linux-kernel - Re: [RFC PATCH v0 3/6] x86: Enable Upper Address Ignore(UAI) feature

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Message-ID: <808EE3DA-69B1-47E3-825E-6DDCE1331F65@alien8.de>
Date:   Fri, 11 Mar 2022 12:37:09 +0000
From:   Boris Petkov <bp@...en8.de>
To:     Bharata B Rao <bharata@....com>, linux-kernel@...r.kernel.org
CC:     linux-mm@...ck.org, x86@...nel.org, shuah@...nel.org,
        kirill.shutemov@...ux.intel.com, tglx@...utronix.de,
        dave.hansen@...ux.intel.com, will@...nel.org, mingo@...hat.com,
        oleg@...hat.com, catalin.marinas@....com, ananth.narayan@....com
Subject: Re: [RFC PATCH v0 3/6] x86: Enable Upper Address Ignore(UAI) feature


>diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
>index f7a132eb794d..12615b1b4af5 100644
>--- a/arch/x86/kernel/setup.c
>+++ b/arch/x86/kernel/setup.c
>@@ -740,6 +740,12 @@ dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
> 	return 0;
> }
> 
>+static inline void __init uai_enable(void)
>+{
>+	if (boot_cpu_has(X86_FEATURE_UAI))

cpu_feature_enabled

>+		msr_set_bit(MSR_EFER, _EFER_UAI);
>+}


-- 
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