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x86/fpu: Provide fpu_update_guest_xfd() for IA32_XFD emulation 

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>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20220105123532.12586-10-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Kevin Tian 2022-01-05 04:35:20 -08:00 committed by Paolo Bonzini
parent 5ab2f45bba
commit 8eb9a48ac1
2 changed files with 18 additions and 0 deletions
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6
arch/x86/include/asm/fpu/api.h
View File

@ -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_enable_guest_xfd_features(struct fpu_guest *guest_fpu, u64 xfeatures);
#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);

12
arch/x86/kernel/fpu/core.c
View File

@ -283,6 +283,18 @@ int fpu_enable_guest_xfd_features(struct fpu_guest *guest_fpu, u64 xfeatures)
}
EXPORT_SYMBOL_GPL(fpu_enable_guest_xfd_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;