[PATCH v9 06/21] KVM: ARM64: Add access handler for PMCEID0 and PMCEID1 register
From: Shannon Zhao <hidden>
Date: 2016-01-15 06:27:40
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
From: Shannon Zhao <redacted> Add access handler which gets host value of PMCEID0 or PMCEID1 when guest access these registers. Writing action to PMCEID0 or PMCEID1 is UNDEFINED. Signed-off-by: Shannon Zhao <redacted> --- arch/arm64/kvm/sys_regs.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index fc60041..06257e2 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c@@ -492,6 +492,27 @@ static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, return true; } +static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + u64 pmceid; + + if (!kvm_arm_pmu_v3_ready(vcpu)) + return trap_raz_wi(vcpu, p, r); + + if (p->is_write) + return false; + + if (!(p->Op2 & 1)) + asm volatile("mrs %0, pmceid0_el0\n" : "=r" (pmceid)); + else + asm volatile("mrs %0, pmceid1_el0\n" : "=r" (pmceid)); + + p->regval = pmceid; + + return true; +} + /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */ #define DBG_BCR_BVR_WCR_WVR_EL1(n) \ /* DBGBVRn_EL1 */ \
@@ -694,10 +715,10 @@ static const struct sys_reg_desc sys_reg_descs[] = { access_pmselr, reset_unknown, PMSELR_EL0 }, /* PMCEID0_EL0 */ { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110), - trap_raz_wi }, + access_pmceid }, /* PMCEID1_EL0 */ { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111), - trap_raz_wi }, + access_pmceid }, /* PMCCNTR_EL0 */ { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000), trap_raz_wi },
@@ -943,8 +964,8 @@ static const struct sys_reg_desc cp15_regs[] = { { Op1( 0), CRn( 9), CRm(12), Op2( 2), trap_raz_wi }, { Op1( 0), CRn( 9), CRm(12), Op2( 3), trap_raz_wi }, { Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmselr }, - { Op1( 0), CRn( 9), CRm(12), Op2( 6), trap_raz_wi }, - { Op1( 0), CRn( 9), CRm(12), Op2( 7), trap_raz_wi }, + { Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmceid }, + { Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmceid }, { Op1( 0), CRn( 9), CRm(13), Op2( 0), trap_raz_wi }, { Op1( 0), CRn( 9), CRm(13), Op2( 1), trap_raz_wi }, { Op1( 0), CRn( 9), CRm(13), Op2( 2), trap_raz_wi },
--
2.0.4