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RISC-V: Use common riscv_cpuid_to_hartid_mask() for both SMP=y and SMP=n 

Use what is currently the SMP=y version of riscv_cpuid_to_hartid_mask()
for both SMP=y and SMP=n to fix a build failure with KVM=m and SMP=n due
to boot_cpu_hartid not being exported.  This also fixes a second bug
where the SMP=n version assumes the sole CPU in the system is in the
incoming mask, which may not hold true in kvm_riscv_vcpu_sbi_ecall() if
the KVM guest VM has multiple vCPUs (on a SMP=n system).

Fixes: 1ef46c231d ("RISC-V: Implement new SBI v0.2 extensions")
Reported-by: Adam Borowski <kilobyte@angband.pl>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Sean Christopherson 2021-11-29 21:43:42 +00:00 committed by Palmer Dabbelt
parent 51f23e5318
commit 869c706092
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
3 changed files with 12 additions and 18 deletions
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10
arch/riscv/include/asm/smp.h
View File

@ -43,7 +43,6 @@ void arch_send_call_function_ipi_mask(struct cpumask *mask);
void arch_send_call_function_single_ipi(int cpu);
int riscv_hartid_to_cpuid(int hartid);
void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
/* Set custom IPI operations */
void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops);
@ -83,13 +82,6 @@ static inline unsigned long cpuid_to_hartid_map(int cpu)
return boot_cpu_hartid;
}
static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in,
struct cpumask *out)
{
cpumask_clear(out);
cpumask_set_cpu(boot_cpu_hartid, out);
}
static inline void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
{
}
@ -100,6 +92,8 @@ static inline void riscv_clear_ipi(void)
#endif /* CONFIG_SMP */
void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
bool cpu_has_hotplug(unsigned int cpu);
#else

10
arch/riscv/kernel/setup.c
View File

@ -59,6 +59,16 @@ atomic_t hart_lottery __section(".sdata")
unsigned long boot_cpu_hartid;
static DEFINE_PER_CPU(struct cpu, cpu_devices);
void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out)
{
int cpu;
cpumask_clear(out);
for_each_cpu(cpu, in)
cpumask_set_cpu(cpuid_to_hartid_map(cpu), out);
}
EXPORT_SYMBOL_GPL(riscv_cpuid_to_hartid_mask);
/*
* Place kernel memory regions on the resource tree so that
* kexec-tools can retrieve them from /proc/iomem. While there

10
arch/riscv/kernel/smp.c
View File

@ -59,16 +59,6 @@ int riscv_hartid_to_cpuid(int hartid)
return -ENOENT;
}
void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out)
{
int cpu;
cpumask_clear(out);
for_each_cpu(cpu, in)
cpumask_set_cpu(cpuid_to_hartid_map(cpu), out);
}
EXPORT_SYMBOL_GPL(riscv_cpuid_to_hartid_mask);
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
return phys_id == cpuid_to_hartid_map(cpu);