From: "Chang S. Bae" <chang.seok.bae@intel.com>
To: bp@suse.de, luto@kernel.org, tglx@linutronix.de,
mingo@kernel.org, x86@kernel.org
Cc: len.brown@intel.com, dave.hansen@intel.com, jing2.liu@intel.com,
ravi.v.shankar@intel.com, linux-kernel@vger.kernel.org,
chang.seok.bae@intel.com, kvm@vger.kernel.org
Subject: [PATCH v4 11/22] x86/fpu/xstate: Update the xstate save function to support dynamic states
Date: Sun, 21 Feb 2021 10:56:26 -0800 [thread overview]
Message-ID: <20210221185637.19281-12-chang.seok.bae@intel.com> (raw)
In-Reply-To: <20210221185637.19281-1-chang.seok.bae@intel.com>
Extend copy_xregs_to_kernel() to receive a mask argument of which states to
save, in preparation for dynamic user state handling.
Update KVM to set a valid fpu->state_mask, so it can continue to share with
the core code.
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Reviewed-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: kvm@vger.kernel.org
---
Changes from v3:
* Updated the changelog. (Borislav Petkov)
* Made the code change more reviewable.
Changes from v2:
* Updated the changelog to clarify the KVM code changes.
---
arch/x86/include/asm/fpu/internal.h | 3 +--
arch/x86/kernel/fpu/core.c | 2 +-
arch/x86/kvm/x86.c | 9 +++++++--
3 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index e4afc1831e29..f964f3efc92e 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -317,9 +317,8 @@ static inline void copy_kernel_to_xregs_booting(struct xregs_state *xstate)
/*
* Save processor xstate to xsave area.
*/
-static inline void copy_xregs_to_kernel(struct xregs_state *xstate)
+static inline void copy_xregs_to_kernel(struct xregs_state *xstate, u64 mask)
{
- u64 mask = xfeatures_mask_all;
u32 lmask = mask;
u32 hmask = mask >> 32;
int err;
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index dc20eabb072d..ad1ac80f98ef 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -98,7 +98,7 @@ EXPORT_SYMBOL(irq_fpu_usable);
int copy_fpregs_to_fpstate(struct fpu *fpu)
{
if (likely(use_xsave())) {
- copy_xregs_to_kernel(&fpu->state->xsave);
+ copy_xregs_to_kernel(&fpu->state->xsave, fpu->state_mask);
/*
* AVX512 state is tracked here because its use is
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c10122547ecd..ca2c0574acf2 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9275,11 +9275,16 @@ static void kvm_save_current_fpu(struct fpu *fpu)
* KVM does not support dynamic user states yet. Assume the buffer
* always has the minimum size.
*/
- if (test_thread_flag(TIF_NEED_FPU_LOAD))
+ if (test_thread_flag(TIF_NEED_FPU_LOAD)) {
memcpy(fpu->state, current->thread.fpu.state,
get_xstate_config(XSTATE_MIN_SIZE));
- else
+ } else {
+ struct fpu *src_fpu = ¤t->thread.fpu;
+
+ if (fpu->state_mask != src_fpu->state_mask)
+ fpu->state_mask = src_fpu->state_mask;
copy_fpregs_to_fpstate(fpu);
+ }
}
/* Swap (qemu) user FPU context for the guest FPU context. */
--
2.17.1
next prev parent reply other threads:[~2021-02-21 19:05 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-21 18:56 [PATCH v4 00/22] x86: Support Intel Advanced Matrix Extensions Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 01/22] x86/fpu/xstate: Modify the initialization helper to handle both static and dynamic buffers Chang S. Bae
2021-03-10 13:40 ` Borislav Petkov
