[PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest

[PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest

[Raghavendra Rao Ananta]

Hello,

The patch series adds a KVM selftest to validate the behavior of
ARM's generic timer (patch-10). The test programs the timer IRQs
periodically, and for each interrupt, it validates the behaviour
against the architecture specifications. The test further provides
a command-line interface to configure the number of vCPUs, the
period of the timer, and the number of iterations that the test
has to run for.

Since the test heavily depends on interrupts, the patch series also
adds a basic support for ARM Generic Interrupt Controller v3 (GICv3)
to the KVM's aarch64 selftest framework (patch-9).

Furthermore, additional processor utilities such as accessing the MMIO
(via readl/writel), read/write to assembler unsupported registers,
basic delay generation, enable/disable local IRQs, spinlock support,
and so on, are also introduced that the test/GICv3 takes advantage of.
These are presented in patches 1 through 8.

The patch series, specifically the library support, is derived from the
kvm-unit-tests and the kernel itself.

Regards,
Raghavendra

Raghavendra Rao Ananta (10):
  KVM: arm64: selftests: Add MMIO readl/writel support
  KVM: arm64: selftests: Add write_sysreg_s and read_sysreg_s
  KVM: arm64: selftests: Add support for cpu_relax
  KVM: arm64: selftests: Add basic support for arch_timers
  KVM: arm64: selftests: Add basic support to generate delays
  KVM: arm64: selftests: Add support to disable and enable local IRQs
  KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1
  KVM: arm64: selftests: Add light-weight spinlock support
  KVM: arm64: selftests: Add basic GICv3 support
  KVM: arm64: selftests: Add arch_timer test

 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +-
 .../selftests/kvm/aarch64/arch_timer.c        | 382 ++++++++++++++++++
 .../kvm/include/aarch64/arch_timer.h          | 138 +++++++
 .../selftests/kvm/include/aarch64/delay.h     |  25 ++
 .../selftests/kvm/include/aarch64/gic.h       |  21 +
 .../selftests/kvm/include/aarch64/processor.h | 140 ++++++-
 .../selftests/kvm/include/aarch64/spinlock.h  |  13 +
 tools/testing/selftests/kvm/lib/aarch64/gic.c |  93 +++++
 .../selftests/kvm/lib/aarch64/gic_private.h   |  21 +
 .../selftests/kvm/lib/aarch64/gic_v3.c        | 240 +++++++++++
 .../selftests/kvm/lib/aarch64/gic_v3.h        |  70 ++++
 .../selftests/kvm/lib/aarch64/spinlock.c      |  27 ++
 13 files changed, 1172 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/aarch64/arch_timer.c
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/gic.h
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/spinlock.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_private.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/spinlock.c

-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest

[Raghavendra Rao Ananta]

Hello,

The patch series adds a KVM selftest to validate the behavior of
ARM's generic timer (patch-10). The test programs the timer IRQs
periodically, and for each interrupt, it validates the behaviour
against the architecture specifications. The test further provides
a command-line interface to configure the number of vCPUs, the
period of the timer, and the number of iterations that the test
has to run for.

Since the test heavily depends on interrupts, the patch series also
adds a basic support for ARM Generic Interrupt Controller v3 (GICv3)
to the KVM's aarch64 selftest framework (patch-9).

Furthermore, additional processor utilities such as accessing the MMIO
(via readl/writel), read/write to assembler unsupported registers,
basic delay generation, enable/disable local IRQs, spinlock support,
and so on, are also introduced that the test/GICv3 takes advantage of.
These are presented in patches 1 through 8.

The patch series, specifically the library support, is derived from the
kvm-unit-tests and the kernel itself.

Regards,
Raghavendra

Raghavendra Rao Ananta (10):
  KVM: arm64: selftests: Add MMIO readl/writel support
  KVM: arm64: selftests: Add write_sysreg_s and read_sysreg_s
  KVM: arm64: selftests: Add support for cpu_relax
  KVM: arm64: selftests: Add basic support for arch_timers
  KVM: arm64: selftests: Add basic support to generate delays
  KVM: arm64: selftests: Add support to disable and enable local IRQs
  KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1
  KVM: arm64: selftests: Add light-weight spinlock support
  KVM: arm64: selftests: Add basic GICv3 support
  KVM: arm64: selftests: Add arch_timer test

 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +-
 .../selftests/kvm/aarch64/arch_timer.c        | 382 ++++++++++++++++++
 .../kvm/include/aarch64/arch_timer.h          | 138 +++++++
 .../selftests/kvm/include/aarch64/delay.h     |  25 ++
 .../selftests/kvm/include/aarch64/gic.h       |  21 +
 .../selftests/kvm/include/aarch64/processor.h | 140 ++++++-
 .../selftests/kvm/include/aarch64/spinlock.h  |  13 +
 tools/testing/selftests/kvm/lib/aarch64/gic.c |  93 +++++
 .../selftests/kvm/lib/aarch64/gic_private.h   |  21 +
 .../selftests/kvm/lib/aarch64/gic_v3.c        | 240 +++++++++++
 .../selftests/kvm/lib/aarch64/gic_v3.h        |  70 ++++
 .../selftests/kvm/lib/aarch64/spinlock.c      |  27 ++
 13 files changed, 1172 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/aarch64/arch_timer.c
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/gic.h
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/spinlock.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_private.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/spinlock.c

-- 
2.33.0.rc1.237.g0d66db33f3-goog

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[PATCH 01/10] KVM: arm64: selftests: Add MMIO readl/writel support

[Raghavendra Rao Ananta]

Define the readl() and writel() functions for the guests to
access (4-byte) the MMIO region.

The routines, and their dependents, are inspired from the kernel's
arch/arm64/include/asm/io.h and arch/arm64/include/asm/barrier.h.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/processor.h | 45 ++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index 27dc5c2e56b9..14f68bf55036 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -127,6 +127,49 @@ void vm_install_sync_handler(struct kvm_vm *vm,
 	val;								  \
 })
 
-#define isb()	asm volatile("isb" : : : "memory")
+#define isb()		asm volatile("isb" : : : "memory")
+#define dsb(opt)	asm volatile("dsb " #opt : : : "memory")
+#define dmb(opt)	asm volatile("dmb " #opt : : : "memory")
+
+#define dma_wmb()	dmb(oshst)
+#define __iowmb()	dma_wmb()
+
+#define dma_rmb()	dmb(oshld)
+
+#define __iormb(v)							\
+({									\
+	unsigned long tmp;						\
+									\
+	dma_rmb();							\
+									\
+	/*								\
+	 * Courtesy of arch/arm64/include/asm/io.h:			\
+	 * Create a dummy control dependency from the IO read to any	\
+	 * later instructions. This ensures that a subsequent call	\
+	 * to udelay() will be ordered due to the ISB in __delay().	\
+	 */								\
+	asm volatile("eor	%0, %1, %1\n"				\
+		     "cbnz	%0, ."					\
+		     : "=r" (tmp) : "r" ((unsigned long)(v))		\
+		     : "memory");					\
+})
+
+static __always_inline void __raw_writel(u32 val, volatile void *addr)
+{
+	asm volatile("str %w0, [%1]" : : "rZ" (val), "r" (addr));
+}
+
+static __always_inline u32 __raw_readl(const volatile void *addr)
+{
+	u32 val;
+	asm volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr));
+	return val;
+}
+
+#define writel_relaxed(v,c)	((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
+#define readl_relaxed(c)	({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
+
+#define writel(v,c)		({ __iowmb(); writel_relaxed((v),(c));})
+#define readl(c)		({ u32 __v = readl_relaxed(c); __iormb(__v); __v; })
 
 #endif /* SELFTEST_KVM_PROCESSOR_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 01/10] KVM: arm64: selftests: Add MMIO readl/writel support

[Raghavendra Rao Ananta]

Define the readl() and writel() functions for the guests to
access (4-byte) the MMIO region.

The routines, and their dependents, are inspired from the kernel's
arch/arm64/include/asm/io.h and arch/arm64/include/asm/barrier.h.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/processor.h | 45 ++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index 27dc5c2e56b9..14f68bf55036 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -127,6 +127,49 @@ void vm_install_sync_handler(struct kvm_vm *vm,
 	val;								  \
 })
 
-#define isb()	asm volatile("isb" : : : "memory")
+#define isb()		asm volatile("isb" : : : "memory")
+#define dsb(opt)	asm volatile("dsb " #opt : : : "memory")
+#define dmb(opt)	asm volatile("dmb " #opt : : : "memory")
+
+#define dma_wmb()	dmb(oshst)
+#define __iowmb()	dma_wmb()
+
+#define dma_rmb()	dmb(oshld)
+
+#define __iormb(v)							\
+({									\
+	unsigned long tmp;						\
+									\
+	dma_rmb();							\
+									\
+	/*								\
+	 * Courtesy of arch/arm64/include/asm/io.h:			\
+	 * Create a dummy control dependency from the IO read to any	\
+	 * later instructions. This ensures that a subsequent call	\
+	 * to udelay() will be ordered due to the ISB in __delay().	\
+	 */								\
+	asm volatile("eor	%0, %1, %1\n"				\
+		     "cbnz	%0, ."					\
+		     : "=r" (tmp) : "r" ((unsigned long)(v))		\
+		     : "memory");					\
+})
+
+static __always_inline void __raw_writel(u32 val, volatile void *addr)
+{
+	asm volatile("str %w0, [%1]" : : "rZ" (val), "r" (addr));
+}
+
+static __always_inline u32 __raw_readl(const volatile void *addr)
+{
+	u32 val;
+	asm volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr));
+	return val;
+}
+
+#define writel_relaxed(v,c)	((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
+#define readl_relaxed(c)	({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
+
+#define writel(v,c)		({ __iowmb(); writel_relaxed((v),(c));})
+#define readl(c)		({ u32 __v = readl_relaxed(c); __iormb(__v); __v; })
 
 #endif /* SELFTEST_KVM_PROCESSOR_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

[PATCH 02/10] KVM: arm64: selftests: Add write_sysreg_s and read_sysreg_s

[Raghavendra Rao Ananta]

For register names that are unsupported by the assembler or the ones
without architectural names, add the macros write_sysreg_s and
read_sysreg_s to support them.

The functionality is derived from kvm-unit-tests and kernel's
arch/arm64/include/asm/sysreg.h.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/processor.h | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index 14f68bf55036..b4bbce837288 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -115,6 +115,67 @@ void vm_install_exception_handler(struct kvm_vm *vm,
 void vm_install_sync_handler(struct kvm_vm *vm,
 		int vector, int ec, handler_fn handler);
 
+/*
+ * ARMv8 ARM reserves the following encoding for system registers:
+ * (Ref: ARMv8 ARM, Section: "System instruction class encoding overview",
+ *  C5.2, version:ARM DDI 0487A.f)
+ *	[20-19] : Op0
+ *	[18-16] : Op1
+ *	[15-12] : CRn
+ *	[11-8]  : CRm
+ *	[7-5]   : Op2
+ */
+#define Op0_shift	19
+#define Op0_mask	0x3
+#define Op1_shift	16
+#define Op1_mask	0x7
+#define CRn_shift	12
+#define CRn_mask	0xf
+#define CRm_shift	8
+#define CRm_mask	0xf
+#define Op2_shift	5
+#define Op2_mask	0x7
+
+/*
+ * When accessed from guests, the ARM64_SYS_REG() doesn't work since it
+ * generates a different encoding for additional KVM processing, and is
+ * only suitable for userspace to access the register via ioctls.
+ * Hence, define a 'pure' sys_reg() here to generate the encodings as per spec.
+ */
+#define sys_reg(op0, op1, crn, crm, op2) \
+	(((op0) << Op0_shift) | ((op1) << Op1_shift) | \
+	 ((crn) << CRn_shift) | ((crm) << CRm_shift) | \
+	 ((op2) << Op2_shift))
+
+asm(
+"	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
+"	.equ	.L__reg_num_x\\num, \\num\n"
+"	.endr\n"
+"	.equ	.L__reg_num_xzr, 31\n"
+"\n"
+"	.macro	mrs_s, rt, sreg\n"
+"	.inst	0xd5200000|(\\sreg)|(.L__reg_num_\\rt)\n"
+"	.endm\n"
+"\n"
+"	.macro	msr_s, sreg, rt\n"
+"	.inst	0xd5000000|(\\sreg)|(.L__reg_num_\\rt)\n"
+"	.endm\n"
+);
+
+/*
+ * read_sysreg_s() and write_sysreg_s()'s 'reg' has to be encoded via sys_reg()
+ */
+#define read_sysreg_s(reg) ({						\
+	u64 __val;							\
+	asm volatile("mrs_s %0, "__stringify(reg) : "=r" (__val));	\
+	__val;								\
+})
+
+#define write_sysreg_s(reg, val) do {					\
+	u64 __val = (u64)val;						\
+	asm volatile("msr_s "__stringify(reg) ", %x0" : : "rZ" (__val));\
+} while (0)
+
 #define write_sysreg(reg, val)						  \
 ({									  \
 	u64 __val = (u64)(val);						  \
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 02/10] KVM: arm64: selftests: Add write_sysreg_s and read_sysreg_s

[Raghavendra Rao Ananta]

For register names that are unsupported by the assembler or the ones
without architectural names, add the macros write_sysreg_s and
read_sysreg_s to support them.

The functionality is derived from kvm-unit-tests and kernel's
arch/arm64/include/asm/sysreg.h.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/processor.h | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index 14f68bf55036..b4bbce837288 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -115,6 +115,67 @@ void vm_install_exception_handler(struct kvm_vm *vm,
 void vm_install_sync_handler(struct kvm_vm *vm,
 		int vector, int ec, handler_fn handler);
 
+/*
+ * ARMv8 ARM reserves the following encoding for system registers:
+ * (Ref: ARMv8 ARM, Section: "System instruction class encoding overview",
+ *  C5.2, version:ARM DDI 0487A.f)
+ *	[20-19] : Op0
+ *	[18-16] : Op1
+ *	[15-12] : CRn
+ *	[11-8]  : CRm
+ *	[7-5]   : Op2
+ */
+#define Op0_shift	19
+#define Op0_mask	0x3
+#define Op1_shift	16
+#define Op1_mask	0x7
+#define CRn_shift	12
+#define CRn_mask	0xf
+#define CRm_shift	8
+#define CRm_mask	0xf
+#define Op2_shift	5
+#define Op2_mask	0x7
+
+/*
+ * When accessed from guests, the ARM64_SYS_REG() doesn't work since it
+ * generates a different encoding for additional KVM processing, and is
+ * only suitable for userspace to access the register via ioctls.
+ * Hence, define a 'pure' sys_reg() here to generate the encodings as per spec.
+ */
+#define sys_reg(op0, op1, crn, crm, op2) \
+	(((op0) << Op0_shift) | ((op1) << Op1_shift) | \
+	 ((crn) << CRn_shift) | ((crm) << CRm_shift) | \
+	 ((op2) << Op2_shift))
+
+asm(
+"	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
+"	.equ	.L__reg_num_x\\num, \\num\n"
+"	.endr\n"
+"	.equ	.L__reg_num_xzr, 31\n"
+"\n"
+"	.macro	mrs_s, rt, sreg\n"
+"	.inst	0xd5200000|(\\sreg)|(.L__reg_num_\\rt)\n"
+"	.endm\n"
+"\n"
+"	.macro	msr_s, sreg, rt\n"
+"	.inst	0xd5000000|(\\sreg)|(.L__reg_num_\\rt)\n"
+"	.endm\n"
+);
+
+/*
+ * read_sysreg_s() and write_sysreg_s()'s 'reg' has to be encoded via sys_reg()
+ */
+#define read_sysreg_s(reg) ({						\
+	u64 __val;							\
+	asm volatile("mrs_s %0, "__stringify(reg) : "=r" (__val));	\
+	__val;								\
+})
+
+#define write_sysreg_s(reg, val) do {					\
+	u64 __val = (u64)val;						\
+	asm volatile("msr_s "__stringify(reg) ", %x0" : : "rZ" (__val));\
+} while (0)
+
 #define write_sysreg(reg, val)						  \
 ({									  \
 	u64 __val = (u64)(val);						  \
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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[PATCH 03/10] KVM: arm64: selftests: Add support for cpu_relax

[Raghavendra Rao Ananta]

Implement the guest helper routine, cpu_relax(), to yield
the processor to other tasks.

