Date: Tue, 7 Oct 2025 08:41:57 GMT From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 534aec00976c - main - arm64/vmm: Handle debug exits Message-ID: <202510070841.5978fvwv006183@gitrepo.freebsd.org>
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The branch main has been updated by andrew: URL: https://cgit.FreeBSD.org/src/commit/?id=534aec00976c18c4c4b485b2fade9d5f33de89c8 commit 534aec00976c18c4c4b485b2fade9d5f33de89c8 Author: Andrew Turner <andrew@FreeBSD.org> AuthorDate: 2025-10-07 08:26:00 +0000 Commit: Andrew Turner <andrew@FreeBSD.org> CommitDate: 2025-10-07 08:27:15 +0000 arm64/vmm: Handle debug exits This is enough to boot FreeBSD again. PR: 290044 Reported by: Siva Mahadevan <me@svmhdvn.name> Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D52931 --- sys/arm64/vmm/arm64.h | 1 + sys/arm64/vmm/vmm.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/sys/arm64/vmm/arm64.h b/sys/arm64/vmm/arm64.h index 334b795832a3..f9b74aef7188 100644 --- a/sys/arm64/vmm/arm64.h +++ b/sys/arm64/vmm/arm64.h @@ -119,6 +119,7 @@ struct hypctx { struct vgic_v3_regs vgic_v3_regs; struct vgic_v3_cpu *vgic_cpu; bool has_exception; + bool dbg_oslock; }; struct hyp { diff --git a/sys/arm64/vmm/vmm.c b/sys/arm64/vmm/vmm.c index 1dcefa1489e9..a551a2807183 100644 --- a/sys/arm64/vmm/vmm.c +++ b/sys/arm64/vmm/vmm.c @@ -651,6 +651,33 @@ vmm_reg_wi(struct vcpu *vcpu, uint64_t wval, void *arg) return (0); } +static int +vmm_write_oslar_el1(struct vcpu *vcpu, uint64_t wval, void *arg) +{ + struct hypctx *hypctx; + + hypctx = vcpu_get_cookie(vcpu); + /* All other fields are RES0 & we don't do anything with this */ + /* TODO: Disable access to other debug state when locked */ + hypctx->dbg_oslock = (wval & OSLAR_OSLK) == OSLAR_OSLK; + return (0); +} + +static int +vmm_read_oslsr_el1(struct vcpu *vcpu, uint64_t *rval, void *arg) +{ + struct hypctx *hypctx; + uint64_t val; + + hypctx = vcpu_get_cookie(vcpu); + val = OSLSR_OSLM_1; + if (hypctx->dbg_oslock) + val |= OSLSR_OSLK; + *rval = val; + + return (0); +} + static const struct vmm_special_reg vmm_special_regs[] = { #define SPECIAL_REG(_reg, _read, _write) \ { \ @@ -707,6 +734,13 @@ static const struct vmm_special_reg vmm_special_regs[] = { SPECIAL_REG(CNTP_TVAL_EL0, vtimer_phys_tval_read, vtimer_phys_tval_write), SPECIAL_REG(CNTPCT_EL0, vtimer_phys_cnt_read, vtimer_phys_cnt_write), + + /* Debug registers */ + SPECIAL_REG(DBGPRCR_EL1, vmm_reg_raz, vmm_reg_wi), + SPECIAL_REG(OSDLR_EL1, vmm_reg_raz, vmm_reg_wi), + /* TODO: Exceptions on invalid access */ + SPECIAL_REG(OSLAR_EL1, vmm_reg_raz, vmm_write_oslar_el1), + SPECIAL_REG(OSLSR_EL1, vmm_read_oslsr_el1, vmm_reg_wi), #undef SPECIAL_REG };
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