From: "H. Peter Anvin" <hpa@zytor.com>
To: Xin Li <xin3.li@intel.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org,
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Subject: Re: [PATCH v9 29/36] x86/fred: FRED entry/exit and dispatch code
Date: Mon, 31 Jul 2023 14:44:20 -0700 [thread overview]
Message-ID: <4ccbf0e9-716d-dfe0-537c-210e5455418c@zytor.com> (raw)
In-Reply-To: <20230731064119.3870-1-xin3.li@intel.com>
On 7/30/23 23:41, Xin Li wrote:
> +
> +static DEFINE_FRED_HANDLER(fred_sw_interrupt_user)
> +{
> + /*
> + * In compat mode INT $0x80 (32bit system call) is
> + * performance-critical. Handle it first.
> + */
> + if (IS_ENABLED(CONFIG_IA32_EMULATION) &&
> + likely(regs->vector == IA32_SYSCALL_VECTOR)) {
> + regs->orig_ax = regs->ax;
> + regs->ax = -ENOSYS;
> + return do_int80_syscall_32(regs);
> + }
We can presumably drop the early out here as well...
> +
> + /*
> + * Some software exceptions can also be triggered as
> + * int instructions, for historical reasons.
> + */
> + switch (regs->vector) {
> + case X86_TRAP_BP:
> + case X86_TRAP_OF:
> + fred_emulate_trap(regs);
> + break;
> + default:
> + regs->vector = X86_TRAP_GP;
> + fred_emulate_fault(regs);
> + break;
> + }
> +}
> +
next prev parent reply other threads:[~2023-07-31 21:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-31 6:41 [PATCH v9 29/36] x86/fred: FRED entry/exit and dispatch code Xin Li
2023-07-31 21:44 ` H. Peter Anvin [this message]
2023-07-31 22:07 ` H. Peter Anvin
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