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Commit 1b1973ef authored by Radim Krčmář's avatar Radim Krčmář
Browse files

Merge tag 'kvm-arm-for-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm 

KVM/ARM updates for 4.10-rc4

- Fix for timer setup on VHE machines
- Drop spurious warning when the timer races against
  the vcpu running again
- Prevent a vgic deadlock when the initialization fails
parents 49def185 1193e6ae

arch/arm/include/asm/virt.h

+5 −0
Original line number Diff line number Diff line
@@ -80,6 +80,11 @@ static inline bool is_kernel_in_hyp_mode(void) 
	return false;

}



static inline bool has_vhe(void)

{

	return false;

}



/* The section containing the hypervisor idmap text */

extern char __hyp_idmap_text_start[];

extern char __hyp_idmap_text_end[];

arch/arm/kvm/arm.c

+3 −0
Original line number Diff line number Diff line
@@ -1099,6 +1099,9 @@ static void cpu_init_hyp_mode(void *dummy) 
	__cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);

	__cpu_init_stage2();



	if (is_kernel_in_hyp_mode())

		kvm_timer_init_vhe();



	kvm_arm_init_debug();

}

arch/arm64/include/asm/virt.h

+9 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ 
#include <asm/ptrace.h>

#include <asm/sections.h>

#include <asm/sysreg.h>

#include <asm/cpufeature.h>



/*

 * __boot_cpu_mode records what mode CPUs were booted in.
@@ -80,6 +81,14 @@ static inline bool is_kernel_in_hyp_mode(void) 
	return read_sysreg(CurrentEL) == CurrentEL_EL2;

}



static inline bool has_vhe(void)

{

	if (cpus_have_const_cap(ARM64_HAS_VIRT_HOST_EXTN))

		return true;



	return false;

}



#ifdef CONFIG_ARM64_VHE

extern void verify_cpu_run_el(void);

#else

include/kvm/arm_arch_timer.h

+1 −0
Original line number Diff line number Diff line
@@ -76,4 +76,5 @@ void kvm_timer_unschedule(struct kvm_vcpu *vcpu); 


void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);



void kvm_timer_init_vhe(void);

#endif

virt/kvm/arm/arch_timer.c

+23 −3
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 


#include <clocksource/arm_arch_timer.h>

#include <asm/arch_timer.h>

#include <asm/kvm_hyp.h>



#include <kvm/arm_vgic.h>

#include <kvm/arm_arch_timer.h>
@@ -89,9 +90,6 @@ static void kvm_timer_inject_irq_work(struct work_struct *work) 
	struct kvm_vcpu *vcpu;



	vcpu = container_of(work, struct kvm_vcpu, arch.timer_cpu.expired);

	vcpu->arch.timer_cpu.armed = false;



	WARN_ON(!kvm_timer_should_fire(vcpu));



	/*

	 * If the vcpu is blocked we want to wake it up so that it will see
@@ -512,3 +510,25 @@ void kvm_timer_init(struct kvm *kvm) 
{

	kvm->arch.timer.cntvoff = kvm_phys_timer_read();

}



/*

 * On VHE system, we only need to configure trap on physical timer and counter

 * accesses in EL0 and EL1 once, not for every world switch.

 * The host kernel runs at EL2 with HCR_EL2.TGE == 1,

 * and this makes those bits have no effect for the host kernel execution.

 */

void kvm_timer_init_vhe(void)

{

	/* When HCR_EL2.E2H ==1, EL1PCEN and EL1PCTEN are shifted by 10 */

	u32 cnthctl_shift = 10;

	u64 val;



	/*

	 * Disallow physical timer access for the guest.

	 * Physical counter access is allowed.

	 */

	val = read_sysreg(cnthctl_el2);

	val &= ~(CNTHCTL_EL1PCEN << cnthctl_shift);

	val |= (CNTHCTL_EL1PCTEN << cnthctl_shift);

	write_sysreg(val, cnthctl_el2);

}