similar to: [PATCH RFC v1 05/18] clocksource/hyperv: use MSR-based access if running as root

Wei Liu <wei.liu at kernel.org> writes: > On Tue, Sep 15, 2020 at 12:32:29PM +0200, Vitaly Kuznetsov wrote: >> Wei Liu <wei.liu at kernel.org> writes: >> >> > When Linux is running as the root partition, the hypercall page will >> > have already been setup by Hyper-V. Copy the content over to the >> > allocated page. >> >> And we

Wei Liu <wei.liu at kernel.org> writes: > On Tue, Sep 15, 2020 at 01:02:08PM +0200, Vitaly Kuznetsov wrote: >> Wei Liu <wei.liu at kernel.org> writes: >> >> > On Tue, Sep 15, 2020 at 12:32:29PM +0200, Vitaly Kuznetsov wrote: >> >> Wei Liu <wei.liu at kernel.org> writes: >> >> >> >> > When Linux is running as the

Wei Liu <wei.liu at kernel.org> writes: > When Linux is running as the root partition, the hypercall page will > have already been setup by Hyper-V. Copy the content over to the > allocated page. And we can't setup a new hypercall page by writing something different to HV_X64_MSR_HYPERCALL, right? > > The suspend, resume and cleanup paths remain untouched because they

Wei Liu <wei.liu at kernel.org> writes: > We will need the partition ID for executing some hypercalls later. > > Signed-off-by: Lillian Grassin-Drake <ligrassi at microsoft.com> > Co-Developed-by: Sunil Muthuswamy <sunilmut at microsoft.com> > Signed-off-by: Wei Liu <wei.liu at kernel.org> > --- > arch/x86/hyperv/hv_init.c | 26

Wei Liu <wei.liu at kernel.org> writes: > When Linux runs as the root partition, it will need to make hypercalls > which return data from the hypervisor. > > Allocate pages for storing results when Linux runs as the root > partition. > > Signed-off-by: Lillian Grassin-Drake <ligrassi at microsoft.com> > Co-Developed-by: Lillian Grassin-Drake <ligrassi at

Wei Liu <wei.liu at kernel.org> writes: > Microsoft Hypervisor requires the root partition to make a few > hypercalls to setup application processors before they can be used. > > Signed-off-by: Lillian Grassin-Drake <ligrassi at microsoft.com> > Signed-off-by: Sunil Muthuswamy <sunilmut at microsoft.com> > Co-Developed-by: Lillian Grassin-Drake <ligrassi at

Wei Liu <wei.liu at kernel.org> writes: > On Tue, Sep 15, 2020 at 12:43:18PM +0000, Wei Liu wrote: >> On Tue, Sep 15, 2020 at 12:16:58PM +0200, Vitaly Kuznetsov wrote: >> > Wei Liu <wei.liu at kernel.org> writes: >> > >> > > When Linux runs as the root partition, it will need to make hypercalls >> > > which return data from the

To use Hyper-V TSC page clocksource from vDSO we need to make tsc_pg available. Implement hv_get_tsc_page() and add CONFIG_HYPERV_TSCPAGE to make #ifdef-s simple. Signed-off-by: Vitaly Kuznetsov <vkuznets at redhat.com> --- arch/x86/hyperv/hv_init.c | 9 +++++++-- arch/x86/include/asm/mshyperv.h | 8 ++++++++ drivers/hv/Kconfig | 3 +++ 3 files changed, 18 insertions(+),

The actual code looks fine, but the style police will not like you. { should be at start of line on functions. And #else should be at start of line, But maybe this was just more of exchange mangling the mail. -----Original Message----- From: Vitaly Kuznetsov [mailto:vkuznets at redhat.com] Sent: Thursday, February 9, 2017 6:11 AM To: x86 at kernel.org; Andy Lutomirski <luto at

The actual code looks fine, but the style police will not like you. { should be at start of line on functions. And #else should be at start of line, But maybe this was just more of exchange mangling the mail. -----Original Message----- From: Vitaly Kuznetsov [mailto:vkuznets at redhat.com] Sent: Thursday, February 9, 2017 6:11 AM To: x86 at kernel.org; Andy Lutomirski <luto at

On Tue, Feb 14, 2017 at 7:50 AM, Vitaly Kuznetsov <vkuznets at redhat.com> wrote: > Thomas Gleixner <tglx at linutronix.de> writes: > >> On Tue, 14 Feb 2017, Vitaly Kuznetsov wrote: >> >>> Hi, >>> >>> while we're still waiting for a definitive ACK from Microsoft that the >>> algorithm is good for SMP case (as we can't

Thomas Gleixner <tglx at linutronix.de> writes: > On Tue, 14 Feb 2017, Vitaly Kuznetsov wrote: > >> Hi, >> >> while we're still waiting for a definitive ACK from Microsoft that the >> algorithm is good for SMP case (as we can't prevent the code in vdso from >> migrating between CPUs) I'd like to send v2 with some modifications to keep

Thomas Gleixner <tglx at linutronix.de> writes: > On Tue, 14 Feb 2017, Vitaly Kuznetsov wrote: > >> Hi, >> >> while we're still waiting for a definitive ACK from Microsoft that the >> algorithm is good for SMP case (as we can't prevent the code in vdso from >> migrating between CPUs) I'd like to send v2 with some modifications to keep

I am attaching a clocksource driver for HyperV. Signed-off-by: K. Y. Srinivasan <ksrinivasan at novell.com> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: hyperv_clocksource.patch Url: http://lists.linux-foundation.org/pipermail/virtualization/attachments/20100405/80968881/attachment-0001.txt

I am attaching a clocksource driver for HyperV. Signed-off-by: K. Y. Srinivasan <ksrinivasan at novell.com> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: hyperv_clocksource.patch Url: http://lists.linux-foundation.org/pipermail/virtualization/attachments/20100405/80968881/attachment-0001.txt

As a preparation to making Hyper-V TSC page suitable for vDSO move the TSC page reading logic to asm/mshyperv.h. While on it, do the following - Document the reading algorithm. - Simplify the code a bit. - Add explicit READ_ONCE() to not rely on 'volatile'. - Add explicit barriers to prevent re-ordering (we need to read sequence strictly before and after) - Use mul_u64_u64_shr() instead

From: Andrey Smetanin <asmetanin at virtuozzo.com> Hypervisor Top Level Functional Specification v3.1/4.0 notes that cpuid (0x40000003) EDX's 10th bit should be used to check that Hyper-V guest crash MSR's functionality available. This patch should fix this recognition. Currently the code checks EAX register instead of EDX. Signed-off-by: Andrey Smetanin <asmetanin at

From: Andrey Smetanin <asmetanin at virtuozzo.com> Hypervisor Top Level Functional Specification v3.1/4.0 notes that cpuid (0x40000003) EDX's 10th bit should be used to check that Hyper-V guest crash MSR's functionality available. This patch should fix this recognition. Currently the code checks EAX register instead of EDX. Signed-off-by: Andrey Smetanin <asmetanin at

Hi, while we're still waiting for a definitive ACK from Microsoft that the algorithm is good for SMP case (as we can't prevent the code in vdso from migrating between CPUs) I'd like to send v2 with some modifications to keep the discussion going. Changes since v1: - Document the TSC page reading protocol [Thomas Gleixner]. - Separate the TSC page reading code from

Hi, while we're still waiting for a definitive ACK from Microsoft that the algorithm is good for SMP case (as we can't prevent the code in vdso from migrating between CPUs) I'd like to send v2 with some modifications to keep the discussion going. Changes since v1: - Document the TSC page reading protocol [Thomas Gleixner]. - Separate the TSC page reading code from