This is a note to let you know that I've just added the patch titled
KVM: arm64: Don't hide ID registers from userspace
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-arm64-don-t-hide-id-registers-from-userspace.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f81cb2c3ad41ac6d8cb2650e3d72d5f67db1aa28 Mon Sep 17 00:00:00 2001
From: Andrew Jones <drjones@xxxxxxxxxx>
Date: Thu, 5 Nov 2020 10:10:19 +0100
Subject: KVM: arm64: Don't hide ID registers from userspace
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From: Andrew Jones <drjones@xxxxxxxxxx>
commit f81cb2c3ad41ac6d8cb2650e3d72d5f67db1aa28 upstream.
ID registers are RAZ until they've been allocated a purpose, but
that doesn't mean they should be removed from the KVM_GET_REG_LIST
list. So far we only have one register, SYS_ID_AA64ZFR0_EL1, that
is hidden from userspace when its function, SVE, is not present.
Expose SYS_ID_AA64ZFR0_EL1 to userspace as RAZ when SVE is not
implemented. Removing the userspace visibility checks is enough
to reexpose it, as it will already return zero to userspace when
SVE is not present. The register already behaves as RAZ for the
guest when SVE is not present.
Fixes: 73433762fcae ("KVM: arm64/sve: System register context switch and access support")
Reported-by: 张东旭 <xu910121@xxxxxxxx>
Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx#v5.2+
Link: https://lore.kernel.org/r/20201105091022.15373-2-drjones@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 18 +-----------------
1 file changed, 1 insertion(+), 17 deletions(-)
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1132,16 +1132,6 @@ static unsigned int sve_visibility(const
return REG_HIDDEN_USER | REG_HIDDEN_GUEST;
}
-/* Visibility overrides for SVE-specific ID registers */
-static unsigned int sve_id_visibility(const struct kvm_vcpu *vcpu,
- const struct sys_reg_desc *rd)
-{
- if (vcpu_has_sve(vcpu))
- return 0;
-
- return REG_HIDDEN_USER;
-}
-
/* Generate the emulated ID_AA64ZFR0_EL1 value exposed to the guest */
static u64 guest_id_aa64zfr0_el1(const struct kvm_vcpu *vcpu)
{
@@ -1168,9 +1158,6 @@ static int get_id_aa64zfr0_el1(struct kv
{
u64 val;
- if (WARN_ON(!vcpu_has_sve(vcpu)))
- return -ENOENT;
-
val = guest_id_aa64zfr0_el1(vcpu);
return reg_to_user(uaddr, &val, reg->id);
}
@@ -1183,9 +1170,6 @@ static int set_id_aa64zfr0_el1(struct kv
int err;
u64 val;
- if (WARN_ON(!vcpu_has_sve(vcpu)))
- return -ENOENT;
-
err = reg_from_user(&val, uaddr, id);
if (err)
return err;
@@ -1448,7 +1432,7 @@ static const struct sys_reg_desc sys_reg
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, .visibility = sve_id_visibility },
+ { SYS_DESC(SYS_ID_AA64ZFR0_EL1), access_id_aa64zfr0_el1, .get_user = get_id_aa64zfr0_el1, .set_user = set_id_aa64zfr0_el1, },
ID_UNALLOCATED(4,5),
ID_UNALLOCATED(4,6),
ID_UNALLOCATED(4,7),
Patches currently in stable-queue which might be from drjones@xxxxxxxxxx are
queue-5.4/kvm-arm64-don-t-hide-id-registers-from-userspace.patch
