The following commit has been merged into the sched/core branch of tip: Commit-ID: c3982c1a36f70bd4521a9852246ea50105912084 Gitweb: https://git.kernel.org/tip/c3982c1a36f70bd4521a9852246ea50105912084 Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> AuthorDate: Thu, 12 Jan 2023 20:43:43 +01:00 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitterDate: Fri, 13 Jan 2023 11:48:16 +01:00 cpuidle, tdx: Make TDX code noinstr clean objtool found a few cases where this code called out into instrumented code: vmlinux.o: warning: objtool: __halt+0x2c: call to hcall_func.constprop.0() leaves .noinstr.text section vmlinux.o: warning: objtool: __halt+0x3f: call to __tdx_hypercall() leaves .noinstr.text section vmlinux.o: warning: objtool: __tdx_hypercall+0x66: call to __tdx_hypercall_failed() leaves .noinstr.text section Fix it by: - moving TDX tdcall assembly methods into .noinstr.text (they are already noistr-clean) - marking __tdx_hypercall_failed() as 'noinstr' - annotating hcall_func() as __always_inline Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Tested-by: Tony Lindgren <tony@xxxxxxxxxxx> Tested-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Acked-by: Frederic Weisbecker <frederic@xxxxxxxxxx> Link: https://lore.kernel.org/r/20230112195541.111485720@xxxxxxxxxxxxx --- arch/x86/boot/compressed/vmlinux.lds.S | 1 + arch/x86/coco/tdx/tdcall.S | 2 ++ arch/x86/coco/tdx/tdx.c | 5 +++-- 3 files changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S index 112b237..b22f34b 100644 --- a/arch/x86/boot/compressed/vmlinux.lds.S +++ b/arch/x86/boot/compressed/vmlinux.lds.S @@ -34,6 +34,7 @@ SECTIONS _text = .; /* Text */ *(.text) *(.text.*) + *(.noinstr.text) _etext = . ; } .rodata : { diff --git a/arch/x86/coco/tdx/tdcall.S b/arch/x86/coco/tdx/tdcall.S index 508c173..ad0d51f 100644 --- a/arch/x86/coco/tdx/tdcall.S +++ b/arch/x86/coco/tdx/tdcall.S @@ -31,6 +31,8 @@ TDX_R12 | TDX_R13 | \ TDX_R14 | TDX_R15 ) +.section .noinstr.text, "ax" + /* * __tdx_module_call() - Used by TDX guests to request services from * the TDX module (does not include VMM services) using TDCALL instruction. diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c index 8804174..70e8015 100644 --- a/arch/x86/coco/tdx/tdx.c +++ b/arch/x86/coco/tdx/tdx.c @@ -64,8 +64,9 @@ static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15) } /* Called from __tdx_hypercall() for unrecoverable failure */ -void __tdx_hypercall_failed(void) +noinstr void __tdx_hypercall_failed(void) { + instrumentation_begin(); panic("TDVMCALL failed. TDX module bug?"); } @@ -75,7 +76,7 @@ void __tdx_hypercall_failed(void) * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and * guest sides of these calls. */ -static u64 hcall_func(u64 exit_reason) +static __always_inline u64 hcall_func(u64 exit_reason) { return exit_reason; }
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