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KVM: arm64: nv: Reload PMU events upon MDCR_EL2.HPME change

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MDCR_EL2.HPME is the 'global' enable bit for event counters reserved for
EL2. Give the PMU a kick when it's changed to ensure events are
reprogrammed before returning to the guest.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241217175550.3658212-1-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2024-12-17 09:55:50 -08:00
parent adf8623b3f
commit d3ba35b69e
1 changed files with 21 additions and 1 deletions
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22
arch/arm64/kvm/sys_regs.c
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@ -2448,6 +2448,26 @@ static unsigned int s1pie_el2_visibility(const struct kvm_vcpu *vcpu,
return __el2_visibility(vcpu, rd, s1pie_visibility);
}
static bool access_mdcr(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
u64 old = __vcpu_sys_reg(vcpu, MDCR_EL2);
if (!access_rw(vcpu, p, r))
return false;
/*
* Request a reload of the PMU to enable/disable the counters affected
* by HPME.
*/
if ((old ^ __vcpu_sys_reg(vcpu, MDCR_EL2)) & MDCR_EL2_HPME)
kvm_make_request(KVM_REQ_RELOAD_PMU, vcpu);
return true;
}
/*
* Architected system registers.
* Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
@ -2981,7 +3001,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
EL2_REG(SCTLR_EL2, access_rw, reset_val, SCTLR_EL2_RES1),
EL2_REG(ACTLR_EL2, access_rw, reset_val, 0),
EL2_REG_VNCR(HCR_EL2, reset_hcr, 0),
EL2_REG(MDCR_EL2, access_rw, reset_val, 0),
EL2_REG(MDCR_EL2, access_mdcr, reset_val, 0),
EL2_REG(CPTR_EL2, access_rw, reset_val, CPTR_NVHE_EL2_RES1),
EL2_REG_VNCR(HSTR_EL2, reset_val, 0),
EL2_REG_VNCR(HFGRTR_EL2, reset_val, 0),