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([172.25.112.68]) by fmsmga006.fm.intel.com with ESMTP; 01 Mar 2023 21:50:51 -0800 From: Xin Li To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, andrew.cooper3@citrix.com, seanjc@google.com, pbonzini@redhat.com, ravi.v.shankar@intel.com Subject: [PATCH v4 28/34] x86/fred: fixup fault on ERETU by jumping to fred_entrypoint_user Date: Wed, 1 Mar 2023 21:25:05 -0800 Message-Id: <20230302052511.1918-29-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230302052511.1918-1-xin3.li@intel.com> References: <20230302052511.1918-1-xin3.li@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If the stack frame contains an invalid user context (e.g. due to invalid SS, a non-canonical RIP, etc.) the ERETU instruction will trap (#SS or #GP). From a Linux point of view, this really should be considered a user space failure, so use the standard fault fixup mechanism to intercept the fault, fix up the exception frame, and redirect execution to fred_entrypoint_user. The end result is that it appears just as if the hardware had taken the exception immediately after completing the transition to user space. Suggested-by: H. Peter Anvin (Intel) Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/entry/entry_64_fred.S | 8 +++++-- arch/x86/include/asm/extable_fixup_types.h | 4 +++- arch/x86/mm/extable.c | 28 ++++++++++++++++++++++ 3 files changed, 37 insertions(+), 3 deletions(-) diff --git a/arch/x86/entry/entry_64_fred.S b/arch/x86/entry/entry_64_fred.S index 1fb765fd3871..027ef8f1e600 100644 --- a/arch/x86/entry/entry_64_fred.S +++ b/arch/x86/entry/entry_64_fred.S @@ -5,8 +5,10 @@ * The actual FRED entry points. */ #include -#include +#include #include +#include +#include #include =20 #include "calling.h" @@ -38,7 +40,9 @@ SYM_CODE_START_NOALIGN(fred_entrypoint_user) call fred_entry_from_user SYM_INNER_LABEL(fred_exit_user, SYM_L_GLOBAL) FRED_EXIT - ERETU +1: ERETU + + _ASM_EXTABLE_TYPE(1b, fred_entrypoint_user, EX_TYPE_ERETU) SYM_CODE_END(fred_entrypoint_user) =20 /* diff --git a/arch/x86/include/asm/extable_fixup_types.h b/arch/x86/include/= asm/extable_fixup_types.h index 991e31cfde94..1585c798a02f 100644 --- a/arch/x86/include/asm/extable_fixup_types.h +++ b/arch/x86/include/asm/extable_fixup_types.h @@ -64,6 +64,8 @@ #define EX_TYPE_UCOPY_LEN4 (EX_TYPE_UCOPY_LEN | EX_DATA_IMM(4)) #define EX_TYPE_UCOPY_LEN8 (EX_TYPE_UCOPY_LEN | EX_DATA_IMM(8)) =20 -#define EX_TYPE_ZEROPAD 20 /* longword load with zeropad on fault */ +#define EX_TYPE_ZEROPAD 20 /* longword load with zeropad on fault */ + +#define EX_TYPE_ERETU 21 =20 #endif diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c index 60814e110a54..88a2c419ce8b 100644 --- a/arch/x86/mm/extable.c +++ b/arch/x86/mm/extable.c @@ -6,6 +6,7 @@ #include =20 #include +#include #include #include #include @@ -195,6 +196,29 @@ static bool ex_handler_ucopy_len(const struct exceptio= n_table_entry *fixup, return ex_handler_uaccess(fixup, regs, trapnr); } =20 +#ifdef CONFIG_X86_FRED +static bool ex_handler_eretu(const struct exception_table_entry *fixup, + struct pt_regs *regs, unsigned long error_code) +{ + struct pt_regs *uregs =3D (struct pt_regs *)(regs->sp - offsetof(struct p= t_regs, ip)); + unsigned short ss =3D uregs->ss; + unsigned short cs =3D uregs->cs; + + fred_info(uregs)->edata =3D fred_event_data(regs); + uregs->ssx =3D regs->ssx; + uregs->ss =3D ss; + uregs->csx =3D regs->csx; + uregs->current_stack_level =3D 0; + uregs->cs =3D cs; + + /* Copy error code to uregs and adjust stack pointer accordingly */ + uregs->orig_ax =3D error_code; + regs->sp -=3D 8; + + return ex_handler_default(fixup, regs); +} +#endif + int ex_get_fixup_type(unsigned long ip) { const struct exception_table_entry *e =3D search_exception_tables(ip); @@ -272,6 +296,10 @@ int fixup_exception(struct pt_regs *regs, int trapnr, = unsigned long error_code, return ex_handler_ucopy_len(e, regs, trapnr, reg, imm); case EX_TYPE_ZEROPAD: return ex_handler_zeropad(e, regs, fault_addr); +#ifdef CONFIG_X86_FRED + case EX_TYPE_ERETU: + return ex_handler_eretu(e, regs, error_code); +#endif } BUG(); } --=20 2.34.1