[PATCH OLK-6.6 0/8] arm:kvm feat feature
From: Xia Qinxin <xiaqinxin@opencode.com> driver inclusion category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 ---------------------------------------------------------------------- backport kvm arm_feat patches from linux mainline Marc Zyngier (6): KVM: arm64: Move FPMR into the sysreg array KVM: arm64: Add predicate for FPMR support in a VM KVM: arm64: Add save/restore support for FPMR KVM: arm64: Expose ID_AA64FPFR0_EL1 as a writable ID reg KVM: arm64: Enable FP8 support when available and configured KVM: arm64: Expose ID_AA64PFR2_EL1 to userspace and guests Mark Brown (1): KVM: arm64: Allow control of dpISA extensions in ID_AA64ISAR3_EL1 Qinxin Xia (1): KVM: arm64: Fix kabi break by fpmr arch/arm64/include/asm/kvm_host.h | 15 +++++++++++++ arch/arm64/kvm/Kconfig | 5 +++++ arch/arm64/kvm/fpsimd.c | 3 +++ arch/arm64/kvm/hyp/include/hyp/switch.h | 17 ++++++++++++-- arch/arm64/kvm/sys_regs.c | 30 +++++++++++++++++++++---- 5 files changed, 64 insertions(+), 6 deletions(-) -- 2.25.1
From: Marc Zyngier <maz@kernel.org> mainline inclusion from mainline-6.12 commit 7d9c1ed6f4bfa8d5fcafad847ac64e2839a04301 category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- Just like SVCR, FPMR is currently stored at the wrong location. Let's move it where it belongs. Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20240820131802.3547589-4-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org> Conflicts: arch/arm64/include/asm/kvm_host.h [Context conflicts] Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Signed-off-by: Hongye Lin <linhongye@h-partners.com> --- arch/arm64/include/asm/kvm_host.h | 2 ++ arch/arm64/kvm/sys_regs.c | 11 +++++++++++ 2 files changed, 13 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index bdd2168b6d6a..d5d867d21658 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -418,6 +418,8 @@ enum vcpu_sysreg { PIR_EL1, /* Permission Indirection Register 1 (EL1) */ PIRE0_EL1, /* Permission Indirection Register 0 (EL1) */ + FPMR, + /* 32bit specific registers. */ DACR32_EL2, /* Domain Access Control Register */ IFSR32_EL2, /* Instruction Fault Status Register */ diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index c94b24311525..3216c1124ebb 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1566,6 +1566,15 @@ static unsigned int sve_visibility(const struct kvm_vcpu *vcpu, return REG_HIDDEN; } +static unsigned int fp8_visibility(const struct kvm_vcpu *vcpu, + const struct sys_reg_desc *rd) +{ + if (kvm_has_fpmr(vcpu->kvm)) + return 0; + + return REG_HIDDEN; +} + static u64 read_sanitised_id_aa64pfr0_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd) { @@ -2659,6 +2668,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { CTR_EL0_L1Ip_MASK | CTR_EL0_IminLine_MASK), { SYS_DESC(SYS_SVCR), undef_access }, + { SYS_DESC(SYS_FPMR), undef_access, reset_val, FPMR, 0, + .visibility = fp8_visibility }, { PMU_SYS_REG(PMCR_EL0), .access = access_pmcr, .reset = reset_pmcr, .reg = PMCR_EL0, .get_user = get_pmcr, .set_user = set_pmcr }, -- 2.25.1
driver inclusion category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 ---------------------------------------------------------------------- For keep kabi of vcpu_sysreg, add CONFIG_ENABLE_KVM_FPMR to isolate this member. Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Signed-off-by: Hongye Lin <linhongye@h-partners.com> --- arch/arm64/include/asm/kvm_host.h | 2 ++ arch/arm64/kvm/Kconfig | 5 +++++ arch/arm64/kvm/sys_regs.c | 5 +++++ 3 files changed, 12 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index d5d867d21658..e4b3fd9bc8ef 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -418,7 +418,9 @@ enum vcpu_sysreg { PIR_EL1, /* Permission Indirection Register 1 (EL1) */ PIRE0_EL1, /* Permission Indirection Register 0 (EL1) */ +#ifdef CONFIG_ENABLE_KVM_FPMR FPMR, +#endif /* 32bit specific registers. */ DACR32_EL2, /* Domain Access Control Register */ diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index dbb1a70fbad7..b5d8cb344f4d 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -105,6 +105,11 @@ config KVM_ARM_MULTI_LPI_TRANSLATE_CACHE depends on ARM_GIC_V3_ITS default n +config ENABLE_KVM_FPMR + bool "Enable FEAT_FPMR in KVM" + depends on KVM + default n + config ARCH_VCPU_STAT bool "export kvm exits to vcpu_stat" depends on KVM diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 3216c1124ebb..8abcc9d9b9fc 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1566,6 +1566,7 @@ static unsigned int sve_visibility(const struct kvm_vcpu *vcpu, return REG_HIDDEN; } +#ifdef CONFIG_ENABLE_KVM_FPMR static unsigned int fp8_visibility(const struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd) { @@ -1574,6 +1575,7 @@ static unsigned int fp8_visibility(const struct kvm_vcpu *vcpu, return REG_HIDDEN; } +#endif static u64 read_sanitised_id_aa64pfr0_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd) @@ -2668,8 +2670,11 @@ static const struct sys_reg_desc sys_reg_descs[] = { CTR_EL0_L1Ip_MASK | CTR_EL0_IminLine_MASK), { SYS_DESC(SYS_SVCR), undef_access }, + +#ifdef CONFIG_ENABLE_KVM_FPMR { SYS_DESC(SYS_FPMR), undef_access, reset_val, FPMR, 0, .visibility = fp8_visibility }, +#endif { PMU_SYS_REG(PMCR_EL0), .access = access_pmcr, .reset = reset_pmcr, .reg = PMCR_EL0, .get_user = get_pmcr, .set_user = set_pmcr }, -- 2.25.1
From: Marc Zyngier <maz@kernel.org> mainline inclusion from mainline-6.12 commit d4db98791aa5316677a1da9bfa0788068c9863dc category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- As we are about to check for the advertisement of FPMR support to a guest in a number of places, add a predicate that will gate most of the support code for FPMR. Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20240820131802.3547589-3-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org> Conflicts: arch/arm64/include/asm/kvm_host.h [Modifications adapt to kaki breakage.] Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Signed-off-by: Hongye Lin <linhongye@h-partners.com> --- arch/arm64/include/asm/kvm_host.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index e4b3fd9bc8ef..da553b005182 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1449,4 +1449,11 @@ extern bool kvm_ncsnp_support; extern bool kvm_dvmbm_support; extern bool enable_vmovp_elision; +#ifdef CONFIG_ENABLE_KVM_FPMR +#define kvm_has_fpmr(k) \ + (system_supports_fpmr() && \ + (FIELD_GET(ID_AA64PFR2_EL1_FPMR_MASK, \ + kvm_read_vm_id_reg((k), SYS_ID_AA64PFR2_EL1)) >= \ + ID_AA64PFR2_EL1_FPMR_IMP)) +#endif #endif /* __ARM64_KVM_HOST_H__ */ -- 2.25.1
From: Marc Zyngier <maz@kernel.org> mainline inclusion from mainline-6.12 commit ef3be86021c3bdf384c36d9d4aa1ee9fe65b95af category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- Just like the rest of the FP/SIMD state, FPMR needs to be context switched. The only interesting thing here is that we need to treat the pKVM part a bit differently, as the host FP state is never written back to the vcpu thread, but instead stored locally and eagerly restored. Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20240820131802.3547589-5-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org> Conflicts: arch/arm64/include/asm/kvm_host.h arch/arm64/kvm/fpsimd.c arch/arm64/kvm/hyp/include/hyp/switch.h [Modifications adapt to kaki breakage.] Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Signed-off-by: Hongye Lin <linhongye@h-partners.com> --- arch/arm64/include/asm/kvm_host.h | 4 ++++ arch/arm64/kvm/fpsimd.c | 3 +++ arch/arm64/kvm/hyp/include/hyp/switch.h | 12 +++++++++++- 3 files changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index da553b005182..07e8144d55f7 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -502,6 +502,10 @@ struct kvm_host_data { struct kvm_cpu_context host_ctxt; struct user_fpsimd_state *fpsimd_state; /* hyp VA */ +#ifdef CONFIG_ENABLE_KVM_FPMR + u64 fpmr; +#endif + /* Ownership of the FP regs */ enum { FP_STATE_FREE, diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c index 9c444a277a17..90fb893e47ba 100644 --- a/arch/arm64/kvm/fpsimd.c +++ b/arch/arm64/kvm/fpsimd.c @@ -137,6 +137,9 @@ void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) fp_state.sve_vl = vcpu->arch.sve_max_vl; fp_state.sme_state = NULL; fp_state.svcr = &vcpu->arch.svcr; +#ifdef CONFIG_ENABLE_KVM_FPMR + fp_state.fpmr = &__vcpu_sys_reg(vcpu, FPMR); +#endif fp_state.fp_type = &vcpu->arch.fp_type; if (vcpu_has_sve(vcpu)) diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index a28d79608d06..0a1e613fcab6 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -369,8 +369,13 @@ static inline bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code) isb(); /* Write out the host state if it's in the registers */ - if (*host_data_ptr(fp_owner) == FP_STATE_HOST_OWNED) + if (*host_data_ptr(fp_owner) == FP_STATE_HOST_OWNED) { __fpsimd_save_state(*host_data_ptr(fpsimd_state)); +#ifdef CONFIG_ENABLE_KVM_FPMR + if (system_supports_fpmr()) + *host_data_ptr(fpmr) = read_sysreg_s(SYS_FPMR); +#endif + } /* Restore the guest state */ if (sve_guest) @@ -378,6 +383,11 @@ static inline bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code) else __fpsimd_restore_state(&vcpu->arch.ctxt.fp_regs); +#ifdef CONFIG_ENABLE_KVM_FPMR + if (kvm_has_fpmr(kern_hyp_va(vcpu->kvm))) + write_sysreg_s(__vcpu_sys_reg(vcpu, FPMR), SYS_FPMR); +#endif + /* Skip restoring fpexc32 for AArch64 guests */ if (!(read_sysreg(hcr_el2) & HCR_RW)) write_sysreg(__vcpu_sys_reg(vcpu, FPEXC32_EL2), fpexc32_el2); -- 2.25.1
From: Marc Zyngier <maz@kernel.org> mainline inclusion from mainline-6.12 commit 6d7307651a8a021e7286e90264676b893cb6032d category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- ID_AA64FPFR0_EL1 contains all sort of bits that contain a description of which FP8 subfeatures are implemented. We don't really care about them, so let's just expose that register and allow userspace to disable subfeatures at will. Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20240820131802.3547589-7-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Signed-off-by: Hongye Lin <linhongye@h-partners.com> --- arch/arm64/kvm/sys_regs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 8abcc9d9b9fc..bbdd6a2f42c2 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -2479,7 +2479,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0), ID_HIDDEN(ID_AA64SMFR0_EL1), ID_UNALLOCATED(4,6), - ID_UNALLOCATED(4,7), + ID_WRITABLE(ID_AA64FPFR0_EL1, ~ID_AA64FPFR0_EL1_RES0), /* CRm=5 */ { SYS_DESC(SYS_ID_AA64DFR0_EL1), -- 2.25.1
From: Marc Zyngier <maz@kernel.org> mainline inclusion from mainline-6.12 commit c9150a8ad9cdb69584d4ec5af61481df41498eb8 category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- If userspace has enabled FP8 support (by setting ID_AA64PFR2_EL1.FPMR to 1), let's enable the feature by setting HCRX_EL2.EnFPM for the vcpu. Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20240820131802.3547589-8-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org> Conflicts: arch/arm64/kvm/hyp/include/hyp/switch.h [Modifications adapt to kaki breakage.] Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Signed-off-by: Hongye Lin <linhongye@h-partners.com> --- arch/arm64/kvm/hyp/include/hyp/switch.