From: Christoffer Dall <christoffer.dall@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org,
drjones@redhat.com, arnd@arndb.de, suzuki.poulose@arm.com,
marc.zyngier@arm.com, catalin.marinas@arm.com,
awallis@codeaurora.org, kernel-hardening@lists.openwall.com,
will.deacon@arm.com, linux-kernel@vger.kernel.org,
ramana.radhakrishnan@arm.com, kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCHv3 02/11] arm64/kvm: consistently handle host HCR_EL2 flags
Date: Fri, 27 Apr 2018 11:51:39 +0200 [thread overview]
Message-ID: <20180427095139.GH13249@C02W217FHV2R.local> (raw)
In-Reply-To: <20180417183735.56985-3-mark.rutland@arm.com>
On Tue, Apr 17, 2018 at 07:37:26PM +0100, Mark Rutland wrote:
> In KVM we define the configuration of HCR_EL2 for a VHE HOST in
> HCR_HOST_VHE_FLAGS, but we don't ahve a similar definition for the
nit: have
> non-VHE host flags, and open-code HCR_RW. Further, in head.S we
> open-code the flags for VHE and non-VHE configurations.
>
> In future, we're going to want to configure more flags for the host, so
> lets add a HCR_HOST_NVHE_FLAGS defintion, adn consistently use both
nit: and
> HCR_HOST_VHE_FLAGS and HCR_HOST_NVHE_FLAGS in the kvm code and head.S.
>
> We now use mov_q to generate the HCR_EL2 value, as we use when
> configuring other registers in head.S.
>
> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Christoffer Dall <cdall@kernel.org>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: kvmarm@lists.cs.columbia.edu
> ---
> arch/arm64/include/asm/kvm_arm.h | 1 +
> arch/arm64/kernel/head.S | 5 ++---
> arch/arm64/kvm/hyp/switch.c | 2 +-
> 3 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> index 6dd285e979c9..89b3dda7e3cb 100644
> --- a/arch/arm64/include/asm/kvm_arm.h
> +++ b/arch/arm64/include/asm/kvm_arm.h
> @@ -86,6 +86,7 @@
> HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW | HCR_TLOR | \
> HCR_FMO | HCR_IMO)
> #define HCR_VIRT_EXCP_MASK (HCR_VSE | HCR_VI | HCR_VF)
> +#define HCR_HOST_NVHE_FLAGS (HCR_RW)
> #define HCR_HOST_VHE_FLAGS (HCR_RW | HCR_TGE | HCR_E2H)
>
> /* TCR_EL2 Registers bits */
> diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
> index b0853069702f..651a06b1980f 100644
> --- a/arch/arm64/kernel/head.S
> +++ b/arch/arm64/kernel/head.S
> @@ -494,10 +494,9 @@ ENTRY(el2_setup)
> #endif
>
> /* Hyp configuration. */
> - mov x0, #HCR_RW // 64-bit EL1
> + mov_q x0, HCR_HOST_NVHE_FLAGS
> cbz x2, set_hcr
> - orr x0, x0, #HCR_TGE // Enable Host Extensions
> - orr x0, x0, #HCR_E2H
> + mov_q x0, HCR_HOST_VHE_FLAGS
> set_hcr:
> msr hcr_el2, x0
> isb
> diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
> index d9645236e474..cdae330e15e9 100644
> --- a/arch/arm64/kvm/hyp/switch.c
> +++ b/arch/arm64/kvm/hyp/switch.c
> @@ -143,7 +143,7 @@ static void __hyp_text __deactivate_traps_nvhe(void)
> mdcr_el2 |= MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT;
>
> write_sysreg(mdcr_el2, mdcr_el2);
> - write_sysreg(HCR_RW, hcr_el2);
> + write_sysreg(HCR_HOST_NVHE_FLAGS, hcr_el2);
> write_sysreg(CPTR_EL2_DEFAULT, cptr_el2);
> }
>
> --
> 2.11.0
>
>
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
next prev parent reply other threads:[~2018-04-27 9:51 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-17 18:37 [PATCHv3 00/11] ARMv8.3 pointer authentication userspace support Mark Rutland
2018-04-17 18:37 ` [PATCHv3 01/11] arm64: add pointer authentication register bits Mark Rutland
2018-04-17 18:37 ` [PATCHv3 02/11] arm64/kvm: consistently handle host HCR_EL2 flags Mark Rutland
2018-04-27 9:51 ` Christoffer Dall [this message]
2018-04-27 10:13 ` Mark Rutland
2018-04-17 18:37 ` [PATCHv3 03/11] arm64/kvm: hide ptrauth from guests Mark Rutland
2018-04-18 13:19 ` Andrew Jones
2018-04-18 13:47 ` Mark Rutland
2018-04-27 9:51 ` Christoffer Dall
2018-04-17 18:37 ` [PATCHv3 04/11] arm64: Don't trap host pointer auth use to EL2 Mark Rutland
2018-04-27 9:52 ` Christoffer Dall
2018-04-17 18:37 ` [PATCHv3 05/11] arm64/cpufeature: detect pointer authentication Mark Rutland
2018-04-17 18:37 ` [PATCHv3 06/11] asm-generic: mm_hooks: allow hooks to be overridden individually Mark Rutland
2018-04-17 19:56 ` Arnd Bergmann
2018-04-18 11:38 ` Mark Rutland
2018-04-17 18:37 ` [PATCHv3 07/11] arm64: add basic pointer authentication support Mark Rutland
2018-04-25 11:23 ` Catalin Marinas
2018-04-27 10:27 ` Mark Rutland
2018-04-17 18:37 ` [PATCHv3 08/11] arm64: expose user PAC bit positions via ptrace Mark Rutland
2018-04-17 18:37 ` [PATCHv3 09/11] arm64: perf: strip PAC when unwinding userspace Mark Rutland
2018-04-17 18:37 ` [PATCHv3 10/11] arm64: enable pointer authentication Mark Rutland
2018-04-17 18:37 ` [PATCHv3 11/11] arm64: docs: document " Mark Rutland
2018-04-22 8:05 ` Pavel Machek
2018-04-22 8:47 ` Marc Zyngier
2018-04-22 9:00 ` Pavel Machek
2018-04-25 12:27 ` Catalin Marinas
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