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KVM: arm64: Introduce accessor for ctxt->sys_reg

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In order to allow the disintegration of the per-vcpu sysreg array,
let's introduce a new helper (ctxt_sys_reg()) that returns the
in-memory copy of a system register, picked from a given context.

__vcpu_sys_reg() is rewritten to use this helper.

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2019-06-26 19:57:41 +01:00
parent efaa5b93af
commit 1b422dd7fc
1 changed files with 10 additions and 5 deletions
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15
arch/arm64/include/asm/kvm_host.h
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@ -405,12 +405,17 @@ struct kvm_vcpu_arch {
#define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs)
/*
* Only use __vcpu_sys_reg if you know you want the memory backed version of a
* register, and not the one most recently accessed by a running VCPU. For
* example, for userspace access or for system registers that are never context
* switched, but only emulated.
* Only use __vcpu_sys_reg/ctxt_sys_reg if you know you want the
* memory backed version of a register, and not the one most recently
* accessed by a running VCPU. For example, for userspace access or
* for system registers that are never context switched, but only
* emulated.
*/
#define __vcpu_sys_reg(v,r) ((v)->arch.ctxt.sys_regs[(r)])
#define __ctxt_sys_reg(c,r) (&(c)->sys_regs[(r)])
#define ctxt_sys_reg(c,r) (*__ctxt_sys_reg(c,r))
#define __vcpu_sys_reg(v,r) (ctxt_sys_reg(&(v)->arch.ctxt, (r)))
u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg);
void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg);