lkml.org 
[lkml]   [2020]   [Feb]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 47/62] x86/sev-es: Handle RDTSCP Events
Date
From: Joerg Roedel <jroedel@suse.de>

Extend the RDTSC handler to also handle RDTSCP events.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/kernel/sev-es.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 485f5a14c3b4..d5a14f277adb 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -272,19 +272,24 @@ static enum es_result handle_wbinvd(struct ghcb *ghcb,
return ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0);
}

-static enum es_result handle_rdtsc(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
+static enum es_result handle_rdtsc(struct ghcb *ghcb, struct es_em_ctxt *ctxt,
+ unsigned long exit_code)
{
+ bool rdtscp = (exit_code == SVM_EXIT_RDTSCP);
enum es_result ret;

- ret = ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDTSC, 0, 0);
+ ret = ghcb_hv_call(ghcb, ctxt, exit_code, 0, 0);
if (ret != ES_OK)
return ret;

- if (!(ghcb_is_valid_rax(ghcb) && ghcb_is_valid_rdx(ghcb)))
+ if (!(ghcb_is_valid_rax(ghcb) && ghcb_is_valid_rdx(ghcb) &&
+ (!rdtscp || ghcb_is_valid_rcx(ghcb))))
return ES_VMM_ERROR;

ctxt->regs->ax = ghcb->save.rax;
ctxt->regs->dx = ghcb->save.rdx;
+ if (rdtscp)
+ ctxt->regs->cx = ghcb->save.rcx;

return ES_OK;
}
@@ -328,7 +333,8 @@ static enum es_result handle_vc_exception(struct es_em_ctxt *ctxt,
result = handle_dr7_write(ghcb, ctxt, early);
break;
case SVM_EXIT_RDTSC:
- result = handle_rdtsc(ghcb, ctxt);
+ case SVM_EXIT_RDTSCP:
+ result = handle_rdtsc(ghcb, ctxt, exit_code);
break;
case SVM_EXIT_RDPMC:
result = handle_rdpmc(ghcb, ctxt);
--
2.17.1
\
 
 \ /
  Last update: 2020-02-11 14:55    [W:0.458 / U:1.320 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site