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Subject[tip:x86/paravirt] x86/paravirt: Unify the 32/64 bit paravirt patching code
Commit-ID:  fb2af0712fe8831dc152b0b5dd8bc516970da336
Gitweb: https://git.kernel.org/tip/fb2af0712fe8831dc152b0b5dd8bc516970da336
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 24 Apr 2019 15:41:17 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 25 Apr 2019 12:00:44 +0200

x86/paravirt: Unify the 32/64 bit paravirt patching code

Large parts of these two files are identical. Merge them together.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Link: http://lkml.kernel.org/r/20190424134223.603491680@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/Makefile | 4 +-
.../{paravirt_patch_64.c => paravirt_patch.c} | 62 ++++++++++++++++-----
arch/x86/kernel/paravirt_patch_32.c | 64 ----------------------
3 files changed, 50 insertions(+), 80 deletions(-)

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 00b7e27bc2b7..62e78a3fd31e 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -30,7 +30,7 @@ KASAN_SANITIZE_paravirt.o := n

OBJECT_FILES_NON_STANDARD_relocate_kernel_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_test_nx.o := y
-OBJECT_FILES_NON_STANDARD_paravirt_patch_$(BITS).o := y
+OBJECT_FILES_NON_STANDARD_paravirt_patch.o := y

ifdef CONFIG_FRAME_POINTER
OBJECT_FILES_NON_STANDARD_ftrace_$(BITS).o := y
@@ -112,7 +112,7 @@ obj-$(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_$(BITS).o
+obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch.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/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch.c
similarity index 59%
rename from arch/x86/kernel/paravirt_patch_64.c
rename to arch/x86/kernel/paravirt_patch.c
index bd1558f90cfb..a47899db9932 100644
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch.c
@@ -1,9 +1,11 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/stringify.h>
+
#include <asm/paravirt.h>
#include <asm/asm-offsets.h>
-#include <linux/stringify.h>

-#ifdef CONFIG_PARAVIRT_XXL
+#ifdef CONFIG_X86_64
+# ifdef CONFIG_PARAVIRT_XXL
DEF_NATIVE(irq, irq_disable, "cli");
DEF_NATIVE(irq, irq_enable, "sti");
DEF_NATIVE(irq, restore_fl, "pushq %rdi; popfq");
@@ -12,24 +14,49 @@ DEF_NATIVE(mmu, read_cr2, "movq %cr2, %rax");
DEF_NATIVE(mmu, read_cr3, "movq %cr3, %rax");
DEF_NATIVE(mmu, write_cr3, "movq %rdi, %cr3");
DEF_NATIVE(cpu, wbinvd, "wbinvd");
-
DEF_NATIVE(cpu, usergs_sysret64, "swapgs; sysretq");
DEF_NATIVE(cpu, swapgs, "swapgs");
DEF_NATIVE(, mov64, "mov %rdi, %rax");

-unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
+unsigned int paravirt_patch_ident_64(void *insnbuf, unsigned int len)
{
- return paravirt_patch_insns(insnbuf, len,
- start__mov64, end__mov64);
+ return paravirt_patch_insns(insnbuf, len, start__mov64, end__mov64);
}
-#endif
+# endif /* CONFIG_PARAVIRT_XXL */

-#if defined(CONFIG_PARAVIRT_SPINLOCKS)
+# ifdef CONFIG_PARAVIRT_SPINLOCKS
DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%rdi)");
DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");
-#endif
+# endif
+
+#else /* CONFIG_X86_64 */
+
+# ifdef CONFIG_PARAVIRT_XXL
+DEF_NATIVE(irq, irq_disable, "cli");
+DEF_NATIVE(irq, irq_enable, "sti");
+DEF_NATIVE(irq, restore_fl, "push %eax; popf");
+DEF_NATIVE(irq, save_fl, "pushf; pop %eax");
+DEF_NATIVE(cpu, iret, "iret");
+DEF_NATIVE(mmu, read_cr2, "mov %cr2, %eax");
+DEF_NATIVE(mmu, write_cr3, "mov %eax, %cr3");
+DEF_NATIVE(mmu, read_cr3, "mov %cr3, %eax");
+
+unsigned int paravirt_patch_ident_64(void *insnbuf, unsigned int len)
+{
+ /* arg in %edx:%eax, return in %edx:%eax */
+ return 0;
+}
+# endif /* CONFIG_PARAVIRT_XXL */
+
+# ifdef CONFIG_PARAVIRT_SPINLOCKS
+DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%eax)");
+DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");
+# endif
+
+#endif /* !CONFIG_X86_64 */

-unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
+unsigned int native_patch(u8 type, void *ibuf, unsigned long addr,
+ unsigned int len)
{
#define PATCH_SITE(ops, x) \
case PARAVIRT_PATCH(ops.x): \
@@ -41,14 +68,21 @@ unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
PATCH_SITE(irq, save_fl);
PATCH_SITE(irq, irq_enable);
PATCH_SITE(irq, irq_disable);
- PATCH_SITE(cpu, usergs_sysret64);
- PATCH_SITE(cpu, swapgs);
- PATCH_SITE(cpu, wbinvd);
+
PATCH_SITE(mmu, read_cr2);
PATCH_SITE(mmu, read_cr3);
PATCH_SITE(mmu, write_cr3);
+
+# ifdef CONFIG_X86_64
+ PATCH_SITE(cpu, usergs_sysret64);
+ PATCH_SITE(cpu, swapgs);
+ PATCH_SITE(cpu, wbinvd);
+# else
+ PATCH_SITE(cpu, iret);
+# endif
#endif
-#if defined(CONFIG_PARAVIRT_SPINLOCKS)
+
+#ifdef CONFIG_PARAVIRT_SPINLOCKS
case PARAVIRT_PATCH(lock.queued_spin_unlock):
if (pv_is_native_spin_unlock())
return paravirt_patch_insns(ibuf, len,
diff --git a/arch/x86/kernel/paravirt_patch_32.c b/arch/x86/kernel/paravirt_patch_32.c
deleted file mode 100644
index 05d771f81e74..000000000000
--- a/arch/x86/kernel/paravirt_patch_32.c
+++ /dev/null
@@ -1,64 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <asm/paravirt.h>
-
-#ifdef CONFIG_PARAVIRT_XXL
-DEF_NATIVE(irq, irq_disable, "cli");
-DEF_NATIVE(irq, irq_enable, "sti");
-DEF_NATIVE(irq, restore_fl, "push %eax; popf");
-DEF_NATIVE(irq, save_fl, "pushf; pop %eax");
-DEF_NATIVE(cpu, iret, "iret");
-DEF_NATIVE(mmu, read_cr2, "mov %cr2, %eax");
-DEF_NATIVE(mmu, write_cr3, "mov %eax, %cr3");
-DEF_NATIVE(mmu, read_cr3, "mov %cr3, %eax");
-
-unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
-{
- /* arg in %edx:%eax, return in %edx:%eax */
- return 0;
-}
-#endif
-
-#if defined(CONFIG_PARAVIRT_SPINLOCKS)
-DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%eax)");
-DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");
-#endif
-
-unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
-{
-#define PATCH_SITE(ops, x) \
- case PARAVIRT_PATCH(ops.x): \
- return paravirt_patch_insns(ibuf, len, start_##ops##_##x, end_##ops##_##x)
-
- switch (type) {
-#ifdef CONFIG_PARAVIRT_XXL
- PATCH_SITE(irq, irq_disable);
- PATCH_SITE(irq, irq_enable);
- PATCH_SITE(irq, restore_fl);
- PATCH_SITE(irq, save_fl);
- PATCH_SITE(cpu, iret);
- PATCH_SITE(mmu, read_cr2);
- PATCH_SITE(mmu, read_cr3);
- PATCH_SITE(mmu, write_cr3);
-#endif
-#if defined(CONFIG_PARAVIRT_SPINLOCKS)
- case PARAVIRT_PATCH(lock.queued_spin_unlock):
- if (pv_is_native_spin_unlock())
- return paravirt_patch_insns(ibuf, len,
- start_lock_queued_spin_unlock,
- end_lock_queued_spin_unlock);
- break;
-
- case PARAVIRT_PATCH(lock.vcpu_is_preempted):
- if (pv_is_native_vcpu_is_preempted())
- return paravirt_patch_insns(ibuf, len,
- start_lock_vcpu_is_preempted,
- end_lock_vcpu_is_preempted);
- break;
-#endif
-
- default:
- break;
- }
-#undef PATCH_SITE
- return paravirt_patch_default(type, ibuf, addr, len);
-}
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