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From e8377e3f4d540e2594a50985523e87d1f3cabbc7 Mon Sep 17 00:00:00 2001
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From: Yang Zhong <yang.zhong@intel.com>
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Date: Mon, 1 Nov 2021 12:20:08 -0400
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Subject: [PATCH 3/7] doc: Add the SGX numa description
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RH-Author: Paul Lai <None>
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RH-MergeRequest: 111: numa: Enable numa for SGX EPC sections
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RH-Commit: [3/5] 41c74688c9662b966c243566a837135ff52341c4
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RH-Bugzilla: 1518984
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RH-Acked-by: Paolo Bonzini <None>
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RH-Acked-by: Bandan Das <None>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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Add the SGX numa reference command and how to check if
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SGX numa is support or not with multiple EPC sections.
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Signed-off-by: Yang Zhong <yang.zhong@intel.com>
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Message-Id: <20211101162009.62161-5-yang.zhong@intel.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit d1889b36098c79e2e6ac90faf3d0dc5ec0057677)
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Signed-off-by: Paul Lai <plai@redhat.com>
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---
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docs/system/i386/sgx.rst | 31 +++++++++++++++++++++++++++----
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1 file changed, 27 insertions(+), 4 deletions(-)
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diff --git a/docs/system/i386/sgx.rst b/docs/system/i386/sgx.rst
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index f8fade5ac2..0f0a73f758 100644
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--- a/docs/system/i386/sgx.rst
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+++ b/docs/system/i386/sgx.rst
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@@ -141,8 +141,7 @@ To launch a SGX guest:
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|qemu_system_x86| \\
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-cpu host,+sgx-provisionkey \\
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-object memory-backend-epc,id=mem1,size=64M,prealloc=on \\
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- -object memory-backend-epc,id=mem2,size=28M \\
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- -M sgx-epc.0.memdev=mem1,sgx-epc.1.memdev=mem2
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+ -M sgx-epc.0.memdev=mem1,sgx-epc.0.node=0
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Utilizing SGX in the guest requires a kernel/OS with SGX support.
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The support can be determined in guest by::
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@@ -152,8 +151,32 @@ The support can be determined in guest by::
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and SGX epc info by::
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$ dmesg | grep sgx
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- [ 1.242142] sgx: EPC section 0x180000000-0x181bfffff
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- [ 1.242319] sgx: EPC section 0x181c00000-0x1837fffff
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+ [ 0.182807] sgx: EPC section 0x140000000-0x143ffffff
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+ [ 0.183695] sgx: [Firmware Bug]: Unable to map EPC section to online node. Fallback to the NUMA node 0.
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+
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+To launch a SGX numa guest:
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+
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+.. parsed-literal::
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+
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+ |qemu_system_x86| \\
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+ -cpu host,+sgx-provisionkey \\
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+ -object memory-backend-ram,size=2G,host-nodes=0,policy=bind,id=node0 \\
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+ -object memory-backend-epc,id=mem0,size=64M,prealloc=on,host-nodes=0,policy=bind \\
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+ -numa node,nodeid=0,cpus=0-1,memdev=node0 \\
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+ -object memory-backend-ram,size=2G,host-nodes=1,policy=bind,id=node1 \\
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+ -object memory-backend-epc,id=mem1,size=28M,prealloc=on,host-nodes=1,policy=bind \\
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+ -numa node,nodeid=1,cpus=2-3,memdev=node1 \\
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+ -M sgx-epc.0.memdev=mem0,sgx-epc.0.node=0,sgx-epc.1.memdev=mem1,sgx-epc.1.node=1
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+
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+and SGX epc numa info by::
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+
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+ $ dmesg | grep sgx
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+ [ 0.369937] sgx: EPC section 0x180000000-0x183ffffff
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+ [ 0.370259] sgx: EPC section 0x184000000-0x185bfffff
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+
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+ $ dmesg | grep SRAT
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+ [ 0.009981] ACPI: SRAT: Node 0 PXM 0 [mem 0x180000000-0x183ffffff]
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+ [ 0.009982] ACPI: SRAT: Node 1 PXM 1 [mem 0x184000000-0x185bfffff]
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References
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----------
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--
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2.27.0
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