From a9ed3aa9b87ee41e8ab3ff471b1331c154767e45 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Sat, 26 Sep 2026 07:57:59 +1000 Subject: Merge tag 'drm-misc-fixes-2026-09-24' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-fixes A number of fixes: - bridge: - samsung-dsim: fix GPIO lifetime - client: Null pointer dereference fix - imagination: error handling fix, page handling fix - nouveau: fix reference leaks, double-frees, out-of-bounds accesses, use-after-frees, don't reject config without SCDC, a number of workarounds - virtio: fix memory leak, reference leaks, null pointer dereference, add pixel blend mode, cache coherency fix Signed-off-by: Dave Airlie From: Maxime Ripard Link: https://patch.msgid.link/arU22zzqUGDEco1y@houat --- arch/x86/hyperv/nested.c | 130 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 130 insertions(+) create mode 100644 arch/x86/hyperv/nested.c (limited to 'arch/x86/hyperv/nested.c') diff --git a/arch/x86/hyperv/nested.c b/arch/x86/hyperv/nested.c new file mode 100644 index 000000000..8ccbb7c4f --- /dev/null +++ b/arch/x86/hyperv/nested.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Hyper-V nested virtualization code. + * + * Copyright (C) 2018, Microsoft, Inc. + * + * Author : Lan Tianyu + */ +#define pr_fmt(fmt) "Hyper-V: " fmt + + +#include +#include +#include +#include +#include + +#include + +int hyperv_flush_guest_mapping(u64 as) +{ + struct hv_guest_mapping_flush *flush; + u64 status; + unsigned long flags; + int ret = -ENOTSUPP; + + if (!hv_hypercall_pg) + goto fault; + + local_irq_save(flags); + + flush = *this_cpu_ptr(hyperv_pcpu_input_arg); + + if (unlikely(!flush)) { + local_irq_restore(flags); + goto fault; + } + + flush->address_space = as; + flush->flags = 0; + + status = hv_do_hypercall(HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE, + flush, NULL); + local_irq_restore(flags); + + if (hv_result_success(status)) + ret = 0; + +fault: + trace_hyperv_nested_flush_guest_mapping(as, ret); + return ret; +} +EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping); + +int hyperv_fill_flush_guest_mapping_list( + struct hv_guest_mapping_flush_list *flush, + u64 start_gfn, u64 pages) +{ + u64 cur = start_gfn; + u64 additional_pages; + int gpa_n = 0; + + do { + /* + * If flush requests exceed max flush count, go back to + * flush tlbs without range. + */ + if (gpa_n >= HV_MAX_FLUSH_REP_COUNT) + return -ENOSPC; + + additional_pages = min_t(u64, pages, HV_MAX_FLUSH_PAGES) - 1; + + flush->gpa_list[gpa_n].page.additional_pages = additional_pages; + flush->gpa_list[gpa_n].page.largepage = false; + flush->gpa_list[gpa_n].page.basepfn = cur; + + pages -= additional_pages + 1; + cur += additional_pages + 1; + gpa_n++; + } while (pages > 0); + + return gpa_n; +} +EXPORT_SYMBOL_GPL(hyperv_fill_flush_guest_mapping_list); + +int hyperv_flush_guest_mapping_range(u64 as, + hyperv_fill_flush_list_func fill_flush_list_func, void *data) +{ + struct hv_guest_mapping_flush_list *flush; + u64 status; + unsigned long flags; + int ret = -ENOTSUPP; + int gpa_n = 0; + + if (!hv_hypercall_pg || !fill_flush_list_func) + goto fault; + + local_irq_save(flags); + + flush = *this_cpu_ptr(hyperv_pcpu_input_arg); + + if (unlikely(!flush)) { + local_irq_restore(flags); + goto fault; + } + + flush->address_space = as; + flush->flags = 0; + + gpa_n = fill_flush_list_func(flush, data); + if (gpa_n < 0) { + local_irq_restore(flags); + goto fault; + } + + status = hv_do_rep_hypercall(HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST, + gpa_n, 0, flush, NULL); + + local_irq_restore(flags); + + if (hv_result_success(status)) + ret = 0; + else + ret = hv_result(status); +fault: + trace_hyperv_nested_flush_guest_mapping_range(as, ret); + return ret; +} +EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping_range); -- cgit v1.3.1