[RFC PATCH 01/22] x86/fpu/xstate: Modify area init helper prototypes to access all the possible areas

From: Chang S. Bae
Date: Thu Oct 01 2020 - 16:44:20 EST


The xstate infrastructure is not flexible to support dynamic areas in
task->fpu. Change the fpstate_init() prototype to access task->fpu
directly. It treats a null pointer as indicating init_fpstate, as this
initial data does not belong to any task. For the compacted format,
fpstate_init_xstate() now accepts the state component bitmap to configure
XCOMP_BV.

No functional change.

Signed-off-by: Chang S. Bae <chang.seok.bae@xxxxxxxxx>
Reviewed-by: Len Brown <len.brown@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
---
arch/x86/include/asm/fpu/internal.h | 6 +++---
arch/x86/kernel/fpu/core.c | 14 +++++++++++---
arch/x86/kernel/fpu/init.c | 2 +-
arch/x86/kernel/fpu/regset.c | 2 +-
arch/x86/kernel/fpu/xstate.c | 3 +--
arch/x86/kvm/x86.c | 2 +-
6 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 0a460f2a3f90..c404fedf1a75 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -79,20 +79,20 @@ static __always_inline __pure bool use_fxsr(void)

extern union fpregs_state init_fpstate;

-extern void fpstate_init(union fpregs_state *state);
+extern void fpstate_init(struct fpu *fpu);
#ifdef CONFIG_MATH_EMULATION
extern void fpstate_init_soft(struct swregs_state *soft);
#else
static inline void fpstate_init_soft(struct swregs_state *soft) {}
#endif

-static inline void fpstate_init_xstate(struct xregs_state *xsave)
+static inline void fpstate_init_xstate(struct xregs_state *xsave, u64 xcomp_mask)
{
/*
* XRSTORS requires these bits set in xcomp_bv, or it will
* trigger #GP:
*/
- xsave->header.xcomp_bv = XCOMP_BV_COMPACTED_FORMAT | xfeatures_mask_all;
+ xsave->header.xcomp_bv = XCOMP_BV_COMPACTED_FORMAT | xcomp_mask;
}

static inline void fpstate_init_fxstate(struct fxregs_state *fx)
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index eb86a2b831b1..41d926c76615 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -191,8 +191,16 @@ static inline void fpstate_init_fstate(struct fregs_state *fp)
fp->fos = 0xffff0000u;
}

-void fpstate_init(union fpregs_state *state)
+/* If a null pointer is given, assume to take the initial FPU state, init_fpstate. */
+void fpstate_init(struct fpu *fpu)
{
+ union fpregs_state *state;
+
+ if (fpu)
+ state = &fpu->state;
+ else
+ state = &init_fpstate;
+
if (!static_cpu_has(X86_FEATURE_FPU)) {
fpstate_init_soft(&state->soft);
return;
@@ -201,7 +209,7 @@ void fpstate_init(union fpregs_state *state)
memset(state, 0, fpu_kernel_xstate_size);

if (static_cpu_has(X86_FEATURE_XSAVES))
- fpstate_init_xstate(&state->xsave);
+ fpstate_init_xstate(&state->xsave, xfeatures_mask_all);
if (static_cpu_has(X86_FEATURE_FXSR))
fpstate_init_fxstate(&state->fxsave);
else
@@ -261,7 +269,7 @@ static void fpu__initialize(struct fpu *fpu)
WARN_ON_FPU(fpu != &current->thread.fpu);

set_thread_flag(TIF_NEED_FPU_LOAD);
- fpstate_init(&fpu->state);
+ fpstate_init(fpu);
trace_x86_fpu_init_state(fpu);
}

diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c
index 61ddc3a5e5c2..4e89a2698cfb 100644
--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -125,7 +125,7 @@ static void __init fpu__init_system_generic(void)
* Set up the legacy init FPU context. (xstate init might overwrite this
* with a more modern format, if the CPU supports it.)
*/
- fpstate_init(&init_fpstate);
+ fpstate_init(NULL);

fpu__init_system_mxcsr();
}
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index c413756ba89f..4c4d9059ff36 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -144,7 +144,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
* In case of failure, mark all states as init:
*/
if (ret)
- fpstate_init(&fpu->state);
+ fpstate_init(fpu);

return ret;
}
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 038e19c0019e..ee4946c60ab1 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -454,8 +454,7 @@ static void __init setup_init_fpu_buf(void)
print_xstate_features();

if (boot_cpu_has(X86_FEATURE_XSAVES))
- init_fpstate.xsave.header.xcomp_bv = XCOMP_BV_COMPACTED_FORMAT |
- xfeatures_mask_all;
+ fpstate_init_xstate(&init_fpstate.xsave, xfeatures_mask_all);

/*
* Init all the features state with header.xfeatures being 0x0
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ce856e0ece84..9da8cb4b8589 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9448,7 +9448,7 @@ static int sync_regs(struct kvm_vcpu *vcpu)

static void fx_init(struct kvm_vcpu *vcpu)
{
- fpstate_init(&vcpu->arch.guest_fpu->state);
+ fpstate_init(vcpu->arch.guest_fpu);
if (boot_cpu_has(X86_FEATURE_XSAVES))
vcpu->arch.guest_fpu->state.xsave.header.xcomp_bv =
host_xcr0 | XSTATE_COMPACTION_ENABLED;
--
2.17.1