The function was derived from
arch/arm64/include/asm/vdso/processor.h.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 tools/testing/selftests/kvm/include/aarch64/processor.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index b4bbce837288..c83ff99282ed 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -188,6 +188,11 @@ asm(
 	val;								  \
 })
 
+static inline void cpu_relax(void)
+{
+	asm volatile("yield" ::: "memory");
+}
+
 #define isb()		asm volatile("isb" : : : "memory")
 #define dsb(opt)	asm volatile("dsb " #opt : : : "memory")
 #define dmb(opt)	asm volatile("dmb " #opt : : : "memory")
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 03/10] KVM: arm64: selftests: Add support for cpu_relax

[Raghavendra Rao Ananta]

Implement the guest helper routine, cpu_relax(), to yield
the processor to other tasks.

The function was derived from
arch/arm64/include/asm/vdso/processor.h.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 tools/testing/selftests/kvm/include/aarch64/processor.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index b4bbce837288..c83ff99282ed 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -188,6 +188,11 @@ asm(
 	val;								  \
 })
 
+static inline void cpu_relax(void)
+{
+	asm volatile("yield" ::: "memory");
+}
+
 #define isb()		asm volatile("isb" : : : "memory")
 #define dsb(opt)	asm volatile("dsb " #opt : : : "memory")
 #define dmb(opt)	asm volatile("dmb " #opt : : : "memory")
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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[PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers

[Raghavendra Rao Ananta]

Add a minimalistic library support to access the virtual timers,
that can be used for simple timing functionalities, such as
introducing delays in the guest.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../kvm/include/aarch64/arch_timer.h          | 138 ++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h

diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
new file mode 100644
index 000000000000..e6144ab95348
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) specific defines
+ */
+
+#ifndef SELFTEST_KVM_ARCH_TIMER_H
+#define SELFTEST_KVM_ARCH_TIMER_H
+
+#include <linux/sizes.h>
+
+#include "processor.h"
+
+enum arch_timer {
+	VIRTUAL,
+	PHYSICAL,
+};
+
+#define CTL_ENABLE	(1 << 0)
+#define CTL_ISTATUS	(1 << 2)
+#define CTL_IMASK	(1 << 1)
+
+#define msec_to_cycles(msec)	\
+	(timer_get_cntfrq() * (uint64_t)(msec) / 1000)
+
+#define usec_to_cycles(usec)	\
+	(timer_get_cntfrq() * (uint64_t)(usec) / 1000000)
+
+#define cycles_to_usec(cycles) \
+	((uint64_t)(cycles) * 1000000 / timer_get_cntfrq())
+
+static inline uint32_t timer_get_cntfrq(void)
+{
+	return read_sysreg(cntfrq_el0);
+}
+
+static inline uint64_t timer_get_cntct(enum arch_timer timer)
+{
+	isb();
+
+	switch (timer) {
+	case VIRTUAL:
+		return read_sysreg(cntvct_el0);
+	case PHYSICAL:
+		return read_sysreg(cntpct_el0);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	/* We should not reach here */
+	return 0;
+}
+
+static inline void timer_set_cval(enum arch_timer timer, uint64_t cval)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return write_sysreg(cntv_cval_el0, cval);
+	case PHYSICAL:
+		return write_sysreg(cntp_cval_el0, cval);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	isb();
+}
+
+static inline uint64_t timer_get_cval(enum arch_timer timer)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return read_sysreg(cntv_cval_el0);
+	case PHYSICAL:
+		return read_sysreg(cntp_cval_el0);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	/* We should not reach here */
+	return 0;
+}
+
+static inline void timer_set_tval(enum arch_timer timer, uint32_t tval)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return write_sysreg(cntv_tval_el0, tval);
+	case PHYSICAL:
+		return write_sysreg(cntp_tval_el0, tval);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	isb();
+}
+
+static inline void timer_set_ctl(enum arch_timer timer, uint32_t ctl)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return write_sysreg(cntv_ctl_el0, ctl);
+	case PHYSICAL:
+		return write_sysreg(cntp_ctl_el0, ctl);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	isb();
+}
+
+static inline uint32_t timer_get_ctl(enum arch_timer timer)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return read_sysreg(cntv_ctl_el0);
+	case PHYSICAL:
+		return read_sysreg(cntp_ctl_el0);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	/* We should not reach here */
+	return 0;
+}
+
+static inline void timer_set_next_cval_ms(enum arch_timer timer, uint32_t msec)
+{
+	uint64_t now_ct = timer_get_cntct(timer);
+	uint64_t next_ct = now_ct + msec_to_cycles(msec);
+
+	timer_set_cval(timer, next_ct);
+}
+
+static inline void timer_set_next_tval_ms(enum arch_timer timer, uint32_t msec)
+{
+	timer_set_tval(timer, msec_to_cycles(msec));
+}
+
+#endif /* SELFTEST_KVM_ARCH_TIMER_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers

[Raghavendra Rao Ananta]

Add a minimalistic library support to access the virtual timers,
that can be used for simple timing functionalities, such as
introducing delays in the guest.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../kvm/include/aarch64/arch_timer.h          | 138 ++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h

diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
new file mode 100644
index 000000000000..e6144ab95348
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) specific defines
+ */
+
+#ifndef SELFTEST_KVM_ARCH_TIMER_H
+#define SELFTEST_KVM_ARCH_TIMER_H
+
+#include <linux/sizes.h>
+
+#include "processor.h"
+
+enum arch_timer {
+	VIRTUAL,
+	PHYSICAL,
+};
+
+#define CTL_ENABLE	(1 << 0)
+#define CTL_ISTATUS	(1 << 2)
+#define CTL_IMASK	(1 << 1)
+
+#define msec_to_cycles(msec)	\
+	(timer_get_cntfrq() * (uint64_t)(msec) / 1000)
+
+#define usec_to_cycles(usec)	\
+	(timer_get_cntfrq() * (uint64_t)(usec) / 1000000)
+
+#define cycles_to_usec(cycles) \
+	((uint64_t)(cycles) * 1000000 / timer_get_cntfrq())
+
+static inline uint32_t timer_get_cntfrq(void)
+{
+	return read_sysreg(cntfrq_el0);
+}
+
+static inline uint64_t timer_get_cntct(enum arch_timer timer)
+{
+	isb();
+
+	switch (timer) {
+	case VIRTUAL:
+		return read_sysreg(cntvct_el0);
+	case PHYSICAL:
+		return read_sysreg(cntpct_el0);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	/* We should not reach here */
+	return 0;
+}
+
+static inline void timer_set_cval(enum arch_timer timer, uint64_t cval)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return write_sysreg(cntv_cval_el0, cval);
+	case PHYSICAL:
+		return write_sysreg(cntp_cval_el0, cval);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	isb();
+}
+
+static inline uint64_t timer_get_cval(enum arch_timer timer)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return read_sysreg(cntv_cval_el0);
+	case PHYSICAL:
+		return read_sysreg(cntp_cval_el0);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	/* We should not reach here */
+	return 0;
+}
+
+static inline void timer_set_tval(enum arch_timer timer, uint32_t tval)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return write_sysreg(cntv_tval_el0, tval);
+	case PHYSICAL:
+		return write_sysreg(cntp_tval_el0, tval);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	isb();
+}
+
+static inline void timer_set_ctl(enum arch_timer timer, uint32_t ctl)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return write_sysreg(cntv_ctl_el0, ctl);
+	case PHYSICAL:
+		return write_sysreg(cntp_ctl_el0, ctl);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	isb();
+}
+
+static inline uint32_t timer_get_ctl(enum arch_timer timer)
+{
+	switch (timer) {
+	case VIRTUAL:
+		return read_sysreg(cntv_ctl_el0);
+	case PHYSICAL:
+		return read_sysreg(cntp_ctl_el0);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	/* We should not reach here */
+	return 0;
+}
+
+static inline void timer_set_next_cval_ms(enum arch_timer timer, uint32_t msec)
+{
+	uint64_t now_ct = timer_get_cntct(timer);
+	uint64_t next_ct = now_ct + msec_to_cycles(msec);
+
+	timer_set_cval(timer, next_ct);
+}
+
+static inline void timer_set_next_tval_ms(enum arch_timer timer, uint32_t msec)
+{
+	timer_set_tval(timer, msec_to_cycles(msec));
+}
+
+#endif /* SELFTEST_KVM_ARCH_TIMER_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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[PATCH 05/10] KVM: arm64: selftests: Add basic support to generate delays

[Raghavendra Rao Ananta]

Add udelay() support to generate a delay in the guest.

The routines are derived and simplified from kernel's
arch/arm64/lib/delay.c.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/delay.h     | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h

diff --git a/tools/testing/selftests/kvm/include/aarch64/delay.h b/tools/testing/selftests/kvm/include/aarch64/delay.h
new file mode 100644
index 000000000000..329e4f5079ea
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/delay.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM simple delay routines
+ */
+
+#ifndef SELFTEST_KVM_ARM_DELAY_H
+#define SELFTEST_KVM_ARM_DELAY_H
+
+#include "arch_timer.h"
+
+static inline void __delay(uint64_t cycles)
+{
+	enum arch_timer timer = VIRTUAL;
+	uint64_t start = timer_get_cntct(timer);
+
+	while ((timer_get_cntct(timer) - start) < cycles)
+		cpu_relax();
+}
+
+static inline void udelay(unsigned long usec)
+{
+	__delay(usec_to_cycles(usec));
+}
+
+#endif /* SELFTEST_KVM_ARM_DELAY_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 05/10] KVM: arm64: selftests: Add basic support to generate delays

[Raghavendra Rao Ananta]

Add udelay() support to generate a delay in the guest.

The routines are derived and simplified from kernel's
arch/arm64/lib/delay.c.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/delay.h     | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h

diff --git a/tools/testing/selftests/kvm/include/aarch64/delay.h b/tools/testing/selftests/kvm/include/aarch64/delay.h
new file mode 100644
index 000000000000..329e4f5079ea
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/delay.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM simple delay routines
+ */
+
+#ifndef SELFTEST_KVM_ARM_DELAY_H
+#define SELFTEST_KVM_ARM_DELAY_H
+
+#include "arch_timer.h"
+
+static inline void __delay(uint64_t cycles)
+{
+	enum arch_timer timer = VIRTUAL;
+	uint64_t start = timer_get_cntct(timer);
+
+	while ((timer_get_cntct(timer) - start) < cycles)
+		cpu_relax();
+}
+
+static inline void udelay(unsigned long usec)
+{
+	__delay(usec_to_cycles(usec));
+}
+
+#endif /* SELFTEST_KVM_ARM_DELAY_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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[PATCH 06/10] KVM: arm64: selftests: Add support to disable and enable local IRQs

[Raghavendra Rao Ananta]

Add functions local_irq_enable() and local_irq_disable() to
enable and disable the IRQs from the guest, respectively.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../testing/selftests/kvm/include/aarch64/processor.h  | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index c83ff99282ed..ae7a079ae180 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -238,4 +238,14 @@ static __always_inline u32 __raw_readl(const volatile void *addr)
 #define writel(v,c)		({ __iowmb(); writel_relaxed((v),(c));})
 #define readl(c)		({ u32 __v = readl_relaxed(c); __iormb(__v); __v; })
 
+static inline void local_irq_enable(void)
+{
+	asm volatile("msr daifclr, #3" : : : "memory");
+}
+
+static inline void local_irq_disable(void)
+{
+	asm volatile("msr daifset, #3" : : : "memory");
+}
+
 #endif /* SELFTEST_KVM_PROCESSOR_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 06/10] KVM: arm64: selftests: Add support to disable and enable local IRQs

[Raghavendra Rao Ananta]

Add functions local_irq_enable() and local_irq_disable() to
enable and disable the IRQs from the guest, respectively.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../testing/selftests/kvm/include/aarch64/processor.h  | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index c83ff99282ed..ae7a079ae180 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -238,4 +238,14 @@ static __always_inline u32 __raw_readl(const volatile void *addr)
 #define writel(v,c)		({ __iowmb(); writel_relaxed((v),(c));})
 #define readl(c)		({ u32 __v = readl_relaxed(c); __iormb(__v); __v; })
 
+static inline void local_irq_enable(void)
+{
+	asm volatile("msr daifclr, #3" : : : "memory");
+}
+
+static inline void local_irq_disable(void)
+{
+	asm volatile("msr daifset, #3" : : : "memory");
+}
+
 #endif /* SELFTEST_KVM_PROCESSOR_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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[PATCH 07/10] KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1

[Raghavendra Rao Ananta]

At times, such as when in the interrupt handler, the guest wants to
get the vCPU-id that it's running on. As a result, introduce
get_vcpuid() that parses the MPIDR_EL1 and returns the vcpuid to the
requested caller.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/processor.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index ae7a079ae180..e9342e63d05d 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -248,4 +248,23 @@ static inline void local_irq_disable(void)
 	asm volatile("msr daifset, #3" : : : "memory");
 }
 
+#define MPIDR_LEVEL_BITS 8
+#define MPIDR_LEVEL_SHIFT(level) (MPIDR_LEVEL_BITS * level)
+#define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1)
+#define MPIDR_AFFINITY_LEVEL(mpidr, level) \
+	((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK)
+
+static inline uint32_t get_vcpuid(void)
+{
+	uint32_t vcpuid = 0;
+	uint64_t mpidr = read_sysreg(mpidr_el1);
+
+	/* KVM limits only 16 vCPUs at level 0 */
+	vcpuid = mpidr & 0x0f;
+	vcpuid |= MPIDR_AFFINITY_LEVEL(mpidr, 1) << 4;
+	vcpuid |= MPIDR_AFFINITY_LEVEL(mpidr, 2) << 12;
+
+	return vcpuid;
+}
+
 #endif /* SELFTEST_KVM_PROCESSOR_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 07/10] KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1

[Raghavendra Rao Ananta]

At times, such as when in the interrupt handler, the guest wants to
get the vCPU-id that it's running on. As a result, introduce
get_vcpuid() that parses the MPIDR_EL1 and returns the vcpuid to the
requested caller.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/processor.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index ae7a079ae180..e9342e63d05d 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -248,4 +248,23 @@ static inline void local_irq_disable(void)
 	asm volatile("msr daifset, #3" : : : "memory");
 }
 
+#define MPIDR_LEVEL_BITS 8
+#define MPIDR_LEVEL_SHIFT(level) (MPIDR_LEVEL_BITS * level)
+#define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1)
+#define MPIDR_AFFINITY_LEVEL(mpidr, level) \
+	((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK)
+
+static inline uint32_t get_vcpuid(void)
+{
+	uint32_t vcpuid = 0;
+	uint64_t mpidr = read_sysreg(mpidr_el1);
+
+	/* KVM limits only 16 vCPUs at level 0 */
+	vcpuid = mpidr & 0x0f;
+	vcpuid |= MPIDR_AFFINITY_LEVEL(mpidr, 1) << 4;
+	vcpuid |= MPIDR_AFFINITY_LEVEL(mpidr, 2) << 12;
+
+	return vcpuid;
+}
+
 #endif /* SELFTEST_KVM_PROCESSOR_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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[PATCH 08/10] KVM: arm64: selftests: Add light-weight spinlock support

[Raghavendra Rao Ananta]

Add a simpler version of spinlock support for ARM64 for
the guests to use.

The implementation is loosely based on the spinlock
implementation in kvm-unit-tests.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 tools/testing/selftests/kvm/Makefile          |  2 +-
 .../selftests/kvm/include/aarch64/spinlock.h  | 13 +++++++++
 .../selftests/kvm/lib/aarch64/spinlock.c      | 27 +++++++++++++++++++
 3 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/spinlock.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/spinlock.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 5832f510a16c..8f6d82b570bd 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -35,7 +35,7 @@ endif
 
 LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
 LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
-LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S
+LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c
 LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
 
 TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
diff --git a/tools/testing/selftests/kvm/include/aarch64/spinlock.h b/tools/testing/selftests/kvm/include/aarch64/spinlock.h
new file mode 100644
index 000000000000..cf0984106d14
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/spinlock.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef SELFTEST_KVM_ARM64_SPINLOCK_H
+#define SELFTEST_KVM_ARM64_SPINLOCK_H
+
+struct spinlock {
+	int v;
+};
+
+extern void spin_lock(struct spinlock *lock);
+extern void spin_unlock(struct spinlock *lock);
+
+#endif /* SELFTEST_KVM_ARM64_SPINLOCK_H */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/spinlock.c b/tools/testing/selftests/kvm/lib/aarch64/spinlock.c
new file mode 100644
index 000000000000..6d66a3dac237
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/spinlock.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM64 Spinlock support
+ */
+#include <stdint.h>
+
+#include "spinlock.h"
+
+void spin_lock(struct spinlock *lock)
+{
+	uint32_t val, res;
+
+	asm volatile(
+	"1:	ldaxr	%w0, [%2]\n"
+	"	cbnz	%w0, 1b\n"
+	"	mov	%w0, #1\n"
+	"	stxr	%w1, %w0, [%2]\n"
+	"	cbnz	%w1, 1b\n"
+	: "=&r" (val), "=&r" (res)
+	: "r" (&lock->v)
+	: "memory");
+}
+
+void spin_unlock(struct spinlock *lock)
+{
+	asm volatile("stlr wzr, [%0]\n"	: : "r" (&lock->v) : "memory");
+}
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 08/10] KVM: arm64: selftests: Add light-weight spinlock support

[Raghavendra Rao Ananta]

Add a simpler version of spinlock support for ARM64 for
the guests to use.

The implementation is loosely based on the spinlock
implementation in kvm-unit-tests.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 tools/testing/selftests/kvm/Makefile          |  2 +-
 .../selftests/kvm/include/aarch64/spinlock.h  | 13 +++++++++
 .../selftests/kvm/lib/aarch64/spinlock.c      | 27 +++++++++++++++++++
 3 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/spinlock.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/spinlock.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 5832f510a16c..8f6d82b570bd 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -35,7 +35,7 @@ endif
 
 LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
 LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
-LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S
+LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c
 LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
 
 TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
diff --git a/tools/testing/selftests/kvm/include/aarch64/spinlock.h b/tools/testing/selftests/kvm/include/aarch64/spinlock.h
new file mode 100644
index 000000000000..cf0984106d14
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/spinlock.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef SELFTEST_KVM_ARM64_SPINLOCK_H
+#define SELFTEST_KVM_ARM64_SPINLOCK_H
+
+struct spinlock {
+	int v;
+};
+
+extern void spin_lock(struct spinlock *lock);
+extern void spin_unlock(struct spinlock *lock);
+
+#endif /* SELFTEST_KVM_ARM64_SPINLOCK_H */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/spinlock.c b/tools/testing/selftests/kvm/lib/aarch64/spinlock.c
new file mode 100644
index 000000000000..6d66a3dac237
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/spinlock.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM64 Spinlock support
+ */
+#include <stdint.h>
+
+#include "spinlock.h"
+
+void spin_lock(struct spinlock *lock)
+{
+	uint32_t val, res;
+
+	asm volatile(
+	"1:	ldaxr	%w0, [%2]\n"
+	"	cbnz	%w0, 1b\n"
+	"	mov	%w0, #1\n"
+	"	stxr	%w1, %w0, [%2]\n"
+	"	cbnz	%w1, 1b\n"
+	: "=&r" (val), "=&r" (res)
+	: "r" (&lock->v)
+	: "memory");
+}
+
+void spin_unlock(struct spinlock *lock)
+{
+	asm volatile("stlr wzr, [%0]\n"	: : "r" (&lock->v) : "memory");
+}
-- 
2.33.0.rc1.237.g0d66db33f3-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

[PATCH 09/10] KVM: arm64: selftests: Add basic GICv3 support

[Raghavendra Rao Ananta]

Add basic support for ARM Generic Interrupt Controller v3.
The support provides guests to setup interrupts.

The work is inspired from kvm-unit-tests and the kernel's
GIC driver (drivers/irqchip/irq-gic-v3.c).

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 tools/testing/selftests/kvm/Makefile          |   2 +-
 .../selftests/kvm/include/aarch64/gic.h       |  21 ++
 tools/testing/selftests/kvm/lib/aarch64/gic.c |  93 +++++++
 .../selftests/kvm/lib/aarch64/gic_private.h   |  21 ++
 .../selftests/kvm/lib/aarch64/gic_v3.c        | 240 ++++++++++++++++++
 .../selftests/kvm/lib/aarch64/gic_v3.h        |  70 +++++
 6 files changed, 446 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/gic.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_private.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.h

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 8f6d82b570bd..a170166334a3 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -35,7 +35,7 @@ endif
 
 LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
 LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
-LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c
+LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c lib/aarch64/gic.c lib/aarch64/gic_v3.c
 LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
 
 TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
diff --git a/tools/testing/selftests/kvm/include/aarch64/gic.h b/tools/testing/selftests/kvm/include/aarch64/gic.h
new file mode 100644
index 000000000000..85dd1e53048e
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/gic.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) specific defines
+ */
+
+#ifndef SELFTEST_KVM_GIC_H
+#define SELFTEST_KVM_GIC_H
+
+enum gic_type {
+	GIC_V3,
+	GIC_TYPE_MAX,
+};
+
+void gic_init(enum gic_type type, unsigned int nr_cpus,
+		void *dist_base, void *redist_base);
+void gic_irq_enable(unsigned int intid);
+void gic_irq_disable(unsigned int intid);
+unsigned int gic_get_and_ack_irq(void);
+void gic_set_eoi(unsigned int intid);
+
+#endif /* SELFTEST_KVM_GIC_H */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic.c b/tools/testing/selftests/kvm/lib/aarch64/gic.c
new file mode 100644
index 000000000000..b0b67f5aeaa6
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM Generic Interrupt Controller (GIC) support
+ */
+
+#include <errno.h>
+#include <linux/bits.h>
+#include <linux/sizes.h>
+
+#include "kvm_util.h"
+
+#include <gic.h>
+#include "gic_private.h"
+#include "processor.h"
+#include "spinlock.h"
+
+static const struct gic_common_ops *gic_common_ops;
+static struct spinlock gic_lock;
+
+static void gic_cpu_init(unsigned int cpu, void *redist_base)
+{
+	gic_common_ops->gic_cpu_init(cpu, redist_base);
+}
+
+static void
+gic_dist_init(enum gic_type type, unsigned int nr_cpus, void *dist_base)
+{
+	const struct gic_common_ops *gic_ops;
+
+	spin_lock(&gic_lock);
+
+	/* Distributor initialization is needed only once per VM */
+	if (gic_common_ops) {
+		spin_unlock(&gic_lock);
+		return;
+	}
+
+	if (type == GIC_V3)
+		gic_ops = &gicv3_ops;
+
+	gic_ops->gic_init(nr_cpus, dist_base);
+	gic_common_ops = gic_ops;
+
+	/* Make sure that the initialized data is visible to all the vCPUs */
+	dsb(sy);
+
+	spin_unlock(&gic_lock);
+}
+
+void gic_init(enum gic_type type, unsigned int nr_cpus,
+		void *dist_base, void *redist_base)
+{
+	uint32_t cpu = get_vcpuid();
+
+	GUEST_ASSERT(type < GIC_TYPE_MAX);
+	GUEST_ASSERT(dist_base);
+	GUEST_ASSERT(redist_base);
+	GUEST_ASSERT(nr_cpus);
+
+	gic_dist_init(type, nr_cpus, dist_base);
+	gic_cpu_init(cpu, redist_base);
+}
+
+void gic_irq_enable(unsigned int intid)
+{
+	GUEST_ASSERT(gic_common_ops);
+	gic_common_ops->gic_irq_enable(intid);
+}
+
+void gic_irq_disable(unsigned int intid)
+{
+	GUEST_ASSERT(gic_common_ops);
+	gic_common_ops->gic_irq_disable(intid);
+}
+
+unsigned int gic_get_and_ack_irq(void)
+{
+	uint64_t irqstat;
+	unsigned int intid;
+
+	GUEST_ASSERT(gic_common_ops);
+
+	irqstat = gic_common_ops->gic_read_iar();
+	intid = irqstat & GENMASK(23, 0);
+
+	return intid;
+}
+
+void gic_set_eoi(unsigned int intid)
+{
+	GUEST_ASSERT(gic_common_ops);
+	gic_common_ops->gic_write_eoir(intid);
+}
diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic_private.h b/tools/testing/selftests/kvm/lib/aarch64/gic_private.h
new file mode 100644
index 000000000000..d81d739433dc
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic_private.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) private defines that's only
+ * shared among the GIC library code.
+ */
+
+#ifndef SELFTEST_KVM_GIC_PRIVATE_H
+#define SELFTEST_KVM_GIC_PRIVATE_H
+
+struct gic_common_ops {
+	void (*gic_init)(unsigned int nr_cpus, void *dist_base);
+	void (*gic_cpu_init)(unsigned int cpu, void *redist_base);
+	void (*gic_irq_enable)(unsigned int intid);
+	void (*gic_irq_disable)(unsigned int intid);
+	uint64_t (*gic_read_iar)(void);
+	void (*gic_write_eoir)(uint32_t irq);
+};
+
+extern const struct gic_common_ops gicv3_ops;
+
+#endif /* SELFTEST_KVM_GIC_PRIVATE_H */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
new file mode 100644
index 000000000000..4b635ca6a8cb
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM Generic Interrupt Controller (GIC) v3 support
+ */
+
+#include <linux/sizes.h>
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "delay.h"
+
+#include "gic_v3.h"
+#include "gic_private.h"
+
+struct gicv3_data {
+	void *dist_base;
+	void *redist_base[GICV3_MAX_CPUS];
+	unsigned int nr_cpus;
+	unsigned int nr_spis;
+};
+
+#define sgi_base_from_redist(redist_base) (redist_base + SZ_64K)
+
+enum gicv3_intid_range {
+	SGI_RANGE,
+	PPI_RANGE,
+	SPI_RANGE,
+	INVALID_RANGE,
+};
+
+static struct gicv3_data gicv3_data;
+
+static void gicv3_gicd_wait_for_rwp(void)
+{
+	unsigned int count = 100000; /* 1s */
+
+	while (readl(gicv3_data.dist_base + GICD_CTLR) & GICD_CTLR_RWP) {
+		GUEST_ASSERT(count--);
+		udelay(10);
+	}
+}
+
+static void gicv3_gicr_wait_for_rwp(void *redist_base)
+{
+	unsigned int count = 100000; /* 1s */
+
+	while (readl(redist_base + GICR_CTLR) & GICR_CTLR_RWP) {
+		GUEST_ASSERT(count--);
+		udelay(10);
+	}
+}
+
+static enum gicv3_intid_range get_intid_range(unsigned int intid)
+{
+	switch (intid) {
+	case 0 ... 15:
+		return SGI_RANGE;
+	case 16 ... 31:
+		return PPI_RANGE;
+	case 32 ... 1019:
+		return SPI_RANGE;
+	}
+
+	/* We should not be reaching here */
+	GUEST_ASSERT(0);
+
+	return INVALID_RANGE;
+}
+
+static uint64_t gicv3_read_iar(void)
+{
+	uint64_t irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
+
+	dsb(sy);
+	return irqstat;
+}
+
+static void gicv3_write_eoir(uint32_t irq)
+{
+	write_sysreg_s(SYS_ICC_EOIR1_EL1, irq);
+	isb();
+}
+
+static void
+gicv3_config_irq(unsigned int intid, unsigned int offset)
+{
+	uint32_t cpu = get_vcpuid();
+	uint32_t mask = 1 << (intid % 32);
+	enum gicv3_intid_range intid_range = get_intid_range(intid);
+	void *reg;
+
+	/* We care about 'cpu' only for SGIs or PPIs */
+	if (intid_range == SGI_RANGE || intid_range == PPI_RANGE) {
+		GUEST_ASSERT(cpu < gicv3_data.nr_cpus);
+
+		reg = sgi_base_from_redist(gicv3_data.redist_base[cpu]) +
+			offset;
+		writel(mask, reg);
+		gicv3_gicr_wait_for_rwp(gicv3_data.redist_base[cpu]);
+	} else if (intid_range == SPI_RANGE) {
+		reg = gicv3_data.dist_base + offset + (intid / 32) * 4;
+		writel(mask, reg);
+		gicv3_gicd_wait_for_rwp();
+	} else {
+		GUEST_ASSERT(0);
+	}
+}
+
+static void gicv3_irq_enable(unsigned int intid)
+{
+	gicv3_config_irq(intid, GICD_ISENABLER);
+}
+
+static void gicv3_irq_disable(unsigned int intid)
+{
+	gicv3_config_irq(intid, GICD_ICENABLER);
+}
+
+static void gicv3_enable_redist(void *redist_base)
+{
+	uint32_t val = readl(redist_base + GICR_WAKER);
+	unsigned int count = 100000; /* 1s */
+
+	val &= ~GICR_WAKER_ProcessorSleep;
+	writel(val, redist_base + GICR_WAKER);
+
+	/* Wait until the processor is 'active' */
+	while (readl(redist_base + GICR_WAKER) & GICR_WAKER_ChildrenAsleep) {
+		GUEST_ASSERT(count--);
+		udelay(10);
+	}
+}
+
+static inline void *gicr_base_gpa_cpu(void *redist_base, uint32_t cpu)
+{
+	/* Align all the redistributors sequentially */
+	return redist_base + cpu * SZ_64K * 2;
+}
+
+static void gicv3_cpu_init(unsigned int cpu, void *redist_base)
+{
+	void *sgi_base;
+	unsigned int i;
+	void *redist_base_cpu;
+
+	GUEST_ASSERT(cpu < gicv3_data.nr_cpus);
+
+	redist_base_cpu = gicr_base_gpa_cpu(redist_base, cpu);
+	sgi_base = sgi_base_from_redist(redist_base_cpu);
+
+	gicv3_enable_redist(redist_base_cpu);
+
+	/*
+	 * Mark all the SGI and PPI interrupts as non-secure Group-1.
+	 * Also, deactivate and disable them.
+	 */
+	writel(~0, sgi_base + GICR_IGROUPR0);
+	writel(~0, sgi_base + GICR_ICACTIVER0);
+	writel(~0, sgi_base + GICR_ICENABLER0);
+
+	/* Set a default priority for all the SGIs and PPIs */
+	for (i = 0; i < 32; i += 4)
+		writel(GICD_INT_DEF_PRI_X4,
+				sgi_base + GICR_IPRIORITYR0 + i);
+
+	gicv3_gicr_wait_for_rwp(redist_base_cpu);
+
+	/* Enable the GIC system register (ICC_*) access */
+	write_sysreg_s(SYS_ICC_SRE_EL1,
+			read_sysreg_s(SYS_ICC_SRE_EL1) | ICC_SRE_EL1_SRE);
+
+	/* Set a default priority threshold */
+	write_sysreg_s(SYS_ICC_PMR_EL1, ICC_PMR_DEF_PRIO);
+
+	/* Enable non-secure Group-1 interrupts */
+	write_sysreg_s(SYS_ICC_GRPEN1_EL1, ICC_IGRPEN1_EL1_ENABLE);
+
+	gicv3_data.redist_base[cpu] = redist_base_cpu;
+}
+
+static void gicv3_dist_init(void)
+{
+	void *dist_base = gicv3_data.dist_base;
+	unsigned int i;
+
+	/* Disable the distributor until we set things up */
+	writel(0, dist_base + GICD_CTLR);
+	gicv3_gicd_wait_for_rwp();
+
+	/*
+	 * Mark all the SPI interrupts as non-secure Group-1.
+	 * Also, deactivate and disable them.
+	 */
+	for (i = 32; i < gicv3_data.nr_spis; i += 32) {
+		writel(~0, dist_base + GICD_IGROUPR + i / 8);
+		writel(~0, dist_base + GICD_ICACTIVER + i / 8);
+		writel(~0, dist_base + GICD_ICENABLER + i / 8);
+	}
+
+	/* Set a default priority for all the SPIs */
+	for (i = 32; i < gicv3_data.nr_spis; i += 4)
+		writel(GICD_INT_DEF_PRI_X4,
+				dist_base + GICD_IPRIORITYR + i);
+
+	/* Wait for the settings to sync-in */
+	gicv3_gicd_wait_for_rwp();
+
+	/* Finally, enable the distributor globally with ARE */
+	writel(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A |
+			GICD_CTLR_ENABLE_G1, dist_base + GICD_CTLR);
+	gicv3_gicd_wait_for_rwp();
+}
+
+static void gicv3_init(unsigned int nr_cpus, void *dist_base)
+{
+	GUEST_ASSERT(nr_cpus <= GICV3_MAX_CPUS);
+
+	gicv3_data.nr_cpus = nr_cpus;
+	gicv3_data.dist_base = dist_base;
+	gicv3_data.nr_spis = GICD_TYPER_SPIS(
+				readl(gicv3_data.dist_base + GICD_TYPER));
+	if (gicv3_data.nr_spis > 1020)
+		gicv3_data.nr_spis = 1020;
+
+	/*
+	 * Initialize only the distributor for now.
+	 * The redistributor and CPU interfaces are initialized
+	 * later for every PE.
+	 */
+	gicv3_dist_init();
+}
+
+const struct gic_common_ops gicv3_ops = {
+	.gic_init = gicv3_init,
+	.gic_cpu_init = gicv3_cpu_init,
+	.gic_irq_enable = gicv3_irq_enable,
+	.gic_irq_disable = gicv3_irq_disable,
+	.gic_read_iar = gicv3_read_iar,
+	.gic_write_eoir = gicv3_write_eoir,
+};
diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic_v3.h b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.h
new file mode 100644
index 000000000000..d41195e347b3
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) v3 specific defines
+ */
+
+#ifndef SELFTEST_KVM_GICV3_H
+#define SELFTEST_KVM_GICV3_H
+
+#include "processor.h"
+
+/*
+ * Distributor registers
+ */
+#define GICD_CTLR			0x0000
+#define GICD_TYPER			0x0004
+#define GICD_IGROUPR			0x0080
+#define GICD_ISENABLER			0x0100
+#define GICD_ICENABLER			0x0180
+#define GICD_ICACTIVER			0x0380
+#define GICD_IPRIORITYR			0x0400
+
+/*
+ * The assumption is that the guest runs in a non-secure mode.
+ * The following bits of GICD_CTLR are defined accordingly.
+ */
+#define GICD_CTLR_RWP			(1U << 31)
+#define GICD_CTLR_nASSGIreq		(1U << 8)
+#define GICD_CTLR_ARE_NS		(1U << 4)
+#define GICD_CTLR_ENABLE_G1A		(1U << 1)
+#define GICD_CTLR_ENABLE_G1		(1U << 0)
+
+#define GICD_TYPER_SPIS(typer)		((((typer) & 0x1f) + 1) * 32)
+#define GICD_INT_DEF_PRI_X4		0xa0a0a0a0
+
+/*
+ * Redistributor registers
+ */
+#define GICR_CTLR			0x000
+#define GICR_WAKER			0x014
+
+#define GICR_CTLR_RWP			(1U << 3)
+
+#define GICR_WAKER_ProcessorSleep	(1U << 1)
+#define GICR_WAKER_ChildrenAsleep	(1U << 2)
+
+/*
+ * Redistributor registers, offsets from SGI base
+ */
+#define GICR_IGROUPR0			GICD_IGROUPR
+#define GICR_ISENABLER0			GICD_ISENABLER
+#define GICR_ICENABLER0			GICD_ICENABLER
+#define GICR_ICACTIVER0			GICD_ICACTIVER
+#define GICR_IPRIORITYR0		GICD_IPRIORITYR
+
+/* CPU interface registers */
+#define SYS_ICC_PMR_EL1			sys_reg(3, 0, 4, 6, 0)
+#define SYS_ICC_IAR1_EL1		sys_reg(3, 0, 12, 12, 0)
+#define SYS_ICC_EOIR1_EL1		sys_reg(3, 0, 12, 12, 1)
+#define SYS_ICC_SRE_EL1			sys_reg(3, 0, 12, 12, 5)
+#define SYS_ICC_GRPEN1_EL1		sys_reg(3, 0, 12, 12, 7)
+
+#define ICC_PMR_DEF_PRIO		0xf0
+
+#define ICC_SRE_EL1_SRE			(1U << 0)
+
+#define ICC_IGRPEN1_EL1_ENABLE		(1U << 0)
+
+#define GICV3_MAX_CPUS			512
+
+#endif /* SELFTEST_KVM_GICV3_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 09/10] KVM: arm64: selftests: Add basic GICv3 support

[Raghavendra Rao Ananta]

Add basic support for ARM Generic Interrupt Controller v3.
The support provides guests to setup interrupts.

The work is inspired from kvm-unit-tests and the kernel's
GIC driver (drivers/irqchip/irq-gic-v3.c).

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 tools/testing/selftests/kvm/Makefile          |   2 +-
 .../selftests/kvm/include/aarch64/gic.h       |  21 ++
 tools/testing/selftests/kvm/lib/aarch64/gic.c |  93 +++++++
 .../selftests/kvm/lib/aarch64/gic_private.h   |  21 ++
 .../selftests/kvm/lib/aarch64/gic_v3.c        | 240 ++++++++++++++++++
 .../selftests/kvm/lib/aarch64/gic_v3.h        |  70 +++++
 6 files changed, 446 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/gic.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_private.h
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
 create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.h

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 8f6d82b570bd..a170166334a3 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -35,7 +35,7 @@ endif
 
 LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
 LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
-LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c
+LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c lib/aarch64/gic.c lib/aarch64/gic_v3.c
 LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
 
 TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
diff --git a/tools/testing/selftests/kvm/include/aarch64/gic.h b/tools/testing/selftests/kvm/include/aarch64/gic.h
new file mode 100644
index 000000000000..85dd1e53048e
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/gic.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) specific defines
+ */
+
+#ifndef SELFTEST_KVM_GIC_H
+#define SELFTEST_KVM_GIC_H
+
+enum gic_type {
+	GIC_V3,
+	GIC_TYPE_MAX,
+};
+
+void gic_init(enum gic_type type, unsigned int nr_cpus,
+		void *dist_base, void *redist_base);
+void gic_irq_enable(unsigned int intid);
+void gic_irq_disable(unsigned int intid);
+unsigned int gic_get_and_ack_irq(void);
+void gic_set_eoi(unsigned int intid);
+
+#endif /* SELFTEST_KVM_GIC_H */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic.c b/tools/testing/selftests/kvm/lib/aarch64/gic.c
new file mode 100644
index 000000000000..b0b67f5aeaa6
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM Generic Interrupt Controller (GIC) support
+ */
+
+#include <errno.h>
+#include <linux/bits.h>
+#include <linux/sizes.h>
+
+#include "kvm_util.h"
+
+#include <gic.h>
+#include "gic_private.h"
+#include "processor.h"
+#include "spinlock.h"
+
+static const struct gic_common_ops *gic_common_ops;
+static struct spinlock gic_lock;
+
+static void gic_cpu_init(unsigned int cpu, void *redist_base)
+{
+	gic_common_ops->gic_cpu_init(cpu, redist_base);
+}
+
+static void
+gic_dist_init(enum gic_type type, unsigned int nr_cpus, void *dist_base)
+{
+	const struct gic_common_ops *gic_ops;
+
+	spin_lock(&gic_lock);
+
+	/* Distributor initialization is needed only once per VM */
+	if (gic_common_ops) {
+		spin_unlock(&gic_lock);
+		return;
+	}
+
+	if (type == GIC_V3)
+		gic_ops = &gicv3_ops;
+
+	gic_ops->gic_init(nr_cpus, dist_base);
+	gic_common_ops = gic_ops;
+
+	/* Make sure that the initialized data is visible to all the vCPUs */
+	dsb(sy);
+
+	spin_unlock(&gic_lock);
+}
+
+void gic_init(enum gic_type type, unsigned int nr_cpus,
+		void *dist_base, void *redist_base)
+{
+	uint32_t cpu = get_vcpuid();
+
+	GUEST_ASSERT(type < GIC_TYPE_MAX);
+	GUEST_ASSERT(dist_base);
+	GUEST_ASSERT(redist_base);
+	GUEST_ASSERT(nr_cpus);
+
+	gic_dist_init(type, nr_cpus, dist_base);
+	gic_cpu_init(cpu, redist_base);
+}
+
+void gic_irq_enable(unsigned int intid)
+{
+	GUEST_ASSERT(gic_common_ops);
+	gic_common_ops->gic_irq_enable(intid);
+}
+
+void gic_irq_disable(unsigned int intid)
+{
+	GUEST_ASSERT(gic_common_ops);
+	gic_common_ops->gic_irq_disable(intid);
+}
+
+unsigned int gic_get_and_ack_irq(void)
+{
+	uint64_t irqstat;
+	unsigned int intid;
+
+	GUEST_ASSERT(gic_common_ops);
+
+	irqstat = gic_common_ops->gic_read_iar();
+	intid = irqstat & GENMASK(23, 0);
+
+	return intid;
+}
+
+void gic_set_eoi(unsigned int intid)
+{
+	GUEST_ASSERT(gic_common_ops);
+	gic_common_ops->gic_write_eoir(intid);
+}
diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic_private.h b/tools/testing/selftests/kvm/lib/aarch64/gic_private.h
new file mode 100644
index 000000000000..d81d739433dc
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic_private.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) private defines that's only
+ * shared among the GIC library code.
+ */
+
+#ifndef SELFTEST_KVM_GIC_PRIVATE_H
+#define SELFTEST_KVM_GIC_PRIVATE_H
+
+struct gic_common_ops {
+	void (*gic_init)(unsigned int nr_cpus, void *dist_base);
+	void (*gic_cpu_init)(unsigned int cpu, void *redist_base);
+	void (*gic_irq_enable)(unsigned int intid);
+	void (*gic_irq_disable)(unsigned int intid);
+	uint64_t (*gic_read_iar)(void);
+	void (*gic_write_eoir)(uint32_t irq);
+};
+
+extern const struct gic_common_ops gicv3_ops;
+
+#endif /* SELFTEST_KVM_GIC_PRIVATE_H */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
new file mode 100644
index 000000000000..4b635ca6a8cb
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM Generic Interrupt Controller (GIC) v3 support
+ */
+
+#include <linux/sizes.h>
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "delay.h"
+
+#include "gic_v3.h"
+#include "gic_private.h"
+
+struct gicv3_data {
+	void *dist_base;
+	void *redist_base[GICV3_MAX_CPUS];
+	unsigned int nr_cpus;
+	unsigned int nr_spis;
+};
+
+#define sgi_base_from_redist(redist_base) (redist_base + SZ_64K)
+
+enum gicv3_intid_range {
+	SGI_RANGE,
+	PPI_RANGE,
+	SPI_RANGE,
+	INVALID_RANGE,
+};
+
+static struct gicv3_data gicv3_data;
+
+static void gicv3_gicd_wait_for_rwp(void)
+{
+	unsigned int count = 100000; /* 1s */
+
+	while (readl(gicv3_data.dist_base + GICD_CTLR) & GICD_CTLR_RWP) {
+		GUEST_ASSERT(count--);
+		udelay(10);
+	}
+}
+
+static void gicv3_gicr_wait_for_rwp(void *redist_base)
+{
+	unsigned int count = 100000; /* 1s */
+
+	while (readl(redist_base + GICR_CTLR) & GICR_CTLR_RWP) {
+		GUEST_ASSERT(count--);
+		udelay(10);
+	}
+}
+
+static enum gicv3_intid_range get_intid_range(unsigned int intid)
+{
+	switch (intid) {
+	case 0 ... 15:
+		return SGI_RANGE;
+	case 16 ... 31:
+		return PPI_RANGE;
+	case 32 ... 1019:
+		return SPI_RANGE;
+	}
+
+	/* We should not be reaching here */
+	GUEST_ASSERT(0);
+
+	return INVALID_RANGE;
+}
+
+static uint64_t gicv3_read_iar(void)
+{
+	uint64_t irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
+
+	dsb(sy);
+	return irqstat;
+}
+
+static void gicv3_write_eoir(uint32_t irq)
+{
+	write_sysreg_s(SYS_ICC_EOIR1_EL1, irq);
+	isb();
+}
+
+static void
+gicv3_config_irq(unsigned int intid, unsigned int offset)
+{
+	uint32_t cpu = get_vcpuid();
+	uint32_t mask = 1 << (intid % 32);
+	enum gicv3_intid_range intid_range = get_intid_range(intid);
+	void *reg;
+
+	/* We care about 'cpu' only for SGIs or PPIs */
+	if (intid_range == SGI_RANGE || intid_range == PPI_RANGE) {
+		GUEST_ASSERT(cpu < gicv3_data.nr_cpus);
+
+		reg = sgi_base_from_redist(gicv3_data.redist_base[cpu]) +
+			offset;
+		writel(mask, reg);
+		gicv3_gicr_wait_for_rwp(gicv3_data.redist_base[cpu]);
+	} else if (intid_range == SPI_RANGE) {
+		reg = gicv3_data.dist_base + offset + (intid / 32) * 4;
+		writel(mask, reg);
+		gicv3_gicd_wait_for_rwp();
+	} else {
+		GUEST_ASSERT(0);
+	}
+}
+
+static void gicv3_irq_enable(unsigned int intid)
+{
+	gicv3_config_irq(intid, GICD_ISENABLER);
+}
+
+static void gicv3_irq_disable(unsigned int intid)
+{
+	gicv3_config_irq(intid, GICD_ICENABLER);
+}
+
+static void gicv3_enable_redist(void *redist_base)
+{
+	uint32_t val = readl(redist_base + GICR_WAKER);
+	unsigned int count = 100000; /* 1s */
+
+	val &= ~GICR_WAKER_ProcessorSleep;
+	writel(val, redist_base + GICR_WAKER);
+
+	/* Wait until the processor is 'active' */
+	while (readl(redist_base + GICR_WAKER) & GICR_WAKER_ChildrenAsleep) {
+		GUEST_ASSERT(count--);
+		udelay(10);
+	}
+}
+
+static inline void *gicr_base_gpa_cpu(void *redist_base, uint32_t cpu)
+{
+	/* Align all the redistributors sequentially */
+	return redist_base + cpu * SZ_64K * 2;
+}
+
+static void gicv3_cpu_init(unsigned int cpu, void *redist_base)
+{
+	void *sgi_base;
+	unsigned int i;
+	void *redist_base_cpu;
+
+	GUEST_ASSERT(cpu < gicv3_data.nr_cpus);
+
+	redist_base_cpu = gicr_base_gpa_cpu(redist_base, cpu);
+	sgi_base = sgi_base_from_redist(redist_base_cpu);
+
+	gicv3_enable_redist(redist_base_cpu);
+
+	/*
+	 * Mark all the SGI and PPI interrupts as non-secure Group-1.
+	 * Also, deactivate and disable them.
+	 */
+	writel(~0, sgi_base + GICR_IGROUPR0);
+	writel(~0, sgi_base + GICR_ICACTIVER0);
+	writel(~0, sgi_base + GICR_ICENABLER0);
+
+	/* Set a default priority for all the SGIs and PPIs */
+	for (i = 0; i < 32; i += 4)
+		writel(GICD_INT_DEF_PRI_X4,
+				sgi_base + GICR_IPRIORITYR0 + i);
+
+	gicv3_gicr_wait_for_rwp(redist_base_cpu);
+
+	/* Enable the GIC system register (ICC_*) access */
+	write_sysreg_s(SYS_ICC_SRE_EL1,
+			read_sysreg_s(SYS_ICC_SRE_EL1) | ICC_SRE_EL1_SRE);
+
+	/* Set a default priority threshold */
+	write_sysreg_s(SYS_ICC_PMR_EL1, ICC_PMR_DEF_PRIO);
+
+	/* Enable non-secure Group-1 interrupts */
+	write_sysreg_s(SYS_ICC_GRPEN1_EL1, ICC_IGRPEN1_EL1_ENABLE);
+
+	gicv3_data.redist_base[cpu] = redist_base_cpu;
+}
+
+static void gicv3_dist_init(void)
+{
+	void *dist_base = gicv3_data.dist_base;
+	unsigned int i;
+
+	/* Disable the distributor until we set things up */
+	writel(0, dist_base + GICD_CTLR);
+	gicv3_gicd_wait_for_rwp();
+
+	/*
+	 * Mark all the SPI interrupts as non-secure Group-1.
+	 * Also, deactivate and disable them.
+	 */
+	for (i = 32; i < gicv3_data.nr_spis; i += 32) {
+		writel(~0, dist_base + GICD_IGROUPR + i / 8);
+		writel(~0, dist_base + GICD_ICACTIVER + i / 8);
+		writel(~0, dist_base + GICD_ICENABLER + i / 8);
+	}
+
+	/* Set a default priority for all the SPIs */
+	for (i = 32; i < gicv3_data.nr_spis; i += 4)
+		writel(GICD_INT_DEF_PRI_X4,
+				dist_base + GICD_IPRIORITYR + i);
+
+	/* Wait for the settings to sync-in */
+	gicv3_gicd_wait_for_rwp();
+
+	/* Finally, enable the distributor globally with ARE */
+	writel(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A |
+			GICD_CTLR_ENABLE_G1, dist_base + GICD_CTLR);
+	gicv3_gicd_wait_for_rwp();
+}
+
+static void gicv3_init(unsigned int nr_cpus, void *dist_base)
+{
+	GUEST_ASSERT(nr_cpus <= GICV3_MAX_CPUS);
+
+	gicv3_data.nr_cpus = nr_cpus;
+	gicv3_data.dist_base = dist_base;
+	gicv3_data.nr_spis = GICD_TYPER_SPIS(
+				readl(gicv3_data.dist_base + GICD_TYPER));
+	if (gicv3_data.nr_spis > 1020)
+		gicv3_data.nr_spis = 1020;
+
+	/*
+	 * Initialize only the distributor for now.
+	 * The redistributor and CPU interfaces are initialized
+	 * later for every PE.
+	 */
+	gicv3_dist_init();
+}
+
+const struct gic_common_ops gicv3_ops = {
+	.gic_init = gicv3_init,
+	.gic_cpu_init = gicv3_cpu_init,
+	.gic_irq_enable = gicv3_irq_enable,
+	.gic_irq_disable = gicv3_irq_disable,
+	.gic_read_iar = gicv3_read_iar,
+	.gic_write_eoir = gicv3_write_eoir,
+};
diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic_v3.h b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.h
new file mode 100644
index 000000000000..d41195e347b3
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) v3 specific defines
+ */
+
+#ifndef SELFTEST_KVM_GICV3_H
+#define SELFTEST_KVM_GICV3_H
+
+#include "processor.h"
+
+/*
+ * Distributor registers
+ */
+#define GICD_CTLR			0x0000
+#define GICD_TYPER			0x0004
+#define GICD_IGROUPR			0x0080
+#define GICD_ISENABLER			0x0100
+#define GICD_ICENABLER			0x0180
+#define GICD_ICACTIVER			0x0380
+#define GICD_IPRIORITYR			0x0400
+
+/*
+ * The assumption is that the guest runs in a non-secure mode.
+ * The following bits of GICD_CTLR are defined accordingly.
+ */
+#define GICD_CTLR_RWP			(1U << 31)
+#define GICD_CTLR_nASSGIreq		(1U << 8)
+#define GICD_CTLR_ARE_NS		(1U << 4)
+#define GICD_CTLR_ENABLE_G1A		(1U << 1)
+#define GICD_CTLR_ENABLE_G1		(1U << 0)
+
+#define GICD_TYPER_SPIS(typer)		((((typer) & 0x1f) + 1) * 32)
+#define GICD_INT_DEF_PRI_X4		0xa0a0a0a0
+
+/*
+ * Redistributor registers
+ */
+#define GICR_CTLR			0x000
+#define GICR_WAKER			0x014
+
+#define GICR_CTLR_RWP			(1U << 3)
+
+#define GICR_WAKER_ProcessorSleep	(1U << 1)
+#define GICR_WAKER_ChildrenAsleep	(1U << 2)
+
+/*
+ * Redistributor registers, offsets from SGI base
+ */
+#define GICR_IGROUPR0			GICD_IGROUPR
+#define GICR_ISENABLER0			GICD_ISENABLER
+#define GICR_ICENABLER0			GICD_ICENABLER
+#define GICR_ICACTIVER0			GICD_ICACTIVER
+#define GICR_IPRIORITYR0		GICD_IPRIORITYR
+
+/* CPU interface registers */
+#define SYS_ICC_PMR_EL1			sys_reg(3, 0, 4, 6, 0)
+#define SYS_ICC_IAR1_EL1		sys_reg(3, 0, 12, 12, 0)
+#define SYS_ICC_EOIR1_EL1		sys_reg(3, 0, 12, 12, 1)
+#define SYS_ICC_SRE_EL1			sys_reg(3, 0, 12, 12, 5)
+#define SYS_ICC_GRPEN1_EL1		sys_reg(3, 0, 12, 12, 7)
+
+#define ICC_PMR_DEF_PRIO		0xf0
+
+#define ICC_SRE_EL1_SRE			(1U << 0)
+
+#define ICC_IGRPEN1_EL1_ENABLE		(1U << 0)
+
+#define GICV3_MAX_CPUS			512
+
+#endif /* SELFTEST_KVM_GICV3_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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[PATCH 10/10] KVM: arm64: selftests: Add arch_timer test

[Raghavendra Rao Ananta]

Add a KVM selftest to validate the arch_timer functionality.
Primarily, the test sets up periodic timer interrupts and
validates the basic architectural expectations upon its receipt.

The test provides command-line options to configure the period
of the timer, number of iterations, and number of vCPUs.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../selftests/kvm/aarch64/arch_timer.c        | 382 ++++++++++++++++++
 3 files changed, 384 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/aarch64/arch_timer.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 0709af0144c8..5f6cf0c76cf8 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
+/aarch64/arch_timer
 /aarch64/debug-exceptions
 /aarch64/get-reg-list
 /aarch64/vgic_init
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index a170166334a3..62a2c3e4b50c 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -84,6 +84,7 @@ TEST_GEN_PROGS_x86_64 += set_memory_region_test
 TEST_GEN_PROGS_x86_64 += steal_time
 TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test
 
