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Shutemov" Cc: Dave Hansen , Andy Lutomirski , x86@kernel.org, Kostya Serebryany , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Taras Madan , Dmitry Vyukov , "H . J . Lu" , Andi Kleen , Rick Edgecombe , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCHv6 04/11] x86/mm: Handle LAM on context switch Message-ID: References: <20220815041803.17954-1-kirill.shutemov@linux.intel.com> <20220815041803.17954-5-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220815041803.17954-5-kirill.shutemov@linux.intel.com> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1660570953; a=rsa-sha256; cv=none; b=FKZU5UXgW/FoUzLTmGwUIPhTmeURwQXlmUm4Sl5e6yGxChSHs2A35G+LCGysl0DizDyvzh +IV7jTNw/rDpxC7CwTmgSfMcw1aGtfLYN8xCzBCf+/Hg738d4gmVPDwdPXKoaBCwe4imDa NMSCk899j6MkOT2oB4c6SgS5Oc4B/Oc= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b="DVByCXY/"; spf=none (imf01.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=peterz@infradead.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1660570953; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ymx1JuhfzbLd9HnTlhd4KkXQB7Y5XGw5d1uyjIOTCSE=; b=E4lNOWbAqWutF279lU3Ij6qgZsFN1szIEmHUX4Nw/oLxYpiuBLyQd6rNiKNynHfXpwbtqm 1uLK9cWd8DkjKn8zxWynNu/MMFepHw0mE1xGPsex/vlDwgWNskaCxJpj5y36WnrrzWwvNl 8coo501PZHKCSIKZso1uJwsuwBogepM= Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b="DVByCXY/"; spf=none (imf01.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=peterz@infradead.org; dmarc=none X-Rspamd-Server: rspam05 X-Rspam-User: X-Stat-Signature: m5xwqgcbzg8q6fmhgj6mhbbej5gghns4 X-Rspamd-Queue-Id: CDC27401C5 X-HE-Tag: 1660570953-713930 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Aug 15, 2022 at 07:17:56AM +0300, Kirill A. Shutemov wrote: > diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c > index c1e31e9a85d7..fdc0b69b5da7 100644 > --- a/arch/x86/mm/tlb.c > +++ b/arch/x86/mm/tlb.c > @@ -154,17 +154,18 @@ static inline u16 user_pcid(u16 asid) > return ret; > } > > -static inline unsigned long build_cr3(pgd_t *pgd, u16 asid) > +static inline unsigned long build_cr3(pgd_t *pgd, u16 asid, unsigned long lam) > { > if (static_cpu_has(X86_FEATURE_PCID)) { > - return __sme_pa(pgd) | kern_pcid(asid); > + return __sme_pa(pgd) | kern_pcid(asid) | lam; > } else { > VM_WARN_ON_ONCE(asid != 0); > - return __sme_pa(pgd); > + return __sme_pa(pgd) | lam; > } > } > > -static inline unsigned long build_cr3_noflush(pgd_t *pgd, u16 asid) > +static inline unsigned long build_cr3_noflush(pgd_t *pgd, u16 asid, > + unsigned long lam) > { > VM_WARN_ON_ONCE(asid > MAX_ASID_AVAILABLE); > /* > @@ -173,7 +174,7 @@ static inline unsigned long build_cr3_noflush(pgd_t *pgd, u16 asid) > * boot because all CPU's the have same capabilities: > */ > VM_WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_PCID)); > - return __sme_pa(pgd) | kern_pcid(asid) | CR3_NOFLUSH; > + return __sme_pa(pgd) | kern_pcid(asid) | lam | CR3_NOFLUSH; > } Looking at this; I wonder if we want something like this: --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -157,6 +157,7 @@ static inline u16 user_pcid(u16 asid) static inline unsigned long build_cr3(pgd_t *pgd, u16 asid, unsigned long lam) { if (static_cpu_has(X86_FEATURE_PCID)) { + VM_WARN_ON_ONCE(asid > MAX_ASID_AVAILABLE); return __sme_pa(pgd) | kern_pcid(asid) | lam; } else { VM_WARN_ON_ONCE(asid != 0); @@ -167,14 +168,13 @@ static inline unsigned long build_cr3(pg static inline unsigned long build_cr3_noflush(pgd_t *pgd, u16 asid, unsigned long lam) { - VM_WARN_ON_ONCE(asid > MAX_ASID_AVAILABLE); /* * Use boot_cpu_has() instead of this_cpu_has() as this function * might be called during early boot. This should work even after * boot because all CPU's the have same capabilities: */ VM_WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_PCID)); - return __sme_pa(pgd) | kern_pcid(asid) | lam | CR3_NOFLUSH; + return build_cr3(pgd, asid, lam) | CR3_NOFLUSH; } /*