From: Marc Zyngier <maz@kernel.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Andrew Jones" <drjones@redhat.com>,
"Eric Auger" <eric.auger@redhat.com>,
"Gavin Shan" <gshan@redhat.com>, 张东旭 <xu910121@sina.com>,
dave.martin@arm.com, "James Morse" <james.morse@arm.com>,
"Julien Thierry" <julien.thierry.kdev@gmail.com>,
"Suzuki K Poulose" <suzuki.poulose@arm.com>,
kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/5] KVM: arm64: Remove AA64ZFR0_EL1 accessors
Date: Fri, 6 Nov 2020 16:44:16 +0000 [thread overview]
Message-ID: <20201106164416.326787-6-maz@kernel.org> (raw)
In-Reply-To: <20201106164416.326787-1-maz@kernel.org>
From: Andrew Jones <drjones@redhat.com>
The AA64ZFR0_EL1 accessors are just the general accessors with
its visibility function open-coded. It also skips the if-else
chain in read_id_reg, but there's no reason not to go there.
Indeed consolidating ID register accessors and removing lines
of code make it worthwhile.
Remove the AA64ZFR0_EL1 accessors, replacing them with the
general accessors for sanitized ID registers.
No functional change intended.
Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201105091022.15373-5-drjones@redhat.com
---
arch/arm64/kvm/sys_regs.c | 61 +++++++--------------------------------
1 file changed, 11 insertions(+), 50 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 4ee098abd87c..436043cd327e 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1154,6 +1154,16 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
static unsigned int id_visibility(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *r)
{
+ u32 id = sys_reg((u32)r->Op0, (u32)r->Op1,
+ (u32)r->CRn, (u32)r->CRm, (u32)r->Op2);
+
+ switch (id) {
+ case SYS_ID_AA64ZFR0_EL1:
+ if (!vcpu_has_sve(vcpu))
+ return REG_RAZ;
+ break;
+ }
+
return 0;
}
@@ -1201,55 +1211,6 @@ static unsigned int sve_visibility(const struct kvm_vcpu *vcpu,
return REG_HIDDEN;
}
-/* Generate the emulated ID_AA64ZFR0_EL1 value exposed to the guest */
-static u64 guest_id_aa64zfr0_el1(const struct kvm_vcpu *vcpu)
-{
- if (!vcpu_has_sve(vcpu))
- return 0;
-
- return read_sanitised_ftr_reg(SYS_ID_AA64ZFR0_EL1);
-}
-
-static bool access_id_aa64zfr0_el1(struct kvm_vcpu *vcpu,
- struct sys_reg_params *p,
- const struct sys_reg_desc *rd)
-{
- if (p->is_write)
- return write_to_read_only(vcpu, p, rd);
-
- p->regval = guest_id_aa64zfr0_el1(vcpu);
- return true;
-}
-
-static int get_id_aa64zfr0_el1(struct kvm_vcpu *vcpu,
- const struct sys_reg_desc *rd,
- const struct kvm_one_reg *reg, void __user *uaddr)
-{
- u64 val;
-
- val = guest_id_aa64zfr0_el1(vcpu);
- return reg_to_user(uaddr, &val, reg->id);
-}
-
-static int set_id_aa64zfr0_el1(struct kvm_vcpu *vcpu,
- const struct sys_reg_desc *rd,
- const struct kvm_one_reg *reg, void __user *uaddr)
-{
- const u64 id = sys_reg_to_index(rd);
- int err;
- u64 val;
-
- err = reg_from_user(&val, uaddr, id);
- if (err)
- return err;
-
- /* This is what we mean by invariant: you can't change it. */
- if (val != guest_id_aa64zfr0_el1(vcpu))
- return -EINVAL;
-
- return 0;
-}
-
/*
* cpufeature ID register user accessors
*
@@ -1506,7 +1467,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
ID_SANITISED(ID_AA64PFR1_EL1),
ID_UNALLOCATED(4,2),
ID_UNALLOCATED(4,3),
- { SYS_DESC(SYS_ID_AA64ZFR0_EL1), access_id_aa64zfr0_el1, .get_user = get_id_aa64zfr0_el1, .set_user = set_id_aa64zfr0_el1, },
+ ID_SANITISED(ID_AA64ZFR0_EL1),
ID_UNALLOCATED(4,5),
ID_UNALLOCATED(4,6),
ID_UNALLOCATED(4,7),
--
2.28.0
next prev parent reply other threads:[~2020-11-06 16:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-06 16:44 [GIT PULL] KVM/arm64 fixes for 5.10, take #2 Marc Zyngier
2020-11-06 16:44 ` [PATCH 1/5] KVM: arm64: Fix build error in user_mem_abort() Marc Zyngier
2020-11-06 16:44 ` [PATCH 2/5] KVM: arm64: Don't hide ID registers from userspace Marc Zyngier
2020-11-06 16:44 ` [PATCH 3/5] KVM: arm64: Consolidate REG_HIDDEN_GUEST/USER Marc Zyngier
2020-11-06 16:44 ` [PATCH 4/5] KVM: arm64: Check RAZ visibility in ID register accessors Marc Zyngier
2020-11-06 16:44 ` Marc Zyngier [this message]
2020-11-08 9:15 ` [GIT PULL] KVM/arm64 fixes for 5.10, take #2 Paolo Bonzini
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