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Date: Tue, 26 May 2020 11:45:07 +0100
From: Mark Rutland <mark.rutland@....com>
To: Gavin Shan <gshan@...hat.com>
Cc: kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, maz@...nel.org, will@...nel.org,
catalin.marinas@....com, james.morse@....com,
suzuki.poulose@....com, drjones@...hat.com, eric.auger@...hat.com,
aarcange@...hat.com, shan.gavin@...il.com
Subject: Re: [PATCH RFCv2 5/9] kvm/arm64: Replace hsr with esr
On Fri, May 08, 2020 at 01:29:15PM +1000, Gavin Shan wrote:
> This replace the variable names to make them self-explaining. The
> tracepoint isn't changed accordingly because they're part of ABI:
>
> * @hsr to @esr
> * @hsr_ec to @ec
> * Use kvm_vcpu_trap_get_class() helper if possible
>
> Signed-off-by: Gavin Shan <gshan@...hat.com>
As with patch 3, I think this cleanup makes sense independent from the
rest of the series, and I think it'd make sense to bundle all the
patches renaming hsr -> esr, and send those as a preparatory series.
Thanks,
Mark.
> ---
> arch/arm64/kvm/handle_exit.c | 28 ++++++++++++++--------------
> arch/arm64/kvm/hyp/switch.c | 9 ++++-----
> arch/arm64/kvm/sys_regs.c | 30 +++++++++++++++---------------
> 3 files changed, 33 insertions(+), 34 deletions(-)
>
> diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
> index 00858db82a64..e3b3dcd5b811 100644
> --- a/arch/arm64/kvm/handle_exit.c
> +++ b/arch/arm64/kvm/handle_exit.c
> @@ -123,13 +123,13 @@ static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
> */
> static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run)
> {
> - u32 hsr = kvm_vcpu_get_esr(vcpu);
> + u32 esr = kvm_vcpu_get_esr(vcpu);
> int ret = 0;
>
> run->exit_reason = KVM_EXIT_DEBUG;
> - run->debug.arch.hsr = hsr;
> + run->debug.arch.hsr = esr;
>
> - switch (ESR_ELx_EC(hsr)) {
> + switch (kvm_vcpu_trap_get_class(esr)) {
> case ESR_ELx_EC_WATCHPT_LOW:
> run->debug.arch.far = vcpu->arch.fault.far_el2;
> /* fall through */
> @@ -139,8 +139,8 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run)
> case ESR_ELx_EC_BRK64:
> break;
> default:
> - kvm_err("%s: un-handled case hsr: %#08x\n",
> - __func__, (unsigned int) hsr);
> + kvm_err("%s: un-handled case esr: %#08x\n",
> + __func__, (unsigned int)esr);
> ret = -1;
> break;
> }
> @@ -150,10 +150,10 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run)
>
> static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run)
> {
> - u32 hsr = kvm_vcpu_get_esr(vcpu);
> + u32 esr = kvm_vcpu_get_esr(vcpu);
>
> - kvm_pr_unimpl("Unknown exception class: hsr: %#08x -- %s\n",
> - hsr, esr_get_class_string(hsr));
> + kvm_pr_unimpl("Unknown exception class: esr: %#08x -- %s\n",
> + esr, esr_get_class_string(esr));
>
> kvm_inject_undefined(vcpu);
> return 1;
> @@ -230,10 +230,10 @@ static exit_handle_fn arm_exit_handlers[] = {
>
> static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
> {
> - u32 hsr = kvm_vcpu_get_esr(vcpu);
> - u8 hsr_ec = ESR_ELx_EC(hsr);
> + u32 esr = kvm_vcpu_get_esr(vcpu);
> + u8 ec = kvm_vcpu_trap_get_class(esr);
>
> - return arm_exit_handlers[hsr_ec];
> + return arm_exit_handlers[ec];
> }
>
> /*
> @@ -273,15 +273,15 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
> {
> if (ARM_SERROR_PENDING(exception_index)) {
> u32 esr = kvm_vcpu_get_esr(vcpu);
> - u8 hsr_ec = ESR_ELx_EC(esr);
> + u8 ec = kvm_vcpu_trap_get_class(esr);
>
> /*
> * HVC/SMC already have an adjusted PC, which we need
> * to correct in order to return to after having
> * injected the SError.
