diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-10-15 03:16:13 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-10-20 15:27:27 +0200 |
| commit | ea4d6938d4c0761672ff6237964a20db3cb95cc1 (patch) | |
| tree | 75e04b4e5cc558fa5ca7de6ce69ea31d05c4c0a9 /arch/x86/include/asm/fpu | |
| parent | a0ff0611c2fbde94f6c9db8351939b08f2cb6797 (diff) | |
x86/fpu: Replace KVMs home brewed FPU copy from user
Copying a user space buffer to the memory buffer is already available in
the FPU core. The copy mechanism in KVM lacks sanity checks and needs to
use cpuid() to lookup the offset of each component, while the FPU core has
this information cached.
Make the FPU core variant accessible for KVM and replace the home brewed
mechanism.
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/20211015011539.134065207@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/fpu')
| -rw-r--r-- | arch/x86/include/asm/fpu/api.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/fpu/api.h b/arch/x86/include/asm/fpu/api.h index d2b8603a9c7e..77a732ea4cda 100644 --- a/arch/x86/include/asm/fpu/api.h +++ b/arch/x86/include/asm/fpu/api.h @@ -116,4 +116,6 @@ extern void fpu_init_fpstate_user(struct fpu *fpu); /* KVM specific functions */ extern void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask); +extern int fpu_copy_kvm_uabi_to_fpstate(struct fpu *fpu, const void *buf, u64 xcr0, u32 *pkru); + #endif /* _ASM_X86_FPU_API_H */ |