From: Thomas Gleixner <tglx@linutronix.de>
To: "Chang S. Bae" <chang.seok.bae@intel.com>,
bp@suse.de, luto@kernel.org, mingo@kernel.org, x86@kernel.org
Cc: len.brown@intel.com, lenb@kernel.org, dave.hansen@intel.com,
thiago.macieira@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: Re: [PATCH v10 10/28] x86/fpu/xstate: Update the XSTATE save function to support dynamic states
Date: Fri, 01 Oct 2021 17:41:42 +0200 [thread overview]
Message-ID: <87tui04urt.ffs@tglx> (raw)
In-Reply-To: <20210825155413.19673-11-chang.seok.bae@intel.com>
On Wed, Aug 25 2021 at 08:53, Chang S. Bae wrote:
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 74dde635df40..7c46747f6865 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -9899,11 +9899,16 @@ 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,
> fpu_buf_cfg.min_size);
What happens with the rest of the state?
> - else
> + } else {
> + struct fpu *src_fpu = ¤t->thread.fpu;
> +
> + if (fpu->state_mask != src_fpu->state_mask)
> + fpu->state_mask = src_fpu->state_mask;
What guarantees that the state size of @fpu is big enough when src_fpu
has dynamic features included?
> save_fpregs_to_fpstate(fpu);
Thanks,
tglx
next prev parent reply other threads:[~2021-10-01 15:41 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210825155413.19673-1-chang.seok.bae@intel.com>
2021-08-25 15:53 ` [PATCH v10 02/28] x86/fpu/xstate: Modify the initialization helper to handle both static and dynamic buffers Chang S. Bae
2021-10-01 12:45 ` Thomas Gleixner
2021-10-03 22:35 ` Bae, Chang Seok
2021-08-25 15:53 ` [PATCH v10 04/28] x86/fpu/xstate: Modify address finders " Chang S. Bae
2021-10-01 13:15 ` Thomas Gleixner
2021-10-03 22:35 ` Bae, Chang Seok
2021-10-04 12:54 ` Thomas Gleixner
2021-08-25 15:53 ` [PATCH v10 06/28] x86/fpu/xstate: Add new variables to indicate dynamic XSTATE buffer size Chang S. Bae
2021-10-01 13:32 ` Thomas Gleixner
2021-10-03 22:36 ` Bae, Chang Seok
2021-08-25 15:53 ` [PATCH v10 08/28] x86/fpu/xstate: Convert the struct fpu 'state' field to a pointer Chang S. Bae
2021-08-25 15:53 ` [PATCH v10 10/28] x86/fpu/xstate: Update the XSTATE save function to support dynamic states Chang S. Bae
2021-10-01 15:41 ` Thomas Gleixner [this message]
2021-10-02 21:31 ` Thomas Gleixner
2021-10-02 22:54 ` Bae, Chang Seok
2021-10-05 8:16 ` Paolo Bonzini
2021-10-05 7:50 ` Paolo Bonzini
2021-10-05 9:55 ` Thomas Gleixner
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