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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2021-09-28 10:40:58 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-09-30 14:50:20 +0200 |
| commit | dfce81f1b931352af0fcfe966c115a09646bd15a (patch) | |
| tree | 734da8b1e65cb0a6884b09a132d3e921922f66a6 /qemu-options.hx | |
| parent | 80509c5557a152f876aec524e8136f309583b2cd (diff) | |
| download | qemu-dfce81f1b931352af0fcfe966c115a09646bd15a.zip qemu-dfce81f1b931352af0fcfe966c115a09646bd15a.tar.gz qemu-dfce81f1b931352af0fcfe966c115a09646bd15a.tar.bz2 | |
vl: Add sgx compound properties to expose SGX EPC sections to guest
Because SGX EPC is enumerated through CPUID, EPC "devices" need to be
realized prior to realizing the vCPUs themselves, i.e. long before
generic devices are parsed and realized. From a virtualization
perspective, the CPUID aspect also means that EPC sections cannot be
hotplugged without paravirtualizing the guest kernel (hardware does
not support hotplugging as EPC sections must be locked down during
pre-boot to provide EPC's security properties).
So even though EPC sections could be realized through the generic
-devices command, they need to be created much earlier for them to
actually be usable by the guest. Place all EPC sections in a
contiguous block, somewhat arbitrarily starting after RAM above 4g.
Ensuring EPC is in a contiguous region simplifies calculations, e.g.
device memory base, PCI hole, etc..., allows dynamic calculation of the
total EPC size, e.g. exposing EPC to guests does not require -maxmem,
and last but not least allows all of EPC to be enumerated in a single
ACPI entry, which is expected by some kernels, e.g. Windows 7 and 8.
The new compound properties command for sgx like below:
......
-object memory-backend-epc,id=mem1,size=28M,prealloc=on \
-object memory-backend-epc,id=mem2,size=10M \
-M sgx-epc.0.memdev=mem1,sgx-epc.1.memdev=mem2
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20210719112136.57018-6-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'qemu-options.hx')
| -rw-r--r-- | qemu-options.hx | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index 8f603cc..ceca528 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -126,8 +126,14 @@ SRST -m 512M ERST -HXCOMM Deprecated by -machine -DEF("M", HAS_ARG, QEMU_OPTION_M, "", QEMU_ARCH_ALL) +DEF("M", HAS_ARG, QEMU_OPTION_M, + " sgx-epc.0.memdev=memid\n", + QEMU_ARCH_ALL) + +SRST +``sgx-epc.0.memdev=@var{memid}`` + Define an SGX EPC section. +ERST DEF("cpu", HAS_ARG, QEMU_OPTION_cpu, "-cpu cpu select CPU ('-cpu help' for list)\n", QEMU_ARCH_ALL) |