[PATCH V2 0/5] KVM: arm64: General cleanups

[PATCH V2 0/5] KVM: arm64: General cleanups

[Anshuman Khandual]

This series contains mostly unrelated general cleanups. This series applies
on v5.14-rc5 and has been boot tested with different page sized guests.

Changes in V2:

- Dropped the first patch regarding PAGE_[SHIFT|SIZE] per Marc
- Added remaining ID_AA64MMFR0_PARANGE_ macros and ARM64_MIN_PARANGE_BITS per Marc
- Dropped memory and cycle reference from commit message in [PATCH 3/5]
- Changed return value as u32 in kvm_target_cpu() per Will

Changes in V1:

https://lore.kernel.org/lkml/1628578961-29097-1-git-send-email-anshuman.khandual@arm.com/

Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org

Anshuman Khandual (5):
  arm64/mm: Add remaining ID_AA64MMFR0_PARANGE_ macros
  KVM: arm64: Use ARM64_MIN_PARANGE_BITS as the minimum supported IPA
  KVM: arm64: Drop init_common_resources()
  KVM: arm64: Drop check_kvm_target_cpu() based percpu probe
  KVM: arm64: Drop unused REQUIRES_VIRT

 arch/arm64/include/asm/cpufeature.h | 14 +++++++-------
 arch/arm64/include/asm/kvm_host.h   |  2 +-
 arch/arm64/include/asm/sysreg.h     |  7 +++++++
 arch/arm64/kvm/arm.c                | 27 ++-------------------------
 arch/arm64/kvm/guest.c              |  4 ++--
 arch/arm64/kvm/reset.c              |  2 +-
 6 files changed, 20 insertions(+), 36 deletions(-)

-- 
2.20.1


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[PATCH V2 1/5] arm64/mm: Add remaining ID_AA64MMFR0_PARANGE_ macros

[Anshuman Khandual]

Currently there are macros only for 48 and 52 bits parange value extracted
from the ID_AA64MMFR0.PARANGE field. This change completes the enumeration
and updates the helper id_aa64mmfr0_parange_to_phys_shift(). While here it
also defines ARM64_MIN_PARANGE_BITS as the absolute minimum shift value PA
range which could be supported on a given platform.

Cc: Marc Zyngier <maz@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/arm64/include/asm/cpufeature.h | 14 +++++++-------
 arch/arm64/include/asm/sysreg.h     |  7 +++++++
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 9bb9d11750d7..8633bdb21f33 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -781,13 +781,13 @@ extern int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt);
 static inline u32 id_aa64mmfr0_parange_to_phys_shift(int parange)
 {
 	switch (parange) {
-	case 0: return 32;
-	case 1: return 36;
-	case 2: return 40;
-	case 3: return 42;
-	case 4: return 44;
-	case 5: return 48;
-	case 6: return 52;
+	case ID_AA64MMFR0_PARANGE_32: return 32;
+	case ID_AA64MMFR0_PARANGE_36: return 36;
+	case ID_AA64MMFR0_PARANGE_40: return 40;
+	case ID_AA64MMFR0_PARANGE_42: return 42;
+	case ID_AA64MMFR0_PARANGE_44: return 44;
+	case ID_AA64MMFR0_PARANGE_48: return 48;
+	case ID_AA64MMFR0_PARANGE_52: return 52;
 	/*
 	 * A future PE could use a value unknown to the kernel.
 	 * However, by the "D10.1.4 Principles of the ID scheme
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 7b9c3acba684..504e909129ea 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -853,9 +853,16 @@
 #define ID_AA64MMFR0_TGRAN64_SUPPORTED	0x0
 #define ID_AA64MMFR0_TGRAN16_NI		0x0
 #define ID_AA64MMFR0_TGRAN16_SUPPORTED	0x1
+#define ID_AA64MMFR0_PARANGE_32		0x0
+#define ID_AA64MMFR0_PARANGE_36		0x1
+#define ID_AA64MMFR0_PARANGE_40		0x2
+#define ID_AA64MMFR0_PARANGE_42		0x3
+#define ID_AA64MMFR0_PARANGE_44		0x4
 #define ID_AA64MMFR0_PARANGE_48		0x5
 #define ID_AA64MMFR0_PARANGE_52		0x6
 
