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Wed, 9 Jun 2021 12:49:22 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by smtp2.osuosl.org (Postfix) with ESMTPS id 9B9BD40104 for ; Wed, 9 Jun 2021 12:49:22 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id B439236A; Wed, 9 Jun 2021 14:49:20 +0200 (CEST) Date: Wed, 9 Jun 2021 14:49:19 +0200 From: Joerg Roedel To: Tianyu Lan Subject: Re: [RFC PATCH V3 05/11] HV: Add ghcb hvcall support for SNP VM Message-ID: References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-6-ltykernel@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210530150628.2063957-6-ltykernel@gmail.com> Cc: linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, peterz@infradead.org, dave.hansen@linux.intel.com, hpa@zytor.com, kys@microsoft.com, will@kernel.org, hch@lst.de, linux-arch@vger.kernel.org, wei.liu@kernel.org, sstabellini@kernel.org, sthemmin@microsoft.com, linux-scsi@vger.kernel.org, x86@kernel.org, decui@microsoft.com, mingo@redhat.com, xen-devel@lists.xenproject.org, jejb@linux.ibm.com, jgross@suse.com, Tianyu.Lan@microsoft.com, arnd@arndb.de, konrad.wilk@oracle.com, haiyangz@microsoft.com, kuba@kernel.org, bp@alien8.de, luto@kernel.org, krish.sadhukhan@oracle.com, tglx@linutronix.de, vkuznets@redhat.com, boris.ostrovsky@oracle.com, martin.petersen@oracle.com, saravanand@fb.com, netdev@vger.kernel.org, sunilmut@microsoft.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, kirill.shutemov@linux.intel.com, hannes@cmpxchg.org, cai@lca.pw, akpm@linux-foundation.org, robin.murphy@arm.com, davem@davemloft.net, rppt@kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Sun, May 30, 2021 at 11:06:22AM -0400, Tianyu Lan wrote: > +u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size) > +{ > + union hv_ghcb *hv_ghcb; > + void **ghcb_base; > + unsigned long flags; > + > + if (!ms_hyperv.ghcb_base) > + return -EFAULT; > + > + local_irq_save(flags); > + ghcb_base = (void **)this_cpu_ptr(ms_hyperv.ghcb_base); > + hv_ghcb = (union hv_ghcb *)*ghcb_base; > + if (!hv_ghcb) { > + local_irq_restore(flags); > + return -EFAULT; > + } > + > + memset(hv_ghcb, 0x00, HV_HYP_PAGE_SIZE); > + hv_ghcb->ghcb.protocol_version = 1; > + hv_ghcb->ghcb.ghcb_usage = 1; > + > + hv_ghcb->hypercall.outputgpa = (u64)output; > + hv_ghcb->hypercall.hypercallinput.asuint64 = 0; > + hv_ghcb->hypercall.hypercallinput.callcode = control; > + > + if (input_size) > + memcpy(hv_ghcb->hypercall.hypercalldata, input, input_size); > + > + VMGEXIT(); Also not NMI-safe. When you re-use the existing GHCB setup code from from SEV-ES code, you can also use sev_es_get/put_ghcb() which takes care of re-using a GHCB already in use. Regards, Joerg _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu