From: Heyi Guo guoheyi@huawei.com
virt inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8UJ9Q CVE: NA Reference: https://lore.kernel.org/kvmarm/20190724090437.49952-2-xiexiangyou@huawei.com... from OLK-5.10 commit aa4f446a8a97
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Pending LPIs may block new allocated LPIs in kdump secondary kernel. We only do that for guest kernel access to limit the change impact.
Signed-off-by: Heyi Guo guoheyi@huawei.com Signed-off-by: Zenghui Yu yuzenghui@huawei.com Reviewed-by: Hailiang Zhang zhang.zhanghailiang@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com Link: https://gitee.com/openeuler/kernel/commit/5b574685b743 Reviewed-by: Yanan Wang wangyanan55@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Signed-off-by: Jia Qingtong jiaqingtong@huawei.com --- arch/arm64/kvm/vgic/vgic-its.c | 41 +++++++++++++++++++++++++++++----- 1 file changed, 35 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c index ff91e208c752..3a0dd5825364 100644 --- a/arch/arm64/kvm/vgic/vgic-its.c +++ b/arch/arm64/kvm/vgic/vgic-its.c @@ -1726,10 +1726,10 @@ static unsigned long vgic_mmio_read_its_baser(struct kvm *kvm, }
#define GITS_BASER_RO_MASK (GENMASK_ULL(52, 48) | GENMASK_ULL(58, 56)) -static void vgic_mmio_write_its_baser(struct kvm *kvm, - struct vgic_its *its, - gpa_t addr, unsigned int len, - unsigned long val) +static void vgic_mmio_write_its_baser_common(struct kvm *kvm, + struct vgic_its *its, + gpa_t addr, unsigned int len, + unsigned long val, bool uaccess) { const struct vgic_its_abi *abi = vgic_its_get_abi(its); u64 entry_size, table_type; @@ -1766,10 +1766,21 @@ static void vgic_mmio_write_its_baser(struct kvm *kvm, *regptr = reg;
if (!(reg & GITS_BASER_VALID)) { + struct kvm_vcpu *vcpu; + unsigned long c; + /* Take the its_lock to prevent a race with a save/restore */ mutex_lock(&its->its_lock); switch (table_type) { case GITS_BASER_TYPE_DEVICE: + if (!uaccess) { + /* Fix kdump irq missing issue */ + pr_debug("%s: flush pending LPIs for all VCPUs.\n", + __func__); + kvm_for_each_vcpu(c, vcpu, kvm) + vgic_flush_pending_lpis(vcpu); + } + vgic_its_free_device_list(kvm, its); break; case GITS_BASER_TYPE_COLLECTION: @@ -1780,6 +1791,23 @@ static void vgic_mmio_write_its_baser(struct kvm *kvm, } }
+static void vgic_mmio_write_its_baser(struct kvm *kvm, + struct vgic_its *its, + gpa_t addr, unsigned int len, + unsigned long val) +{ + vgic_mmio_write_its_baser_common(kvm, its, addr, len, val, false); +} + +static int vgic_mmio_uaccess_write_its_baser(struct kvm *kvm, + struct vgic_its *its, + gpa_t addr, unsigned int len, + unsigned long val) +{ + vgic_mmio_write_its_baser_common(kvm, its, addr, len, val, true); + return 0; +} + static unsigned long vgic_mmio_read_its_ctlr(struct kvm *vcpu, struct vgic_its *its, gpa_t addr, unsigned int len) @@ -1872,8 +1900,9 @@ static struct vgic_register_region its_registers[] = { vgic_mmio_read_its_creadr, its_mmio_write_wi, vgic_mmio_uaccess_write_its_creadr, 8, VGIC_ACCESS_64bit | VGIC_ACCESS_32bit), - REGISTER_ITS_DESC(GITS_BASER, - vgic_mmio_read_its_baser, vgic_mmio_write_its_baser, 0x40, + REGISTER_ITS_DESC_UACCESS(GITS_BASER, + vgic_mmio_read_its_baser, vgic_mmio_write_its_baser, + vgic_mmio_uaccess_write_its_baser, 0x40, VGIC_ACCESS_64bit | VGIC_ACCESS_32bit), REGISTER_ITS_DESC(GITS_IDREGS_BASE, vgic_mmio_read_its_idregs, its_mmio_write_wi, 0x30,