2021-02-21 18:56 ` [PATCH v4 02/22] x86/fpu/xstate: Modify state copy helpers " Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 03/22] x86/fpu/xstate: Modify address finders " Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 04/22] x86/fpu/xstate: Modify the context restore helper " Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 05/22] x86/fpu/xstate: Add a new variable to indicate dynamic user states Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 06/22] x86/fpu/xstate: Add new variables to indicate dynamic xstate buffer size Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 07/22] x86/fpu/xstate: Calculate and remember dynamic xstate buffer sizes Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 08/22] x86/fpu/xstate: Convert the struct fpu 'state' field to a pointer Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 09/22] x86/fpu/xstate: Introduce helpers to manage the xstate buffer dynamically Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 10/22] x86/fpu/xstate: Define the scope of the initial xstate data Chang S. Bae
2021-02-21 18:56 ` Chang S. Bae [this message]
2021-02-21 18:56 ` [PATCH v4 12/22] x86/fpu/xstate: Update the xstate buffer address finder to support dynamic states Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 13/22] x86/fpu/xstate: Update the xstate context copy function " Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 14/22] x86/fpu/xstate: Expand the xstate buffer on the first use of dynamic user state Chang S. Bae
2021-03-20 22:13 ` Thomas Gleixner
2021-03-20 22:21 ` Andy Lutomirski
2021-03-23 21:01 ` Len Brown
2021-03-24 3:14 ` Liu, Jing2
2021-03-24 21:09 ` Len Brown
2021-03-24 21:26 ` Andy Lutomirski
2021-03-24 21:30 ` Dave Hansen
2021-03-24 21:42 ` Andy Lutomirski
2021-03-24 21:58 ` Dave Hansen
2021-03-24 22:12 ` Andy Lutomirski
2021-03-25 5:12 ` Liu, Jing2
2021-03-25 6:59 ` Bae, Chang Seok
2021-03-25 7:26 ` Liu, Jing2
2021-03-23 21:52 ` Bae, Chang Seok
2021-03-24 14:24 ` Dave Hansen
2021-03-29 13:14 ` Len Brown
2021-03-29 13:33 ` Thomas Gleixner
2021-03-29 15:43 ` Len Brown
2021-03-29 16:06 ` Len Brown
2021-03-29 17:43 ` Andy Lutomirski
2021-03-29 18:57 ` Len Brown
2021-03-29 18:49 ` Thomas Gleixner
2021-03-29 22:16 ` Len Brown
2021-03-30 8:28 ` Thomas Gleixner
2021-03-30 16:38 ` Len Brown
2021-03-26 16:34 ` Jann Horn
2021-03-29 18:14 ` Bae, Chang Seok
2021-02-21 18:56 ` [PATCH v4 15/22] x86/fpu/xstate: Support ptracer-induced xstate buffer expansion Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 16/22] x86/fpu/xstate: Extend the table to map state components with features Chang S. Bae
2021-03-20 21:25 ` Thomas Gleixner
2021-03-23 21:52 ` Bae, Chang Seok
2021-02-21 18:56 ` [PATCH v4 17/22] x86/cpufeatures/amx: Enumerate Advanced Matrix Extension (AMX) feature bits Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 18/22] x86/fpu/amx: Define AMX state components and have it used for boot-time checks Chang S. Bae
2021-03-20 21:31 ` Thomas Gleixner
2021-03-23 21:52 ` Bae, Chang Seok
2021-02-21 18:56 ` [PATCH v4 19/22] x86/fpu/amx: Enable the AMX feature in 64-bit mode Chang S. Bae
2021-03-20 21:26 ` Thomas Gleixner
2021-03-23 21:51 ` Bae, Chang Seok
2021-02-21 18:56 ` [PATCH v4 20/22] selftest/x86/amx: Include test cases for the AMX state management Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 21/22] x86/fpu/xstate: Support dynamic user state in the signal handling path Chang S. Bae
2021-02-21 18:56 ` [PATCH v4 22/22] x86/fpu/xstate: Introduce boot-parameters to control state component support Chang S. Bae
2021-02-21 19:30 ` Randy Dunlap
2021-02-21 20:10 ` Bae, Chang Seok
2021-02-21 20:37 ` Randy Dunlap
2021-03-20 20:56 ` Thomas Gleixner
2021-03-25 22:59 ` Len Brown
2021-03-25 23:10 ` Dave Hansen
2021-03-26 15:27 ` Len Brown
2021-03-26 19:22 ` Thomas Gleixner
2021-03-26 1:41 ` Andy Lutomirski
2021-03-26 15:33 ` Len Brown
2021-03-26 15:48 ` Andy Lutomirski
2021-03-26 17:53 ` Len Brown
2021-03-26 18:12 ` Andy Lutomirski
2021-03-27 4:53 ` Len Brown
2021-03-27 22:20 ` Thomas Gleixner
2021-03-29 13:31 ` Len Brown
2021-03-29 14:10 ` Thomas Gleixner
2021-03-26 18:17 ` Borislav Petkov
2021-03-27 4:41 ` Len Brown
2021-03-26 1:50 ` Thomas Gleixner
2021-03-26 15:36 ` Len Brown
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