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Tue, 14 Jul 2020 07:30:14 +0000 Subject: Re: [PATCH v35 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call To: Jarkko Sakkinen , x86@kernel.org, linux-sgx@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Sean Christopherson , Andy Lutomirski , Cedric Xing , akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com, asapek@google.com, bp@alien8.de, chenalexchen@google.com, conradparker@google.com, cyhanish@google.com, dave.hansen@intel.com, haitao.huang@intel.com, josh@joshtriplett.org, kai.huang@intel.com, kai.svahn@intel.com, kmoy@google.com, ludloff@google.com, luto@kernel.org, nhorman@redhat.com, npmccallum@redhat.com, puiterwijk@redhat.com, rientjes@google.com, tglx@linutronix.de, yaozhangx@google.com References: <20200707033747.142828-1-jarkko.sakkinen@linux.intel.com> <20200707033747.142828-22-jarkko.sakkinen@linux.intel.com> From: Jethro Beekman Message-ID: Date: Tue, 14 Jul 2020 09:30:03 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 In-Reply-To: <20200707033747.142828-22-jarkko.sakkinen@linux.intel.com> Content-Type: multipart/signed; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2020-07-07 05:37, Jarkko Sakkinen wrote: > From: Sean Christopherson >=20 > An SGX runtime must be aware of the exceptions, which happen inside an > enclave. Introduce a vDSO call that wraps EENTER/ERESUME cycle and retu= rns > the CPU exception back to the caller exactly when it happens. >=20 > Kernel fixups the exception information to RDI, RSI and RDX. The SGX ca= ll > vDSO handler fills this information to the user provided buffer or > alternatively trigger user provided callback at the time of the excepti= on. >=20 > The calling convention is custom and does not follow System V x86-64 AB= I. >=20 > Suggested-by: Andy Lutomirski > Acked-by: Jethro Beekman > Tested-by: Jethro Beekman > Signed-off-by: Sean Christopherson > Co-developed-by: Cedric Xing > Signed-off-by: Cedric Xing > Signed-off-by: Jarkko Sakkinen > --- > arch/x86/entry/vdso/Makefile | 2 + > arch/x86/entry/vdso/vdso.lds.S | 1 + > arch/x86/entry/vdso/vsgx_enter_enclave.S | 131 +++++++++++++++++++++++= > arch/x86/include/asm/enclu.h | 8 ++ > arch/x86/include/uapi/asm/sgx.h | 98 +++++++++++++++++ > 5 files changed, 240 insertions(+) > create mode 100644 arch/x86/entry/vdso/vsgx_enter_enclave.S > create mode 100644 arch/x86/include/asm/enclu.h >=20 > diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefil= e > index ebe82b7aecda..f71ad5ebd0c4 100644 > --- a/arch/x86/entry/vdso/Makefile > +++ b/arch/x86/entry/vdso/Makefile > @@ -29,6 +29,7 @@ VDSO32-$(CONFIG_IA32_EMULATION) :=3D y > vobjs-y :=3D vdso-note.o vclock_gettime.o vgetcpu.o > vobjs32-y :=3D vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o > vobjs32-y +=3D vdso32/vclock_gettime.o > +vobjs-$(VDSO64-y) +=3D vsgx_enter_enclave.o > =20 > # files to link into kernel > obj-y +=3D vma.o extable.o > @@ -100,6 +101,7 @@ $(vobjs): KBUILD_CFLAGS :=3D $(filter-out $(GCC_PLU= GINS_CFLAGS) $(RETPOLINE_CFLAGS > CFLAGS_REMOVE_vclock_gettime.o =3D -pg > CFLAGS_REMOVE_vdso32/vclock_gettime.o =3D -pg > CFLAGS_REMOVE_vgetcpu.o =3D -pg > +CFLAGS_REMOVE_vsgx_enter_enclave.o =3D -pg > =20 > # > # X32 processes use x32 vDSO to access 64bit kernel data. > diff --git a/arch/x86/entry/vdso/vdso.lds.S b/arch/x86/entry/vdso/vdso.