diff options
| author | Juergen Gross <jgross@suse.com> | 2021-03-11 15:23:16 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-03-11 19:58:54 +0100 |
| commit | ae755b5a45482b5de4d96d6f35823076af77445e (patch) | |
| tree | b617f4d18ead2e9c92e92f33b6b85086e1747b13 /arch/x86/include/asm | |
| parent | 0b8d366a942fd48a83dfa728e9f8a8d8b20e735f (diff) | |
| download | linux-ae755b5a45482b5de4d96d6f35823076af77445e.tar.gz linux-ae755b5a45482b5de4d96d6f35823076af77445e.tar.bz2 linux-ae755b5a45482b5de4d96d6f35823076af77445e.zip | |
x86/paravirt: Switch iret pvops to ALTERNATIVE
The iret paravirt op is rather special as it is using a jmp instead
of a call instruction. Switch it to ALTERNATIVE.
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210311142319.4723-12-jgross@suse.com
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/paravirt.h | 6 | ||||
| -rw-r--r-- | arch/x86/include/asm/paravirt_types.h | 5 |
2 files changed, 4 insertions, 7 deletions
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index a780509186bd..913acf7a0ebf 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -747,9 +747,9 @@ extern void default_banner(void); #define PARA_INDIRECT(addr) *addr(%rip) #define INTERRUPT_RETURN \ - PARA_SITE(PARA_PATCH(PV_CPU_iret), \ - ANNOTATE_RETPOLINE_SAFE; \ - jmp PARA_INDIRECT(pv_ops+PV_CPU_iret);) + ANNOTATE_RETPOLINE_SAFE; \ + ALTERNATIVE_TERNARY("jmp *paravirt_iret(%rip);", \ + X86_FEATURE_XENPV, "jmp xen_iret;", "jmp native_iret;") #ifdef CONFIG_DEBUG_ENTRY #define SAVE_FLAGS(clobbers) \ diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 45bd21647dd8..0afdac83f926 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -151,10 +151,6 @@ struct pv_cpu_ops { u64 (*read_pmc)(int counter); - /* Normal iret. Jump to this with the standard iret stack - frame set up. */ - void (*iret)(void); - void (*start_context_switch)(struct task_struct *prev); void (*end_context_switch)(struct task_struct *next); #endif @@ -294,6 +290,7 @@ struct paravirt_patch_template { extern struct pv_info pv_info; extern struct paravirt_patch_template pv_ops; +extern void (*paravirt_iret)(void); #define PARAVIRT_PATCH(x) \ (offsetof(struct paravirt_patch_template, x) / sizeof(void *)) |