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Wed, 22 Apr 2020 13:00:55 +0100 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH 01/26] KVM: arm64: Check advertised Stage-2 page size capability Date: Wed, 22 Apr 2020 13:00:25 +0100 Message-Id: <20200422120050.3693593-2-maz@kernel.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200422120050.3693593-1-maz@kernel.org> References: <20200422120050.3693593-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, andre.przywara@arm.com, christoffer.dall@arm.com, Dave.Martin@arm.com, jintack@cs.columbia.edu, alexandru.elisei@arm.com, gcherian@marvell.com, prime.zeng@hisilicon.com, will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200422_050057_632556_49E1A169 X-CRM114-Status: GOOD ( 17.57 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Will Deacon , Suzuki K Poulose , Andre Przywara , Christoffer Dall , Dave Martin , George Cherian , James Morse , "Zengtao \(B\)" , Catalin Marinas , Alexandru Elisei , Jintack Lim , Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org With ARMv8.5-GTG, the hardware (or more likely a hypervisor) can advertise the supported Stage-2 page sizes. Let's check this at boot time. Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/include/asm/sysreg.h | 3 +++ arch/arm64/kernel/cpufeature.c | 8 +++++++ arch/arm64/kvm/reset.c | 40 ++++++++++++++++++++++++++++--- virt/kvm/arm/arm.c | 4 +--- 5 files changed, 50 insertions(+), 7 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 32c8a675e5a4a..7dd8fefa6aecd 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -670,7 +670,7 @@ static inline int kvm_arm_have_ssbd(void) void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu); void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu); -void kvm_set_ipa_limit(void); +int kvm_set_ipa_limit(void); #define __KVM_HAVE_ARCH_VM_ALLOC struct kvm *kvm_arch_alloc_vm(void); diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index ebc6224328318..5d10c9148e844 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -686,6 +686,9 @@ #define ID_AA64ZFR0_SVEVER_SVE2 0x1 /* id_aa64mmfr0 */ +#define ID_AA64MMFR0_TGRAN4_2_SHIFT 40 +#define ID_AA64MMFR0_TGRAN64_2_SHIFT 36 +#define ID_AA64MMFR0_TGRAN16_2_SHIFT 32 #define ID_AA64MMFR0_TGRAN4_SHIFT 28 #define ID_AA64MMFR0_TGRAN64_SHIFT 24 #define ID_AA64MMFR0_TGRAN16_SHIFT 20 diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 9fac745aa7bb2..9892a845d06c9 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -208,6 +208,14 @@ static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = { }; static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { + /* + * Page size not being supported at Stage-2 are not fatal. You + * just give up KVM if PAGE_SIZE isn't supported there. Go fix + * your favourite nesting hypervisor. + */ + ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN4_2_SHIFT, 4, 1), + ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN64_2_SHIFT, 4, 1), + ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_EXACT, ID_AA64MMFR0_TGRAN16_2_SHIFT, 4, 1), /* * We already refuse to boot CPUs that don't support our configured * page size, so we can only detect mismatches for a page size other diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 30b7ea680f66c..241db35a7ef4f 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -9,6 +9,7 @@ */ #include +#include #include #include #include @@ -340,11 +341,42 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu) return ret; } -void kvm_set_ipa_limit(void) +int kvm_set_ipa_limit(void) { - unsigned int ipa_max, pa_max, va_max, parange; + unsigned int ipa_max, pa_max, va_max, parange, tgran_2; + u64 mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); - parange = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1) & 0x7; + /* + * Check with ARMv8.5-GTG that our PAGE_SIZE is supported at + * Stage-2. If not, things will stop very quickly. + */ + switch (PAGE_SIZE) { + default: + case SZ_4K: + tgran_2 = ID_AA64MMFR0_TGRAN4_2_SHIFT; + break; + case SZ_16K: + tgran_2 = ID_AA64MMFR0_TGRAN16_2_SHIFT; + break; + case SZ_64K: + tgran_2 = ID_AA64MMFR0_TGRAN64_2_SHIFT; + break; + } + + switch (FIELD_GET(0xFUL << tgran_2, mmfr0)) { + default: + case 1: + kvm_err("PAGE_SIZE not supported at Stage-2, giving up\n"); + return -EINVAL; + case 0: + kvm_debug("PAGE_SIZE supported at Stage-2 (default)\n"); + break; + case 2: + kvm_debug("PAGE_SIZE supported at Stage-2 (advertised)\n"); + break; + } + + parange = mmfr0 & 0x7; pa_max = id_aa64mmfr0_parange_to_phys_shift(parange); /* Clamp the IPA limit to the PA size supported by the kernel */ @@ -378,6 +410,8 @@ void kvm_set_ipa_limit(void) "KVM IPA limit (%d bit) is smaller than default size\n", ipa_max); kvm_ipa_limit = ipa_max; kvm_info("IPA Size Limit: %dbits\n", kvm_ipa_limit); + + return 0; } /* diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index 48d0ec44ad77e..53b3ba9173ba7 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -1387,9 +1387,7 @@ static inline void hyp_cpu_pm_exit(void) static int init_common_resources(void) { - kvm_set_ipa_limit(); - - return 0; + return kvm_set_ipa_limit(); } static int init_subsystems(void) -- 2.26.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel