From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6F16F68B88 for ; Tue, 5 Dec 2023 18:11:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ventanamicro.com header.i=@ventanamicro.com header.b="XTdCkNL4" Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id CAA1E43591 for ; Tue, 5 Dec 2023 18:11:37 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org CAA1E43591 Authentication-Results: smtp2.osuosl.org; dkim=pass (2048-bit key) header.d=ventanamicro.com header.i=@ventanamicro.com header.a=rsa-sha256 header.s=google header.b=XTdCkNL4 X-Virus-Scanned: amavisd-new at osuosl.org X-Spam-Flag: NO X-Spam-Score: -2.1 X-Spam-Level: Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xJvrvXAXs2sM for ; Tue, 5 Dec 2023 18:11:36 +0000 (UTC) Received: from mail-ed1-x52f.google.com (mail-ed1-x52f.google.com [IPv6:2a00:1450:4864:20::52f]) by smtp2.osuosl.org (Postfix) with ESMTPS id 94140400D0 for ; Tue, 5 Dec 2023 18:11:36 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 94140400D0 Received: by mail-ed1-x52f.google.com with SMTP id 4fb4d7f45d1cf-54ca339ae7aso3921667a12.3 for ; Tue, 05 Dec 2023 10:11:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1701799895; x=1702404695; darn=lists.linux-foundation.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=7ivOuqr+FRV10zZI63T6X0mHp+G+0XGejIucx0BbhjU=; b=XTdCkNL4QipksZBed3POWEVU3/jf0ZkUuYbGsFtvhur53mXsBDsb6pDKS2CbgWxAvI Pf8Z9eQZ+J1Ucz1zzZp7lUhuPLDI4ja2K5x6TZ+U+xdQXJxptEBeRmIkH1C0Wt5kpitb RrvFj6cjkH9GWPJoRe2KAH3Wl8d7UWdMK+qS5cYgC1mIriZUZSpoNj5mTP7dGXPsYLoi HmVTPOfmtBKePbLoFsd2uZX8XjC2BGTEaAcqqXU0smJladRTIJSQNwXTg2FTfgTdsIFV Z7fxxBRmQKVWe5sUs+5bI+CuTY6gV/ZUNoZXFjrGKzN5rJ9bEDYe1MT4G2yzEKkYLder nsOg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701799895; x=1702404695; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=7ivOuqr+FRV10zZI63T6X0mHp+G+0XGejIucx0BbhjU=; b=PM2faS2aOS5FuWx6xKUZSQZKpat5IQG9dI5zHit+sTr5A1YXil6dqmm3kHU1SIjqHO s73QqBvPUn9aGc+qiscNI/0EWeFKgsRQuONCQ0MnywwgRaXhx7jm73wySafPTF//k/Uv DkL0yNISHeyI7GEQGa2MczU+8egYlGIANEviM3BvNeWuGl1q0yzzJilUQefrLhOnlN67 qwW1NIXRaYdtL7IpeWoMCja8LEIGeCL+2tWV0RRZo9CtkotHy1jgnnIvCYzO6vf+RXZZ LBKGgCc5pSYvTqUt4kUNUWt+VSm5TSbleIXeq3VwIuTHO09yJFknbbO43i4lDuLf7WIu vHUQ== X-Gm-Message-State: AOJu0Yx3gSBgIjPSpq6Jy9PSrQcLLr0vid+RJAkUROtZSGS1i91+464X tJC1bUGEzgFjHWDALbcVkwnJDg== X-Google-Smtp-Source: AGHT+IFtcdRDElDGQo9iA1Q5Jph8SaZn5M3BJzpb1sazlFsO3tnE85b6UjcLN5+isUqYw6gU1SW50g== X-Received: by 2002:a50:d74c:0:b0:54c:8f76:cdb9 with SMTP id i12-20020a50d74c000000b0054c8f76cdb9mr3495992edj.32.1701799894729; Tue, 05 Dec 2023 10:11:34 -0800 (PST) Received: from localhost (2001-1ae9-1c2-4c00-20f-c6b4-1e57-7965.ip6.tmcz.cz. [2001:1ae9:1c2:4c00:20f:c6b4:1e57:7965]) by smtp.gmail.com with ESMTPSA id bf17-20020a0564021a5100b0054ca1d90410sm1403899edb.85.2023.12.05.10.11.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Dec 2023 10:11:34 -0800 (PST) From: Andrew Jones To: kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, virtualization@lists.linux-foundation.org Cc: anup@brainfault.org, atishp@atishpatra.org, pbonzini@redhat.com, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, jgross@suse.com, srivatsa@csail.mit.edu, guoren@kernel.org Subject: [PATCH v1 10/14] RISC-V: KVM: Implement SBI STA extension Date: Tue, 5 Dec 2023 19:11:30 +0100 Message-ID: <20231205181119.207204-26-ajones@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231205181119.207204-16-ajones@ventanamicro.com> References: <20231205181119.207204-16-ajones@ventanamicro.