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2021-04-30kvm: prefault a root table page before switching into a user address spaceAndrei Vagin
The root table physical page has to be mapped to not fault in iret or sysret after switching into a user address space. sysret and iret are in the upper half that is global and so page tables of lower levels are already mapped. Fixes #5742 PiperOrigin-RevId: 371458644
2021-04-21Merge pull request #5749 from zhlhahaha:2126gVisor bot
PiperOrigin-RevId: 369686298
2021-04-09Merge pull request #5767 from avagin:mxcsrgVisor bot
PiperOrigin-RevId: 367730917
2021-04-08Merge pull request #5736 from lubinszARM:pr_bblu_tlb_asidgVisor bot
PiperOrigin-RevId: 367523491
2021-04-01platform/kvm/x86: restore mxcsr when switching from guest to sentryAndrei Vagin
Goruntime sets mxcsr once and never changes it. Reported-by: syzbot+ec55cea6e57ec083b7a6@syzkaller.appspotmail.com Fixes: #5754
2021-03-30apply hostarch on pagetables_arm64_test.goHoward Zhang
Signed-off-by: Howard Zhang <howard.zhang@arm.com>
2021-03-29[syserror] Split usermem packageZach Koopmans
Split usermem package to help remove syserror dependency in go_marshal. New hostarch package contains code not dependent on syserror. PiperOrigin-RevId: 365651233
2021-03-26arm64 ring0: don't use inner-sharable to invalidate tlbRobin Luk
It is enough to invalidate the tlb of local vcpu in switch(). TLBI with inner-sharable will invalidate the tlb in other vcpu. Arm64 hardware supports at least 256 pcid, so I think it's ok to set the length of pcid pool to 128. Signed-off-by: Robin Luk <lubin.lu@antgroup.com>
2021-03-25Fix nogo test errorHoward Zhang
Signed-off-by: Howard Zhang <howard.zhang@arm.com>
2021-03-23Move the code that manages floating-point state to a separate packageAndrei Vagin
This change is inspired by Adin's cl/355256448. PiperOrigin-RevId: 364695931
2021-02-03arm64 kvm:implement basic lazy save and restore for FPSIMD registersRobin Luk
Implement basic lazy save and restore for FPSIMD registers, which only restore FPSIMD state on el0_fpsimd_acc and save FPSIMD state in switch(). Signed-off-by: Robin Luk <lubin.lu@antgroup.com>
2021-02-03arm64: clean codeRobin Luk
In order to improve the performance and stability, I reorg 2 modules slightly. arch: no red zone on Arm64. ring0: use stp instead of movd, and set RSV_REG_APP=R19. Signed-off-by: Robin Luk <lubin.lu@antgroup.com>
2021-02-02Move ring0 package.Adin Scannell
This allows the package to serve as a general purpose ring0 support package, as opposed to being bound to specific sentry platforms. Updates #5039 PiperOrigin-RevId: 355220044
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