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[104.155.91.135]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49240f054e3sm57555245e9.2.2026.06.19.06.26.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jun 2026 06:26:38 -0700 (PDT) Date: Fri, 19 Jun 2026 14:26:34 +0100 From: Vincent Donnefort To: Fuad Tabba Cc: Marc Zyngier , Oliver Upton , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Quentin Perret , Sebastian Ene , Hyunwoo Kim Subject: Re: [PATCH v2 2/8] KVM: arm64: Make vcpu_{read,write}_sys_reg available to HYP code Message-ID: References: <20260619070719.812227-1-tabba@google.com> <20260619070719.812227-3-tabba@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260619070719.812227-3-tabba@google.com> On Fri, Jun 19, 2026 at 08:07:13AM +0100, Fuad Tabba wrote: > The vcpu_{read,write}_sys_reg() accessors are host-only, so helpers > built on them such as kvm_vcpu_set_be()/kvm_vcpu_is_be() cannot be > shared with hyp code. exception.c already wraps them in > __vcpu_{read,write}_sys_reg(), which pick the host- or hyp-side accessor > via has_vhe() and so are valid in any context. > > Move those wrappers to kvm_emulate.h as kvm_vcpu_{read,write}_sys_reg() > and switch the callers over, so a follow-up series can share that > emulation code at EL2. > > No functional change intended. > > Signed-off-by: Fuad Tabba Reviewed-by: Vincent Donnefort > --- > arch/arm64/include/asm/kvm_emulate.h | 22 +++++++++++++++--- > arch/arm64/kvm/hyp/exception.c | 34 ++++++++-------------------- > 2 files changed, 28 insertions(+), 28 deletions(-) > > diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h > index 5bf3d7e1d92c..80b30fead3d1 100644 > --- a/arch/arm64/include/asm/kvm_emulate.h > +++ b/arch/arm64/include/asm/kvm_emulate.h > @@ -506,6 +506,22 @@ static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu) > return __vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK; > } > > +static inline u64 kvm_vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg) > +{ > + if (has_vhe()) > + return vcpu_read_sys_reg(vcpu, reg); > + > + return __vcpu_sys_reg(vcpu, reg); > +} > + > +static inline void kvm_vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg) > +{ > + if (has_vhe()) > + vcpu_write_sys_reg(vcpu, val, reg); > + else > + __vcpu_assign_sys_reg(vcpu, reg, val); > +} > + > static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) > { > if (vcpu_mode_is_32bit(vcpu)) { > @@ -516,9 +532,9 @@ static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) > > r = vcpu_has_nv(vcpu) ? SCTLR_EL2 : SCTLR_EL1; > > - sctlr = vcpu_read_sys_reg(vcpu, r); > + sctlr = kvm_vcpu_read_sys_reg(vcpu, r); > sctlr |= SCTLR_ELx_EE; > - vcpu_write_sys_reg(vcpu, sctlr, r); > + kvm_vcpu_write_sys_reg(vcpu, sctlr, r); > } > } > > @@ -533,7 +549,7 @@ static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu) > r = is_hyp_ctxt(vcpu) ? SCTLR_EL2 : SCTLR_EL1; > bit = vcpu_mode_priv(vcpu) ? SCTLR_ELx_EE : SCTLR_EL1_E0E; > > - return vcpu_read_sys_reg(vcpu, r) & bit; > + return kvm_vcpu_read_sys_reg(vcpu, r) & bit; > } > > static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu, > diff --git a/arch/arm64/kvm/hyp/exception.c b/arch/arm64/kvm/hyp/exception.c > index bef40ddb16db..2cb68dc7d441 100644 > --- a/arch/arm64/kvm/hyp/exception.c > +++ b/arch/arm64/kvm/hyp/exception.c > @@ -20,22 +20,6 @@ > #error Hypervisor code only! > #endif > > -static inline u64 __vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg) > -{ > - if (has_vhe()) > - return vcpu_read_sys_reg(vcpu, reg); > - > - return __vcpu_sys_reg(vcpu, reg); > -} > - > -static inline void __vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg) > -{ > - if (has_vhe()) > - vcpu_write_sys_reg(vcpu, val, reg); > - else > - __vcpu_assign_sys_reg(vcpu, reg, val); > -} > - > static void __vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long target_mode, > u64 val) > { > @@ -101,14 +85,14 @@ static void enter_exception64(struct kvm_vcpu *vcpu, unsigned long target_mode, > > switch (target_mode) { > case PSR_MODE_EL1h: > - vbar = __vcpu_read_sys_reg(vcpu, VBAR_EL1); > - sctlr = __vcpu_read_sys_reg(vcpu, SCTLR_EL1); > - __vcpu_write_sys_reg(vcpu, *vcpu_pc(vcpu), ELR_EL1); > + vbar = kvm_vcpu_read_sys_reg(vcpu, VBAR_EL1); > + sctlr = kvm_vcpu_read_sys_reg(vcpu, SCTLR_EL1); > + kvm_vcpu_write_sys_reg(vcpu, *vcpu_pc(vcpu), ELR_EL1); > break; > case PSR_MODE_EL2h: > - vbar = __vcpu_read_sys_reg(vcpu, VBAR_EL2); > - sctlr = __vcpu_read_sys_reg(vcpu, SCTLR_EL2); > - __vcpu_write_sys_reg(vcpu, *vcpu_pc(vcpu), ELR_EL2); > + vbar = kvm_vcpu_read_sys_reg(vcpu, VBAR_EL2); > + sctlr = kvm_vcpu_read_sys_reg(vcpu, SCTLR_EL2); > + kvm_vcpu_write_sys_reg(vcpu, *vcpu_pc(vcpu), ELR_EL2); > break; > default: > /* Don't do that */ > @@ -185,7 +169,7 @@ static void enter_exception64(struct kvm_vcpu *vcpu, unsigned long target_mode, > */ > static unsigned long get_except32_cpsr(struct kvm_vcpu *vcpu, u32 mode) > { > - u32 sctlr = __vcpu_read_sys_reg(vcpu, SCTLR_EL1); > + u32 sctlr = kvm_vcpu_read_sys_reg(vcpu, SCTLR_EL1); > unsigned long old, new; > > old = *vcpu_cpsr(vcpu); > @@ -281,7 +265,7 @@ static void enter_exception32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset) > { > unsigned long spsr = *vcpu_cpsr(vcpu); > bool is_thumb = (spsr & PSR_AA32_T_BIT); > - u32 sctlr = __vcpu_read_sys_reg(vcpu, SCTLR_EL1); > + u32 sctlr = kvm_vcpu_read_sys_reg(vcpu, SCTLR_EL1); > u32 return_address; > > *vcpu_cpsr(vcpu) = get_except32_cpsr(vcpu, mode); > @@ -305,7 +289,7 @@ static void enter_exception32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset) > if (sctlr & (1 << 13)) > vect_offset += 0xffff0000; > else /* always have security exceptions */ > - vect_offset += __vcpu_read_sys_reg(vcpu, VBAR_EL1); > + vect_offset += kvm_vcpu_read_sys_reg(vcpu, VBAR_EL1); > > *vcpu_pc(vcpu) = vect_offset; > } > -- > 2.55.0.rc0.738.g0c8ab3ebcc-goog >