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From: Paul Mackerras <paulus@samba.org>
To: Alexander Graf <agraf@suse.de>, kvm-ppc@vger.kernel.org
Cc: kvm@vger.kernel.org
Subject: [PATCH 11/18] KVM: PPC: Book3S PR: Correct errors in H_ENTER implementation
Date: Fri, 20 Sep 2013 14:52:47 +1000	[thread overview]
Message-ID: <1379652774-10106-12-git-send-email-paulus@samba.org> (raw)
In-Reply-To: <1379652774-10106-1-git-send-email-paulus@samba.org>

The implementation of H_ENTER in PR KVM has some errors:

* With H_EXACT not set, if the HPTEG is full, we return H_PTEG_FULL
  as the return value of kvmppc_h_pr_enter, but the caller is expecting
  one of the EMULATE_* values.  The H_PTEG_FULL needs to go in the
  guest's R3 instead.

* With H_EXACT set, if the selected HPTE is already valid, the H_ENTER
  call should return a H_PTEG_FULL error.

This fixes these errors and also makes it write only the selected HPTE,
not the whole group, since only the selected HPTE has been modified.
This also micro-optimizes the calculations involving pte_index and i.

Signed-off-by: Paul Mackerras <paulus@samba.org>
---
 arch/powerpc/kvm/book3s_pr_papr.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
index da0e0bc..38f1899 100644
--- a/arch/powerpc/kvm/book3s_pr_papr.c
+++ b/arch/powerpc/kvm/book3s_pr_papr.c
@@ -21,6 +21,8 @@
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
 
+#define HPTE_SIZE	16		/* bytes per HPT entry */
+
 static unsigned long get_pteg_addr(struct kvm_vcpu *vcpu, long pte_index)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
@@ -40,32 +42,39 @@ static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
 	long pte_index = kvmppc_get_gpr(vcpu, 5);
 	unsigned long pteg[2 * 8];
 	unsigned long pteg_addr, i, *hpte;
+	long int ret;
 
+	i = pte_index & 7;
 	pte_index &= ~7UL;
 	pteg_addr = get_pteg_addr(vcpu, pte_index);
 
 	copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg));
 	hpte = pteg;
 
+	ret = H_PTEG_FULL;
 	if (likely((flags & H_EXACT) == 0)) {
-		pte_index &= ~7UL;
 		for (i = 0; ; ++i) {
 			if (i == 8)
-				return H_PTEG_FULL;
+				goto done;
 			if ((*hpte & HPTE_V_VALID) == 0)
 				break;
 			hpte += 2;
 		}
 	} else {
-		i = kvmppc_get_gpr(vcpu, 5) & 7UL;
 		hpte += i * 2;
+		if (*hpte & HPTE_V_VALID)
+			goto done;
 	}
 
 	hpte[0] = kvmppc_get_gpr(vcpu, 6);
 	hpte[1] = kvmppc_get_gpr(vcpu, 7);
-	copy_to_user((void __user *)pteg_addr, pteg, sizeof(pteg));
-	kvmppc_set_gpr(vcpu, 3, H_SUCCESS);
+	pteg_addr += i * HPTE_SIZE;
+	copy_to_user((void __user *)pteg_addr, hpte, HPTE_SIZE);
 	kvmppc_set_gpr(vcpu, 4, pte_index | i);
+	ret = H_SUCCESS;
+
+ done:
+	kvmppc_set_gpr(vcpu, 3, ret);
 
 	return EMULATE_DONE;
 }
-- 
1.8.4.rc3


  parent reply	other threads:[~2013-09-20  4:53 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-20  4:52 [PATCH 00/18] KVM: PPC: Fixes for PR and preparation for POWER8 Paul Mackerras
2013-09-20  4:52 ` [PATCH 01/18] KVM: PPC: BookE: Add GET/SET_ONE_REG interface for VRSAVE Paul Mackerras
2013-09-20  4:52 ` [PATCH 02/18] KVM: PPC: Book3S HV: Store LPCR value for each virtual core Paul Mackerras
2013-09-20  4:52 ` [PATCH 03/18] KVM: PPC: Book3S HV: Add support for guest Program Priority Register Paul Mackerras
2013-09-20  4:52 ` [PATCH 04/18] KVM: PPC: Book3S HV: Support POWER6 compatibility mode on POWER7 Paul Mackerras
2013-09-21  4:33   ` Paul Mackerras
2013-09-21  4:35   ` [PATCH v2 " Paul Mackerras
2013-09-20  4:52 ` [PATCH 05/18] KVM: PPC: Book3S HV: Don't crash host on unknown guest interrupt Paul Mackerras
2013-09-20  4:52 ` [PATCH 06/18] KVM: PPC: Book3S PR: Fix compilation without CONFIG_ALTIVEC Paul Mackerras
2013-09-20  4:52 ` [PATCH 07/18] KVM: PPC: Book3S PR: Keep volatile reg values in vcpu rather than shadow_vcpu Paul Mackerras
2013-09-20  4:52 ` [PATCH 08/18] KVM: PPC: Book3S PR: Allow guest to use 64k pages Paul Mackerras
2013-09-20  4:52 ` [PATCH 09/18] KVM: PPC: Book3S PR: Use 64k host pages where possible Paul Mackerras
2013-09-20  4:52 ` [PATCH 10/18] KVM: PPC: Book3S PR: Handle PP0 page-protection bit in guest HPTEs Paul Mackerras
2013-09-20  4:52 ` Paul Mackerras [this message]
2013-09-20  4:52 ` [PATCH 12/18] KVM: PPC: Book3S PR: Make HPT accesses and updates SMP-safe Paul Mackerras
2013-09-20  4:52 ` [PATCH 13/18] KVM: PPC: Book3S PR: Allocate kvm_vcpu structs from kvm_vcpu_cache Paul Mackerras
2013-09-20  4:52 ` [PATCH 14/18] KVM: PPC: Book3S: Move skip-interrupt handlers to common code Paul Mackerras
2013-09-20  4:52 ` [PATCH 15/18] KVM: PPC: Book3S PR: Better handling of host-side read-only pages Paul Mackerras
2013-09-20  4:52 ` [PATCH 16/18] KVM: PPC: Book3S PR: Use mmu_notifier_retry() in kvmppc_mmu_map_page() Paul Mackerras
2013-09-20  4:52 ` [PATCH 17/18] KVM: PPC: Book3S PR: Mark pages accessed, and dirty if being written Paul Mackerras
2013-09-20  4:52 ` [PATCH 18/18] KVM: PPC: Book3S PR: Reduce number of shadow PTEs invalidated by MMU notifiers Paul Mackerras
2013-09-25 23:29 ` [PATCH 00/18] KVM: PPC: Fixes for PR and preparation for POWER8 Alexander Graf

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