Re: [PATCH v5 31/69] KVM: arm64: nv: Respect the virtual HCR_EL2.NV1 bit setting
From: Marc Zyngier <maz@kernel.org>
Date: 2021-12-20 09:41:23
Also in:
kvm, kvmarm
On Mon, 20 Dec 2021 07:18:51 +0000, Ganapatrao Kulkarni [off-list ref] wrote:
On 30-11-2021 01:31 am, Marc Zyngier wrote:quoted
From: Jintack Lim <redacted> Forward ELR_EL1, SPSR_EL1 and VBAR_EL1 traps to the virtual EL2 if the virtual HCR_EL2.NV bit is set. This is for recursive nested virtualization. Signed-off-by: Jintack Lim <redacted> Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/kvm/sys_regs.c | 28 +++++++++++++++++++++++++++- 2 files changed, 28 insertions(+), 1 deletion(-)diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 9759bc893a51..68af5509e4b0 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h@@ -20,6 +20,7 @@ #define HCR_AMVOFFEN (UL(1) << 51) #define HCR_FIEN (UL(1) << 47) #define HCR_FWB (UL(1) << 46) +#define HCR_NV1 (UL(1) << 43) #define HCR_NV (UL(1) << 42) #define HCR_API (UL(1) << 41) #define HCR_APK (UL(1) << 40)diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index e96877fc3b2a..511e06b6f603 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c@@ -288,6 +288,22 @@ static bool access_rw(struct kvm_vcpu *vcpu, return true; } +/* This function is to support the recursive nestedvirtualization */ +static bool forward_nv1_traps(struct kvm_vcpu *vcpu, struct sys_reg_params *p) +{ + return forward_traps(vcpu, HCR_NV1); +} +Shall we move this helper to emulate-nested.c?
Sure, that shouldn't be a problem. M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel