debug-sr.c File Reference

#include <hyp/debug-sr.h>
#include <linux/compiler.h>
#include <linux/kvm_host.h>
#include <asm/debug-monitors.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>

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Functions
static void	__debug_save_spe (u64 *pmscr_el1)
static void	__debug_restore_spe (u64 pmscr_el1)
static void	__debug_save_trace (u64 *trfcr_el1)
static void	__debug_restore_trace (u64 trfcr_el1)
void	__debug_save_host_buffers_nvhe (struct kvm_vcpu *vcpu)
void	__debug_switch_to_guest (struct kvm_vcpu *vcpu)
void	__debug_restore_host_buffers_nvhe (struct kvm_vcpu *vcpu)
void	__debug_switch_to_host (struct kvm_vcpu *vcpu)
u64	__kvm_get_mdcr_el2 (void)

Function Documentation

__debug_restore_host_buffers_nvhe()

void __debug_restore_host_buffers_nvhe

(

struct kvm_vcpu *

vcpu

)

Definition at line 97 of file debug-sr.c.

{
    if (vcpu_get_flag(vcpu, DEBUG_STATE_SAVE_SPE))
        __debug_restore_spe(vcpu->arch.host_debug_state.pmscr_el1);
    if (vcpu_get_flag(vcpu, DEBUG_STATE_SAVE_TRBE))
        __debug_restore_trace(vcpu->arch.host_debug_state.trfcr_el1);
}

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__debug_restore_spe()

static void __debug_restore_spe ( u64  pmscr_el1 )

static

Definition at line 42 of file debug-sr.c.

{
    if (!pmscr_el1)
        return;
 
    /* The host page table is installed, but not yet synchronised */
    isb();
 
    /* Re-enable data generation */
    write_sysreg_s(pmscr_el1, SYS_PMSCR_EL1);
}

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__debug_restore_trace()

static void __debug_restore_trace ( u64  trfcr_el1 )

static

Definition at line 73 of file debug-sr.c.

{
    if (!trfcr_el1)
        return;
 
    /* Restore trace filter controls */
    write_sysreg_s(trfcr_el1, SYS_TRFCR_EL1);
}

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__debug_save_host_buffers_nvhe()

void __debug_save_host_buffers_nvhe

(

struct kvm_vcpu *

vcpu

)

Definition at line 82 of file debug-sr.c.

{
    /* Disable and flush SPE data generation */
    if (vcpu_get_flag(vcpu, DEBUG_STATE_SAVE_SPE))
        __debug_save_spe(&vcpu->arch.host_debug_state.pmscr_el1);
    /* Disable and flush Self-Hosted Trace generation */
    if (vcpu_get_flag(vcpu, DEBUG_STATE_SAVE_TRBE))
        __debug_save_trace(&vcpu->arch.host_debug_state.trfcr_el1);
}

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__debug_save_spe()

static void __debug_save_spe ( u64 *  pmscr_el1 )

static

Definition at line 17 of file debug-sr.c.

{
    u64 reg;
 
    /* Clear pmscr in case of early return */
    *pmscr_el1 = 0;
 
    /*
     * At this point, we know that this CPU implements
     * SPE and is available to the host.
     * Check if the host is actually using it ?
     */
    reg = read_sysreg_s(SYS_PMBLIMITR_EL1);
    if (!(reg & BIT(PMBLIMITR_EL1_E_SHIFT)))
        return;
 
    /* Yes; save the control register and disable data generation */
    *pmscr_el1 = read_sysreg_s(SYS_PMSCR_EL1);
    write_sysreg_s(0, SYS_PMSCR_EL1);
    isb();
 
    /* Now drain all buffered data to memory */
    psb_csync();
}

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__debug_save_trace()

static void __debug_save_trace ( u64 *  trfcr_el1 )

static

Definition at line 54 of file debug-sr.c.

{
    *trfcr_el1 = 0;
 
    /* Check if the TRBE is enabled */
    if (!(read_sysreg_s(SYS_TRBLIMITR_EL1) & TRBLIMITR_EL1_E))
        return;
    /*
     * Prohibit trace generation while we are in guest.
     * Since access to TRFCR_EL1 is trapped, the guest can't
     * modify the filtering set by the host.
     */
    *trfcr_el1 = read_sysreg_s(SYS_TRFCR_EL1);
    write_sysreg_s(0, SYS_TRFCR_EL1);
    isb();
    /* Drain the trace buffer to memory */
    tsb_csync();
}

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__debug_switch_to_guest()

void __debug_switch_to_guest

(

struct kvm_vcpu *

vcpu

)

Definition at line 92 of file debug-sr.c.

{
    __debug_switch_to_guest_common(vcpu);
}

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__debug_switch_to_host()

void __debug_switch_to_host

(

struct kvm_vcpu *

vcpu

)

Definition at line 105 of file debug-sr.c.

{
    __debug_switch_to_host_common(vcpu);
}

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__kvm_get_mdcr_el2()

u64 __kvm_get_mdcr_el2

(

void

)

Definition at line 110 of file debug-sr.c.

{
    return read_sysreg(mdcr_el2);
}

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