diff options
| author | Juergen Gross <jgross@suse.com> | 2021-03-11 15:23:13 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-03-11 19:51:49 +0100 |
| commit | 4e6292114c741221479046515b1aa8145cf1e3f6 (patch) | |
| tree | f3a8bb9b151d60b60c26f81872ebcc32cf55a94b /arch/x86/kernel/paravirt-spinlocks.c | |
| parent | 2fe2a2c7a97c9bc32acc79154b75e754280f7867 (diff) | |
| download | linux-4e6292114c741221479046515b1aa8145cf1e3f6.tar.bz2 | |
x86/paravirt: Add new features for paravirt patching
For being able to switch paravirt patching from special cased custom
code sequences to ALTERNATIVE handling some X86_FEATURE_* are needed
as new features. This enables to have the standard indirect pv call
as the default code and to patch that with the non-Xen custom code
sequence via ALTERNATIVE patching later.
Make sure paravirt patching is performed before alternatives patching.
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/20210311142319.4723-9-jgross@suse.com
Diffstat (limited to 'arch/x86/kernel/paravirt-spinlocks.c')
| -rw-r--r-- | arch/x86/kernel/paravirt-spinlocks.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kernel/paravirt-spinlocks.c b/arch/x86/kernel/paravirt-spinlocks.c index 4f75d0cf6305..9e1ea99ad9df 100644 --- a/arch/x86/kernel/paravirt-spinlocks.c +++ b/arch/x86/kernel/paravirt-spinlocks.c @@ -32,3 +32,12 @@ bool pv_is_native_vcpu_is_preempted(void) return pv_ops.lock.vcpu_is_preempted.func == __raw_callee_save___native_vcpu_is_preempted; } + +void __init paravirt_set_cap(void) +{ + if (!pv_is_native_spin_unlock()) + setup_force_cpu_cap(X86_FEATURE_PVUNLOCK); + + if (!pv_is_native_vcpu_is_preempted()) + setup_force_cpu_cap(X86_FEATURE_VCPUPREEMPT); +} |