From patchwork Wed Nov 9 20:53:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 13038060 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 867DFC433FE for ; Wed, 9 Nov 2022 20:55:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232053AbiKIUzA (ORCPT ); Wed, 9 Nov 2022 15:55:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231927AbiKIUyQ (ORCPT ); Wed, 9 Nov 2022 15:54:16 -0500 Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1441130F71; Wed, 9 Nov 2022 12:54:15 -0800 (PST) Received: by mail-pg1-x52e.google.com with SMTP id 6so9102965pgm.6; Wed, 09 Nov 2022 12:54:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; 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=w0YgLiOl0S0PjO9RGU6dEILmddfdRljq1tR8KTSAHbs=; b=QO4DvPkJIb71Vac+YgbUUc8naxai3q2LPii1mDdSVwgYpblLLIwhA/6QV1KYf15pY/ NEUYzqFaur0JJkEXlRjtQ4KR4E4SqwsdYaV6XcvXtPNCN9AsH3foUs7OeJD8rvNSdp2H 3MKTN62NQdiPSs2fPoNXsvAH6geS/6AjfCFpwuYSPzKWhiKpu0prdr/L4etZOFejb3cD KfHjXpwQsnVYIUjzopLUFAr76G9TxCtb2JqAFo+ThZk5fSwojKTsX3V8N2E1Hibf6QeS A0bm9BNby9qSQJ9seF1ouaDu0eE9glPVhXXZ3DR8upimA9v5vwgTFn+9t7oOdDUE6JpZ gomg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=w0YgLiOl0S0PjO9RGU6dEILmddfdRljq1tR8KTSAHbs=; b=EQK1Baz/b7p13CT6+w88DbulCCOiVIIEaR6No2vxve2+B3oM3DAldtcP2Xd+baKbpx XTg9IsE5uq0uUW2fi7nf9pjOXTsNv758uV72BdiXOmf2SQ9uKR2bFH3b6br9xF8vkYZq lfu8LOufDw7BoezhSLg3azKBVzqBvs8Z5Ah9ps+JPYgNzB6DATSV5lV+VOjLUDXVM8/Y PnLcHgdHI+7uMfknXGPr1RcfUMLdAHPFy2Fy1Gdj48gvmnH307A1l13COCuniX73db+Q 6LjQ3nnNB+LcFAgVZodKCMVH4lON6wzjsT4sJV1P8xNaj6yWoEkHLgE5YCYgYEwlldmy U8Hw== X-Gm-Message-State: ACrzQf3w0m2Rer6OCB2FgHbw5inXKfotl0sw2NY9mDmNb7ObZLb5GJna EoZadd40RxFD57ecX9B5B6U= X-Google-Smtp-Source: AMsMyM60Ruxwb0NOF8P4hL8khXQbh9yWk/7QP60EiXK3zdUhyTP2S4gkYhG405QgLG2mLS60n+JzOA== X-Received: by 2002:a63:de46:0:b0:46e:c3bd:e47d with SMTP id y6-20020a63de46000000b0046ec3bde47dmr52358101pgi.609.1668027254437; Wed, 09 Nov 2022 12:54:14 -0800 (PST) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:a:c616:2003:6c97:8057]) by smtp.gmail.com with ESMTPSA id c2-20020a17090a108200b002137d3da760sm1633984pja.39.2022.11.09.12.54.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Nov 2022 12:54:13 -0800 (PST) From: Tianyu Lan To: luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, seanjc@google.com, pbonzini@redhat.com, jgross@suse.com, tiala@microsoft.com, kirill@shutemov.name, jiangshan.ljs@antgroup.com, peterz@infradead.org, ashish.kalra@amd.com, srutherford@google.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, pawan.kumar.gupta@linux.intel.com, adrian.hunter@intel.com, daniel.sneddon@linux.intel.com, alexander.shishkin@linux.intel.com, sandipan.das@amd.com, ray.huang@amd.com, brijesh.singh@amd.com, michael.roth@amd.com, thomas.lendacky@amd.com, venu.busireddy@oracle.com, sterritt@google.com, tony.luck@intel.com, samitolvanen@google.com, fenghua.yu@intel.com Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org Subject: [RFC PATCH 13/17] x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest Date: Wed, 9 Nov 2022 15:53:48 -0500 Message-Id: <20221109205353.984745-14-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221109205353.984745-1-ltykernel@gmail.com> References: <20221109205353.984745-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Tianyu Lan Read processor amd memory info from specific