+#define ARM64_MIN_PARANGE_BITS		32
+
 #define ID_AA64MMFR0_TGRAN_2_SUPPORTED_DEFAULT	0x0
 #define ID_AA64MMFR0_TGRAN_2_SUPPORTED_NONE	0x1
 #define ID_AA64MMFR0_TGRAN_2_SUPPORTED_MIN	0x2
-- 
2.20.1


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[PATCH V2 2/5] KVM: arm64: Use ARM64_MIN_PARANGE_BITS as the minimum supported IPA

[Anshuman Khandual]

Drop hard coded value for the minimum supported IPA range bits (i.e 32).
Instead use ARM64_MIN_PARANGE_BITS which improves the code readability.

Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/arm64/kvm/reset.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index cba7872d69a8..acf309698f33 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -369,7 +369,7 @@ int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 	phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type);
 	if (phys_shift) {
 		if (phys_shift > kvm_ipa_limit ||
-		    phys_shift < 32)
+		    phys_shift < ARM64_MIN_PARANGE_BITS)
 			return -EINVAL;
 	} else {
 		phys_shift = KVM_PHYS_SHIFT;
-- 
2.20.1


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[PATCH V2 3/5] KVM: arm64: Drop init_common_resources()

[Anshuman Khandual]

Could do without this additional indirection via init_common_resources() by
just calling kvm_set_ipa_limit() directly instead.

Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/arm64/kvm/arm.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e9a2b8f27792..19560e457c11 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1696,11 +1696,6 @@ static bool init_psci_relay(void)
 	return true;
 }
 
-static int init_common_resources(void)
-{
-	return kvm_set_ipa_limit();
-}
-
 static int init_subsystems(void)
 {
 	int err = 0;
@@ -2102,7 +2097,7 @@ int kvm_arch_init(void *opaque)
 		}
 	}
 
-	err = init_common_resources();
+	err = kvm_set_ipa_limit();
 	if (err)
 		return err;
 
-- 
2.20.1


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[PATCH V2 4/5] KVM: arm64: Drop check_kvm_target_cpu() based percpu probe

[Anshuman Khandual]

kvm_target_cpu() never returns a negative error code, so check_kvm_target()
would never have 'ret' filled with a negative error code. Hence the percpu
probe via check_kvm_target_cpu() does not make sense as its never going to
find an unsupported CPU, forcing kvm_arch_init() to exit early. Hence lets
just drop this percpu probe (and also check_kvm_target_cpu()) altogether.

While here, this also changes kvm_target_cpu() return type to a u32, making
it explicit that an error code will not be returned from this function.

Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/arm64/include/asm/kvm_host.h |  2 +-
 arch/arm64/kvm/arm.c              | 16 +---------------
 arch/arm64/kvm/guest.c            |  4 ++--
 3 files changed, 4 insertions(+), 18 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 41911585ae0c..26bbd84a02de 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -66,7 +66,7 @@ DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
 extern unsigned int kvm_sve_max_vl;
 int kvm_arm_init_sve(void);
 
-int __attribute_const__ kvm_target_cpu(void);
+u32 __attribute_const__ kvm_target_cpu(void);
 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
 void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
 
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 19560e457c11..ee9b1166f330 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1035,7 +1035,7 @@ static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 			       const struct kvm_vcpu_init *init)
 {
 	unsigned int i, ret;
-	int phys_target = kvm_target_cpu();
+	u32 phys_target = kvm_target_cpu();
 
 	if (init->target != phys_target)
 		return -EINVAL;
@@ -2010,11 +2010,6 @@ static int finalize_hyp_mode(void)
 	return 0;
 }
 
