x86/fpu: Provide fpu_update_guest_xfd() for IA32_XFD emulation

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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>

...

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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

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12

arch/x86/kernel/fpu/core.c

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