+TEST_GEN_PROGS_aarch64 += aarch64/arch_timer
 TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
 TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
 TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
new file mode 100644
index 000000000000..88333fe1e567
--- /dev/null
+++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
@@ -0,0 +1,382 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch_timer.c - Tests the aarch64 timer IRQ functionality
+ *
+ * The test validates both the virtual and physical timer IRQs using
+ * CVAL and TVAL registers. This consitutes the four stages in the test.
+ * The guest's main thread configures the timer interrupt for a stage
+ * and waits for it to fire, with a timeout equal to the timer period.
+ * It asserts that the timeout doesn't exceed the timer period.
+ *
+ * On the other hand, upon receipt of an interrupt, the guest's interrupt
+ * handler validates the interrupt by checking if the architectural state
+ * is in compliance with the specifications.
+ *
+ * The test provides command-line options to configure the timer's
+ * period (-p), number of vCPUs (-n), and iterations per stage (-i).
+ *
+ * Copyright (c) 2021, Google LLC.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <pthread.h>
+#include <linux/kvm.h>
+#include <linux/sizes.h>
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "delay.h"
+#include "arch_timer.h"
+#include "gic.h"
+
+#define NR_VCPUS_DEF			4
+#define NR_TEST_ITERS_DEF		5
+#define TIMER_TEST_PERIOD_MS_DEF	10
+#define TIMER_TEST_ERR_MARGIN_US	100
+
+struct test_args {
+	int nr_vcpus;
+	int nr_iter;
+	int timer_period_ms;
+};
+
+static struct test_args test_args = {
+	.nr_vcpus = NR_VCPUS_DEF,
+	.nr_iter = NR_TEST_ITERS_DEF,
+	.timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
+};
+
+#define msecs_to_usecs(msec)		((msec) * 1000LL)
+
+#define VTIMER_IRQ			27
+#define PTIMER_IRQ			30
+
+#define REDIST_REGION_ATTR_ADDR(count, base, flags, index) \
+	(((uint64_t)(count) << 52) | \
+	((uint64_t)((base) >> 16) << 16) | \
+	((uint64_t)(flags) << 12) | \
+	index)
+
+#define GICD_BASE_GPA			0x8000000ULL
+#define GICR_BASE_GPA			0x80A0000ULL
+
+enum guest_stage {
+	GUEST_STAGE_VTIMER_CVAL = 1,
+	GUEST_STAGE_VTIMER_TVAL,
+	GUEST_STAGE_PTIMER_CVAL,
+	GUEST_STAGE_PTIMER_TVAL,
+	GUEST_STAGE_MAX,
+};
+
+/* Sahred variables between host and guest */
+struct test_vcpu_shared_data {
+	int nr_iter;
+	enum guest_stage guest_stage;
+	uint64_t xcnt;
+};
+
+struct test_vcpu {
+	uint32_t vcpuid;
+	pthread_t pt_vcpu_run;
+	struct kvm_vm *vm;
+};
+
+static struct test_vcpu test_vcpu[KVM_MAX_VCPUS];
+static struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
+
+static void
+guest_configure_timer_action(struct test_vcpu_shared_data *shared_data)
+{
+	switch (shared_data->guest_stage) {
+	case GUEST_STAGE_VTIMER_CVAL:
+		timer_set_next_cval_ms(VIRTUAL, test_args.timer_period_ms);
+		shared_data->xcnt = timer_get_cntct(VIRTUAL);
+		timer_set_ctl(VIRTUAL, CTL_ENABLE);
+		break;
+	case GUEST_STAGE_VTIMER_TVAL:
+		timer_set_next_tval_ms(VIRTUAL, test_args.timer_period_ms);
+		shared_data->xcnt = timer_get_cntct(VIRTUAL);
+		timer_set_ctl(VIRTUAL, CTL_ENABLE);
+		break;
+	case GUEST_STAGE_PTIMER_CVAL:
+		timer_set_next_cval_ms(PHYSICAL, test_args.timer_period_ms);
+		shared_data->xcnt = timer_get_cntct(PHYSICAL);
+		timer_set_ctl(PHYSICAL, CTL_ENABLE);
+		break;
+	case GUEST_STAGE_PTIMER_TVAL:
+		timer_set_next_tval_ms(PHYSICAL, test_args.timer_period_ms);
+		shared_data->xcnt = timer_get_cntct(PHYSICAL);
+		timer_set_ctl(PHYSICAL, CTL_ENABLE);
+		break;
+	default:
+		GUEST_ASSERT(0);
+	}
+}
+
+static void guest_validate_irq(unsigned int intid,
+				struct test_vcpu_shared_data *shared_data)
+{
+	enum guest_stage stage = shared_data->guest_stage;
+	uint64_t xcnt = 0, xcnt_diff_us, cval = 0;
+	unsigned long xctl = 0;
+	unsigned int timer_irq = 0;
+
+	if (stage == GUEST_STAGE_VTIMER_CVAL ||
+		stage == GUEST_STAGE_VTIMER_TVAL) {
+		xctl = timer_get_ctl(VIRTUAL);
+		timer_set_ctl(VIRTUAL, CTL_IMASK);
+		xcnt = timer_get_cntct(VIRTUAL);
+		cval = timer_get_cval(VIRTUAL);
+		timer_irq = VTIMER_IRQ;
+	} else if (stage == GUEST_STAGE_PTIMER_CVAL ||
+		stage == GUEST_STAGE_PTIMER_TVAL) {
+		xctl = timer_get_ctl(PHYSICAL);
+		timer_set_ctl(PHYSICAL, CTL_IMASK);
+		xcnt = timer_get_cntct(PHYSICAL);
+		cval = timer_get_cval(PHYSICAL);
+		timer_irq = PTIMER_IRQ;
+	} else {
+		GUEST_ASSERT(0);
+	}
+
+	xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt);
+
+	/* Make sure we are dealing with the correct timer IRQ */
+	GUEST_ASSERT_2(intid == timer_irq, intid, timer_irq);
+
+	/* Basic 'timer codition met' check */
+	GUEST_ASSERT_3(xcnt >= cval, xcnt, cval, xcnt_diff_us);
+	GUEST_ASSERT_1(xctl & CTL_ISTATUS, xctl);
+}
+
+static void guest_irq_handler(struct ex_regs *regs)
+{
+	unsigned int intid = gic_get_and_ack_irq();
+	uint32_t cpu = get_vcpuid();
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+	guest_validate_irq(intid, shared_data);
+
+	WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1);
+
+	gic_set_eoi(intid);
+}
+
+static void guest_run_stage(struct test_vcpu_shared_data *shared_data,
+				enum guest_stage stage)
+{
+	uint32_t irq_iter, config_iter;
+
+	shared_data->guest_stage = stage;
+	shared_data->nr_iter = 0;
+
+	for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
+		/* Setup the next interrupt */
+		guest_configure_timer_action(shared_data);
+
+		/* Setup a timeout for the interrupt to arrive */
+		udelay(msecs_to_usecs(test_args.timer_period_ms) +
+			TIMER_TEST_ERR_MARGIN_US);
+
+		irq_iter = READ_ONCE(shared_data->nr_iter);
+		GUEST_ASSERT_2(config_iter + 1 == irq_iter,
+				config_iter + 1, irq_iter);
+	};
+}
+
+static void guest_code(void)
+{
+	uint32_t cpu = get_vcpuid();
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+	local_irq_disable();
+
+	gic_init(GIC_V3, test_args.nr_vcpus,
+		(void *)GICD_BASE_GPA, (void *)GICR_BASE_GPA);
+
+	timer_set_ctl(VIRTUAL, CTL_IMASK);
+	timer_set_ctl(PHYSICAL, CTL_IMASK);
+
+	gic_irq_enable(VTIMER_IRQ);
+	gic_irq_enable(PTIMER_IRQ);
+	local_irq_enable();
+
+	guest_run_stage(shared_data, GUEST_STAGE_VTIMER_CVAL);
+	guest_run_stage(shared_data, GUEST_STAGE_VTIMER_TVAL);
+	guest_run_stage(shared_data, GUEST_STAGE_PTIMER_CVAL);
+	guest_run_stage(shared_data, GUEST_STAGE_PTIMER_TVAL);
+
+	GUEST_DONE();
+}
+
+static void *test_vcpu_run(void *arg)
+{
+	struct ucall uc;
+	struct test_vcpu *vcpu = arg;
+	struct kvm_vm *vm = vcpu->vm;
+	uint32_t vcpuid = vcpu->vcpuid;
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpuid];
+
+	vcpu_run(vm, vcpuid);
+
+	switch (get_ucall(vm, vcpuid, &uc)) {
+	case UCALL_SYNC:
+	case UCALL_DONE:
+		break;
+	case UCALL_ABORT:
+		sync_global_from_guest(vm, *shared_data);
+		TEST_ASSERT(false,
+			"%s at %s:%ld\n\tvalues: %lu, %lu; %lu, vcpu: %u; stage: %u; iter: %u",
+			(const char *)uc.args[0], __FILE__, uc.args[1],
+			uc.args[2], uc.args[3], uc.args[4], vcpuid,
+			shared_data->guest_stage, shared_data->nr_iter);
+		break;
+	default:
+		TEST_FAIL("Unexpected guest exit\n");
+	}
+
+	return NULL;
+}
+
+static void test_run(struct kvm_vm *vm)
+{
+	int i, ret;
+
+	for (i = 0; i < test_args.nr_vcpus; i++) {
+		ret = pthread_create(&test_vcpu[i].pt_vcpu_run, NULL,
+				test_vcpu_run, &test_vcpu[i]);
+		TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
+	}
+
+	for (i = 0; i < test_args.nr_vcpus; i++)
+		pthread_join(test_vcpu[i].pt_vcpu_run, NULL);
+}
+
+static void test_vm_setup_gic(struct kvm_vm *vm, unsigned int n_gicr_pages)
+{
+	uint64_t addr;
+	int gic_fd;
+
+	gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
+
+	addr = GICD_BASE_GPA;
+	kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+				KVM_VGIC_V3_ADDR_TYPE_DIST, &addr, true);
+	virt_pg_map(vm, GICD_BASE_GPA, GICD_BASE_GPA);
+
+	addr = REDIST_REGION_ATTR_ADDR(test_args.nr_vcpus, GICR_BASE_GPA, 0, 0);
+	kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+			KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
+	virt_map(vm, GICR_BASE_GPA, GICR_BASE_GPA, n_gicr_pages);
+
+	kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
+				KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
+}
+
+static struct kvm_vm *test_vm_create(void)
+{
+	struct kvm_vm *vm;
+	unsigned int i, n_gicr_pages;
+	int nr_vcpus = test_args.nr_vcpus;
+
+	/* Reserve additional pages for GICR MMIO based on nr_vcpus */
+	n_gicr_pages = vm_calc_num_guest_pages(VM_MODE_DEFAULT,
+						2 * SZ_64K * nr_vcpus);
+
+	vm = vm_create_default_with_vcpus(nr_vcpus, n_gicr_pages, 0,
+						guest_code, NULL);
+
+	vm_init_descriptor_tables(vm);
+	vm_install_exception_handler(vm, VECTOR_IRQ_CURRENT, guest_irq_handler);
+
+	for (i = 0; i < nr_vcpus; i++) {
+		vcpu_init_descriptor_tables(vm, i);
+
+		test_vcpu[i].vcpuid = i;
+		test_vcpu[i].vm = vm;
+	}
+
+	ucall_init(vm, NULL);
+	test_vm_setup_gic(vm, n_gicr_pages);
+
+	/* Make all the test's cmdline args visible to the guest */
+	sync_global_to_guest(vm, test_args);
+
+	return vm;
+}
+
+static void test_print_help(char *name)
+{
+	pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
+		name);
+	pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
+		NR_VCPUS_DEF, KVM_MAX_VCPUS);
+	pr_info("\t-i: Number of iterations per stage (default: %u)\n",
+		NR_TEST_ITERS_DEF);
+	pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
+		TIMER_TEST_PERIOD_MS_DEF);
+	pr_info("\t-h: print this help screen\n");
+}
+
+static bool parse_args(int argc, char *argv[])
+{
+	int opt;
+
+	while ((opt = getopt(argc, argv, "hn:i:p:")) != -1) {
+		switch (opt) {
+		case 'n':
+			test_args.nr_vcpus = atoi(optarg);
+			if (test_args.nr_vcpus <= 0) {
+				pr_info("Positive value needed for -n\n");
+				goto err;
+			} else if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
+				pr_info("Max allowed vCPUs: %u\n",
+					KVM_MAX_VCPUS);
+				goto err;
+			}
+			break;
+		case 'i':
+			test_args.nr_iter = atoi(optarg);
+			if (test_args.nr_iter <= 0) {
+				pr_info("Positive value needed for -i\n");
+				goto err;
+			}
+			break;
+		case 'p':
+			test_args.timer_period_ms = atoi(optarg);
+			if (test_args.timer_period_ms <= 0) {
+				pr_info("Positive value needed for -p\n");
+				goto err;
+			}
+			break;
+		case 'h':
+		default:
+			goto err;
+		}
+	}
+
+	return true;
+
+err:
+	test_print_help(argv[0]);
+	return false;
+}
+
+int main(int argc, char *argv[])
+{
+	struct kvm_vm *vm;
+
+	/* Tell stdout not to buffer its content */
+	setbuf(stdout, NULL);
+
+	if (!parse_args(argc, argv))
+		exit(KSFT_SKIP);
+
+	vm = test_vm_create();
+	test_run(vm);
+	kvm_vm_free(vm);
+
+	return 0;
+}
-- 
2.33.0.rc1.237.g0d66db33f3-goog

[PATCH 10/10] KVM: arm64: selftests: Add arch_timer test

[Raghavendra Rao Ananta]

Add a KVM selftest to validate the arch_timer functionality.
Primarily, the test sets up periodic timer interrupts and
validates the basic architectural expectations upon its receipt.

The test provides command-line options to configure the period
of the timer, number of iterations, and number of vCPUs.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../selftests/kvm/aarch64/arch_timer.c        | 382 ++++++++++++++++++
 3 files changed, 384 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/aarch64/arch_timer.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 0709af0144c8..5f6cf0c76cf8 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
+/aarch64/arch_timer
 /aarch64/debug-exceptions
 /aarch64/get-reg-list
 /aarch64/vgic_init
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index a170166334a3..62a2c3e4b50c 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -84,6 +84,7 @@ TEST_GEN_PROGS_x86_64 += set_memory_region_test
 TEST_GEN_PROGS_x86_64 += steal_time
 TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test
 