-static void check_kvm_target_cpu(void *ret)
-{
-	*(int *)ret = kvm_target_cpu();
-}
-
 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
 {
 	struct kvm_vcpu *vcpu;
@@ -2074,7 +2069,6 @@ void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
 int kvm_arch_init(void *opaque)
 {
 	int err;
-	int ret, cpu;
 	bool in_hyp_mode;
 
 	if (!is_hyp_mode_available()) {
@@ -2089,14 +2083,6 @@ int kvm_arch_init(void *opaque)
 		kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \
 			 "Only trusted guests should be used on this system.\n");
 
-	for_each_online_cpu(cpu) {
-		smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
-		if (ret < 0) {
-			kvm_err("Error, CPU %d not supported!\n", cpu);
-			return -ENODEV;
-		}
-	}
-
 	err = kvm_set_ipa_limit();
 	if (err)
 		return err;
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 1dfb83578277..8ce850fa7b49 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -842,7 +842,7 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
-int __attribute_const__ kvm_target_cpu(void)
+u32 __attribute_const__ kvm_target_cpu(void)
 {
 	unsigned long implementor = read_cpuid_implementor();
 	unsigned long part_number = read_cpuid_part_number();
@@ -874,7 +874,7 @@ int __attribute_const__ kvm_target_cpu(void)
 
 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
 {
-	int target = kvm_target_cpu();
+	u32 target = kvm_target_cpu();
 
 	if (target < 0)
 		return -ENODEV;
-- 
2.20.1


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[PATCH V2 5/5] KVM: arm64: Drop unused REQUIRES_VIRT

[Anshuman Khandual]

This seems like a residue from the past. REQUIRES_VIRT is no more available
. Hence it can just be dropped along with the related code section.

Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/arm64/kvm/arm.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index ee9b1166f330..d779a29c5607 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -42,10 +42,6 @@
 #include <kvm/arm_pmu.h>
 #include <kvm/arm_psci.h>
 
-#ifdef REQUIRES_VIRT
-__asm__(".arch_extension	virt");
-#endif
-
 static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT;
 DEFINE_STATIC_KEY_FALSE(kvm_protected_mode_initialized);
 
-- 
2.20.1


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Re: [PATCH V2 0/5] KVM: arm64: General cleanups

[Marc Zyngier]

On Thu, 12 Aug 2021 10:39:49 +0530, Anshuman Khandual wrote:
> This series contains mostly unrelated general cleanups. This series applies
> on v5.14-rc5 and has been boot tested with different page sized guests.
> 
> Changes in V2:
> 
> - Dropped the first patch regarding PAGE_[SHIFT|SIZE] per Marc
> - Added remaining ID_AA64MMFR0_PARANGE_ macros and ARM64_MIN_PARANGE_BITS per Marc
> - Dropped memory and cycle reference from commit message in [PATCH 3/5]
> - Changed return value as u32 in kvm_target_cpu() per Will
> 
> [...]

Applied to next, thanks!

[1/5] arm64/mm: Add remaining ID_AA64MMFR0_PARANGE_ macros
      commit: 504c6295b998effa682089747a96d7bb5933d4db
[2/5] KVM: arm64: Use ARM64_MIN_PARANGE_BITS as the minimum supported IPA
      commit: 9788c14060f3c179c376b2a87af1a430d4d84973
[3/5] KVM: arm64: Drop init_common_resources()
      commit: bf249d9e362f1011a839d57e771b4b1a7eed9656
[4/5] KVM: arm64: Drop check_kvm_target_cpu() based percpu probe
      commit: 6b7982fefc1fdcaa31b712f5fbc2e993cc99ad23
[5/5] KVM: arm64: Drop unused REQUIRES_VIRT
      commit: 9329752bc8659e3934e2b13434b2fddb0df0bb13

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.



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