All of lore.kernel.org
 help / color / mirror / Atom feed
From: Fabiano Rosas <farosas@linux.ibm.com>
To: Nicholas Piggin <npiggin@gmail.com>, qemu-ppc@nongnu.org
Cc: qemu-devel@nongnu.org, "Nicholas Piggin" <npiggin@gmail.com>,
	"Cédric Le Goater" <clg@kaod.org>
Subject: Re: [PATCH 9/9] spapr: implement nested-hv capability for the virtual hypervisor
Date: Tue, 15 Feb 2022 13:01:38 -0300	[thread overview]
Message-ID: <87mtisxgnx.fsf@linux.ibm.com> (raw)
In-Reply-To: <20220215031642.1691873-10-npiggin@gmail.com>

Nicholas Piggin <npiggin@gmail.com> writes:

> This implements the Nested KVM HV hcall API for spapr under TCG.
>
> The L2 is switched in when the H_ENTER_NESTED hcall is made, and the
> L1 is switched back in returned from the hcall when a HV exception
> is sent to the vhyp. Register state is copied in and out according to
> the nested KVM HV hcall API specification.
>
> The hdecr timer is started when the L2 is switched in, and it provides
> the HDEC / 0x980 return to L1.
>
> The MMU re-uses the bare metal radix 2-level page table walker by
> using the get_pate method to point the MMU to the nested partition
> table entry. MMU faults due to partition scope errors raise HV
> exceptions and accordingly are routed back to the L1.
>
> The MMU does not tag translations for the L1 (direct) vs L2 (nested)
> guests, so the TLB is flushed on any L1<->L2 transition (hcall entry
> and exit).
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>


  reply	other threads:[~2022-02-15 16:02 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-15  3:16 [PATCH 0/9] ppc: nested KVM HV for spapr virtual hypervisor Nicholas Piggin
2022-02-15  3:16 ` [PATCH 1/9] target/ppc: raise HV interrupts for partition table entry problems Nicholas Piggin
2022-02-15  8:29   ` Cédric Le Goater
2022-02-15  3:16 ` [PATCH 2/9] spapr: prevent hdec timer being set up under virtual hypervisor Nicholas Piggin
2022-02-15 18:34   ` Cédric Le Goater
2022-02-15  3:16 ` [PATCH 3/9] ppc: allow the hdecr timer to be created/destroyed Nicholas Piggin
2022-02-15 18:36   ` Cédric Le Goater
2022-02-16  0:36     ` Nicholas Piggin
2022-02-15  3:16 ` [PATCH 4/9] target/ppc: add vhyp addressing mode helper for radix MMU Nicholas Piggin
2022-02-15 10:01   ` Cédric Le Goater
2022-02-15  3:16 ` [PATCH 5/9] target/ppc: make vhyp get_pate method take lpid and return success Nicholas Piggin
2022-02-15 10:03   ` Cédric Le Goater
2022-02-15  3:16 ` [PATCH 6/9] target/ppc: add helper for books vhyp hypercall handler Nicholas Piggin
2022-02-15 10:04   ` Cédric Le Goater
2022-02-15  3:16 ` [PATCH 7/9] target/ppc: Add powerpc_reset_excp_state helper Nicholas Piggin
2022-02-15 10:04   ` Cédric Le Goater
2022-02-15  3:16 ` [PATCH 8/9] target/ppc: Introduce a vhyp framework for nested HV support Nicholas Piggin
2022-02-15 15:59   ` Fabiano Rosas
2022-02-15 17:28   ` Cédric Le Goater
2022-02-15 19:19     ` BALATON Zoltan
2022-02-16  0:49       ` Nicholas Piggin
2022-02-15  3:16 ` [PATCH 9/9] spapr: implement nested-hv capability for the virtual hypervisor Nicholas Piggin
2022-02-15 16:01   ` Fabiano Rosas [this message]
2022-02-15 18:21   ` Cédric Le Goater
2022-02-16  1:16     ` Nicholas Piggin
2022-02-16 10:23       ` Cédric Le Goater
2022-02-15 18:33 ` [PATCH 0/9] ppc: nested KVM HV for spapr " Cédric Le Goater
2022-02-15 18:45   ` Daniel Henrique Barboza
2022-02-15 19:20     ` Fabiano Rosas
2022-02-16  9:09       ` Nicholas Piggin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87mtisxgnx.fsf@linux.ibm.com \
    --to=farosas@linux.ibm.com \
    --cc=clg@kaod.org \
    --cc=npiggin@gmail.com \
    --cc=qemu-devel@nongnu.org \
    --cc=qemu-ppc@nongnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.