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From: guoren@kernel.org
To: paul.walmsley@sifive.com, palmer@dabbelt.com, guoren@kernel.org,
	panqinglin2020@iscas.ac.cn, bjorn@rivosinc.com,
	conor.dooley@microchip.com, leobras@redhat.com,
	peterz@infradead.org, anup@brainfault.org, keescook@chromium.org,
	wuwei2016@iscas.ac.cn, xiaoguang.xing@sophgo.com,
	chao.wei@sophgo.com, unicorn_wang@outlook.com, uwu@icenowy.me,
	jszhang@kernel.org, wefu@redhat.com, atishp@atishpatra.org
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
	Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V12 13/14] RISC-V: paravirt: pvqspinlock: Add kconfig entry
Date: Mon, 25 Dec 2023 07:58:46 -0500	[thread overview]
Message-ID: <20231225125847.2778638-14-guoren@kernel.org> (raw)
In-Reply-To: <20231225125847.2778638-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.alibaba.com>

Add kconfig entry for paravirt_spinlock, an unfair qspinlock
virtualization-friendly backend, by halting the virtual CPU rather
than spinning.

Reviewed-by: Leonardo Bras <leobras@redhat.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/Kconfig         | 12 ++++++++++++
 arch/riscv/kernel/Makefile |  1 +
 2 files changed, 13 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index b7673c5c0997..7df3d50733c6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -780,6 +780,18 @@ config RANDOMIZE_BASE
 
           If unsure, say N.
 
+config PARAVIRT_SPINLOCKS
+	bool "Paravirtualization layer for spinlocks"
+	depends on QUEUED_SPINLOCKS
+	default y
+	help
+	  Paravirtualized spinlocks allow a unfair qspinlock to replace the
+	  test-set kvm-guest virt spinlock implementation with something
+	  virtualization-friendly, for example, halt the virtual CPU rather
+	  than spinning.
+
+	  If you are unsure how to answer this question, answer Y.
+
 endmenu # "Kernel features"
 
 menu "Boot options"
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index fee22a3d1b53..2e0754e422cf 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -102,3 +102,4 @@ obj-$(CONFIG_COMPAT)		+= compat_vdso/
 
 obj-$(CONFIG_64BIT)		+= pi/
 obj-$(CONFIG_ACPI)		+= acpi.o
+obj-$(CONFIG_PARAVIRT_SPINLOCKS) += qspinlock_paravirt.o
-- 
2.40.1


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WARNING: multiple messages have this Message-ID (diff)
From: guoren@kernel.org
To: paul.walmsley@sifive.com, palmer@dabbelt.com, guoren@kernel.org,
	panqinglin2020@iscas.ac.cn, bjorn@rivosinc.com,
	conor.dooley@microchip.com, leobras@redhat.com,
	peterz@infradead.org, anup@brainfault.org, keescook@chromium.org,
	wuwei2016@iscas.ac.cn, xiaoguang.xing@sophgo.com,
	chao.wei@sophgo.com, unicorn_wang@outlook.com, uwu@icenowy.me,
	jszhang@kernel.org, wefu@redhat.com, atishp@atishpatra.org
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
	Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V12 13/14] RISC-V: paravirt: pvqspinlock: Add kconfig entry
Date: Mon, 25 Dec 2023 07:58:46 -0500	[thread overview]
Message-ID: <20231225125847.2778638-14-guoren@kernel.org> (raw)
In-Reply-To: <20231225125847.2778638-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.alibaba.com>

Add kconfig entry for paravirt_spinlock, an unfair qspinlock
virtualization-friendly backend, by halting the virtual CPU rather
than spinning.

Reviewed-by: Leonardo Bras <leobras@redhat.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/Kconfig         | 12 ++++++++++++
 arch/riscv/kernel/Makefile |  1 +
 2 files changed, 13 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index b7673c5c0997..7df3d50733c6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -780,6 +780,18 @@ config RANDOMIZE_BASE
 
           If unsure, say N.
 
