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([2404:f801:9000:1a:efea::50b]) by smtp.gmail.com with ESMTPSA id g4sm1018401pjt.56.2021.09.01.23.35.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Sep 2021 23:35:28 -0700 (PDT) Subject: Re: [PATCH V4 02/13] x86/hyperv: Initialize shared memory boundary in the Isolation VM. To: Michael Kelley , KY Srinivasan , Haiyang Zhang , Stephen Hemminger , "wei.liu@kernel.org" , Dexuan Cui , "catalin.marinas@arm.com" , "will@kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "x86@kernel.org" , "hpa@zytor.com" , "dave.hansen@linux.intel.com" , "luto@kernel.org" , "peterz@infradead.org" , "konrad.wilk@oracle.com" , "boris.ostrovsky@oracle.com" , "jgross@suse.com" , "sstabellini@kernel.org" , "joro@8bytes.org" , "davem@davemloft.net" , "kuba@kernel.org" , "jejb@linux.ibm.com" , "martin.petersen@oracle.com" , "gregkh@linuxfoundation.org" , "arnd@arndb.de" , "hch@lst.de" , "m.szyprowski@samsung.com" , "robin.murphy@arm.com" , "brijesh.singh@amd.com" , "thomas.lendacky@amd.com" , Tianyu Lan , "pgonda@google.com" , "martin.b.radev@gmail.com" , "akpm@linux-foundation.org" , "kirill.shutemov@linux.intel.com" , "rppt@kernel.org" , "hannes@cmpxchg.org" , "aneesh.kumar@linux.ibm.com" , "krish.sadhukhan@oracle.com" , "saravanand@fb.com" , "linux-arm-kernel@lists.infradead.org" , "xen-devel@lists.xenproject.org" , "rientjes@google.com" , "ardb@kernel.org" 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 , "parri.andrea@gmail.com" , "dave.hansen@intel.com" References: <20210827172114.414281-1-ltykernel@gmail.com> <20210827172114.414281-3-ltykernel@gmail.com> From: Tianyu Lan Message-ID: <3162bb35-f047-ddbb-3836-6b048b7358e7@gmail.com> Date: Thu, 2 Sep 2021 14:35:12 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org Hi Michael: Thanks for your review. On 9/2/2021 8:15 AM, Michael Kelley wrote: > From: Tianyu Lan Sent: Friday, August 27, 2021 10:21 AM >> >> Hyper-V 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 >> --- >> Change since v3: >> * user BIT_ULL to get shared_gpa_boundary >> * Rename field Reserved* to reserved >> --- >> 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 20557a9d6e25..8bb001198316 100644 >> --- a/arch/x86/kernel/cpu/mshyperv.c >> +++ b/arch/x86/kernel/cpu/mshyperv.c >> @@ -313,6 +313,8 @@ 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 = >> + BIT_ULL(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 0924bbd8458e..7537ae1db828 100644 >> --- a/include/asm-generic/mshyperv.h >> +++ b/include/asm-generic/mshyperv.h >> @@ -35,7 +35,17 @@ 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; > > I'm still curious about the "11" and "12" in the reserved > field names. Why not just "reserved1" and "reserved2"? > Having the "11" and "12" isn't wrong, but it makes one > wonder why since it's not usual. :-) > Yes, will update. Thanks.