+TEST_GEN_PROGS_aarch64 += aarch64/arch_timer
 TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
 TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
 TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
new file mode 100644
index 000000000000..88333fe1e567
--- /dev/null
+++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
@@ -0,0 +1,382 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch_timer.c - Tests the aarch64 timer IRQ functionality
+ *
+ * The test validates both the virtual and physical timer IRQs using
+ * CVAL and TVAL registers. This consitutes the four stages in the test.
+ * The guest's main thread configures the timer interrupt for a stage
+ * and waits for it to fire, with a timeout equal to the timer period.
+ * It asserts that the timeout doesn't exceed the timer period.
+ *
+ * On the other hand, upon receipt of an interrupt, the guest's interrupt
+ * handler validates the interrupt by checking if the architectural state
+ * is in compliance with the specifications.
+ *
+ * The test provides command-line options to configure the timer's
+ * period (-p), number of vCPUs (-n), and iterations per stage (-i).
+ *
+ * Copyright (c) 2021, Google LLC.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <pthread.h>
+#include <linux/kvm.h>
+#include <linux/sizes.h>
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "delay.h"
+#include "arch_timer.h"
+#include "gic.h"
+
+#define NR_VCPUS_DEF			4
+#define NR_TEST_ITERS_DEF		5
+#define TIMER_TEST_PERIOD_MS_DEF	10
+#define TIMER_TEST_ERR_MARGIN_US	100
+
+struct test_args {
+	int nr_vcpus;
+	int nr_iter;
+	int timer_period_ms;
+};
+
+static struct test_args test_args = {
+	.nr_vcpus = NR_VCPUS_DEF,
+	.nr_iter = NR_TEST_ITERS_DEF,
+	.timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
+};
+
+#define msecs_to_usecs(msec)		((msec) * 1000LL)
+
+#define VTIMER_IRQ			27
+#define PTIMER_IRQ			30
+
+#define REDIST_REGION_ATTR_ADDR(count, base, flags, index) \
+	(((uint64_t)(count) << 52) | \
+	((uint64_t)((base) >> 16) << 16) | \
+	((uint64_t)(flags) << 12) | \
+	index)
+
+#define GICD_BASE_GPA			0x8000000ULL
+#define GICR_BASE_GPA			0x80A0000ULL
+
+enum guest_stage {
+	GUEST_STAGE_VTIMER_CVAL = 1,
+	GUEST_STAGE_VTIMER_TVAL,
+	GUEST_STAGE_PTIMER_CVAL,
+	GUEST_STAGE_PTIMER_TVAL,
+	GUEST_STAGE_MAX,
+};
+
+/* Sahred variables between host and guest */
+struct test_vcpu_shared_data {
+	int nr_iter;
+	enum guest_stage guest_stage;
+	uint64_t xcnt;
+};
+
+struct test_vcpu {
+	uint32_t vcpuid;
+	pthread_t pt_vcpu_run;
+	struct kvm_vm *vm;
+};
+
+static struct test_vcpu test_vcpu[KVM_MAX_VCPUS];
+static struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
+
+static void
+guest_configure_timer_action(struct test_vcpu_shared_data *shared_data)
+{
+	switch (shared_data->guest_stage) {
+	case GUEST_STAGE_VTIMER_CVAL:
+		timer_set_next_cval_ms(VIRTUAL, test_args.timer_period_ms);
+		shared_data->xcnt = timer_get_cntct(VIRTUAL);
+		timer_set_ctl(VIRTUAL, CTL_ENABLE);
+		break;
+	case GUEST_STAGE_VTIMER_TVAL:
+		timer_set_next_tval_ms(VIRTUAL, test_args.timer_period_ms);
+		shared_data->xcnt = timer_get_cntct(VIRTUAL);
+		timer_set_ctl(VIRTUAL, CTL_ENABLE);
+		break;
+	case GUEST_STAGE_PTIMER_CVAL:
+		timer_set_next_cval_ms(PHYSICAL, test_args.timer_period_ms);
+		shared_data->xcnt = timer_get_cntct(PHYSICAL);
+		timer_set_ctl(PHYSICAL, CTL_ENABLE);
+		break;
+	case GUEST_STAGE_PTIMER_TVAL:
+		timer_set_next_tval_ms(PHYSICAL, test_args.timer_period_ms);
+		shared_data->xcnt = timer_get_cntct(PHYSICAL);
+		timer_set_ctl(PHYSICAL, CTL_ENABLE);
+		break;
+	default:
+		GUEST_ASSERT(0);
+	}
+}
+
+static void guest_validate_irq(unsigned int intid,
+				struct test_vcpu_shared_data *shared_data)
+{
+	enum guest_stage stage = shared_data->guest_stage;
+	uint64_t xcnt = 0, xcnt_diff_us, cval = 0;
+	unsigned long xctl = 0;
+	unsigned int timer_irq = 0;
+
+	if (stage == GUEST_STAGE_VTIMER_CVAL ||
+		stage == GUEST_STAGE_VTIMER_TVAL) {
+		xctl = timer_get_ctl(VIRTUAL);
+		timer_set_ctl(VIRTUAL, CTL_IMASK);
+		xcnt = timer_get_cntct(VIRTUAL);
+		cval = timer_get_cval(VIRTUAL);
+		timer_irq = VTIMER_IRQ;
+	} else if (stage == GUEST_STAGE_PTIMER_CVAL ||
+		stage == GUEST_STAGE_PTIMER_TVAL) {
+		xctl = timer_get_ctl(PHYSICAL);
+		timer_set_ctl(PHYSICAL, CTL_IMASK);
+		xcnt = timer_get_cntct(PHYSICAL);
+		cval = timer_get_cval(PHYSICAL);
+		timer_irq = PTIMER_IRQ;
+	} else {
+		GUEST_ASSERT(0);
+	}
+
+	xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt);
+
+	/* Make sure we are dealing with the correct timer IRQ */
+	GUEST_ASSERT_2(intid == timer_irq, intid, timer_irq);
+
+	/* Basic 'timer codition met' check */
+	GUEST_ASSERT_3(xcnt >= cval, xcnt, cval, xcnt_diff_us);
+	GUEST_ASSERT_1(xctl & CTL_ISTATUS, xctl);
+}
+
+static void guest_irq_handler(struct ex_regs *regs)
+{
+	unsigned int intid = gic_get_and_ack_irq();
+	uint32_t cpu = get_vcpuid();
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+	guest_validate_irq(intid, shared_data);
+
+	WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1);
+
+	gic_set_eoi(intid);
+}
+
+static void guest_run_stage(struct test_vcpu_shared_data *shared_data,
+				enum guest_stage stage)
+{
+	uint32_t irq_iter, config_iter;
+
+	shared_data->guest_stage = stage;
+	shared_data->nr_iter = 0;
+
+	for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
+		/* Setup the next interrupt */
+		guest_configure_timer_action(shared_data);
+
+		/* Setup a timeout for the interrupt to arrive */
+		udelay(msecs_to_usecs(test_args.timer_period_ms) +
+			TIMER_TEST_ERR_MARGIN_US);
+
+		irq_iter = READ_ONCE(shared_data->nr_iter);
+		GUEST_ASSERT_2(config_iter + 1 == irq_iter,
+				config_iter + 1, irq_iter);
+	};
+}
+
+static void guest_code(void)
+{
+	uint32_t cpu = get_vcpuid();
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+	local_irq_disable();
+
+	gic_init(GIC_V3, test_args.nr_vcpus,
+		(void *)GICD_BASE_GPA, (void *)GICR_BASE_GPA);
+
+	timer_set_ctl(VIRTUAL, CTL_IMASK);
+	timer_set_ctl(PHYSICAL, CTL_IMASK);
+
+	gic_irq_enable(VTIMER_IRQ);
+	gic_irq_enable(PTIMER_IRQ);
+	local_irq_enable();
+
+	guest_run_stage(shared_data, GUEST_STAGE_VTIMER_CVAL);
+	guest_run_stage(shared_data, GUEST_STAGE_VTIMER_TVAL);
+	guest_run_stage(shared_data, GUEST_STAGE_PTIMER_CVAL);
+	guest_run_stage(shared_data, GUEST_STAGE_PTIMER_TVAL);
+
+	GUEST_DONE();
+}
+
+static void *test_vcpu_run(void *arg)
+{
+	struct ucall uc;
+	struct test_vcpu *vcpu = arg;
+	struct kvm_vm *vm = vcpu->vm;
+	uint32_t vcpuid = vcpu->vcpuid;
+	struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpuid];
+
+	vcpu_run(vm, vcpuid);
+
+	switch (get_ucall(vm, vcpuid, &uc)) {
+	case UCALL_SYNC:
+	case UCALL_DONE:
+		break;
+	case UCALL_ABORT:
+		sync_global_from_guest(vm, *shared_data);
+		TEST_ASSERT(false,
+			"%s at %s:%ld\n\tvalues: %lu, %lu; %lu, vcpu: %u; stage: %u; iter: %u",
+			(const char *)uc.args[0], __FILE__, uc.args[1],
+			uc.args[2], uc.args[3], uc.args[4], vcpuid,
+			shared_data->guest_stage, shared_data->nr_iter);
+		break;
+	default:
+		TEST_FAIL("Unexpected guest exit\n");
+	}
+
+	return NULL;
+}
+
+static void test_run(struct kvm_vm *vm)
+{
+	int i, ret;
+
+	for (i = 0; i < test_args.nr_vcpus; i++) {
+		ret = pthread_create(&test_vcpu[i].pt_vcpu_run, NULL,
+				test_vcpu_run, &test_vcpu[i]);
+		TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
+	}
+
+	for (i = 0; i < test_args.nr_vcpus; i++)
+		pthread_join(test_vcpu[i].pt_vcpu_run, NULL);
+}
+
+static void test_vm_setup_gic(struct kvm_vm *vm, unsigned int n_gicr_pages)
+{
+	uint64_t addr;
+	int gic_fd;
+
+	gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
+
+	addr = GICD_BASE_GPA;
+	kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+				KVM_VGIC_V3_ADDR_TYPE_DIST, &addr, true);
+	virt_pg_map(vm, GICD_BASE_GPA, GICD_BASE_GPA);
+
+	addr = REDIST_REGION_ATTR_ADDR(test_args.nr_vcpus, GICR_BASE_GPA, 0, 0);
+	kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+			KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
+	virt_map(vm, GICR_BASE_GPA, GICR_BASE_GPA, n_gicr_pages);
+
+	kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
+				KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
+}
+
+static struct kvm_vm *test_vm_create(void)
+{
+	struct kvm_vm *vm;
+	unsigned int i, n_gicr_pages;
+	int nr_vcpus = test_args.nr_vcpus;
+
+	/* Reserve additional pages for GICR MMIO based on nr_vcpus */
+	n_gicr_pages = vm_calc_num_guest_pages(VM_MODE_DEFAULT,
+						2 * SZ_64K * nr_vcpus);
+
+	vm = vm_create_default_with_vcpus(nr_vcpus, n_gicr_pages, 0,
+						guest_code, NULL);
+
+	vm_init_descriptor_tables(vm);
+	vm_install_exception_handler(vm, VECTOR_IRQ_CURRENT, guest_irq_handler);
+
+	for (i = 0; i < nr_vcpus; i++) {
+		vcpu_init_descriptor_tables(vm, i);
+
+		test_vcpu[i].vcpuid = i;
+		test_vcpu[i].vm = vm;
+	}
+
+	ucall_init(vm, NULL);
+	test_vm_setup_gic(vm, n_gicr_pages);
+
+	/* Make all the test's cmdline args visible to the guest */
+	sync_global_to_guest(vm, test_args);
+
+	return vm;
+}
+
+static void test_print_help(char *name)
+{
+	pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
+		name);
+	pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
+		NR_VCPUS_DEF, KVM_MAX_VCPUS);
+	pr_info("\t-i: Number of iterations per stage (default: %u)\n",
+		NR_TEST_ITERS_DEF);
+	pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
+		TIMER_TEST_PERIOD_MS_DEF);
+	pr_info("\t-h: print this help screen\n");
+}
+
+static bool parse_args(int argc, char *argv[])
+{
+	int opt;
+
+	while ((opt = getopt(argc, argv, "hn:i:p:")) != -1) {
+		switch (opt) {
+		case 'n':
+			test_args.nr_vcpus = atoi(optarg);
+			if (test_args.nr_vcpus <= 0) {
+				pr_info("Positive value needed for -n\n");
+				goto err;
+			} else if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
+				pr_info("Max allowed vCPUs: %u\n",
+					KVM_MAX_VCPUS);
+				goto err;
+			}
+			break;
+		case 'i':
+			test_args.nr_iter = atoi(optarg);
+			if (test_args.nr_iter <= 0) {
+				pr_info("Positive value needed for -i\n");
+				goto err;
+			}
+			break;
+		case 'p':
+			test_args.timer_period_ms = atoi(optarg);
+			if (test_args.timer_period_ms <= 0) {
+				pr_info("Positive value needed for -p\n");
+				goto err;
+			}
+			break;
+		case 'h':
+		default:
+			goto err;
+		}
+	}
+
+	return true;
+
+err:
+	test_print_help(argv[0]);
+	return false;
+}
+
+int main(int argc, char *argv[])
+{
+	struct kvm_vm *vm;
+
+	/* Tell stdout not to buffer its content */
+	setbuf(stdout, NULL);
+
+	if (!parse_args(argc, argv))
+		exit(KSFT_SKIP);
+
+	vm = test_vm_create();
+	test_run(vm);
+	kvm_vm_free(vm);
+
+	return 0;
+}
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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Re: [PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers

[Zenghui Yu]

On 2021/8/14 5:12, Raghavendra Rao Ananta wrote:
> Add a minimalistic library support to access the virtual timers,
> that can be used for simple timing functionalities, such as
> introducing delays in the guest.
> 
> Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
> ---
>  .../kvm/include/aarch64/arch_timer.h          | 138 ++++++++++++++++++
>  1 file changed, 138 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> 
> diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> new file mode 100644
> index 000000000000..e6144ab95348
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> @@ -0,0 +1,138 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * ARM Generic Interrupt Controller (GIC) specific defines

This isn't GIC specific, but arch timer.

> + */
> +
> +#ifndef SELFTEST_KVM_ARCH_TIMER_H
> +#define SELFTEST_KVM_ARCH_TIMER_H
> +
> +#include <linux/sizes.h>

Do we really need it?

> +
> +#include "processor.h"
> +
> +enum arch_timer {
> +	VIRTUAL,
> +	PHYSICAL,
> +};
> +
> +#define CTL_ENABLE	(1 << 0)
> +#define CTL_ISTATUS	(1 << 2)
> +#define CTL_IMASK	(1 << 1)

nitpick: Move CTL_IMASK before CTL_ISTATUS ?

> +
> +#define msec_to_cycles(msec)	\
> +	(timer_get_cntfrq() * (uint64_t)(msec) / 1000)
> +
> +#define usec_to_cycles(usec)	\
> +	(timer_get_cntfrq() * (uint64_t)(usec) / 1000000)
> +
> +#define cycles_to_usec(cycles) \
> +	((uint64_t)(cycles) * 1000000 / timer_get_cntfrq())
> +
> +static inline uint32_t timer_get_cntfrq(void)
> +{
> +	return read_sysreg(cntfrq_el0);
> +}
> +
> +static inline uint64_t timer_get_cntct(enum arch_timer timer)
> +{
> +	isb();
> +
> +	switch (timer) {
> +	case VIRTUAL:
> +		return read_sysreg(cntvct_el0);
> +	case PHYSICAL:
> +		return read_sysreg(cntpct_el0);
> +	default:
> +		GUEST_ASSERT_1(0, timer);
> +	}
> +
> +	/* We should not reach here */
> +	return 0;
> +}
> +
> +static inline void timer_set_cval(enum arch_timer timer, uint64_t cval)
> +{
> +	switch (timer) {
> +	case VIRTUAL:
> +		return write_sysreg(cntv_cval_el0, cval);
> +	case PHYSICAL:
> +		return write_sysreg(cntp_cval_el0, cval);
> +	default:
> +		GUEST_ASSERT_1(0, timer);
> +	}
> +
> +	isb();

ISB should be performed before 'return'. And the same for
timer_set_{tval,ctl}.

Thanks,
Zenghui

Re: [PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers

[Zenghui Yu]

On 2021/8/14 5:12, Raghavendra Rao Ananta wrote:
> Add a minimalistic library support to access the virtual timers,
> that can be used for simple timing functionalities, such as
> introducing delays in the guest.
> 
> Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
> ---
>  .../kvm/include/aarch64/arch_timer.h          | 138 ++++++++++++++++++
>  1 file changed, 138 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> 
> diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> new file mode 100644
> index 000000000000..e6144ab95348
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> @@ -0,0 +1,138 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * ARM Generic Interrupt Controller (GIC) specific defines

This isn't GIC specific, but arch timer.

> + */
> +
> +#ifndef SELFTEST_KVM_ARCH_TIMER_H
> +#define SELFTEST_KVM_ARCH_TIMER_H
> +
> +#include <linux/sizes.h>

Do we really need it?

> +
> +#include "processor.h"
> +
> +enum arch_timer {
> +	VIRTUAL,
> +	PHYSICAL,
> +};
> +
> +#define CTL_ENABLE	(1 << 0)
> +#define CTL_ISTATUS	(1 << 2)
> +#define CTL_IMASK	(1 << 1)

nitpick: Move CTL_IMASK before CTL_ISTATUS ?

> +
> +#define msec_to_cycles(msec)	\
> +	(timer_get_cntfrq() * (uint64_t)(msec) / 1000)
> +
> +#define usec_to_cycles(usec)	\
> +	(timer_get_cntfrq() * (uint64_t)(usec) / 1000000)
> +
> +#define cycles_to_usec(cycles) \
> +	((uint64_t)(cycles) * 1000000 / timer_get_cntfrq())
> +
> +static inline uint32_t timer_get_cntfrq(void)
> +{
> +	return read_sysreg(cntfrq_el0);
> +}
> +
> +static inline uint64_t timer_get_cntct(enum arch_timer timer)
> +{
> +	isb();
> +
> +	switch (timer) {
> +	case VIRTUAL:
> +		return read_sysreg(cntvct_el0);
> +	case PHYSICAL:
> +		return read_sysreg(cntpct_el0);
> +	default:
> +		GUEST_ASSERT_1(0, timer);
> +	}
> +
> +	/* We should not reach here */
> +	return 0;
> +}
> +
> +static inline void timer_set_cval(enum arch_timer timer, uint64_t cval)
> +{
> +	switch (timer) {
> +	case VIRTUAL:
> +		return write_sysreg(cntv_cval_el0, cval);
> +	case PHYSICAL:
> +		return write_sysreg(cntp_cval_el0, cval);
> +	default:
> +		GUEST_ASSERT_1(0, timer);
> +	}
> +
> +	isb();

ISB should be performed before 'return'. And the same for
timer_set_{tval,ctl}.

