST_R1(r13) + /* We have to treclaim here because that's the only way to do S->N */ li r3, TM_CAUSE_KVM_RESCHED TRECLAIM(R3) + GET_PACA(r13) + ld r1, HSTATE_HOST_R1(r13) + REST_GPR(2, r1) + REST_GPR(3, r1) + REST_GPR(4, r1) + REST_GPR(5, r1) + lwz r12, 8(r1) + REST_NVGPRS(r1) + mtspr SPRN_DSCR, r3 + mtspr SPRN_XER, r4 + mtspr SPRN_AMR, r5 + mtcr r12 + HMT_MEDIUM + /* * We were in fake suspend, so we are not going to save the * register state as the guest checkpointed state (since @@ -3183,7 +3215,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_P9_TM_XER_ std r5, VCPU_TFHAR(r9) std r6, VCPU_TFIAR(r9) - addi r1, r1, PPC_MIN_STKFRM + addi r1, r1, TM_FRAME_SIZE ld r0, PPC_LR_STKOFF(r1) mtlr r0 blr