The following commit has been merged into the objtool/core branch of tip: Commit-ID: 80de642654653a8f86b34e9072a4d2fb95c32683 Gitweb: https://git.kernel.org/tip/80de642654653a8f86b34e9072a4d2fb95c32683 Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> AuthorDate: Thu, 24 Jun 2021 11:41:14 +02:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Wed, 15 Sep 2021 15:51:48 +02:00 x86/xen: Make write_cr2() noinstr vmlinux.o: warning: objtool: pv_ops[42]: native_write_cr2 vmlinux.o: warning: objtool: pv_ops[42]: xen_write_cr2 vmlinux.o: warning: objtool: exc_nmi()+0x127: call to pv_ops[42]() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Reviewed-by: Juergen Gross <jgross@xxxxxxxx> Link: https://lore.kernel.org/r/20210624095148.563524913@xxxxxxxxxxxxx --- arch/x86/include/asm/paravirt.h | 2 +- arch/x86/kernel/paravirt.c | 7 ++++++- arch/x86/xen/mmu_pv.c | 3 ++- 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index 8878065..be82b52 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -140,7 +140,7 @@ static __always_inline unsigned long read_cr2(void) ALT_NOT(X86_FEATURE_XENPV)); } -static inline void write_cr2(unsigned long x) +static __always_inline void write_cr2(unsigned long x) { PVOP_VCALL1(mmu.write_cr2, x); } diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index ff4ade8..78f08e1 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -243,6 +243,11 @@ static noinstr unsigned long pv_native_read_cr2(void) return native_read_cr2(); } +static noinstr void pv_native_write_cr2(unsigned long val) +{ + native_write_cr2(val); +} + struct paravirt_patch_template pv_ops = { /* Cpu ops. */ .cpu.io_delay = native_io_delay, @@ -304,7 +309,7 @@ struct paravirt_patch_template pv_ops = { #ifdef CONFIG_PARAVIRT_XXL .mmu.read_cr2 = __PV_IS_CALLEE_SAVE(pv_native_read_cr2), - .mmu.write_cr2 = native_write_cr2, + .mmu.write_cr2 = pv_native_write_cr2, .mmu.read_cr3 = __native_read_cr3, .mmu.write_cr3 = native_write_cr3, diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c index 1df5f01..f3cafe5 100644 --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -1204,7 +1204,8 @@ static void __init xen_pagetable_init(void) xen_remap_memory(); xen_setup_mfn_list_list(); } -static void xen_write_cr2(unsigned long cr2) + +static noinstr void xen_write_cr2(unsigned long cr2) { this_cpu_read(xen_vcpu)->arch.cr2 = cr2; }
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