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x86/fpu: Add uabi_size to guest_fpu

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Userspace needs to inquire KVM about the buffer size to work
with the new KVM_SET_XSAVE and KVM_GET_XSAVE2. Add the size info
to guest_fpu for KVM to access.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20220105123532.12586-18-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Thomas Gleixner 2022-01-05 04:35:28 -08:00 committed by Paolo Bonzini
parent 690a757d61
commit c60427dd50
3 changed files with 7 additions and 0 deletions
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5
arch/x86/include/asm/fpu/types.h
View File

@ -522,6 +522,11 @@ struct fpu_guest {
*/
u64 xfd_err;
/*
* @uabi_size: Size required for save/restore
*/
unsigned int uabi_size;
/*
* @fpstate: Pointer to the allocated guest fpstate
*/

1
arch/x86/kernel/fpu/core.c
View File

@ -240,6 +240,7 @@ bool fpu_alloc_guest_fpstate(struct fpu_guest *gfpu)
gfpu->fpstate = fpstate;
gfpu->xfeatures = fpu_user_cfg.default_features;
gfpu->perm = fpu_user_cfg.default_features;
gfpu->uabi_size = fpu_user_cfg.default_size;
fpu_init_guest_permissions(gfpu);
return true;

1
arch/x86/kernel/fpu/xstate.c
View File

@ -1545,6 +1545,7 @@ static int fpstate_realloc(u64 xfeatures, unsigned int ksize,
newfps->is_confidential = curfps->is_confidential;
newfps->in_use = curfps->in_use;
guest_fpu->xfeatures |= xfeatures;
guest_fpu->uabi_size = usize;
}
fpregs_lock();