Patch "KVM: arm64: Mark some header functions as inline" has been added to the 6.12-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    KVM: arm64: Mark some header functions as inline

to the 6.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-arm64-mark-some-header-functions-as-inline.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From broonie at kernel.org Thu Mar 20 17:13:50 2025
From: Mark Brown <broonie at kernel.org>
Date: Fri, 21 Mar 2025 00:13:03 +0000
Subject: KVM: arm64: Mark some header functions as inline
To: Greg Kroah-Hartman <gregkh at linuxfoundation.org>,  Marc Zyngier <maz at kernel.org>, Oliver Upton <oliver.upton at linux.dev>,  Joey Gouly <joey.gouly at arm.com>, Suzuki K Poulose <suzuki.poulose at arm.com>,  Catalin Marinas <catalin.marinas at arm.com>, Will Deacon <will at kernel.org>
Cc: linux-arm-kernel at lists.infradead.org, kvmarm at lists.linux.dev,  linux-kernel at vger.kernel.org, stable at vger.kernel.org,  Mark Brown <broonie at kernel.org>, Mark Rutland <mark.rutland at arm.com>,  Fuad Tabba <tabba at google.com>
Message-ID: <20250321-stable-sve-6-12-v2-7-417ca2278d18 at kernel.org>

From: Mark Rutland <mark.rutland at arm.com>

[ Upstream commit f9dd00de1e53a47763dfad601635d18542c3836d ]

The shared hyp switch header has a number of static functions which
might not be used by all files that include the header, and when unused
they will provoke compiler warnings, e.g.

| In file included from arch/arm64/kvm/hyp/nvhe/hyp-main.c:8:
| ./arch/arm64/kvm/hyp/include/hyp/switch.h:703:13: warning: 'kvm_hyp_handle_dabt_low' defined but not used [-Wunused-function]
|   703 | static bool kvm_hyp_handle_dabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
|       |             ^~~~~~~~~~~~~~~~~~~~~~~
| ./arch/arm64/kvm/hyp/include/hyp/switch.h:682:13: warning: 'kvm_hyp_handle_cp15_32' defined but not used [-Wunused-function]
|   682 | static bool kvm_hyp_handle_cp15_32(struct kvm_vcpu *vcpu, u64 *exit_code)
|       |             ^~~~~~~~~~~~~~~~~~~~~~
| ./arch/arm64/kvm/hyp/include/hyp/switch.h:662:13: warning: 'kvm_hyp_handle_sysreg' defined but not used [-Wunused-function]
|   662 | static bool kvm_hyp_handle_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code)
|       |             ^~~~~~~~~~~~~~~~~~~~~
| ./arch/arm64/kvm/hyp/include/hyp/switch.h:458:13: warning: 'kvm_hyp_handle_fpsimd' defined but not used [-Wunused-function]
|   458 | static bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
|       |             ^~~~~~~~~~~~~~~~~~~~~
| ./arch/arm64/kvm/hyp/include/hyp/switch.h:329:13: warning: 'kvm_hyp_handle_mops' defined but not used [-Wunused-function]
|   329 | static bool kvm_hyp_handle_mops(struct kvm_vcpu *vcpu, u64 *exit_code)
|       |             ^~~~~~~~~~~~~~~~~~~

Mark these functions as 'inline' to suppress this warning. This
shouldn't result in any functional change.

At the same time, avoid the use of __alias() in the header and alias
kvm_hyp_handle_iabt_low() and kvm_hyp_handle_watchpt_low() to
kvm_hyp_handle_memory_fault() using CPP, matching the style in the rest
of the kernel. For consistency, kvm_hyp_handle_memory_fault() is also
marked as 'inline'.

Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Reviewed-by: Mark Brown <broonie at kernel.org>
Tested-by: Mark Brown <broonie at kernel.org>
Acked-by: Will Deacon <will at kernel.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Fuad Tabba <tabba at google.com>
Cc: Marc Zyngier <maz at kernel.org>
Cc: Oliver Upton <oliver.upton at linux.dev>
Reviewed-by: Oliver Upton <oliver.upton at linux.dev>
Link: https://lore.kernel.org/r/20250210195226.1215254-8-mark.rutland@arm.com
Signed-off-by: Marc Zyngier <maz at kernel.org>
Signed-off-by: Mark Brown <broonie at kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 arch/arm64/kvm/hyp/include/hyp/switch.h |   19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -295,7 +295,7 @@ static inline bool __populate_fault_info
 	return __get_fault_info(vcpu->arch.fault.esr_el2, &vcpu->arch.fault);
 }
 
-static bool kvm_hyp_handle_mops(struct kvm_vcpu *vcpu, u64 *exit_code)
+static inline bool kvm_hyp_handle_mops(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
 	*vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR);
 	arm64_mops_reset_regs(vcpu_gp_regs(vcpu), vcpu->arch.fault.esr_el2);
@@ -373,7 +373,7 @@ static void kvm_hyp_save_fpsimd_host(str
  * If FP/SIMD is not implemented, handle the trap and inject an undefined
  * instruction exception to the guest. Similarly for trapped SVE accesses.
  */
-static bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
+static inline bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
 	bool sve_guest;
 	u8 esr_ec;
@@ -564,7 +564,7 @@ static bool handle_ampere1_tcr(struct kv
 	return true;
 }
 
-static bool kvm_hyp_handle_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code)
+static inline bool kvm_hyp_handle_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
 	if (cpus_have_final_cap(ARM64_WORKAROUND_CAVIUM_TX2_219_TVM) &&
 	    handle_tx2_tvm(vcpu))
@@ -584,7 +584,7 @@ static bool kvm_hyp_handle_sysreg(struct
 	return false;
 }
 
-static bool kvm_hyp_handle_cp15_32(struct kvm_vcpu *vcpu, u64 *exit_code)
+static inline bool kvm_hyp_handle_cp15_32(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
 	if (static_branch_unlikely(&vgic_v3_cpuif_trap) &&
 	    __vgic_v3_perform_cpuif_access(vcpu) == 1)
@@ -593,19 +593,18 @@ static bool kvm_hyp_handle_cp15_32(struc
 	return false;
 }
 
-static bool kvm_hyp_handle_memory_fault(struct kvm_vcpu *vcpu, u64 *exit_code)
+static inline bool kvm_hyp_handle_memory_fault(struct kvm_vcpu *vcpu,
+					       u64 *exit_code)
 {
 	if (!__populate_fault_info(vcpu))
 		return true;
 
 	return false;
 }
-static bool kvm_hyp_handle_iabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
-	__alias(kvm_hyp_handle_memory_fault);
-static bool kvm_hyp_handle_watchpt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
-	__alias(kvm_hyp_handle_memory_fault);
+#define kvm_hyp_handle_iabt_low		kvm_hyp_handle_memory_fault
+#define kvm_hyp_handle_watchpt_low	kvm_hyp_handle_memory_fault
 
-static bool kvm_hyp_handle_dabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
+static inline bool kvm_hyp_handle_dabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
 	if (kvm_hyp_handle_memory_fault(vcpu, exit_code))
 		return true;


Patches currently in stable-queue which might be from broonie at kernel.org are

queue-6.12/kvm-arm64-calculate-cptr_el2-traps-on-activating-traps.patch
queue-6.12/regulator-check-that-dummy-regulator-has-been-probed-before-using-it.patch
queue-6.12/kvm-arm64-eagerly-switch-zcr_el-1-2.patch
queue-6.12/kvm-arm64-mark-some-header-functions-as-inline.patch
queue-6.12/kvm-arm64-remove-host-fpsimd-saving-for-non-protected-kvm.patch
queue-6.12/regulator-dummy-force-synchronous-probing.patch
queue-6.12/kvm-arm64-refactor-exit-handlers.patch
queue-6.12/kvm-arm64-unconditionally-save-flush-host-fpsimd-sve-sme-state.patch
queue-6.12/kvm-arm64-remove-vhe-host-restore-of-cpacr_el1.smen.patch
queue-6.12/kvm-arm64-remove-vhe-host-restore-of-cpacr_el1.zen.patch