x86/pkeys: Add PKRU value to init_fpstate
The task's initial PKRU value is set partly for fpu__clear()/ copy_init_pkru_to_fpregs(). It is not part of init_fpstate.xsave and instead it is set explicitly. If the user removes the PKRU state from XSAVE in the signal handler then __fpu__restore_sig() will restore the missing bits from `init_fpstate' and initialize the PKRU value to 0. Add the `init_pkru_value' to `init_fpstate' so it is set to the init value in such a case. In theory copy_init_pkru_to_fpregs() could be removed because restoring the PKRU at return-to-userland should be enough. Signed-off-by:Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
Borislav Petkov <bp@suse.de> Reviewed-by:
Dave Hansen <dave.hansen@intel.com> Reviewed-by:
Thomas Gleixner <tglx@linutronix.de> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: "Chang S. Bae" <chang.seok.bae@intel.com> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: "Jason A. Donenfeld" <Jason@zx2c4.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: kvm ML <kvm@vger.kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Pavel Tatashin <pasha.tatashin@oracle.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Rik van Riel <riel@surriel.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190403164156.19645-28-bigeasy@linutronix.de
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