| Message ID | 20231031131909.99632-1-tim.gardner@canonical.com |
|---|---|
| Headers | show |
| Series | Azure: Update TDX with HCL support | expand |
On Tue, 2023-10-31 at 07:19 -0600, Tim Gardner wrote: > BugLink: https://bugs.launchpad.net/bugs/2042096 > > SRU Justification > > [Impact] > > Microsoft has asked for the addition of 2 patches for TDX and SNP-SEV > VM support with HCL. > > The refreshed patches will fix 2 bugs for future Hyper-V versions: > 1) PCI DDA for Linux TDX VMs with HCL is not working due to a guest > bug and a host bug. > The guest bug is fixed in the mainline version of the TDX patches. > 2) On a recent Hyper-V dev build that advertises the Hyper-V TLB > flushing hypercalls, > the current Ubuntu 6.2 kernel passes a shared input page to the > Hyper-V while it should > pass a private input page; as a result, the hypercall always fails > and Linux now falls > back to the legacy native method of flusing TLB. This slows down the > flush-TLB > operation . The mainline version doesn't have the bug. > > [Test Plan] > > Microsoft tested. > > [Regression Potential] > > Azure instances with TDX on HCL hypervisors may not work correctly. Acked-by: Cengiz Can <cengiz.can@canonical.com> > > [Other Info] > > SF: #00364214 > >
On Tue, 2023-10-31 at 07:19 -0600, Tim Gardner wrote: > BugLink: https://bugs.launchpad.net/bugs/2042096 > > SRU Justification > > [Impact] > > Microsoft has asked for the addition of 2 patches for TDX and SNP-SEV > VM support with HCL. > > The refreshed patches will fix 2 bugs for future Hyper-V versions: > 1) PCI DDA for Linux TDX VMs with HCL is not working due to a guest > bug and a host bug. > The guest bug is fixed in the mainline version of the TDX patches. > 2) On a recent Hyper-V dev build that advertises the Hyper-V TLB > flushing hypercalls, > the current Ubuntu 6.2 kernel passes a shared input page to the > Hyper-V while it should > pass a private input page; as a result, the hypercall always fails > and Linux now falls > back to the legacy native method of flusing TLB. This slows down the > flush-TLB > operation . The mainline version doesn't have the bug. > > [Test Plan] > > Microsoft tested. > > [Regression Potential] > > Azure instances with TDX on HCL hypervisors may not work correctly. > > [Other Info] > > SF: #00364214 > >
On 10/31/23 7:19 AM, Tim Gardner wrote: > BugLink: https://bugs.launchpad.net/bugs/2042096 > > SRU Justification > > [Impact] > > Microsoft has asked for the addition of 2 patches for TDX and SNP-SEV VM support with HCL. > > The refreshed patches will fix 2 bugs for future Hyper-V versions: > 1) PCI DDA for Linux TDX VMs with HCL is not working due to a guest bug and a host bug. > The guest bug is fixed in the mainline version of the TDX patches. > 2) On a recent Hyper-V dev build that advertises the Hyper-V TLB flushing hypercalls, > the current Ubuntu 6.2 kernel passes a shared input page to the Hyper-V while it should > pass a private input page; as a result, the hypercall always fails and Linux now falls > back to the legacy native method of flusing TLB. This slows down the flush-TLB > operation . The mainline version doesn't have the bug. > > [Test Plan] > > Microsoft tested. > > [Regression Potential] > > Azure instances with TDX on HCL hypervisors may not work correctly. > > [Other Info] > > SF: #00364214 > Applied to lunar/linux-azure:master-next. Thanks. -rtg