diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-10-13 16:55:31 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-10-20 22:26:41 +0200 |
| commit | 087df48c298c1cb829f4cd468d90f93234b1bc44 (patch) | |
| tree | fe5320ccc1ae355d3318f4fdecd753766a318e1f /arch/x86/kernel/fpu | |
| parent | x86/fpu: Convert restore_fpregs_from_fpstate() to struct fpstate (diff) | |
| download | linux-087df48c298c1cb829f4cd468d90f93234b1bc44.tar.xz linux-087df48c298c1cb829f4cd468d90f93234b1bc44.zip | |
x86/fpu: Replace KVMs xstate component clearing
In order to prepare for the support of dynamically enabled FPU features,
move the clearing of xstate components to the FPU core code.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: kvm@vger.kernel.org
Link: https://lkml.kernel.org/r/20211013145322.399567049@linutronix.de
Diffstat (limited to 'arch/x86/kernel/fpu')
| -rw-r--r-- | arch/x86/kernel/fpu/xstate.c | 12 | ||||
| -rw-r--r-- | arch/x86/kernel/fpu/xstate.h | 2 |
2 files changed, 13 insertions, 1 deletions
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index 937ad5b394ca..b1409a769ba5 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -908,7 +908,6 @@ void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr) return __raw_xsave_addr(xsave, xfeature_nr); } -EXPORT_SYMBOL_GPL(get_xsave_addr); #ifdef CONFIG_ARCH_HAS_PKEYS @@ -1257,6 +1256,17 @@ void xrstors(struct xregs_state *xstate, u64 mask) WARN_ON_ONCE(err); } +#if IS_ENABLED(CONFIG_KVM) +void fpstate_clear_xstate_component(struct fpstate *fps, unsigned int xfeature) +{ + void *addr = get_xsave_addr(&fps->regs.xsave, xfeature); + + if (addr) + memset(addr, 0, xstate_sizes[xfeature]); +} +EXPORT_SYMBOL_GPL(fpstate_clear_xstate_component); +#endif + #ifdef CONFIG_PROC_PID_ARCH_STATUS /* * Report the amount of time elapsed in millisecond since last AVX512 diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h index bb6d7d298d2a..99f8cfec719d 100644 --- a/arch/x86/kernel/fpu/xstate.h +++ b/arch/x86/kernel/fpu/xstate.h @@ -21,6 +21,8 @@ extern void __copy_xstate_to_uabi_buf(struct membuf to, struct xregs_state *xsav extern void fpu__init_cpu_xstate(void); extern void fpu__init_system_xstate(void); +extern void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr); + /* XSAVE/XRSTOR wrapper functions */ #ifdef CONFIG_X86_64 |