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index 0a1e613fcab6..6e3c26416658 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -246,7 +246,10 @@ static inline void __activate_traps_common(struct kvm_vcpu *vcpu) if (cpus_have_final_cap(ARM64_HAS_LS64_V)) hcrx |= HCRX_EL2_EnASR; - +#ifdef CONFIG_ENABLE_KVM_FPMR + if (kvm_has_fpmr(kern_hyp_va(vcpu->kvm))) + hcrx |= HCRX_EL2_EnFPM; +#endif ctxt_sys_reg(hctxt, HCRX_EL2) = read_sysreg_s(SYS_HCRX_EL2); write_sysreg_s(hcrx, SYS_HCRX_EL2); } -- 2.25.1
From: Marc Zyngier <maz@kernel.org> mainline inclusion from mainline-6.12 commit 13c7a51eeb747ec315485ac7b13d4ea03707f53e category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- Everything is now in place for a guest to "enjoy" FP8 support. Expose ID_AA64PFR2_EL1 to both userspace and guests, with the explicit restriction of only being able to clear FPMR. All other features (MTE* at the time of writing) are hidden and not writable. Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20240820131802.3547589-9-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org> Conflicts: arch/arm64/kvm/sys_regs.c [Context conflicts] Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Signed-off-by: Hongye Lin <linhongye@h-partners.com> --- arch/arm64/kvm/sys_regs.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index bbdd6a2f42c2..f71c99ccceab 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1445,8 +1445,10 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, case SYS_ID_MMFR4_EL1: val &= ~ARM64_FEATURE_MASK(ID_MMFR4_EL1_CCIDX); break; + case SYS_ID_AA64PFR2_EL1: + val &= ID_AA64PFR2_EL1_FPMR_MASK; + break; } - return val; } @@ -2474,7 +2476,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { .set_user = set_id_aa64pfr1_el1, .reset = kvm_read_sanitised_id_reg, .val = ID_AA64PFR1_EL1_NMI}, - ID_UNALLOCATED(4,2), + ID_WRITABLE(ID_AA64PFR2_EL1, ID_AA64PFR2_EL1_FPMR), ID_UNALLOCATED(4,3), ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0), ID_HIDDEN(ID_AA64SMFR0_EL1), -- 2.25.1
From: Mark Brown <broonie@kernel.org> mainline inclusion from mainline-6.12 commit fd22af17a458d98c14cebd00091cebf69b954b40 category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8904 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- ID_AA64ISAR3_EL1 is currently marked as unallocated in KVM but does have a number of bitfields defined in it. Expose FPRCVT and FAMINMAX, two simple instruction only extensions to guests. Reviewed-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20250107-arm64-2024-dpisa-v5-4-7578da51fc3d@kernel... Signed-off-by: Will Deacon <will@kernel.org> Conflicts: arch/arm64/kvm/sys_regs.c [Context conflicts] Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Signed-off-by: Hongye Lin <linhongye@h-partners.com> --- arch/arm64/kvm/sys_regs.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index f71c99ccceab..fc2a1bc3c314 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1435,6 +1435,9 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT); val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_MOPS); break; + case SYS_ID_AA64ISAR3_EL1: + val &= ID_AA64ISAR3_EL1_FAMINMAX | ID_AA64ISAR3_EL1_LSUI; + break; case SYS_ID_AA64MMFR2_EL1: val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK; break; @@ -2523,7 +2526,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_AA64ISAR2_EL1_MOPS | ID_AA64ISAR2_EL1_APA3 | ID_AA64ISAR2_EL1_GPA3)), - ID_UNALLOCATED(6,3), + ID_WRITABLE(ID_AA64ISAR3_EL1, (ID_AA64ISAR3_EL1_FAMINMAX | + ID_AA64ISAR3_EL1_LSUI)), ID_UNALLOCATED(6,4), ID_UNALLOCATED(6,5), ID_UNALLOCATED(6,6), -- 2.25.1
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