[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20230801083318.8363-13-xin3.li@intel.com>
Date: Tue, 1 Aug 2023 01:32:54 -0700
From: Xin Li <xin3.li@...el.com>
To: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-edac@...r.kernel.org, linux-hyperv@...r.kernel.org,
kvm@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc: Jonathan Corbet <corbet@....net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H . Peter Anvin" <hpa@...or.com>,
Andy Lutomirski <luto@...nel.org>,
Oleg Nesterov <oleg@...hat.com>,
Tony Luck <tony.luck@...el.com>,
"K . Y . Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Juergen Gross <jgross@...e.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
Josh Poimboeuf <jpoimboe@...nel.org>,
"Paul E . McKenney" <paulmck@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Randy Dunlap <rdunlap@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Kim Phillips <kim.phillips@....com>,
Xin Li <xin3.li@...el.com>,
Hyeonggon Yoo <42.hyeyoo@...il.com>,
"Liam R . Howlett" <Liam.Howlett@...cle.com>,
Sebastian Reichel <sebastian.reichel@...labora.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Suren Baghdasaryan <surenb@...gle.com>,
Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
Babu Moger <babu.moger@....com>,
Jim Mattson <jmattson@...gle.com>,
Sandipan Das <sandipan.das@....com>,
Lai Jiangshan <jiangshanlai@...il.com>,
Hans de Goede <hdegoede@...hat.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
Breno Leitao <leitao@...ian.org>,
Nikunj A Dadhania <nikunj@....com>,
Brian Gerst <brgerst@...il.com>,
Sami Tolvanen <samitolvanen@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Arnd Bergmann <arnd@...db.de>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Kees Cook <keescook@...omium.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Ze Gao <zegao2021@...il.com>, Fei Li <fei1.li@...el.com>,
Conghui <conghui.chen@...el.com>,
Ashok Raj <ashok.raj@...el.com>,
"Jason A . Donenfeld" <Jason@...c4.com>,
Mark Rutland <mark.rutland@....com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>,
Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
Jane Malalane <jane.malalane@...rix.com>,
David Woodhouse <dwmw@...zon.co.uk>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Yantengsi <siyanteng@...ngson.cn>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Sathvika Vasireddy <sv@...ux.ibm.com>
Subject: [PATCH RESEND v9 12/36] x86/fred: Update MSR_IA32_FRED_RSP0 during task switch
From: "H. Peter Anvin (Intel)" <hpa@...or.com>
MSR_IA32_FRED_RSP0 is used during ring 3 event delivery, and needs to
be updated to point to the top of next task stack during task switch.
Update MSR_IA32_FRED_RSP0 with WRMSR instruction for now, and will use
WRMSRNS/WRMSRLIST for performance once it gets upstreamed.
Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
Tested-by: Shan Kang <shan.kang@...el.com>
Signed-off-by: Xin Li <xin3.li@...el.com>
---
arch/x86/include/asm/switch_to.h | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/switch_to.h b/arch/x86/include/asm/switch_to.h
index f42dbf17f52b..6c911fd400b2 100644
--- a/arch/x86/include/asm/switch_to.h
+++ b/arch/x86/include/asm/switch_to.h
@@ -70,9 +70,16 @@ static inline void update_task_stack(struct task_struct *task)
#ifdef CONFIG_X86_32
this_cpu_write(cpu_tss_rw.x86_tss.sp1, task->thread.sp0);
#else
- /* Xen PV enters the kernel on the thread stack. */
- if (cpu_feature_enabled(X86_FEATURE_XENPV))
+ if (cpu_feature_enabled(X86_FEATURE_FRED)) {
+ /*
+ * Will use WRMSRNS/WRMSRLIST for performance once it's upstreamed.
+ */
+ wrmsrl(MSR_IA32_FRED_RSP0,
+ (unsigned long)task_stack_page(task) + THREAD_SIZE);
+ } else if (cpu_feature_enabled(X86_FEATURE_XENPV)) {
+ /* Xen PV enters the kernel on the thread stack. */
load_sp0(task_top_of_stack(task));
+ }
#endif
}
--
2.34.1
Powered by blists - more mailing lists