- 21 Feb, 2020 2 commits
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wanpeng li authored
For the duration of mapping eVMCS, it derefences ->memslots without holding ->srcu or ->slots_lock when accessing hv assist page. This patch fixes it by moving nested_sync_vmcs12_to_shadow to prepare_guest_switch, where the SRCU is already taken. It can be reproduced by running kvm's evmcs_test selftest. ============================= warning: suspicious rcu usage 5.6.0-rc1+ #53 tainted: g w ioe ----------------------------- ./include/linux/kvm_host.h:623 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by evmcs_test/8507: #0: ffff9ddd156d00d0 (&vcpu->mutex){+.+.}, at: kvm_vcpu_ioctl+0x85/0x680 [kvm] stack backtrace: cpu: 6 pid: 8507 comm: evmcs_test tainted: g w ioe 5.6.0-rc1+ #53 hardware name: dell inc. optiplex 7040/0jctf8, bios 1.4.9 09/12/2016 call trace: dump_stack+0x68/0x9b kvm_read_guest_cached+0x11d/0x150 [kvm] kvm_hv_get_assist_page+0x33/0x40 [kvm] nested_enlightened_vmentry+0x2c/0x60 [kvm_intel] nested_vmx_handle_enlightened_vmptrld.part.52+0x32/0x1c0 [kvm_intel] nested_sync_vmcs12_to_shadow+0x439/0x680 [kvm_intel] vmx_vcpu_run+0x67a/0xe60 [kvm_intel] vcpu_enter_guest+0x35e/0x1bc0 [kvm] kvm_arch_vcpu_ioctl_run+0x40b/0x670 [kvm] kvm_vcpu_ioctl+0x370/0x680 [kvm] ksys_ioctl+0x235/0x850 __x64_sys_ioctl+0x16/0x20 do_syscall_64+0x77/0x780 entry_syscall_64_after_hwframe+0x49/0xbe Signed-off-by:Wanpeng Li <wanpengli@tencent.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Miaohe Lin authored
Commit 13db7734 ("KVM: x86: don't notify userspace IOAPIC on edge EOI") said, edge-triggered interrupts don't set a bit in TMR, which means that IOAPIC isn't notified on EOI. And var level indicates level-triggered interrupt. But commit 3159d36a ("KVM: x86: use generic function for MSI parsing") replace var level with irq.level by mistake. Fix it by changing irq.level to irq.trig_mode. Cc: stable@vger.kernel.org Fixes: 3159d36a ("KVM: x86: use generic function for MSI parsing") Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Signed-off-by:
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- 20 Feb, 2020 2 commits
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Qian Cai authored
arch/x86/kvm/emulate.c: In function 'x86_emulate_insn': arch/x86/kvm/emulate.c:5686:22: error: cast between incompatible function types from 'int (*)(struct x86_emulate_ctxt *)' to 'void (*)(struct fastop *)' [-Werror=cast-function-type] rc = fastop(ctxt, (fastop_t)ctxt->execute); Fix it by using an unnamed union of a (*execute) function pointer and a (*fastop) function pointer. Fixes: 3009afc6 ("KVM: x86: Use a typedef for fastop functions") Suggested-by:Qian Cai <cai@lca.pw> Signed-off-by:
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Paolo Bonzini authored
The "u" field in the event has three states, -1/0/1. Using u8 however means that comparison with -1 will always fail, so change to signed char. Signed-off-by:
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- 17 Feb, 2020 2 commits
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Miaohe Lin authored
Fix wrong variable names and grammar error in comment. Signed-off-by:
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Paolo Bonzini authored
Reported with "make W=1" due to -Wmissing-prototypes. Reported-by:
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- 12 Feb, 2020 34 commits
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Paolo Bonzini authored
Avoid more embarrassing mistakes. At least those that the compiler can catch. Signed-off-by: -
Mauro Carvalho Chehab authored
Due to some merge conflict, this file ended being alone under Documentation/virtual. The file itself is almost at ReST format. Just minor adjustments are needed: - Adjust title markup; - Adjust a list identation; - add a literal block markup; - Add some blank lines. Signed-off-by:
Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by:
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Mauro Carvalho Chehab authored
This file is already in ReST compatible format. So, rename it and add to the kvm's index.rst. While here, use the standard conversion for document titles. Signed-off-by:
Cornelia Huck <cohuck@redhat.com> Signed-off-by:
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Mauro Carvalho Chehab authored
- Use document title and chapter markups; - Add markups for literal blocks; - Add markups for tables; - use :field: for field descriptions; - Add blank lines and adjust indentation. Signed-off-by:
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Mauro Carvalho Chehab authored
This file is almost in ReST format. Just one change was needed: - Add markups for a literal block and change its indentation. While here, use the standard markup for the document title. Signed-off-by: -
Mauro Carvalho Chehab authored
- Use document title and chapter markups; - Add markups for tables; - Use list markups; - Add markups for literal blocks; - Add blank lines. Signed-off-by:
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Mauro Carvalho Chehab authored
This file is almost in ReST format. Just a small set of changes were needed: - Add markups for lists; - Add markups for a literal block; - Adjust whitespaces. While here, use the standard markup for the document title. Signed-off-by: -
Mauro Carvalho Chehab authored
- Use document title and chapter markups; - Add markups for tables; - Add markups for literal blocks; - Add blank lines and adjust indentation. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use document title and chapter markups; - Add markups for literal blocks; - use :field: for field descriptions; - Add blank lines and adjust indentation. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use document title and chapter markups; - Convert tables; - Add markups for literal blocks; - use :field: for field descriptions; - Add blank lines and adjust indentation Signed-off-by:
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Mauro Carvalho Chehab authored
- Add a title for the document; - Adjust whitespaces for it to be properly formatted after parsed. Signed-off-by:
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Mauro Carvalho Chehab authored
- Add proper markups for titles; - Adjust whitespaces and blank lines to match ReST needs; - Mark literal blocks as such. Signed-off-by:
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Mauro Carvalho Chehab authored
