From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: devel@linuxdriverproject.org, x86@kernel.org
Cc: linux-kernel@vger.kernel.org,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Steven Rostedt <rostedt@goodmis.org>,
Jork Loeser <Jork.Loeser@microsoft.com>,
Simon Xiao <sixiao@microsoft.com>,
Andy Lutomirski <luto@kernel.org>
Subject: [PATCH v4 04/10] x86/hyper-v: fast hypercall implementation
Date: Wed, 24 May 2017 14:03:59 +0200 [thread overview]
Message-ID: <20170524120405.19079-5-vkuznets@redhat.com> (raw)
In-Reply-To: <20170524120405.19079-1-vkuznets@redhat.com>
Hyper-V supports 'fast' hypercalls when all parameters are passed through
registers. Implement an inline version of a simpliest of these calls:
hypercall with one 8-byte input and no output.
Proper hypercall input interface (struct hv_hypercall_input) definition is
added as well.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Tested-by: Simon Xiao <sixiao@microsoft.com>
Tested-by: Srikanth Myakam <v-srm@microsoft.com>
---
Change since v3:
- Force stack frame in hv_do_fast_hypercall8() [Andy Lutomirski]
---
arch/x86/include/asm/mshyperv.h | 41 ++++++++++++++++++++++++++++++++++++++
arch/x86/include/uapi/asm/hyperv.h | 19 ++++++++++++++++++
2 files changed, 60 insertions(+)
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index cbbf7db..52b3611 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -217,6 +217,47 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
#endif /* !x86_64 */
}
+/* Fast hypercall with 8 bytes of input and no output */
+static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
+{
+ union hv_hypercall_input control = {0};
+ register void *__sp asm(_ASM_SP);
+
+ control.code = code;
+ control.fast = 1;
+#ifdef CONFIG_X86_64
+ {
+ u64 hv_status;
+
+ __asm__ __volatile__("call *%4"
+ : "=a" (hv_status), "+r" (__sp),
+ "+c" (control.as_uint64), "+d" (input1)
+ : "m" (hv_hypercall_pg)
+ : "cc", "r8", "r9", "r10", "r11");
+ return hv_status;
+ }
+#else
+ {
+ u32 hv_status_hi, hv_status_lo;
+ u32 input1_hi = (u32)(input1 >> 32);
+ u32 input1_lo = (u32)input1;
+
+ __asm__ __volatile__ ("call *%7"
+ : "=d"(hv_status_hi),
+ "=a"(hv_status_lo),
+ "+c"(input1_lo),
+ "+r"(__sp)
+ : "d" (control.as_uint32_hi),
+ "a" (control.as_uint32_lo),
+ "b" (input1_hi),
+ "m" (hv_hypercall_pg)
+ : "cc", "edi", "esi");
+
+ return hv_status_lo | ((u64)hv_status_hi << 32);
+ }
+#endif
+}
+
void hyperv_init(void);
void hyperv_report_panic(struct pt_regs *regs);
bool hv_is_hypercall_page_setup(void);
diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h
index 432df4b..c87e900 100644
--- a/arch/x86/include/uapi/asm/hyperv.h
+++ b/arch/x86/include/uapi/asm/hyperv.h
@@ -256,6 +256,25 @@
#define HV_PROCESSOR_POWER_STATE_C2 2
#define HV_PROCESSOR_POWER_STATE_C3 3
+/* Hypercall interface */
+union hv_hypercall_input {
+ u64 as_uint64;
+ struct {
+ __u32 as_uint32_lo;
+ __u32 as_uint32_hi;
+ };
+ struct {
+ __u64 code:16;
+ __u64 fast:1;
+ __u64 varhead_size:10;
+ __u64 reserved1:5;
+ __u64 rep_count:12;
+ __u64 reserved2:4;
+ __u64 rep_start:12;
+ __u64 reserved3:4;
+ };
+};
+
/* hypercall status code */
#define HV_STATUS_SUCCESS 0
#define HV_STATUS_INVALID_HYPERCALL_CODE 2
--
2.9.4
next prev parent reply other threads:[~2017-05-24 12:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-24 12:03 [PATCH v4 00/10] Hyper-V: praravirtualized remote TLB flushing and hypercall improvements Vitaly Kuznetsov
2017-05-24 12:03 ` [PATCH v4 01/10] x86/hyper-v: include hyperv/ only when CONFIG_HYPERV is set Vitaly Kuznetsov
2017-05-24 12:03 ` [PATCH v4 02/10] x86/hyper-v: stash the max number of virtual/logical processor Vitaly Kuznetsov
2017-05-27 17:43 ` Andy Shevchenko
2017-06-05 15:24 ` Steven Rostedt
2017-06-05 15:30 ` Stephen Hemminger
2017-05-24 12:03 ` [PATCH v4 03/10] x86/hyper-v: make hv_do_hypercall() inline Vitaly Kuznetsov
2017-05-27 17:46 ` Andy Shevchenko
2017-05-24 12:03 ` Vitaly Kuznetsov [this message]
2017-05-27 17:49 ` [PATCH v4 04/10] x86/hyper-v: fast hypercall implementation Andy Shevchenko
2017-05-24 12:04 ` [PATCH v4 05/10] hyper-v: use fast hypercall for HVCALL_SIGNAL_EVENT Vitaly Kuznetsov
2017-05-27 17:50 ` Andy Shevchenko
2017-05-24 12:04 ` [PATCH v4 06/10] x86/hyper-v: implement rep hypercalls Vitaly Kuznetsov
2017-05-24 12:04 ` [PATCH v4 07/10] hyper-v: globalize vp_index Vitaly Kuznetsov
2017-05-24 12:04 ` [PATCH v4 08/10] x86/hyper-v: use hypercall for remote TLB flush Vitaly Kuznetsov
2017-05-24 12:04 ` [PATCH v4 09/10] x86/hyper-v: support extended CPU ranges for TLB flush hypercalls Vitaly Kuznetsov
2017-05-27 18:13 ` Andy Shevchenko
2017-05-24 12:04 ` [PATCH v4 10/10] tracing/hyper-v: trace hyperv_mmu_flush_tlb_others() Vitaly Kuznetsov
2017-06-05 15:50 ` Steven Rostedt
2017-06-05 16:19 ` Vitaly Kuznetsov
2017-06-07 13:52 ` Steven Rostedt
2017-06-07 14:03 ` Vitaly Kuznetsov
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=20170524120405.19079-5-vkuznets@redhat.com \
--to=vkuznets@redhat.com \
--cc=Jork.Loeser@microsoft.com \
--cc=devel@linuxdriverproject.org \
--cc=haiyangz@microsoft.com \
--cc=hpa@zytor.com \
--cc=kys@microsoft.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mingo@redhat.com \
--cc=rostedt@goodmis.org \
--cc=sixiao@microsoft.com \
--cc=sthemmin@microsoft.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).