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KVM: arm64: Simplify __kvm_timer_set_cntvoff implementation 

Now that this function isn't constrained by the 32bit PCS,
let's simplify it by taking a single 64bit offset instead
of two 32bit parameters.

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2020-05-13 11:58:29 +01:00
parent 25357de01b
commit c6fe89ff8b
3 changed files with 3 additions and 14 deletions
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2
arch/arm64/include/asm/kvm_asm.h
View File

@ -64,7 +64,7 @@ extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu);
extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
extern void __kvm_timer_set_cntvoff(u64 cntvoff);
extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu);

12
arch/arm64/kvm/arch_timer.c
View File

@ -451,17 +451,7 @@ out:
static void set_cntvoff(u64 cntvoff)
{
u32 low = lower_32_bits(cntvoff);
u32 high = upper_32_bits(cntvoff);
/*
* Since kvm_call_hyp doesn't fully support the ARM PCS especially on
* 32-bit systems, but rather passes register by register shifted one
* place (we put the function address in r0/x0), we cannot simply pass
* a 64-bit value as an argument, but have to split the value in two
* 32-bit halves.
*/
kvm_call_hyp(__kvm_timer_set_cntvoff, low, high);
kvm_call_hyp(__kvm_timer_set_cntvoff, cntvoff);
}
static inline void set_timer_irq_phys_active(struct arch_timer_context *ctx, bool active)

3
arch/arm64/kvm/hyp/timer-sr.c
View File

@ -10,9 +10,8 @@
#include <asm/kvm_hyp.h>
void __hyp_text __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high)
void __hyp_text __kvm_timer_set_cntvoff(u64 cntvoff)
{
u64 cntvoff = (u64)cntvoff_high << 32 | cntvoff_low;
write_sysreg(cntvoff, cntvoff_el2);
}