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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=TDI4PXumIZgxBePNd+ivE0VBcCC0VeGNDBRFqyds1eM=; b=NFXKSE1A9WyATGna6I4J8ZtmQHef2NiMzsJyAuTKidFy5e11/6PSD40hmoHI293QbK TcyK/9vBWQqNyJ4JyFmOEPVpGNz1hDCrzpwRsFjffIdHWBenupEACjo9uYWIOIHelH+S nnJbg5jCGItedIR9S5JFNquxISDMyO8iWnuRX3kLacu4RwLcfvAI7XSoPFJEm0Ba+GSU m0qN+ZDZG1VxiEof+gdiYi081awFvK5fLlirQuGND8YEWUlEtmbvrFPSd8hakbM2A+Vs ONUM2NjzmW9q5p5NljIAF3CBOGGAJbWgLJpVD8iNcW8A4hLY79We3E5rX+IYb9w4BnHN BKdg== X-Gm-Message-State: AOAM53101X46OeU2MBrv8EDhqq6yCe7XZTsO+xPELCFCnfuhJncLMhfn MAdNFK2qIhE8YPOIL7zQHAk= X-Google-Smtp-Source: ABdhPJw6VTPU9WI3kHLEFrQaIMTpdWgtR9lc2XZhC9GhjxtOkcyL5lpx/QGe3K50jPAfDu6vcR2b5Q== X-Received: by 2002:a17:90a:80c5:: with SMTP id k5mr6957940pjw.129.1622387200366; Sun, 30 May 2021 08:06:40 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, rppt@kernel.org, hannes@cmpxchg.org, cai@lca.pw, krish.sadhukhan@oracle.com, saravanand@fb.com, Tianyu.Lan@microsoft.com, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, xen-devel@lists.xenproject.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com Subject: [RFC PATCH V3 02/11] x86/HV: Initialize shared memory boundary in the Isolation VM. Date: Sun, 30 May 2021 11:06:19 -0400 Message-Id: <20210530150628.2063957-3-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210530150628.2063957-1-ltykernel@gmail.com> References: <20210530150628.2063957-1-ltykernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tianyu Lan Hyper-V also exposes shared memory boundary via cpuid HYPERV_CPUID_ISOLATION_CONFIG and store it in the shared_gpa_boundary of ms_hyperv struct. This prepares to share memory with host for SNP guest. Signed-off-by: Tianyu Lan --- arch/x86/kernel/cpu/mshyperv.c | 2 ++ include/asm-generic/mshyperv.h | 12 +++++++++++- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 22f13343b5da..d1ca36224657 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -320,6 +320,8 @@ static void __init ms_hyperv_init_platform(void) if (ms_hyperv.priv_high & HV_ISOLATION) { ms_hyperv.isolation_config_a = cpuid_eax(HYPERV_CPUID_ISOLATION_CONFIG); ms_hyperv.isolation_config_b = cpuid_ebx(HYPERV_CPUID_ISOLATION_CONFIG); + ms_hyperv.shared_gpa_boundary = + (u64)1 << ms_hyperv.shared_gpa_boundary_bits; pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n", ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 3ae56a29594f..2914e27b0429 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -34,8 +34,18 @@ struct ms_hyperv_info { u32 max_vp_index; u32 max_lp_index; u32 isolation_config_a; - u32 isolation_config_b; + union { + u32 isolation_config_b; + struct { + u32 cvm_type : 4; + u32 Reserved11 : 1; + u32 shared_gpa_boundary_active : 1; + u32 shared_gpa_boundary_bits : 6; + u32 Reserved12 : 20; + }; + }; void __percpu **ghcb_base; + u64 shared_gpa_boundary; }; extern struct ms_hyperv_info ms_hyperv; -- 2.25.1