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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 577F9C4320A for ; Wed, 25 Aug 2021 16:19:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E59861165 for ; Wed, 25 Aug 2021 16:19:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242135AbhHYQUM (ORCPT ); Wed, 25 Aug 2021 12:20:12 -0400 Received: from foss.arm.com ([217.140.110.172]:54768 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241987AbhHYQS6 (ORCPT ); Wed, 25 Aug 2021 12:18:58 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 183DC14BF; Wed, 25 Aug 2021 09:18:12 -0700 (PDT) Received: from monolith.cable.virginm.net (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BDAE53F66F; Wed, 25 Aug 2021 09:18:10 -0700 (PDT) From: Alexandru Elisei To: maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, will@kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v4 37/39] KVM: arm64: Add PMSIDR_EL1 to the SPE register context Date: Wed, 25 Aug 2021 17:18:13 +0100 Message-Id: <20210825161815.266051-38-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210825161815.266051-1-alexandru.elisei@arm.com> References: <20210825161815.266051-1-alexandru.elisei@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PMSIDR_EL1 is not part of the VCPU register context because the profiling control registers were not trapped and the register is read-only. With the introduction of the KVM_ARM_VCPU_SPE_STOP API, KVM will start trapping accesses to the profiling control registers, add PMSIDR_EL1 to the VCPU register context to prevent undefined exceptions in the guest. Signed-off-by: Alexandru Elisei --- arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/sys_regs.c | 22 +++++++++++++++++++--- 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index cc46f1406196..f866c4556ff9 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -247,6 +247,7 @@ enum vcpu_sysreg { PMSFCR_EL1, /* Sampling Filter Control Register */ PMSEVFR_EL1, /* Sampling Event Filter Register */ PMSLATFR_EL1, /* Sampling Latency Filter Register */ + PMSIDR_EL1, /* Sampling Profiling ID Register */ PMBLIMITR_EL1, /* Profiling Buffer Limit Address Register */ PMBPTR_EL1, /* Profiling Buffer Write Pointer Register */ PMBSR_EL1, /* Profiling Buffer Status/syndrome Register */ diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index cc711b081f31..1a85a0cedbec 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -603,6 +603,18 @@ static unsigned int spe_visibility(const struct kvm_vcpu *vcpu, return REG_HIDDEN; } +static void reset_pmsidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + /* + * When SPE is stopped by userspace, the guest reads the in-memory value + * of the register. When SPE is resumed, accesses to the control + * registers are not trapped and the guest reads the hardware + * value. Reset PMSIDR_EL1 to the hardware value to avoid mistmatches + * between the two. + */ + vcpu_write_sys_reg(vcpu, read_sysreg_s(SYS_PMSIDR_EL1), PMSIDR_EL1); +} + static bool access_spe_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) { int reg = r->reg; @@ -613,10 +625,14 @@ static bool access_spe_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *p, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); } - if (p->is_write) + if (p->is_write) { + if (reg == PMSIDR_EL1) + return write_to_read_only(vcpu, p, r); + kvm_spe_write_sysreg(vcpu, reg, val); - else + } else { p->regval = kvm_spe_read_sysreg(vcpu, reg); + } return true; } @@ -1568,7 +1584,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SPE_SYS_REG(SYS_PMSFCR_EL1), .reg = PMSFCR_EL1 }, { SPE_SYS_REG(SYS_PMSEVFR_EL1), .reg = PMSEVFR_EL1 }, { SPE_SYS_REG(SYS_PMSLATFR_EL1), .reg = PMSLATFR_EL1 }, - { SPE_SYS_REG(SYS_PMSIDR_EL1), .reset = NULL }, + { SPE_SYS_REG(SYS_PMSIDR_EL1), .reset = reset_pmsidr, .reg = PMSIDR_EL1 }, { SPE_SYS_REG(SYS_PMBLIMITR_EL1), .reg = PMBLIMITR_EL1 }, { SPE_SYS_REG(SYS_PMBPTR_EL1), .reg = PMBPTR_EL1 }, { SPE_SYS_REG(SYS_PMBSR_EL1), .reg = PMBSR_EL1 }, -- 2.33.0 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=-16.8 