= lds.S > index 36b644e16272..4bf48462fca7 100644 > --- a/arch/x86/entry/vdso/vdso.lds.S > +++ b/arch/x86/entry/vdso/vdso.lds.S > @@ -27,6 +27,7 @@ VERSION { > __vdso_time; > clock_getres; > __vdso_clock_getres; > + __vdso_sgx_enter_enclave; > local: *; > }; > } > diff --git a/arch/x86/entry/vdso/vsgx_enter_enclave.S b/arch/x86/entry/= vdso/vsgx_enter_enclave.S > new file mode 100644 > index 000000000000..be7e467e1efb > --- /dev/null > +++ b/arch/x86/entry/vdso/vsgx_enter_enclave.S > @@ -0,0 +1,131 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > + > +#include > +#include > +#include > +#include > + > +#include "extable.h" > + > +#define EX_LEAF 0*8 > +#define EX_TRAPNR 0*8+4 > +#define EX_ERROR_CODE 0*8+6 > +#define EX_ADDRESS 1*8 > + > +.code64 > +.section .text, "ax" > + > +SYM_FUNC_START(__vdso_sgx_enter_enclave) > + /* Prolog */ > + .cfi_startproc > + push %rbp > + .cfi_adjust_cfa_offset 8 > + .cfi_rel_offset %rbp, 0 > + mov %rsp, %rbp > + .cfi_def_cfa_register %rbp > + push %rbx > + .cfi_rel_offset %rbx, -8 > + > + mov %ecx, %eax > +.Lenter_enclave: > + /* EENTER <=3D leaf <=3D ERESUME */ > + cmp $EENTER, %eax > + jb .Linvalid_leaf > + cmp $ERESUME, %eax > + ja .Linvalid_leaf > + > + /* Load TCS and AEP */ > + mov 0x10(%rbp), %rbx > + lea .Lasync_exit_pointer(%rip), %rcx > + > + /* Single ENCLU serving as both EENTER and AEP (ERESUME) */ > +.Lasync_exit_pointer: > +.Lenclu_eenter_eresume: > + enclu After thinking about this some more, I'd like to come back to this setup.= Prior discussion at https://lkml.org/lkml/2018/11/2/597 . I hope I'm not= derailing the discussion so much as to delay the patch set :( I previously mentioned =E2=80=9CUserspace may want fine-grained control o= ver enclave scheduling=E2=80=9D as a reason userspace may want to specify= a different AEP, but gave a bad example. Here's a better example: If I'm= running my enclave in an M:N threading model (where M user threads run N= TCSs, with N > M), an AEX is a good oppurtunity to switch contexts. Yes,= I could implement this with alarm() or so, but that adds overhead while = missing out on a lot of opportunities for context switching. -- Jethro Beekman | Fortanix --------------ms040409030902020602070106 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC C54wggVPMIIEN6ADAgECAhAFFr+cC0ZYZTtbKgQCBwyyMA0GCSqGSIb3DQEBCwUAMIGCMQsw CQYDVQQGEwJJVDEPMA0GA1UECAwGTWlsYW5vMQ8wDQYDVQQHDAZNaWxhbm8xIzAhBgNVBAoM GkFjdGFsaXMgUy5wLkEuLzAzMzU4NTIwOTY3MSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBB dXRoZW50aWNhdGlvbiBDQSBHMTAeFw0xOTA5MTYwOTQ3MDlaFw0yMDA5MTYwOTQ3MDlaMB4x HDAaBgNVBAMME2pldGhyb0Bmb3J0YW5peC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw ggEKAoIBAQDHWEhcRGkEl1ZnImSqBt/OXNJ4AyDZ86CejuWI9jYpWbtf/gXBQO6iaaEKBDlj Vffk2QxH9wcifkYsvCYfxFgD15dU9TABO7YOwvHa8NtxanWr1xomufu/P1ApI336+S7ZXfSe 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