diff options
| author | Juergen Gross <jgross@suse.com> | 2021-10-28 10:27:48 +0300 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2021-11-02 16:03:43 +0300 |
| commit | e453f872b72fb93e54ab0f3a07eeeacc2215fd15 (patch) | |
| tree | 20df57b437bbe83b8ebd6798c1f174f1929a5d98 /arch/x86/kernel | |
| parent | 12ad6cfc09a5bbe59ba9bae3a103bd3c7130c7c2 (diff) | |
| download | linux-e453f872b72fb93e54ab0f3a07eeeacc2215fd15.tar.xz | |
x86/xen: switch initial pvops IRQ functions to dummy ones
The initial pvops functions handling irq flags will only ever be called
before interrupts are being enabled.
So switch them to be dummy functions:
- xen_save_fl() can always return 0
- xen_irq_disable() is a nop
- xen_irq_enable() can BUG()
Add some generic paravirt functions for that purpose.
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20211028072748.29862-3-jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/paravirt.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index ebc45360ffd4..7157c2df3bc2 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -46,6 +46,17 @@ asm (".pushsection .entry.text, \"ax\"\n" ".type _paravirt_nop, @function\n\t" ".popsection"); +/* stub always returning 0. */ +asm (".pushsection .entry.text, \"ax\"\n" + ".global paravirt_ret0\n" + "paravirt_ret0:\n\t" + "xor %" _ASM_AX ", %" _ASM_AX ";\n\t" + "ret\n\t" + ".size paravirt_ret0, . - paravirt_ret0\n\t" + ".type paravirt_ret0, @function\n\t" + ".popsection"); + + void __init default_banner(void) { printk(KERN_INFO "Booting paravirtualized kernel on %s\n", @@ -53,7 +64,7 @@ void __init default_banner(void) } /* Undefined instruction for dealing with missing ops pointers. */ -static void paravirt_BUG(void) +noinstr void paravirt_BUG(void) { BUG(); } |