From patchwork Thu Aug 15 07:15:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bibo Mao X-Patchwork-Id: 13764439 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A04FE17ADFC; Thu, 15 Aug 2024 07:15:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723706151; cv=none; b=E2Mn3e6pLyOqABSd7wJmRzh3hRTk3ShubbOmqwTfx3q0vL53Pud9JhUtzpIJVzorDvl9UepPX6Njauht8xldrjqgvX2K1FVdZUsWYJXRbv70VKxXAvHjmhXU0PyHnLrQ9o718nmyzXCVe99sIlDxJqmQHPbhq18ZTy6ipWiT/3k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723706151; c=relaxed/simple; bh=XwxX7wfC039v3HPoXz/Mn4ccT8GfN0n6+e/njz3hac8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ArnMXHMMAzftHHBfckPU/7OBe/84z18/31JiE7U9J7cnrVdaoepvMDjOOCtmY0TO9SKKmDZh5Pao+fGFXrHrbLXm8wU4ChX0PBfGrnyXOszLM+Xx5S5UgarNDUJs8j9YMsVk3Y/dmpbkjUlU4PzR5TYtdxI7kG/RaEzFq4bvyjw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8Dxi+oiq71mpIsUAA--.49242S3; Thu, 15 Aug 2024 15:15:46 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowMDxG2chq71mlesUAA--.1465S4; Thu, 15 Aug 2024 15:15:46 +0800 (CST) From: Bibo Mao To: Tianrui Zhao , Huacai Chen Cc: WANG Xuerui , kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] LoongArch: KVM: Invalid guest steal time address on vCPU reset Date: Thu, 15 Aug 2024 15:15:45 +0800 Message-Id: <20240815071545.925867-3-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240815071545.925867-1-maobibo@loongson.cn> References: <20240815071545.925867-1-maobibo@loongson.cn> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: qMiowMDxG2chq71mlesUAA--.1465S4 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== If paravirt steal time feature is enabled, there is percpu gpa address passed from guest vcpu and host modified guest memory space with this gpa address. When vcpu is reset normally, it will notify host and invalidate gpa address. However if VM is crashed and VMM reboots VM forcely, vcpu reboot notification callback will not be called in VM, host needs invalid the gpa address, else host will modify guest memory during VM reboots. Here it is invalidated from vCPU KVM_REG_LOONGARCH_VCPU_RESET ioctl interface. Also funciton kvm_reset_timer() is removed at vCPU reset stage, since SW emulated timer is only used in vCPU block state. When vCPU is removed from block waiting queue, kvm_restore_timer() is called and SW timer is cancelled. And timer register is cleared at VMM when vCPU is reset. Signed-off-by: Bibo Mao --- arch/loongarch/include/asm/kvm_vcpu.h | 1 - arch/loongarch/kvm/timer.c | 7 ------- arch/loongarch/kvm/vcpu.c | 2 +- 3 files changed, 1 insertion(+), 9 deletions(-) diff --git a/arch/loongarch/include/asm/kvm_vcpu.h b/arch/loongarch/include/asm/kvm_vcpu.h index c416cb7125c0..86570084e05a 100644 --- a/arch/loongarch/include/asm/kvm_vcpu.h +++ b/arch/loongarch/include/asm/kvm_vcpu.h @@ -76,7 +76,6 @@ static inline void kvm_restore_lasx(struct loongarch_fpu *fpu) { } #endif void kvm_init_timer(struct kvm_vcpu *vcpu, unsigned long hz); -void kvm_reset_timer(struct kvm_vcpu *vcpu); void kvm_save_timer(struct kvm_vcpu *vcpu); void kvm_restore_timer(struct kvm_vcpu *vcpu); diff --git a/arch/loongarch/kvm/timer.c b/arch/loongarch/kvm/timer.c index bcc6b6d063d9..74a4b5c272d6 100644 --- a/arch/loongarch/kvm/timer.c +++ b/arch/loongarch/kvm/timer.c @@ -188,10 +188,3 @@ void kvm_save_timer(struct kvm_vcpu *vcpu) kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ESTAT); preempt_enable(); } - -void kvm_reset_timer(struct kvm_vcpu *vcpu) -{ - write_gcsr_timercfg(0); - kvm_write_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_TCFG, 0); - hrtimer_cancel(&vcpu->arch.swtimer); -} diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 16756ffb55e8..6905283f535b 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -647,7 +647,7 @@ static int kvm_set_one_reg(struct kvm_vcpu *vcpu, vcpu->kvm->arch.time_offset = (signed long)(v - drdtime()); break; case KVM_REG_LOONGARCH_VCPU_RESET: - kvm_reset_timer(vcpu); + vcpu->arch.st.guest_addr = 0; memset(&vcpu->arch.irq_pending, 0, sizeof(vcpu->arch.irq_pending)); memset(&vcpu->arch.irq_clear, 0, sizeof(vcpu->arch.irq_clear)); break;