> */
> - if (hsr_ec == ESR_ELx_EC_HVC32 || hsr_ec == ESR_ELx_EC_HVC64 ||
> - hsr_ec == ESR_ELx_EC_SMC32 || hsr_ec == ESR_ELx_EC_SMC64) {
> + if (ec == ESR_ELx_EC_HVC32 || ec == ESR_ELx_EC_HVC64 ||
> + ec == ESR_ELx_EC_SMC32 || ec == ESR_ELx_EC_SMC64) {
> u32 adj = kvm_vcpu_trap_il_is32bit(esr) ? 4 : 2;
> *vcpu_pc(vcpu) -= adj;
> }
> diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
> index 369f22f49f3d..7bf4840bf90e 100644
> --- a/arch/arm64/kvm/hyp/switch.c
> +++ b/arch/arm64/kvm/hyp/switch.c
> @@ -356,8 +356,8 @@ static bool __hyp_text __populate_fault_info(struct kvm_vcpu *vcpu)
> static bool __hyp_text __hyp_handle_fpsimd(struct kvm_vcpu *vcpu)
> {
> u32 esr = kvm_vcpu_get_esr(vcpu);
> + u8 ec = kvm_vcpu_trap_get_class(esr);
> bool vhe, sve_guest, sve_host;
> - u8 hsr_ec;
>
> if (!system_supports_fpsimd())
> return false;
> @@ -372,14 +372,13 @@ static bool __hyp_text __hyp_handle_fpsimd(struct kvm_vcpu *vcpu)
> vhe = has_vhe();
> }
>
> - hsr_ec = kvm_vcpu_trap_get_class(esr);
> - if (hsr_ec != ESR_ELx_EC_FP_ASIMD &&
> - hsr_ec != ESR_ELx_EC_SVE)
> + if (ec != ESR_ELx_EC_FP_ASIMD &&
> + ec != ESR_ELx_EC_SVE)
> return false;
>
> /* Don't handle SVE traps for non-SVE vcpus here: */
> if (!sve_guest)
> - if (hsr_ec != ESR_ELx_EC_FP_ASIMD)
> + if (ec != ESR_ELx_EC_FP_ASIMD)
> return false;
>
> /* Valid trap. Switch the context: */
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 012fff834a4b..58f81ab519af 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -2182,10 +2182,10 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
> struct sys_reg_params *params)
> {
> u32 esr = kvm_vcpu_get_esr(vcpu);
> - u8 hsr_ec = kvm_vcpu_trap_get_class(esr);
> + u8 ec = kvm_vcpu_trap_get_class(esr);
> int cp = -1;
>
> - switch(hsr_ec) {
> + switch (ec) {
> case ESR_ELx_EC_CP15_32:
> case ESR_ELx_EC_CP15_64:
> cp = 15;
> @@ -2216,17 +2216,17 @@ static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
> size_t nr_specific)
> {
> struct sys_reg_params params;
> - u32 hsr = kvm_vcpu_get_esr(vcpu);
> - int Rt = kvm_vcpu_sys_get_rt(hsr);
> - int Rt2 = (hsr >> 10) & 0x1f;
> + u32 esr = kvm_vcpu_get_esr(vcpu);
> + int Rt = kvm_vcpu_sys_get_rt(esr);
> + int Rt2 = (esr >> 10) & 0x1f;
>
> params.is_aarch32 = true;
> params.is_32bit = false;
> - params.CRm = (hsr >> 1) & 0xf;
> - params.is_write = ((hsr & 1) == 0);
> + params.CRm = (esr >> 1) & 0xf;
> + params.is_write = ((esr & 1) == 0);
>
> params.Op0 = 0;
> - params.Op1 = (hsr >> 16) & 0xf;
> + params.Op1 = (esr >> 16) & 0xf;
> params.Op2 = 0;
> params.CRn = 0;
>
> @@ -2273,18 +2273,18 @@ static int kvm_handle_cp_32(struct kvm_vcpu *vcpu,
> size_t nr_specific)
> {
> struct sys_reg_params params;
> - u32 hsr = kvm_vcpu_get_esr(vcpu);
> - int Rt = kvm_vcpu_sys_get_rt(hsr);
> + u32 esr = kvm_vcpu_get_esr(vcpu);
> + int Rt = kvm_vcpu_sys_get_rt(esr);
>
> params.is_aarch32 = true;
> params.is_32bit = true;
> - params.CRm = (hsr >> 1) & 0xf;
> + params.CRm = (esr >> 1) & 0xf;
> params.regval = vcpu_get_reg(vcpu, Rt);
> - params.is_write = ((hsr & 1) == 0);
> - params.CRn = (hsr >> 10) & 0xf;
> + params.is_write = ((esr & 1) == 0);
> + params.CRn = (esr >> 10) & 0xf;
> params.Op0 = 0;
> - params.Op1 = (hsr >> 14) & 0x7;
> - params.Op2 = (hsr >> 17) & 0x7;
> + params.Op1 = (esr >> 14) & 0x7;
> + params.Op2 = (esr >> 17) & 0x7;
>
> if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific) ||
> !emulate_cp(vcpu, ¶ms, global, nr_global)) {
> --
> 2.23.0
>
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