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit Add a select SCHED_INFO to the KVM config in order to get run_delay info. Then implement SBI STA's set-steal-time-shmem function and kvm_riscv_vcpu_record_steal_time() to provide the steal-time info to guests. Signed-off-by: Andrew Jones --- arch/riscv/kvm/Kconfig | 1 + arch/riscv/kvm/vcpu_sbi_sta.c | 96 ++++++++++++++++++++++++++++++++++- 2 files changed, 95 insertions(+), 2 deletions(-) diff --git a/arch/riscv/kvm/Kconfig b/arch/riscv/kvm/Kconfig index dfc237d7875b..148e52b516cf 100644 --- a/arch/riscv/kvm/Kconfig +++ b/arch/riscv/kvm/Kconfig @@ -32,6 +32,7 @@ config KVM select KVM_XFER_TO_GUEST_WORK select MMU_NOTIFIER select PREEMPT_NOTIFIERS + select SCHED_INFO help Support hosting virtualized guest machines. diff --git a/arch/riscv/kvm/vcpu_sbi_sta.c b/arch/riscv/kvm/vcpu_sbi_sta.c index 073bc47013b7..8b8dbee5500a 100644 --- a/arch/riscv/kvm/vcpu_sbi_sta.c +++ b/arch/riscv/kvm/vcpu_sbi_sta.c @@ -6,21 +6,113 @@ #include #include #include +#include +#include +#include +#include #include +#include #include +#include void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu) { gpa_t shmem = vcpu->arch.sta.shmem; + u64 last_steal = vcpu->arch.sta.last_steal; + u32 *sequence_ptr, sequence; + u64 *steal_ptr, steal; + unsigned long hva; + gfn_t gfn; if (shmem == INVALID_GPA) return; + + /* + * shmem is 64-byte aligned (see the enforcement in + * kvm_sbi_sta_steal_time_set_shmem()) and the size of sbi_sta_struct + * is 64 bytes, so we know all its offsets are in the same page. + */ + gfn = shmem >> PAGE_SHIFT; + hva = kvm_vcpu_gfn_to_hva(vcpu, gfn); + + if (WARN_ON(kvm_is_error_hva(hva))) { + vcpu->arch.sta.shmem = INVALID_GPA; + return; + } + + sequence_ptr = (u32 *)(hva + offset_in_page(shmem) + + offsetof(struct sbi_sta_struct, sequence)); + steal_ptr = (u64 *)(hva + offset_in_page(shmem) + + offsetof(struct sbi_sta_struct, steal)); + + if (WARN_ON(get_user(sequence, sequence_ptr))) + return; + + sequence = le32_to_cpu(sequence); + sequence += 1; + + if (WARN_ON(put_user(cpu_to_le32(sequence), sequence_ptr))) + return; + + if (!WARN_ON(get_user(steal, steal_ptr))) { + steal = le64_to_cpu(steal); + vcpu->arch.sta.last_steal = READ_ONCE(current->sched_info.run_delay); + steal += vcpu->arch.sta.last_steal - last_steal; + WARN_ON(put_user(cpu_to_le64(steal), steal_ptr)); + } + + sequence += 1; + WARN_ON(put_user(cpu_to_le32(sequence), sequence_ptr)); + + kvm_vcpu_mark_page_dirty(vcpu, gfn); } static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu) { - return SBI_ERR_FAILURE; + struct kvm_cpu_context *cp = &vcpu->arch.guest_context; + unsigned long shmem_phys_lo = cp->a0; + unsigned long shmem_phys_hi = cp->a1; + u32 flags = cp->a2; + struct sbi_sta_struct zero_sta = {0}; + unsigned long hva; + bool writable; + gpa_t shmem; + int ret; + + if (flags != 0) + return SBI_ERR_INVALID_PARAM; + + if (shmem_phys_lo == SBI_STA_SHMEM_DISABLE && + shmem_phys_hi == SBI_STA_SHMEM_DISABLE) { + vcpu->arch.sta.shmem = INVALID_GPA; + return 0; + } + + if (shmem_phys_lo & (SZ_64 - 1)) + return SBI_ERR_INVALID_PARAM; + + shmem = shmem_phys_lo; + + if (shmem_phys_hi != 0) { + if (IS_ENABLED(CONFIG_32BIT)) + shmem |= ((gpa_t)shmem_phys_hi << 32); + else + return SBI_ERR_INVALID_ADDRESS; + } + + hva = kvm_vcpu_gfn_to_hva_prot(vcpu, shmem >> PAGE_SHIFT, &writable); + if (kvm_is_error_hva(hva) || !writable) + return SBI_ERR_INVALID_ADDRESS; + + ret = kvm_vcpu_write_guest(vcpu, shmem, &zero_sta, sizeof(zero_sta)); + if (ret) + return SBI_ERR_FAILURE; + + vcpu->arch.sta.shmem = shmem; + vcpu->arch.sta.last_steal = current->sched_info.run_delay; + + return 0; } static int kvm_sbi_ext_sta_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, @@ -46,7 +138,7 @@ static int kvm_sbi_ext_sta_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, static unsigned long kvm_sbi_ext_sta_probe(struct kvm_vcpu *vcpu) { - return 0; + return !!sched_info_on(); } const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta = { -- 2.43.0