Re: [PATCH v4 10/15] KVM: arm64: Add config register bit definitions

From: Marc Zyngier <maz@kernel.org>
To: Fuad Tabba <tabba@google.com>
Cc: kvmarm@lists.cs.columbia.edu, will@kernel.org,
	james.morse@arm.com, alexandru.elisei@arm.com,
	suzuki.poulose@arm.com, mark.rutland@arm.com,
	christoffer.dall@arm.com, pbonzini@redhat.com,
	drjones@redhat.com, oupton@google.com, qperret@google.com,
	kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	kernel-team@android.com
Subject: Re: [PATCH v4 10/15] KVM: arm64: Add config register bit definitions
Date: Wed, 18 Aug 2021 16:16:04 +0100	[thread overview]
Message-ID: <87h7fmss0b.wl-maz@kernel.org> (raw)
In-Reply-To: <20210817081134.2918285-11-tabba@google.com>

On Tue, 17 Aug 2021 09:11:29 +0100,
Fuad Tabba <tabba@google.com> wrote:
> 
> Add hardware configuration register bit definitions for HCR_EL2
> and MDCR_EL2. Future patches toggle these hyp configuration
> register bits to trap on certain accesses.
> 
> No functional change intended.
> 
> Acked-by: Will Deacon <will@kernel.org>
> Signed-off-by: Fuad Tabba <tabba@google.com>
> ---
>  arch/arm64/include/asm/kvm_arm.h | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> index a928b2dc0b0f..327120c0089f 100644
> --- a/arch/arm64/include/asm/kvm_arm.h
> +++ b/arch/arm64/include/asm/kvm_arm.h
> @@ -12,8 +12,13 @@
>  #include <asm/types.h>
>  
>  /* Hyp Configuration Register (HCR) bits */
> +
> +#define HCR_TID5	(UL(1) << 58)
> +#define HCR_DCT		(UL(1) << 57)
>  #define HCR_ATA_SHIFT	56
>  #define HCR_ATA		(UL(1) << HCR_ATA_SHIFT)
> +#define HCR_AMVOFFEN	(UL(1) << 51)
> +#define HCR_FIEN	(UL(1) << 47)
>  #define HCR_FWB		(UL(1) << 46)
>  #define HCR_API		(UL(1) << 41)
>  #define HCR_APK		(UL(1) << 40)
> @@ -56,6 +61,7 @@
>  #define HCR_PTW		(UL(1) << 2)
>  #define HCR_SWIO	(UL(1) << 1)
>  #define HCR_VM		(UL(1) << 0)
> +#define HCR_RES0	((UL(1) << 48) | (UL(1) << 39))
>  
>  /*
>   * The bits we set in HCR:
> @@ -277,11 +283,21 @@
>  #define CPTR_EL2_TZ	(1 << 8)
>  #define CPTR_NVHE_EL2_RES1	0x000032ff /* known RES1 bits in CPTR_EL2 (nVHE) */
>  #define CPTR_EL2_DEFAULT	CPTR_NVHE_EL2_RES1
> +#define CPTR_NVHE_EL2_RES0	(GENMASK(63, 32) |	\
> +				 GENMASK(29, 21) |	\
> +				 GENMASK(19, 14) |	\
> +				 BIT(11))
>  
>  /* Hyp Debug Configuration Register bits */
>  #define MDCR_EL2_E2TB_MASK	(UL(0x3))
>  #define MDCR_EL2_E2TB_SHIFT	(UL(24))
> +#define MDCR_EL2_HPMFZS		(UL(1) << 36)
> +#define MDCR_EL2_HPMFZO		(UL(1) << 29)
> +#define MDCR_EL2_MTPME		(UL(1) << 28)
> +#define MDCR_EL2_TDCC		(UL(1) << 27)
> +#define MDCR_EL2_HCCD		(UL(1) << 23)

Nit: If you're aiming for completeness, you're missing MDCR_EL2.HLP
(bit 26).

>  #define MDCR_EL2_TTRF		(UL(1) << 19)
> +#define MDCR_EL2_HPMD		(UL(1) << 17)
>  #define MDCR_EL2_TPMS		(UL(1) << 14)
>  #define MDCR_EL2_E2PB_MASK	(UL(0x3))
>  #define MDCR_EL2_E2PB_SHIFT	(UL(12))
> @@ -293,6 +309,12 @@
>  #define MDCR_EL2_TPM		(UL(1) << 6)
>  #define MDCR_EL2_TPMCR		(UL(1) << 5)
>  #define MDCR_EL2_HPMN_MASK	(UL(0x1F))
> +#define MDCR_EL2_RES0		(GENMASK(63, 37) |	\
> +				 GENMASK(35, 30) |	\
> +				 GENMASK(25, 24) |	\
> +				 GENMASK(22, 20) |	\
> +				 BIT(18) |		\
> +				 GENMASK(16, 15))
>  
>  /* For compatibility with fault code shared with 32-bit */
>  #define FSC_FAULT	ESR_ELx_FSC_FAULT

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.

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