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Wed, 14 Apr 2021 07:50:25 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:35:ebad:12c1:f579:e332]) by smtp.gmail.com with ESMTPSA id w67sm17732522pgb.87.2021.04.14.07.50.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Apr 2021 07:50:25 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, akpm@linux-foundation.org, gregkh@linuxfoundation.org, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com Cc: Tianyu Lan , iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.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: [Resend RFC PATCH V2 01/12] x86/HV: Initialize GHCB page in Isolation VM Date: Wed, 14 Apr 2021 10:49:34 -0400 Message-Id: <20210414144945.3460554-2-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210414144945.3460554-1-ltykernel@gmail.com> References: <20210414144945.3460554-1-ltykernel@gmail.com> MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 1C1A2600011E X-Stat-Signature: mwkac1pbk3kaewmq4kwbbsykxtasak3z Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf09; identity=mailfrom; envelope-from=""; helo=mail-pl1-f180.google.com; client-ip=209.85.214.180 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618411822-399968 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 | 52 +++++++++++++++++++++++++++++++--- include/asm-generic/mshyperv.h | 1 + 2 files changed, 49 insertions(+), 4 deletions(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 0db5137d5b81..90e65fbf4c58 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -82,6 +82,9 @@ static int hv_cpu_init(unsigned int cpu) struct hv_vp_assist_page **hvp =3D &hv_vp_assist_page[smp_processor_id(= )]; void **input_arg; struct page *pg; + u64 ghcb_gpa; + void *ghcb_va; + void **ghcb_base; =20 /* hv_cpu_init() can be called with IRQs disabled from hv_resume() */ pg =3D alloc_pages(irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL, hv_root_p= artition ? 1 : 0); @@ -128,6 +131,17 @@ static int hv_cpu_init(unsigned int cpu) wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, val); } =20 + if (ms_hyperv.ghcb_base) { + rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa); + + ghcb_va =3D ioremap_cache(ghcb_gpa, HV_HYP_PAGE_SIZE); + if (!ghcb_va) + return -ENOMEM; + + ghcb_base =3D (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + *ghcb_base =3D ghcb_va; + } + return 0; } =20 @@ -223,6 +237,7 @@ static int hv_cpu_die(unsigned int cpu) unsigned long flags; void **input_arg; void *pg; + void **ghcb_va =3D NULL; =20 local_irq_save(flags); input_arg =3D (void **)this_cpu_ptr(hyperv_pcpu_input_arg); @@ -236,6 +251,13 @@ static int hv_cpu_die(unsigned int cpu) *output_arg =3D NULL; } =20 + if (ms_hyperv.ghcb_base) { + ghcb_va =3D (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + if (*ghcb_va) + iounmap(*ghcb_va); + *ghcb_va =3D NULL; + } + local_irq_restore(flags); =20 free_pages((unsigned long)pg, hv_root_partition ? 1 : 0); @@ -372,6 +394,9 @@ void __init hyperv_init(void) u64 guest_id, required_msrs; union hv_x64_msr_hypercall_contents hypercall_msr; int cpuhp, i; + u64 ghcb_gpa; + void *ghcb_va; + void **ghcb_base; =20 if (x86_hyper_type !=3D X86_HYPER_MS_HYPERV) return; @@ -432,9 +457,24 @@ void __init hyperv_init(void) VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, __builtin_return_address(0)); - if (hv_hypercall_pg =3D=3D NULL) { - wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); - goto remove_cpuhp_state; + if (hv_hypercall_pg =3D=3D NULL) + goto clean_guest_os_id; + + if (hv_isolation_type_snp()) { + ms_hyperv.ghcb_base =3D alloc_percpu(void *); + if (!ms_hyperv.ghcb_base) + goto clean_guest_os_id; + + rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa); + ghcb_va =3D ioremap_cache(ghcb_gpa, HV_HYP_PAGE_SIZE); + if (!ghcb_va) { + free_percpu(ms_hyperv.ghcb_base); + ms_hyperv.ghcb_base =3D NULL; + goto clean_guest_os_id; + } + + ghcb_base =3D (void **)this_cpu_ptr(ms_hyperv.ghcb_base); + *ghcb_base =3D ghcb_va; } =20 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); @@ -499,7 +539,8 @@ void __init hyperv_init(void) =20 return; =20 -remove_cpuhp_state: +clean_guest_os_id: + wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); cpuhp_remove_state(cpuhp); free_vp_assist_page: kfree(hv_vp_assist_page); @@ -528,6 +569,9 @@ void hyperv_cleanup(void) */ hv_hypercall_pg =3D NULL; =20 + if (ms_hyperv.ghcb_base) + free_percpu(ms_hyperv.ghcb_base); + /* Reset the hypercall page */ hypercall_msr.as_uint64 =3D 0; wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyper= v.h index dff58a3db5d5..c6f4c5c20fb8 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -35,6 +35,7 @@ struct ms_hyperv_info { u32 max_lp_index; u32 isolation_config_a; u32 isolation_config_b; + void __percpu **ghcb_base; }; extern struct ms_hyperv_info ms_hyperv; =20 --=20 2.25.1