required=3.0 tests=BAYES_00, 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 6D838C4338F for ; Wed, 25 Aug 2021 16:20:14 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 14AB361153 for ; Wed, 25 Aug 2021 16:20:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 14AB361153 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id BDF274B29B; Wed, 25 Aug 2021 12:20:13 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VGHV0PrUX95S; Wed, 25 Aug 2021 12:20:09 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 4C5D74B2E0; Wed, 25 Aug 2021 12:19:03 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 333834B2F8 for ; Wed, 25 Aug 2021 12:19:00 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IoBBFocEXHBI for ; Wed, 25 Aug 2021 12:18:55 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 5AD4C4B2A3 for ; Wed, 25 Aug 2021 12:18:12 -0400 (EDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 183DC14BF; Wed, 25 Aug 2021 09:18:12 -0700 (PDT) Received: from monolith.cable.virginm.net (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BDAE53F66F; Wed, 25 Aug 2021 09:18:10 -0700 (PDT) From: Alexandru Elisei To: maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, will@kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v4 37/39] KVM: arm64: Add PMSIDR_EL1 to the SPE register context Date: Wed, 25 Aug 2021 17:18:13 +0100 Message-Id: <20210825161815.266051-38-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210825161815.266051-1-alexandru.elisei@arm.com> References: <20210825161815.266051-1-alexandru.elisei@arm.com> MIME-Version: 1.0 X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu PMSIDR_EL1 is not part of the VCPU register context because the profiling control registers were not trapped and the register is read-only. With the introduction of the KVM_ARM_VCPU_SPE_STOP API, KVM will start trapping accesses to the profiling control registers, add PMSIDR_EL1 to the VCPU register context to prevent undefined exceptions in the guest. Signed-off-by: Alexandru Elisei --- arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/sys_regs.c | 22 +++++++++++++++++++--- 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index cc46f1406196..f866c4556ff9 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -247,6 +247,7 @@ enum vcpu_sysreg { PMSFCR_EL1, /* Sampling Filter Control Register */ PMSEVFR_EL1, /* Sampling Event Filter Register */ PMSLATFR_EL1, /* Sampling Latency Filter Register */ + PMSIDR_EL1, /* Sampling Profiling ID Register */ PMBLIMITR_EL1, /* Profiling Buffer Limit Address Register */ PMBPTR_EL1, /* Profiling Buffer Write Pointer Register */ PMBSR_EL1, /* Profiling Buffer Status/syndrome Register */ diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index cc711b081f31..1a85a0cedbec 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -603,6 +603,18 @@ static unsigned int spe_visibility(const struct kvm_vcpu *vcpu, return REG_HIDDEN; } +static void reset_pmsidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + /* + * When SPE is stopped by userspace, the guest reads the in-memory value + * of the register. When SPE is resumed, accesses to the control + * registers are not trapped and the guest reads the hardware + * value. Reset PMSIDR_EL1 to the hardware value to avoid mistmatches + * between the two. + */ + vcpu_write_sys_reg(vcpu, read_sysreg_s(SYS_PMSIDR_EL1), PMSIDR_EL1); +} + static bool access_spe_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) { int reg = r->reg; @@ -613,10 +625,14 @@ static bool access_spe_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *p, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); } - if (p->is_write) + if (p->is_write) { + if (reg == PMSIDR_EL1) + return write_to_read_only(vcpu, p, r); + kvm_spe_write_sysreg(vcpu, reg, val); - else + } else { p->regval = kvm_spe_read_sysreg(vcpu, reg); + } return true; } @@ -1568,7 +1584,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SPE_SYS_REG(SYS_PMSFCR_EL1), .reg = PMSFCR_EL1 }, { SPE_SYS_REG(SYS_PMSEVFR_EL1), .reg = PMSEVFR_EL1 }, { SPE_SYS_REG(SYS_PMSLATFR_EL1), .reg = PMSLATFR_EL1 }, - { SPE_SYS_REG(SYS_PMSIDR_EL1), .reset = NULL }, + { SPE_SYS_REG(SYS_PMSIDR_EL1), .reset = reset_pmsidr, .reg = PMSIDR_EL1 }, { SPE_SYS_REG(SYS_PMBLIMITR_EL1), .reg = PMBLIMITR_EL1 }, { SPE_SYS_REG(SYS_PMBPTR_EL1), .reg = PMBPTR_EL1 }, { SPE_SYS_REG(SYS_PMBSR_EL1), .reg = PMBSR_EL1 }, -- 2.33.0 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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=-17.