+config PARAVIRT_SPINLOCKS
+	bool "Paravirtualization layer for spinlocks"
+	depends on QUEUED_SPINLOCKS
+	default y
+	help
+	  Paravirtualized spinlocks allow a unfair qspinlock to replace the
+	  test-set kvm-guest virt spinlock implementation with something
+	  virtualization-friendly, for example, halt the virtual CPU rather
+	  than spinning.
+
+	  If you are unsure how to answer this question, answer Y.
+
 endmenu # "Kernel features"
 
 menu "Boot options"
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index fee22a3d1b53..2e0754e422cf 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -102,3 +102,4 @@ obj-$(CONFIG_COMPAT)		+= compat_vdso/
 
 obj-$(CONFIG_64BIT)		+= pi/
 obj-$(CONFIG_ACPI)		+= acpi.o
+obj-$(CONFIG_PARAVIRT_SPINLOCKS) += qspinlock_paravirt.o
-- 
2.40.1


  parent reply	other threads:[~2023-12-25 13:00 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-25 12:58 [PATCH V12 00/14] riscv: Add Native/Paravirt qspinlock support guoren
2023-12-25 12:58 ` guoren
2023-12-25 12:58 ` [PATCH V12 01/14] asm-generic: ticket-lock: Reuse arch_spinlock_t of qspinlock guoren
2023-12-25 12:58   ` guoren
2023-12-25 12:58 ` [PATCH V12 02/14] asm-generic: ticket-lock: Add separate ticket-lock.h guoren
2023-12-25 12:58   ` guoren
2023-12-25 12:58 ` [PATCH V12 03/14] riscv: errata: Move errata vendor func-id into vendorid_list.h guoren
2023-12-25 12:58   ` guoren
2024-01-04  4:00   ` Leonardo Bras
2024-01-04  4:00     ` Leonardo Bras
2023-12-25 12:58 ` [PATCH V12 04/14] riscv: qspinlock: errata: Add ERRATA_THEAD_WRITE_ONCE fixup guoren
2023-12-25 12:58   ` guoren
2023-12-25 12:58 ` [PATCH V12 05/14] riscv: qspinlock: Add basic queued_spinlock support guoren
2023-12-25 12:58   ` guoren
2023-12-25 12:58 ` [PATCH V12 06/14] riscv: qspinlock: Introduce combo spinlock guoren
2023-12-25 12:58   ` guoren
2024-01-04  4:56   ` Leonardo Bras
2024-01-04  4:56     ` Leonardo Bras
2023-12-25 12:58 ` [PATCH V12 07/14] riscv: qspinlock: Add virt_spin_lock() support for VM guest guoren
2023-12-25 12:58   ` guoren
2024-01-04  5:06   ` Leonardo Bras
2024-01-04  5:06     ` Leonardo Bras
2023-12-25 12:58 ` [PATCH V12 08/14] riscv: qspinlock: Force virt_spin_lock for KVM guests guoren
2023-12-25 12:58   ` guoren
2024-01-04  5:11   ` Leonardo Bras
2024-01-04  5:11     ` Leonardo Bras
2023-12-25 12:58 ` [PATCH V12 09/14] RISC-V: paravirt: Add pvqspinlock KVM backend guoren
2023-12-25 12:58   ` guoren
2023-12-25 12:58 ` [PATCH V12 10/14] RISC-V: paravirt: Add pvqspinlock frontend skeleton guoren
2023-12-25 12:58   ` guoren
2023-12-25 12:58 ` [PATCH V12 11/14] RISC-V: paravirt: pvqspinlock: Add SBI implementation guoren
2023-12-25 12:58   ` guoren
2023-12-25 12:58 ` [PATCH V12 12/14] RISC-V: paravirt: pvqspinlock: Add nopvspin kernel parameter guoren
2023-12-25 12:58   ` guoren
2023-12-25 12:58 ` guoren [this message]
2023-12-25 12:58   ` [PATCH V12 13/14] RISC-V: paravirt: pvqspinlock: Add kconfig entry guoren
2023-12-25 12:58 ` [PATCH V12 14/14] RISC-V: paravirt: pvqspinlock: Add trace point for pv_kick/wait guoren
2023-12-25 12:58   ` guoren
2023-12-26  0:35 ` [PATCH V12 00/14] riscv: Add Native/Paravirt qspinlock support Guo Ren
2023-12-26  0:35   ` Guo Ren

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