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Message-ID: <yq5aa5h52oyk.fsf@kernel.org>
Date: Thu, 22 Aug 2024 09:23:07 +0530
From: Aneesh Kumar K.V <aneesh.kumar@...nel.org>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
kvmarm@...ts.linux.dev
Cc: Steven Price <steven.price@....com>,
Catalin Marinas <catalin.marinas@....com>,
Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
James Morse <james.morse@....com>,
Oliver Upton <oliver.upton@...ux.dev>,
Suzuki K Poulose <suzuki.poulose@....com>,
Zenghui Yu <yuzenghui@...wei.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Joey Gouly <joey.gouly@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Christoffer Dall <christoffer.dall@....com>,
Fuad Tabba <tabba@...gle.com>, linux-coco@...ts.linux.dev,
Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
Gavin Shan <gshan@...hat.com>,
Shanker Donthineni <sdonthineni@...dia.com>,
Alper Gun <alpergun@...gle.com>
Subject: Re: [PATCH v4 18/43] arm64: RME: Handle realm enter/exit
Steven Price <steven.price@....com> writes:
> Entering a realm is done using a SMC call to the RMM. On exit the
> exit-codes need to be handled slightly differently to the normal KVM
> path so define our own functions for realm enter/exit and hook them
> in if the guest is a realm guest.
>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes since v2:
> * realm_set_ipa_state() now provides an output parameter for the
> top_iap that was changed. Use this to signal the VMM with the correct
> range that has been transitioned.
> * Adapt to previous patch changes.
> ---
> arch/arm64/include/asm/kvm_rme.h | 3 +
> arch/arm64/kvm/Makefile | 2 +-
> arch/arm64/kvm/arm.c | 19 +++-
> arch/arm64/kvm/rme-exit.c | 181 +++++++++++++++++++++++++++++++
> arch/arm64/kvm/rme.c | 11 ++
> 5 files changed, 210 insertions(+), 6 deletions(-)
> create mode 100644 arch/arm64/kvm/rme-exit.c
>
> diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_rme.h
> index c064bfb080ad..0e44b20cfa48 100644
> --- a/arch/arm64/include/asm/kvm_rme.h
> +++ b/arch/arm64/include/asm/kvm_rme.h
> @@ -96,6 +96,9 @@ void kvm_realm_destroy_rtts(struct kvm *kvm, u32 ia_bits);
> int kvm_create_rec(struct kvm_vcpu *vcpu);
> void kvm_destroy_rec(struct kvm_vcpu *vcpu);
>
> +int kvm_rec_enter(struct kvm_vcpu *vcpu);
> +int handle_rme_exit(struct kvm_vcpu *vcpu, int rec_run_status);
> +
> void kvm_realm_unmap_range(struct kvm *kvm,
> unsigned long ipa,
> u64 size,
> diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
> index 5e79e5eee88d..9f893e86cac9 100644
> --- a/arch/arm64/kvm/Makefile
> +++ b/arch/arm64/kvm/Makefile
> @@ -21,7 +21,7 @@ kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \
> vgic/vgic-mmio.o vgic/vgic-mmio-v2.o \
> vgic/vgic-mmio-v3.o vgic/vgic-kvm-device.o \
> vgic/vgic-its.o vgic/vgic-debug.o \
> - rme.o
> + rme.o rme-exit.o
>
> kvm-$(CONFIG_HW_PERF_EVENTS) += pmu-emul.o pmu.o
> kvm-$(CONFIG_ARM64_PTR_AUTH) += pauth.o
> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index 568e9e6e5a4e..e8dabb996705 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -1282,7 +1282,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
> trace_kvm_entry(*vcpu_pc(vcpu));
> guest_timing_enter_irqoff();
>
> - ret = kvm_arm_vcpu_enter_exit(vcpu);
> + if (vcpu_is_rec(vcpu))
> + ret = kvm_rec_enter(vcpu);
> + else
> + ret = kvm_arm_vcpu_enter_exit(vcpu);
>
> vcpu->mode = OUTSIDE_GUEST_MODE;
> vcpu->stat.exits++;
> @@ -1336,10 +1339,13 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
>
> local_irq_enable();
>
> - trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
> -
> /* Exit types that need handling before we can be preempted */
> - handle_exit_early(vcpu, ret);
> + if (!vcpu_is_rec(vcpu)) {
> + trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu),
> + *vcpu_pc(vcpu));
> +
> + handle_exit_early(vcpu, ret);
> + }
>
> preempt_enable();
>
> @@ -1362,7 +1368,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
> ret = ARM_EXCEPTION_IL;
> }
>
> - ret = handle_exit(vcpu, ret);
> + if (vcpu_is_rec(vcpu))
> + ret = handle_rme_exit(vcpu, ret);
> + else
> + ret = handle_exit(vcpu, ret);
> }
>
like kvm_rec_enter, should we name this as handle_rec_exit()?
arch/arm64/include/asm/kvm_rme.h | 2 +-
arch/arm64/kvm/arm.c | 2 +-
arch/arm64/kvm/rme-exit.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_rme.h
index a72e06cf4ea6..cd42c19ca21d 100644
--- a/arch/arm64/include/asm/kvm_rme.h
+++ b/arch/arm64/include/asm/kvm_rme.h
@@ -102,7 +102,7 @@ int kvm_create_rec(struct kvm_vcpu *vcpu);
void kvm_destroy_rec(struct kvm_vcpu *vcpu);
int kvm_rec_enter(struct kvm_vcpu *vcpu);
-int handle_rme_exit(struct kvm_vcpu *vcpu, int rec_run_status);
+int handle_rec_exit(struct kvm_vcpu *vcpu, int rec_run_status);
void kvm_realm_unmap_range(struct kvm *kvm,
unsigned long ipa,
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 05d9062470c2..1e34541d88db 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1391,7 +1391,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
}
if (vcpu_is_rec(vcpu))
- ret = handle_rme_exit(vcpu, ret);
+ ret = handle_rec_exit(vcpu, ret);
else
ret = handle_exit(vcpu, ret);
}
diff --git a/arch/arm64/kvm/rme-exit.c b/arch/arm64/kvm/rme-exit.c
index 0940575b0a14..f888cfe72dfa 100644
--- a/arch/arm64/kvm/rme-exit.c
+++ b/arch/arm64/kvm/rme-exit.c
@@ -156,7 +156,7 @@ static void update_arch_timer_irq_lines(struct kvm_vcpu *vcpu)
* Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
* proper exit to userspace.
*/
-int handle_rme_exit(struct kvm_vcpu *vcpu, int rec_run_ret)
+int handle_rec_exit(struct kvm_vcpu *vcpu, int rec_run_ret)
{
struct realm_rec *rec = &vcpu->arch.rec;
u8 esr_ec = ESR_ELx_EC(rec->run->exit.esr);
--
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