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KVM: arm64: Add a visibility bit to ignore user writes 

We're about to ignore writes to AArch32 ID registers on AArch64-only
systems. Add a bit to indicate a register is handled as write ignore
when accessed from userspace.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220913094441.3957645-6-oliver.upton@linux.dev
This commit is contained in:
Oliver Upton 2022-09-13 09:44:38 +00:00 committed by Marc Zyngier
parent 5d9a718b64
commit 4de06e4c1d
2 changed files with 10 additions and 0 deletions
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3
arch/arm64/kvm/sys_regs.c
View File

@ -2775,6 +2775,9 @@ int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
if (!r)
return -ENOENT;
if (sysreg_user_write_ignore(vcpu, r))
return 0;
if (r->set_user) {
ret = (r->set_user)(vcpu, r, val);
} else {

7
arch/arm64/kvm/sys_regs.h
View File

@ -86,6 +86,7 @@ struct sys_reg_desc {
#define REG_HIDDEN (1 << 0) /* hidden from userspace and guest */
#define REG_RAZ (1 << 1) /* RAZ from userspace and guest */
#define REG_USER_WI (1 << 2) /* WI from userspace only */
static __printf(2, 3)
inline void print_sys_reg_msg(const struct sys_reg_params *p,
@ -157,6 +158,12 @@ static inline bool sysreg_visible_as_raz(const struct kvm_vcpu *vcpu,
return sysreg_visibility(vcpu, r) & REG_RAZ;
}
static inline bool sysreg_user_write_ignore(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *r)
{
return sysreg_visibility(vcpu, r) & REG_USER_WI;
}
static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
const struct sys_reg_desc *i2)
{