Commit d5394c05 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Michael Ellerman

powerpc/pseries/svm: Use shared memory for Debug Trace Log (DTL)

Secure guests need to share the DTL buffers with the hypervisor. To that
end, use a kmem_cache constructor which converts the underlying buddy
allocated SLUB cache pages into shared memory.
Signed-off-by: default avatarAnshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: default avatarThiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820021326.6884-10-bauerman@linux.ibm.com
parent bd104e6d
...@@ -15,6 +15,9 @@ static inline bool is_secure_guest(void) ...@@ -15,6 +15,9 @@ static inline bool is_secure_guest(void)
return mfmsr() & MSR_S; return mfmsr() & MSR_S;
} }
void dtl_cache_ctor(void *addr);
#define get_dtl_cache_ctor() (is_secure_guest() ? dtl_cache_ctor : NULL)
#else /* CONFIG_PPC_SVM */ #else /* CONFIG_PPC_SVM */
static inline bool is_secure_guest(void) static inline bool is_secure_guest(void)
...@@ -22,5 +25,7 @@ static inline bool is_secure_guest(void) ...@@ -22,5 +25,7 @@ static inline bool is_secure_guest(void)
return false; return false;
} }
#define get_dtl_cache_ctor() NULL
#endif /* CONFIG_PPC_SVM */ #endif /* CONFIG_PPC_SVM */
#endif /* _ASM_POWERPC_SVM_H */ #endif /* _ASM_POWERPC_SVM_H */
...@@ -26,6 +26,7 @@ obj-$(CONFIG_IBMVIO) += vio.o ...@@ -26,6 +26,7 @@ obj-$(CONFIG_IBMVIO) += vio.o
obj-$(CONFIG_IBMEBUS) += ibmebus.o obj-$(CONFIG_IBMEBUS) += ibmebus.o
obj-$(CONFIG_PAPR_SCM) += papr_scm.o obj-$(CONFIG_PAPR_SCM) += papr_scm.o
obj-$(CONFIG_PPC_SPLPAR) += vphn.o obj-$(CONFIG_PPC_SPLPAR) += vphn.o
obj-$(CONFIG_PPC_SVM) += svm.o
ifdef CONFIG_PPC_PSERIES ifdef CONFIG_PPC_PSERIES
obj-$(CONFIG_SUSPEND) += suspend.o obj-$(CONFIG_SUSPEND) += suspend.o
......
...@@ -69,6 +69,7 @@ ...@@ -69,6 +69,7 @@
#include <asm/security_features.h> #include <asm/security_features.h>
#include <asm/asm-const.h> #include <asm/asm-const.h>
#include <asm/swiotlb.h> #include <asm/swiotlb.h>
#include <asm/svm.h>
#include "pseries.h" #include "pseries.h"
#include "../../../../drivers/pci/pci.h" #include "../../../../drivers/pci/pci.h"
...@@ -297,8 +298,10 @@ static inline int alloc_dispatch_logs(void) ...@@ -297,8 +298,10 @@ static inline int alloc_dispatch_logs(void)
static int alloc_dispatch_log_kmem_cache(void) static int alloc_dispatch_log_kmem_cache(void)
{ {
void (*ctor)(void *) = get_dtl_cache_ctor();
dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
DISPATCH_LOG_BYTES, 0, NULL); DISPATCH_LOG_BYTES, 0, ctor);
if (!dtl_cache) { if (!dtl_cache) {
pr_warn("Failed to create dispatch trace log buffer cache\n"); pr_warn("Failed to create dispatch trace log buffer cache\n");
pr_warn("Stolen time statistics will be unreliable\n"); pr_warn("Stolen time statistics will be unreliable\n");
......
// SPDX-License-Identifier: GPL-2.0+
/*
* Secure VM platform
*
* Copyright 2018 IBM Corporation
* Author: Anshuman Khandual <khandual@linux.vnet.ibm.com>
*/
#include <linux/mm.h>
#include <asm/ultravisor.h>
/* There's one dispatch log per CPU. */
#define NR_DTL_PAGE (DISPATCH_LOG_BYTES * CONFIG_NR_CPUS / PAGE_SIZE)
static struct page *dtl_page_store[NR_DTL_PAGE];
static long dtl_nr_pages;
static bool is_dtl_page_shared(struct page *page)
{
long i;
for (i = 0; i < dtl_nr_pages; i++)
if (dtl_page_store[i] == page)
return true;
return false;
}
void dtl_cache_ctor(void *addr)
{
unsigned long pfn = PHYS_PFN(__pa(addr));
struct page *page = pfn_to_page(pfn);
if (!is_dtl_page_shared(page)) {
dtl_page_store[dtl_nr_pages] = page;
dtl_nr_pages++;
WARN_ON(dtl_nr_pages >= NR_DTL_PAGE);
uv_share_page(pfn, 1);
}
}
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