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Message-Id: <20190121122457.760297173@linuxfoundation.org>
Date: Mon, 21 Jan 2019 14:43:36 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
Richard Henderson <richard.henderson@...aro.org>,
Mark Rutland <mark.rutland@....com>,
Christoffer Dall <christoffer.dall@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
kvmarm@...ts.cs.columbia.edu,
Kristina Martsenko <kristina.martsenko@....com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 11/59] arm64/kvm: consistently handle host HCR_EL2 flags
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
[ Backport of upstream commit 4eaed6aa2c628101246bcabc91b203bfac1193f8 ]
In KVM we define the configuration of HCR_EL2 for a VHE HOST in
HCR_HOST_VHE_FLAGS, but we don't have a similar definition for the
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, and consistently use both
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.
Reviewed-by: Marc Zyngier <marc.zyngier@....com>
Reviewed-by: Richard Henderson <richard.henderson@...aro.org>
Signed-off-by: Mark Rutland <mark.rutland@....com>
Reviewed-by: Christoffer Dall <christoffer.dall@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: kvmarm@...ts.cs.columbia.edu
Signed-off-by: Will Deacon <will.deacon@....com>
[kristina: backport to 4.14.y: adjust context]
Signed-off-by: Kristina Martsenko <kristina.martsenko@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
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 73cc4309fe01..9b25a1e2d583 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -82,6 +82,7 @@
HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW)
#define HCR_VIRT_EXCP_MASK (HCR_VSE | HCR_VI | HCR_VF)
#define HCR_INT_OVERRIDE (HCR_FMO | HCR_IMO)
+#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 261f3f88364c..ec393275ba04 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -414,10 +414,9 @@ CPU_LE( bic x0, x0, #(1 << 25) ) // Clear the EE bit for EL2
#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 b2f1992c6234..44845996b554 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -127,7 +127,7 @@ 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);
}
--
2.19.1
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