convert api.txt document to ReST format while trying to keep its format as close as possible with the authors intent, and avoid adding uneeded markups. - Use document title and chapter markups; - Convert tables; - Add markups for literal blocks; - use :field: for field descriptions; - Add blank lines and adjust indentation Signed-off-by:
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Mauro Carvalho Chehab authored
- Use title markups; - adjust indentation and add blank lines as needed; - adjust tables to match ReST accepted formats; - mark code blocks as such. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use title markups; - adjust indentation and add blank lines as needed; - adjust tables to match ReST accepted formats; - use :field: markups. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use title markups; - adjust indentation and add blank lines as needed; - use :field: markups; - Use cross-references; - mark code blocks as such. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use standard title markup; - adjust lists; - mark code blocks as such. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use title markups; - adjust indentation and add blank lines as needed; - adjust tables to match ReST accepted formats; - use :field: markups; - mark code blocks as such. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use standard markup for document title; - Adjust indentation and add blank lines as needed; - use the notes markup; - mark code blocks as such. Signed-off-by:
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Mauro Carvalho Chehab authored
This document is almost in ReST format. The only thing needed is to mark a list as such and to add an extra whitespace. Yet, let's also use the standard document title markup, as it makes easier if anyone wants later to add sessions to it. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use title markups; - change indent to match ReST syntax; - use proper table markups; - use literal block markups. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use title markups; - change indent to match ReST syntax; - use proper table markups; - use literal block markups. Signed-off-by:
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Mauro Carvalho Chehab authored
- Fix document title to match ReST format - Convert the table to be properly recognized - use proper markups for literal blocks - Some indentation fixes to match ReST While here, add an index for kvm devices. Signed-off-by:
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Mauro Carvalho Chehab authored
- Use document title markup; - Convert tables; - Add blank lines and adjust indentation. Signed-off-by:
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Mauro Carvalho Chehab authored
- Fix document title to match ReST format - Convert the table to be properly recognized - Some indentation fixes to match ReST syntax. Signed-off-by:
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Mauro Carvalho Chehab authored
Several URLs are pointing to outdated places. Update the references for the URLs whose contents still exists, removing the others. Signed-off-by:
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Mauro Carvalho Chehab authored
Instead of pointing for a pre-2.4 and a seaparate patch, update it to match current upstream, as UML was merged a long time ago. Signed-off-by:
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Mauro Carvalho Chehab authored
Despite being an old document, it contains lots of information that could still be useful. The document has a nice style with makes easy to convert to ReST. So, let's convert it to ReST. This patch does: - Use proper markups for titles; - Mark and proper indent literal blocks; - don't use an 'o' character for lists; - other minor changes required for the doc to be parsed. Signed-off-by:
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Mauro Carvalho Chehab authored
Add this file to a new kvm/arm index.rst, in order for it to be shown as part of the virt book. Signed-off-by:
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Paolo Bonzini authored
The check cpu->hv_clock.system_time < 0 is redundant since system_time is a u64 and hence can never be less than zero. But what was actually meant is to check that the result is positive, since kernel_ns and v->kvm->arch.kvmclock_offset are both s64. Reported-by:
Colin King <colin.king@canonical.com> Suggested-by:
Sean Christopherson <sean.j.christopherson@intel.com> Addresses-Coverity: ("Macro compares unsigned to 0") Reviewed-by:
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Eric Auger authored
x86_register enum is not used, let's remove it. Signed-off-by:
Eric Auger <eric.auger@redhat.com> Suggested-by:
Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
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Sean Christopherson authored
Define PT_MAX_FULL_LEVELS as PT64_ROOT_MAX_LEVEL, i.e. 5, to fix shadow paging for 5-level guest page tables. PT_MAX_FULL_LEVELS is used to size the arrays that track guest pages table information, i.e. using a "max levels" of 4 causes KVM to access garbage beyond the end of an array when querying state for level 5 entries. E.g. FNAME(gpte_changed) will read garbage and most likely return %true for a level 5 entry, soft-hanging the guest because FNAME(fetch) will restart the guest instead of creating SPTEs because it thinks the guest PTE has changed. Note, KVM doesn't yet support 5-level nested EPT, so PT_MAX_FULL_LEVELS gets to stay "4" for the PTTYPE_EPT case. Fixes: 855feb67 ("KVM: MMU: Add 5 level EPT & Shadow page table support.") Cc: stable@vger.kernel.org Signed-off-by:
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Sean Christopherson authored
Hardcode the EPT page-walk level for L2 to be 4 levels, as KVM's MMU currently also hardcodes the page walk level for nested EPT to be 4 levels. The L2 guest is all but guaranteed to soft hang on its first instruction when L1 is using EPT, as KVM will construct 4-level page tables and then tell hardware to use 5-level page tables. Fixes: 855feb67 ("KVM: MMU: Add 5 level EPT & Shadow page table support.") Cc: stable@vger.kernel.org Signed-off-by:
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Miaohe Lin authored
Fix some typos in the comments. Also fix coding style. [Sean Christopherson rewrites the comment of write_fault_to_shadow_pgtable field in struct kvm_vcpu_arch.] Signed-off-by:
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