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 612F0C4338F for ; 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Wed, 25 Aug 2021 09:18:10 -0700 (PDT) From: Alexandru Elisei To: maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, will@kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v4 37/39] KVM: arm64: Add PMSIDR_EL1 to the SPE register context Date: Wed, 25 Aug 2021 17:18:13 +0100 Message-Id: <20210825161815.266051-38-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210825161815.266051-1-alexandru.elisei@arm.com> References: <20210825161815.266051-1-alexandru.elisei@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210825_091812_869283_20FA7A2D X-CRM114-Status: GOOD ( 16.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org PMSIDR_EL1 is not part of the VCPU register context because the profiling control registers were not trapped and the register is read-only. With the introduction of the KVM_ARM_VCPU_SPE_STOP API, KVM will start trapping accesses to the profiling control registers, add PMSIDR_EL1 to the VCPU register context to prevent undefined exceptions in the guest. Signed-off-by: Alexandru Elisei --- arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/sys_regs.c | 22 +++++++++++++++++++--- 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index cc46f1406196..f866c4556ff9 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -247,6 +247,7 @@ enum vcpu_sysreg { PMSFCR_EL1, /* Sampling Filter Control Register */ PMSEVFR_EL1, /* Sampling Event Filter Register */ PMSLATFR_EL1, /* Sampling Latency Filter Register */ + PMSIDR_EL1, /* Sampling Profiling ID Register */ PMBLIMITR_EL1, /* Profiling Buffer Limit Address Register */ PMBPTR_EL1, /* Profiling Buffer Write Pointer Register */ PMBSR_EL1, /* Profiling Buffer Status/syndrome Register */ diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index cc711b081f31..1a85a0cedbec 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -603,6 +603,18 @@ static unsigned int spe_visibility(const struct kvm_vcpu *vcpu, return REG_HIDDEN; } +static void reset_pmsidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + /* + * When SPE is stopped by userspace, the guest reads the in-memory value + * of the register. When SPE is resumed, accesses to the control + * registers are not trapped and the guest reads the hardware + * value. Reset PMSIDR_EL1 to the hardware value to avoid mistmatches + * between the two. + */ + vcpu_write_sys_reg(vcpu, read_sysreg_s(SYS_PMSIDR_EL1), PMSIDR_EL1); +} + static bool access_spe_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) { int reg = r->reg; @@ -613,10 +625,14 @@ static bool access_spe_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *p, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu)); } - if (p->is_write) + if (p->is_write) { + if (reg == PMSIDR_EL1) + return write_to_read_only(vcpu, p, r); + kvm_spe_write_sysreg(vcpu, reg, val); - else + } else { p->regval = kvm_spe_read_sysreg(vcpu, reg); + } return true; } @@ -1568,7 +1584,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SPE_SYS_REG(SYS_PMSFCR_EL1), .reg = PMSFCR_EL1 }, { SPE_SYS_REG(SYS_PMSEVFR_EL1), .reg = PMSEVFR_EL1 }, { SPE_SYS_REG(SYS_PMSLATFR_EL1), .reg = PMSLATFR_EL1 }, - { SPE_SYS_REG(SYS_PMSIDR_EL1), .reset = NULL }, + { SPE_SYS_REG(SYS_PMSIDR_EL1), .reset = reset_pmsidr, .reg = PMSIDR_EL1 }, { SPE_SYS_REG(SYS_PMBLIMITR_EL1), .reg = PMBLIMITR_EL1 }, { SPE_SYS_REG(SYS_PMBPTR_EL1), .reg = PMBPTR_EL1 }, { SPE_SYS_REG(SYS_PMBSR_EL1), .reg = PMBSR_EL1 }, -- 2.33.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel