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([2404:f801:9000:1a:efea::4b1]) by smtp.gmail.com with ESMTPSA id h12sm3035510pgn.54.2021.06.10.07.13.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Jun 2021 07:13:46 -0700 (PDT) Subject: Re: [RFC PATCH V3 01/11] x86/HV: Initialize GHCB page in Isolation VM To: Joerg Roedel Cc: 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, will@kernel.org, xen-devel@lists.xenproject.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, 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 References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-2-ltykernel@gmail.com> From: Tianyu Lan Message-ID: Date: Thu, 10 Jun 2021 22:13:32 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org Hi Joerg： Thanks for your review. On 6/9/2021 8:38 PM, Joerg Roedel wrote: > On Sun, May 30, 2021 at 11:06:18AM -0400, Tianyu Lan wrote: >> From: Tianyu Lan >> >> Hyper-V exposes GHCB page via SEV ES GHCB MSR for SNP guest >> to communicate with hypervisor. Map GHCB page for all >> cpus to read/write MSR register and submit hvcall request >> via GHCB. >> >> Signed-off-by: Tianyu Lan >> --- >> arch/x86/hyperv/hv_init.c | 60 ++++++++++++++++++++++++++++++--- >> arch/x86/include/asm/mshyperv.h | 2 ++ >> include/asm-generic/mshyperv.h | 2 ++ >> 3 files changed, 60 insertions(+), 4 deletions(-) >> >> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c >> index bb0ae4b5c00f..dc74d01cb859 100644 >> --- a/arch/x86/hyperv/hv_init.c >> +++ b/arch/x86/hyperv/hv_init.c >> @@ -60,6 +60,9 @@ static int hv_cpu_init(unsigned int cpu) >> struct hv_vp_assist_page **hvp = &hv_vp_assist_page[smp_processor_id()]; >> void **input_arg; >> struct page *pg; >> + u64 ghcb_gpa; >> + void *ghcb_va; >> + void **ghcb_base; > > Any reason you can't reuse the SEV-ES support code in the Linux kernel? > It already has code to setup GHCBs for all vCPUs. > > I see that you don't need #VC handling in your SNP VMs because of the > paravisor running underneath it, but just re-using the GHCB setup code > shouldn't be too hard. > Thanks for your suggestion. I will have a try to use SEV-ES code.