address which are populated by Hyper-V. Initialize smp cpu related ops, pvalidate system memory and add it into e820 table. Signed-off-by: Tianyu Lan --- arch/x86/kernel/cpu/mshyperv.c | 75 ++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 2ea4f21c6172..f0c97210c64a 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -34,6 +34,12 @@ #include #include #include +#include +#include +#include +#include +#include +#include /* Is Linux running as the root partition? */ bool hv_root_partition; @@ -253,6 +259,33 @@ static void __init hv_smp_prepare_cpus(unsigned int max_cpus) } #endif +static __init int hv_snp_set_rtc_noop(const struct timespec64 *now) { return -EINVAL; } +static __init void hv_snp_get_rtc_noop(struct timespec64 *now) { } + +static u32 processor_count; + +static __init void hv_snp_get_smp_config(unsigned int early) +{ + if (!early) { + while (num_processors < processor_count) { + early_per_cpu(x86_cpu_to_apicid, num_processors) = num_processors; + early_per_cpu(x86_bios_cpu_apicid, num_processors) = num_processors; + physid_set(num_processors, phys_cpu_present_map); + set_cpu_possible(num_processors, true); + set_cpu_present(num_processors, true); + num_processors++; + } + } +} + +struct memory_map_entry { + u64 starting_gpn; + u64 numpages; + u16 type; + u16 flags; + u32 reserved; +}; + static void __init ms_hyperv_init_platform(void) { int hv_max_functions_eax; @@ -260,6 +293,11 @@ static void __init ms_hyperv_init_platform(void) int hv_host_info_ebx; int hv_host_info_ecx; int hv_host_info_edx; + struct memory_map_entry *entry; + struct e820_entry *e820_entry; + u64 e820_end; + u64 ram_end; + u64 page; #ifdef CONFIG_PARAVIRT pv_info.name = "Hyper-V"; @@ -477,6 +515,43 @@ static void __init ms_hyperv_init_platform(void) if (!(ms_hyperv.features & HV_ACCESS_TSC_INVARIANT)) mark_tsc_unstable("running on Hyper-V"); + if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) { + x86_platform.legacy.reserve_bios_regions = 0; + x86_platform.set_wallclock = hv_snp_set_rtc_noop; + x86_platform.get_wallclock = hv_snp_get_rtc_noop; + x86_init.resources.probe_roms = x86_init_noop; + x86_init.resources.reserve_resources = x86_init_noop; + x86_init.mpparse.find_smp_config = x86_init_noop; + x86_init.mpparse.get_smp_config = hv_snp_get_smp_config; + + /* + * Hyper-V SEV-SNP enlightened guest doesn't support ioapic + * and legacy APIC page read/write. Switch to hv apic here. + */ + disable_ioapic_support(); + hv_apic_init(); + + processor_count = *(u32 *)__va(EN_SEV_SNP_PROCESSOR_INFO_ADDR); + + entry = (struct memory_map_entry *)(__va(EN_SEV_SNP_PROCESSOR_INFO_ADDR) + + sizeof(struct memory_map_entry)); + + for (; entry->numpages != 0; entry++) { + e820_entry = &e820_table->entries[e820_table->nr_entries - 1]; + e820_end = e820_entry->addr + e820_entry->size; + ram_end = (entry->starting_gpn + entry->numpages) * PAGE_SIZE; + + if (e820_end < entry->starting_gpn * PAGE_SIZE) + e820_end = entry->starting_gpn * PAGE_SIZE; + if (e820_end < ram_end) { + pr_info("Hyper-V: add [mem %#018Lx-%#018Lx]\n", e820_end, ram_end - 1); + e820__range_add(e820_end, ram_end - e820_end, E820_TYPE_RAM); + for (page = e820_end; page < ram_end; page += PAGE_SIZE) + pvalidate((unsigned long)__va(page), RMP_PG_SIZE_4K, true); + } + } + } + hardlockup_detector_disable(); }