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KVM: arm64: nv: Add switching support for HFGxTR/HDFGxTR

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Now that we can evaluate the FGT registers, allow them to be merged
with the hypervisor's own configuration (in the case of HFG{RW}TR_EL2)
or simply set for HFGITR_EL2, HDGFRTR_EL2 and HDFGWTR_EL2.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Jing Zhang <jingzhangos@google.com>
Link: https://lore.kernel.org/r/20230815183903.2735724-26-maz@kernel.org
This commit is contained in:
Marc Zyngier
2023-08-15 19:38:59 +01:00
parent ea3b27d8de
commit d4d2dacc7c
1 changed files with 48 additions and 0 deletions
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48
arch/arm64/kvm/hyp/include/hyp/switch.h
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@@ -70,6 +70,13 @@ static inline void __activate_traps_fpsimd32(struct kvm_vcpu *vcpu)
}
}
#define compute_clr_set(vcpu, reg, clr, set) \
do { \
u64 hfg; \
hfg = __vcpu_sys_reg(vcpu, reg) & ~__ ## reg ## _RES0; \
set |= hfg & __ ## reg ## _MASK; \
clr |= ~hfg & __ ## reg ## _nMASK; \
} while(0)
static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
@@ -97,6 +104,10 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
if (cpus_have_final_cap(ARM64_WORKAROUND_AMPERE_AC03_CPU_38))
w_set |= HFGxTR_EL2_TCR_EL1_MASK;
if (vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu)) {
compute_clr_set(vcpu, HFGRTR_EL2, r_clr, r_set);
compute_clr_set(vcpu, HFGWTR_EL2, w_clr, w_set);
}
/* The default is not to trap anything but ACCDATA_EL1 */
r_val = __HFGRTR_EL2_nMASK & ~HFGxTR_EL2_nACCDATA_EL1;
@@ -109,6 +120,38 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
write_sysreg_s(r_val, SYS_HFGRTR_EL2);
write_sysreg_s(w_val, SYS_HFGWTR_EL2);
if (!vcpu_has_nv(vcpu) || is_hyp_ctxt(vcpu))
return;
ctxt_sys_reg(hctxt, HFGITR_EL2) = read_sysreg_s(SYS_HFGITR_EL2);
r_set = r_clr = 0;
compute_clr_set(vcpu, HFGITR_EL2, r_clr, r_set);
r_val = __HFGITR_EL2_nMASK;
r_val |= r_set;
r_val &= ~r_clr;
write_sysreg_s(r_val, SYS_HFGITR_EL2);
ctxt_sys_reg(hctxt, HDFGRTR_EL2) = read_sysreg_s(SYS_HDFGRTR_EL2);
ctxt_sys_reg(hctxt, HDFGWTR_EL2) = read_sysreg_s(SYS_HDFGWTR_EL2);
r_clr = r_set = w_clr = w_set = 0;
compute_clr_set(vcpu, HDFGRTR_EL2, r_clr, r_set);
compute_clr_set(vcpu, HDFGWTR_EL2, w_clr, w_set);
r_val = __HDFGRTR_EL2_nMASK;
r_val |= r_set;
r_val &= ~r_clr;
w_val = __HDFGWTR_EL2_nMASK;
w_val |= w_set;
w_val &= ~w_clr;
write_sysreg_s(r_val, SYS_HDFGRTR_EL2);
write_sysreg_s(w_val, SYS_HDFGWTR_EL2);
}
static inline void __deactivate_traps_hfgxtr(struct kvm_vcpu *vcpu)
@@ -121,7 +164,12 @@ static inline void __deactivate_traps_hfgxtr(struct kvm_vcpu *vcpu)
write_sysreg_s(ctxt_sys_reg(hctxt, HFGRTR_EL2), SYS_HFGRTR_EL2);
write_sysreg_s(ctxt_sys_reg(hctxt, HFGWTR_EL2), SYS_HFGWTR_EL2);
if (!vcpu_has_nv(vcpu) || is_hyp_ctxt(vcpu))
return;
write_sysreg_s(ctxt_sys_reg(hctxt, HFGITR_EL2), SYS_HFGITR_EL2);
write_sysreg_s(ctxt_sys_reg(hctxt, HDFGRTR_EL2), SYS_HDFGRTR_EL2);
write_sysreg_s(ctxt_sys_reg(hctxt, HDFGWTR_EL2), SYS_HDFGWTR_EL2);
}
static inline void __activate_traps_common(struct kvm_vcpu *vcpu)