4.4-stable review patch. If anyone has any objections, please let me know.
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[ 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@arm.com Reviewed-by: Richard Henderson richard.henderson@linaro.org Signed-off-by: Mark Rutland mark.rutland@arm.com Reviewed-by: Christoffer Dall christoffer.dall@arm.com Cc: Catalin Marinas catalin.marinas@arm.com Cc: Marc Zyngier marc.zyngier@arm.com Cc: Will Deacon will.deacon@arm.com Cc: kvmarm@lists.cs.columbia.edu Signed-off-by: Will Deacon will.deacon@arm.com [kristina: backport to 4.4.y: non-VHE only; __deactivate_traps_nvhe in assembly; add #include] Signed-off-by: Kristina Martsenko kristina.martsenko@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/kernel/head.S | 3 ++- arch/arm64/kvm/hyp.S | 2 +- 3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index ef8e13d379cb..013b7de45ee7 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -81,6 +81,7 @@ HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW) #define HCR_VIRT_EXCP_MASK (HCR_VA | HCR_VI | HCR_VF) #define HCR_INT_OVERRIDE (HCR_FMO | HCR_IMO) +#define HCR_HOST_NVHE_FLAGS (HCR_RW)
/* Hyp System Control Register (SCTLR_EL2) bits */ diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index d019c3a58cc2..0382eba4bf7b 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -30,6 +30,7 @@ #include <asm/cache.h> #include <asm/cputype.h> #include <asm/kernel-pgtable.h> +#include <asm/kvm_arm.h> #include <asm/memory.h> #include <asm/pgtable-hwdef.h> #include <asm/pgtable.h> @@ -464,7 +465,7 @@ CPU_LE( bic x0, x0, #(3 << 24) ) // Clear the EE and E0E bits for EL1 ret
/* Hyp configuration. */ -2: mov x0, #(1 << 31) // 64-bit EL1 +2: mov_q x0, HCR_HOST_NVHE_FLAGS msr hcr_el2, x0
/* Generic timers. */ diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index 86c289832272..8d3da858c257 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -494,7 +494,7 @@ .endm
.macro deactivate_traps - mov x2, #HCR_RW + mov_q x2, HCR_HOST_NVHE_FLAGS msr hcr_el2, x2 msr hstr_el2, xzr