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    Subject[PATCH v2 10/23] x86/fpu: Provide fpu_update_guest_xfd() for IA32_XFD emulation
    Date
    From: Kevin Tian <kevin.tian@intel.com>

    Guest XFD can be updated either in the emulation path or in the
    restore path.

    Provide a wrapper to update guest_fpu::fpstate::xfd. If the guest
    fpstate is currently in-use, also update the per-cpu xfd cache and
    the actual MSR.

    Signed-off-by: Kevin Tian <kevin.tian@intel.com>
    Signed-off-by: Jing Liu <jing2.liu@intel.com>
    ---
    arch/x86/include/asm/fpu/api.h | 6 ++++++
    arch/x86/kernel/fpu/core.c | 12 ++++++++++++
    2 files changed, 18 insertions(+)

    diff --git a/arch/x86/include/asm/fpu/api.h b/arch/x86/include/asm/fpu/api.h
    index 8e934e571273..100b535cd3de 100644
    --- a/arch/x86/include/asm/fpu/api.h
    +++ b/arch/x86/include/asm/fpu/api.h
    @@ -140,6 +140,12 @@ extern void fpu_free_guest_fpstate(struct fpu_guest *gfpu);
    extern int fpu_swap_kvm_fpstate(struct fpu_guest *gfpu, bool enter_guest);
    extern int fpu_update_guest_perm_features(struct fpu_guest *guest_fpu);

    +#ifdef CONFIG_X86_64
    +extern void fpu_update_guest_xfd(struct fpu_guest *guest_fpu, u64 xfd);
    +#else
    +static inline void fpu_update_guest_xfd(struct fpu_guest *guest_fpu, u64 xfd) { }
    +#endif
    +
    extern void fpu_copy_guest_fpstate_to_uabi(struct fpu_guest *gfpu, void *buf, unsigned int size, u32 pkru);
    extern int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf, u64 xcr0, u32 *vpkru);

    diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
    index 2560a95980aa..3daea097c618 100644
    --- a/arch/x86/kernel/fpu/core.c
    +++ b/arch/x86/kernel/fpu/core.c
    @@ -288,6 +288,18 @@ int fpu_update_guest_perm_features(struct fpu_guest *guest_fpu)
    }
    EXPORT_SYMBOL_GPL(fpu_update_guest_perm_features);

    +#ifdef CONFIG_X86_64
    +void fpu_update_guest_xfd(struct fpu_guest *guest_fpu, u64 xfd)
    +{
    + fpregs_lock();
    + guest_fpu->fpstate->xfd = xfd;
    + if (guest_fpu->fpstate->in_use)
    + xfd_update_state(guest_fpu->fpstate);
    + fpregs_unlock();
    +}
    +EXPORT_SYMBOL_GPL(fpu_update_guest_xfd);
    +#endif /* CONFIG_X86_64 */
    +
    int fpu_swap_kvm_fpstate(struct fpu_guest *guest_fpu, bool enter_guest)
    {
    struct fpstate *guest_fps = guest_fpu->fpstate;
    --
    2.27.0
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