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Peter Anvin" Subject: [RFC PATCH 48/73] KVM: x86/PVM: Implement system registers setting callbacks Date: Mon, 26 Feb 2024 22:36:05 +0800 Message-Id: <20240226143630.33643-49-jiangshanlai@gmail.com> X-Mailer: git-send-email 2.19.1.6.gb485710b In-Reply-To: <20240226143630.33643-1-jiangshanlai@gmail.com> References: <20240226143630.33643-1-jiangshanlai@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Lai Jiangshan In PVM, the hardware CR0, CR3, and EFER are fixed, and the value of the guest must match the fixed value; otherwise, the guest is not allowed to run on the CPU. Signed-off-by: Lai Jiangshan Signed-off-by: Hou Wenlong --- arch/x86/kvm/pvm/pvm.c | 51 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/arch/x86/kvm/pvm/pvm.c b/arch/x86/kvm/pvm/pvm.c index a32d2728eb02..b261309fc946 100644 --- a/arch/x86/kvm/pvm/pvm.c +++ b/arch/x86/kvm/pvm/pvm.c @@ -1088,6 +1088,51 @@ static int pvm_set_msr(struct kvm_vcpu *vcpu, struct= msr_data *msr_info) return ret; } =20 +static void pvm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) +{ + /* Nothing to do */ +} + +static int pvm_set_efer(struct kvm_vcpu *vcpu, u64 efer) +{ + vcpu->arch.efer =3D efer; + + return 0; +} + +static bool pvm_is_valid_cr0(struct kvm_vcpu *vcpu, unsigned long cr4) +{ + return true; +} + +static void pvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) +{ + if (vcpu->arch.efer & EFER_LME) { + if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) + vcpu->arch.efer |=3D EFER_LMA; + + if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) + vcpu->arch.efer &=3D ~EFER_LMA; + } + + vcpu->arch.cr0 =3D cr0; +} + +static bool pvm_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) +{ + return true; +} + +static void pvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) +{ + unsigned long old_cr4 =3D vcpu->arch.cr4; + + vcpu->arch.cr4 =3D cr4; + + if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE)) + kvm_update_cpuid_runtime(vcpu); +} + static void pvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { @@ -2912,13 +2957,19 @@ static struct kvm_x86_ops pvm_x86_ops __initdata = =3D { .set_segment =3D pvm_set_segment, .get_cpl =3D pvm_get_cpl, .get_cs_db_l_bits =3D pvm_get_cs_db_l_bits, + .is_valid_cr0 =3D pvm_is_valid_cr0, + .set_cr0 =3D pvm_set_cr0, .load_mmu_pgd =3D pvm_load_mmu_pgd, + .is_valid_cr4 =3D pvm_is_valid_cr4, + .set_cr4 =3D pvm_set_cr4, + .set_efer =3D pvm_set_efer, .get_gdt =3D pvm_get_gdt, .set_gdt =3D pvm_set_gdt, .get_idt =3D pvm_get_idt, .set_idt =3D pvm_set_idt, .set_dr7 =3D pvm_set_dr7, .sync_dirty_debug_regs =3D pvm_sync_dirty_debug_regs, + .cache_reg =3D pvm_cache_reg, .get_rflags =3D pvm_get_rflags, .set_rflags =3D pvm_set_rflags, .get_if_flag =3D pvm_get_if_flag, --=20 2.19.1.6.gb485710b