Thanks,
Zenghui
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Re: [PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest

[Andrew Jones]

On Fri, Aug 13, 2021 at 09:12:01PM +0000, Raghavendra Rao Ananta wrote:
> Hello,
> 
> The patch series adds a KVM selftest to validate the behavior of
> ARM's generic timer (patch-10). The test programs the timer IRQs
> periodically, and for each interrupt, it validates the behaviour
> against the architecture specifications. The test further provides
> a command-line interface to configure the number of vCPUs, the
> period of the timer, and the number of iterations that the test
> has to run for.
> 
> Since the test heavily depends on interrupts, the patch series also
> adds a basic support for ARM Generic Interrupt Controller v3 (GICv3)
> to the KVM's aarch64 selftest framework (patch-9).
> 
> Furthermore, additional processor utilities such as accessing the MMIO
> (via readl/writel), read/write to assembler unsupported registers,
> basic delay generation, enable/disable local IRQs, spinlock support,
> and so on, are also introduced that the test/GICv3 takes advantage of.
> These are presented in patches 1 through 8.
> 
> The patch series, specifically the library support, is derived from the
> kvm-unit-tests and the kernel itself.
> 

Hi Raghavendra,

I appreciate the new support being added to aarch64 kselftests in order to
support new tests. I'm curious as to why the kvm-unit-tests timer test
wasn't extended instead, though. Also, I'm curious if you've seen any
room for improvements to the kvm-unit-tests code and, if so, if you plan
to submit patches for those improvements.

Thanks,
drew

Re: [PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest

[Andrew Jones]

On Fri, Aug 13, 2021 at 09:12:01PM +0000, Raghavendra Rao Ananta wrote:
> Hello,
> 
> The patch series adds a KVM selftest to validate the behavior of
> ARM's generic timer (patch-10). The test programs the timer IRQs
> periodically, and for each interrupt, it validates the behaviour
> against the architecture specifications. The test further provides
> a command-line interface to configure the number of vCPUs, the
> period of the timer, and the number of iterations that the test
> has to run for.
> 
> Since the test heavily depends on interrupts, the patch series also
> adds a basic support for ARM Generic Interrupt Controller v3 (GICv3)
> to the KVM's aarch64 selftest framework (patch-9).
> 
> Furthermore, additional processor utilities such as accessing the MMIO
> (via readl/writel), read/write to assembler unsupported registers,
> basic delay generation, enable/disable local IRQs, spinlock support,
> and so on, are also introduced that the test/GICv3 takes advantage of.
> These are presented in patches 1 through 8.
> 
> The patch series, specifically the library support, is derived from the
> kvm-unit-tests and the kernel itself.
> 

Hi Raghavendra,

I appreciate the new support being added to aarch64 kselftests in order to
support new tests. I'm curious as to why the kvm-unit-tests timer test
wasn't extended instead, though. Also, I'm curious if you've seen any
room for improvements to the kvm-unit-tests code and, if so, if you plan
to submit patches for those improvements.

Thanks,
drew

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Re: [PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers

[Raghavendra Rao Ananta]

Hi Zenghui,

On Sat, Aug 14, 2021 at 2:10 AM Zenghui Yu <yuzenghui@huawei.com> wrote:
>
> On 2021/8/14 5:12, Raghavendra Rao Ananta wrote:
> > Add a minimalistic library support to access the virtual timers,
> > that can be used for simple timing functionalities, such as
> > introducing delays in the guest.
> >
> > Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
> > ---
> >  .../kvm/include/aarch64/arch_timer.h          | 138 ++++++++++++++++++
> >  1 file changed, 138 insertions(+)
> >  create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> >
> > diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> > new file mode 100644
> > index 000000000000..e6144ab95348
> > --- /dev/null
> > +++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> > @@ -0,0 +1,138 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * ARM Generic Interrupt Controller (GIC) specific defines
>
> This isn't GIC specific, but arch timer.

You are right. That's my bad.
>
>
> > + */
> > +
> > +#ifndef SELFTEST_KVM_ARCH_TIMER_H
> > +#define SELFTEST_KVM_ARCH_TIMER_H
> > +
> > +#include <linux/sizes.h>
>
> Do we really need it?


I must have left it from some code re-org. We don't need it anymore.
Will remove.
>
>
> > +
> > +#include "processor.h"
> > +
> > +enum arch_timer {
> > +     VIRTUAL,
> > +     PHYSICAL,
> > +};
> > +
> > +#define CTL_ENABLE   (1 << 0)
> > +#define CTL_ISTATUS  (1 << 2)
> > +#define CTL_IMASK    (1 << 1)
>
> nitpick: Move CTL_IMASK before CTL_ISTATUS ?


Sure, that's cleaner!
>
>
> > +
> > +#define msec_to_cycles(msec) \
> > +     (timer_get_cntfrq() * (uint64_t)(msec) / 1000)
> > +
> > +#define usec_to_cycles(usec) \
> > +     (timer_get_cntfrq() * (uint64_t)(usec) / 1000000)
> > +
> > +#define cycles_to_usec(cycles) \
> > +     ((uint64_t)(cycles) * 1000000 / timer_get_cntfrq())
> > +
> > +static inline uint32_t timer_get_cntfrq(void)
> > +{
> > +     return read_sysreg(cntfrq_el0);
> > +}
> > +
> > +static inline uint64_t timer_get_cntct(enum arch_timer timer)
> > +{
> > +     isb();
> > +
> > +     switch (timer) {
> > +     case VIRTUAL:
> > +             return read_sysreg(cntvct_el0);
> > +     case PHYSICAL:
> > +             return read_sysreg(cntpct_el0);
> > +     default:
> > +             GUEST_ASSERT_1(0, timer);
> > +     }
> > +
> > +     /* We should not reach here */
> > +     return 0;
> > +}
> > +
> > +static inline void timer_set_cval(enum arch_timer timer, uint64_t cval)
> > +{
> > +     switch (timer) {
> > +     case VIRTUAL:
> > +             return write_sysreg(cntv_cval_el0, cval);
> > +     case PHYSICAL:
> > +             return write_sysreg(cntp_cval_el0, cval);
> > +     default:
> > +             GUEST_ASSERT_1(0, timer);
> > +     }
> > +
> > +     isb();
>
> ISB should be performed before 'return'. And the same for
> timer_set_{tval,ctl}.


Seems like a copy-paste error on my side. The timer_set_*() functions
shouldn't even have a 'return'. Thanks for catching this! Will fix it.
>
>
> Thanks,
> Zenghui


Regards,
Raghavendra

Re: [PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers

[Raghavendra Rao Ananta]

Hi Zenghui,

On Sat, Aug 14, 2021 at 2:10 AM Zenghui Yu <yuzenghui@huawei.com> wrote:
>
> On 2021/8/14 5:12, Raghavendra Rao Ananta wrote:
> > Add a minimalistic library support to access the virtual timers,
> > that can be used for simple timing functionalities, such as
> > introducing delays in the guest.
> >
> > Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
> > ---
> >  .../kvm/include/aarch64/arch_timer.h          | 138 ++++++++++++++++++
> >  1 file changed, 138 insertions(+)
> >  create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> >
> > diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> > new file mode 100644
> > index 000000000000..e6144ab95348
> > --- /dev/null
> > +++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
> > @@ -0,0 +1,138 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * ARM Generic Interrupt Controller (GIC) specific defines
>
> This isn't GIC specific, but arch timer.

You are right. That's my bad.
>
>
> > + */
> > +
> > +#ifndef SELFTEST_KVM_ARCH_TIMER_H
> > +#define SELFTEST_KVM_ARCH_TIMER_H
> > +
> > +#include <linux/sizes.h>
>
> Do we really need it?


I must have left it from some code re-org. We don't need it anymore.
Will remove.
>
>
> > +
> > +#include "processor.h"
> > +
> > +enum arch_timer {
> > +     VIRTUAL,
> > +     PHYSICAL,
> > +};
> > +
> > +#define CTL_ENABLE   (1 << 0)
> > +#define CTL_ISTATUS  (1 << 2)
> > +#define CTL_IMASK    (1 << 1)
>
> nitpick: Move CTL_IMASK before CTL_ISTATUS ?


Sure, that's cleaner!
>
>
> > +
> > +#define msec_to_cycles(msec) \
> > +     (timer_get_cntfrq() * (uint64_t)(msec) / 1000)
> > +
> > +#define usec_to_cycles(usec) \
> > +     (timer_get_cntfrq() * (uint64_t)(usec) / 1000000)
> > +
> > +#define cycles_to_usec(cycles) \
> > +     ((uint64_t)(cycles) * 1000000 / timer_get_cntfrq())
> > +
> > +static inline uint32_t timer_get_cntfrq(void)
> > +{
> > +     return read_sysreg(cntfrq_el0);
> > +}
> > +
> > +static inline uint64_t timer_get_cntct(enum arch_timer timer)
> > +{
> > +     isb();
> > +
> > +     switch (timer) {
> > +     case VIRTUAL:
> > +             return read_sysreg(cntvct_el0);
> > +     case PHYSICAL:
> > +             return read_sysreg(cntpct_el0);
> > +     default:
> > +             GUEST_ASSERT_1(0, timer);
> > +     }
> > +
> > +     /* We should not reach here */
> > +     return 0;
> > +}
> > +
> > +static inline void timer_set_cval(enum arch_timer timer, uint64_t cval)
> > +{
> > +     switch (timer) {
> > +     case VIRTUAL:
> > +             return write_sysreg(cntv_cval_el0, cval);
> > +     case PHYSICAL:
> > +             return write_sysreg(cntp_cval_el0, cval);
> > +     default:
> > +             GUEST_ASSERT_1(0, timer);
> > +     }
> > +
> > +     isb();
>
> ISB should be performed before 'return'. And the same for
> timer_set_{tval,ctl}.


Seems like a copy-paste error on my side. The timer_set_*() functions
shouldn't even have a 'return'. Thanks for catching this! Will fix it.
>
>
> Thanks,
> Zenghui


Regards,
Raghavendra
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Re: [PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest

[Raghavendra Rao Ananta]

On Mon, Aug 16, 2021 at 5:15 AM Andrew Jones <drjones@redhat.com> wrote:
>
> On Fri, Aug 13, 2021 at 09:12:01PM +0000, Raghavendra Rao Ananta wrote:
> > Hello,
> >
> > The patch series adds a KVM selftest to validate the behavior of
> > ARM's generic timer (patch-10). The test programs the timer IRQs
> > periodically, and for each interrupt, it validates the behaviour
> > against the architecture specifications. The test further provides
> > a command-line interface to configure the number of vCPUs, the
> > period of the timer, and the number of iterations that the test
> > has to run for.
> >
> > Since the test heavily depends on interrupts, the patch series also
> > adds a basic support for ARM Generic Interrupt Controller v3 (GICv3)
> > to the KVM's aarch64 selftest framework (patch-9).
> >
> > Furthermore, additional processor utilities such as accessing the MMIO
> > (via readl/writel), read/write to assembler unsupported registers,
> > basic delay generation, enable/disable local IRQs, spinlock support,
> > and so on, are also introduced that the test/GICv3 takes advantage of.
> > These are presented in patches 1 through 8.
> >
> > The patch series, specifically the library support, is derived from the
> > kvm-unit-tests and the kernel itself.
> >
>
> Hi Raghavendra,
>
> I appreciate the new support being added to aarch64 kselftests in order to
> support new tests. I'm curious as to why the kvm-unit-tests timer test
> wasn't extended instead, though. Also, I'm curious if you've seen any
> room for improvements to the kvm-unit-tests code and, if so, if you plan
> to submit patches for those improvements.


Hi  Andrew,

Interesting question! It's more about ease and flexibility in
controlling the guest via the VMM-
Since arch_timer's interface is mostly per-CPU, we'd like to extend
this test case to be
more stressful, such as migrating the vCPUs across pCPUs rapidly, or
even affining
a large number of vCPUs to a single pCPU, and so on.

On the other hand, since the patch series brings-in a lot of aarch64
goodies with it,
such as interrupt support, it might encourage others to add more arch
specific tests
easily :) For example, we also plan to add tests that verifies KVM
interface for interrupts,
for which the GIC support in the series would come handy.

I'm still gaining understanding of kvm-unit-tests. However, I'm
curious to know your thoughts as
well in-support of kvm-unit-tests.

Unfortunately, I don't have any immediate plans to submit patches on
arch_timer for
kvm-unit-tests.

Thanks,
Raghavendra

>
>
> Thanks,
> drew
>

Re: [PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest

[Raghavendra Rao Ananta]

On Mon, Aug 16, 2021 at 5:15 AM Andrew Jones <drjones@redhat.com> wrote:
>
> On Fri, Aug 13, 2021 at 09:12:01PM +0000, Raghavendra Rao Ananta wrote:
> > Hello,
> >
> > The patch series adds a KVM selftest to validate the behavior of
> > ARM's generic timer (patch-10). The test programs the timer IRQs
> > periodically, and for each interrupt, it validates the behaviour
> > against the architecture specifications. The test further provides
> > a command-line interface to configure the number of vCPUs, the
> > period of the timer, and the number of iterations that the test
> > has to run for.
> >
> > Since the test heavily depends on interrupts, the patch series also
> > adds a basic support for ARM Generic Interrupt Controller v3 (GICv3)
> > to the KVM's aarch64 selftest framework (patch-9).
> >
> > Furthermore, additional processor utilities such as accessing the MMIO
> > (via readl/writel), read/write to assembler unsupported registers,
> > basic delay generation, enable/disable local IRQs, spinlock support,
> > and so on, are also introduced that the test/GICv3 takes advantage of.
> > These are presented in patches 1 through 8.
> >
> > The patch series, specifically the library support, is derived from the
> > kvm-unit-tests and the kernel itself.
> >
>
> Hi Raghavendra,
>
> I appreciate the new support being added to aarch64 kselftests in order to
> support new tests. I'm curious as to why the kvm-unit-tests timer test
> wasn't extended instead, though. Also, I'm curious if you've seen any
> room for improvements to the kvm-unit-tests code and, if so, if you plan
> to submit patches for those improvements.


Hi  Andrew,

Interesting question! It's more about ease and flexibility in
controlling the guest via the VMM-
Since arch_timer's interface is mostly per-CPU, we'd like to extend
this test case to be
more stressful, such as migrating the vCPUs across pCPUs rapidly, or
even affining
a large number of vCPUs to a single pCPU, and so on.

On the other hand, since the patch series brings-in a lot of aarch64
goodies with it,
such as interrupt support, it might encourage others to add more arch
specific tests
easily :) For example, we also plan to add tests that verifies KVM
interface for interrupts,
for which the GIC support in the series would come handy.

I'm still gaining understanding of kvm-unit-tests. However, I'm
curious to know your thoughts as
well in-support of kvm-unit-tests.

Unfortunately, I don't have any immediate plans to submit patches on
arch_timer for
kvm-unit-tests.

Thanks,
Raghavendra

>
>
> Thanks,
> drew
>
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kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm