The following commit has been merged into the x86/alternatives branch of tip: Commit-ID: 054ac8ad5ebe4a69e1f0e842483821ddbe560121 Gitweb: https://git.kernel.org/tip/054ac8ad5ebe4a69e1f0e842483821ddbe560121 Author: Juergen Gross <jgross@xxxxxxxx> AuthorDate: Thu, 11 Mar 2021 15:23:19 +01:00 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Thu, 11 Mar 2021 20:11:09 +01:00 x86/paravirt: Have only one paravirt patch function There is no need any longer to have different paravirt patch functions for native and Xen. Eliminate native_patch() and rename paravirt_patch_default() to paravirt_patch(). Signed-off-by: Juergen Gross <jgross@xxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20210311142319.4723-15-jgross@xxxxxxxx --- arch/x86/include/asm/paravirt_types.h | 19 +------------------ arch/x86/kernel/Makefile | 3 +-- arch/x86/kernel/alternative.c | 2 +- arch/x86/kernel/paravirt.c | 20 ++------------------ arch/x86/kernel/paravirt_patch.c | 11 ----------- arch/x86/xen/enlighten_pv.c | 1 - 6 files changed, 5 insertions(+), 51 deletions(-) delete mode 100644 arch/x86/kernel/paravirt_patch.c diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 588ff14..9d1ddb7 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -68,19 +68,6 @@ struct pv_info { const char *name; }; -struct pv_init_ops { - /* - * Patch may replace one of the defined code sequences with - * arbitrary code, subject to the same register constraints. - * This generally means the code is not free to clobber any - * registers other than EAX. The patch function should return - * the number of bytes of code generated, as we nop pad the - * rest in generic code. - */ - unsigned (*patch)(u8 type, void *insn_buff, - unsigned long addr, unsigned len); -} __no_randomize_layout; - #ifdef CONFIG_PARAVIRT_XXL struct pv_lazy_ops { /* Set deferred update mode, used for batching operations. */ @@ -276,7 +263,6 @@ struct pv_lock_ops { * number for each function using the offset which we use to indicate * what to patch. */ struct paravirt_patch_template { - struct pv_init_ops init; struct pv_cpu_ops cpu; struct pv_irq_ops irq; struct pv_mmu_ops mmu; @@ -317,10 +303,7 @@ extern void (*paravirt_iret)(void); /* Simple instruction patching code. */ #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t" -unsigned paravirt_patch_default(u8 type, void *insn_buff, unsigned long addr, unsigned len); -unsigned paravirt_patch_insns(void *insn_buff, unsigned len, const char *start, const char *end); - -unsigned native_patch(u8 type, void *insn_buff, unsigned long addr, unsigned len); +unsigned int paravirt_patch(u8 type, void *insn_buff, unsigned long addr, unsigned int len); int paravirt_disable_iospace(void); diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 2ddf083..0704c2a 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -35,7 +35,6 @@ KASAN_SANITIZE_sev-es.o := n KCSAN_SANITIZE := n OBJECT_FILES_NON_STANDARD_test_nx.o := y -OBJECT_FILES_NON_STANDARD_paravirt_patch.o := y ifdef CONFIG_FRAME_POINTER OBJECT_FILES_NON_STANDARD_ftrace_$(BITS).o := y @@ -121,7 +120,7 @@ obj-$(CONFIG_AMD_NB) += amd_nb.o obj-$(CONFIG_DEBUG_NMI_SELFTEST) += nmi_selftest.o obj-$(CONFIG_KVM_GUEST) += kvm.o kvmclock.o -obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch.o +obj-$(CONFIG_PARAVIRT) += paravirt.o obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= paravirt-spinlocks.o obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o obj-$(CONFIG_X86_PMEM_LEGACY_DEVICE) += pmem.o diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 76ad4ce..f810e6f 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -616,7 +616,7 @@ void __init_or_module apply_paravirt(struct paravirt_patch_site *start, BUG_ON(p->len > MAX_PATCH_LEN); /* prep the buffer with the original instructions */ memcpy(insn_buff, p->instr, p->len); - used = pv_ops.init.patch(p->type, insn_buff, (unsigned long)p->instr, p->len); + used = paravirt_patch(p->type, insn_buff, (unsigned long)p->instr, p->len); BUG_ON(used > p->len); diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index 855ae08..d073026 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -99,8 +99,8 @@ void __init native_pv_lock_init(void) static_branch_disable(&virt_spin_lock_key); } -unsigned paravirt_patch_default(u8 type, void *insn_buff, - unsigned long addr, unsigned len) +unsigned int paravirt_patch(u8 type, void *insn_buff, unsigned long addr, + unsigned int len) { /* * Neat trick to map patch type back to the call within the @@ -121,19 +121,6 @@ unsigned paravirt_patch_default(u8 type, void *insn_buff, return ret; } -unsigned paravirt_patch_insns(void *insn_buff, unsigned len, - const char *start, const char *end) -{ - unsigned insn_len = end - start; - - /* Alternative instruction is too large for the patch site and we cannot continue: */ - BUG_ON(insn_len > len || start == NULL); - - memcpy(insn_buff, start, insn_len); - - return insn_len; -} - struct static_key paravirt_steal_enabled; struct static_key paravirt_steal_rq_enabled; @@ -252,9 +239,6 @@ struct pv_info pv_info = { #define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64) struct paravirt_patch_template pv_ops = { - /* Init ops. */ - .init.patch = native_patch, - /* Cpu ops. */ .cpu.io_delay = native_io_delay, diff --git a/arch/x86/kernel/paravirt_patch.c b/arch/x86/kernel/paravirt_patch.c deleted file mode 100644 index 10543dc..0000000 --- a/arch/x86/kernel/paravirt_patch.c +++ /dev/null @@ -1,11 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include <linux/stringify.h> - -#include <asm/paravirt.h> -#include <asm/asm-offsets.h> - -unsigned int native_patch(u8 type, void *insn_buff, unsigned long addr, - unsigned int len) -{ - return paravirt_patch_default(type, insn_buff, addr, len); -} diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 08dca7b..4f18cd9 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -1231,7 +1231,6 @@ asmlinkage __visible void __init xen_start_kernel(void) /* Install Xen paravirt ops */ pv_info = xen_info; - pv_ops.init.patch = paravirt_patch_default; pv_ops.cpu = xen_cpu_ops; paravirt_iret = xen_iret; xen_init_irq_ops();
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